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Summary: In this study, the effects of Si/Al ratio, temperature, relative humidity, and feed gas compositions on NOx sorption behavior on HZSM-5 zeolites were investigated. The results showed that HZSM-5(25) with low silica exhibited the best performance in NOx adsorption. Oxygen enhanced NOx adsorption, while carbon dioxide had little effect. Lower temperature increased NOx adsorption capacity on HZSM-5(25) due to NO2 physisorption and satisfactory NO oxidation. The study also revealed a potential water-resistant strategy for NOx adsorbents.
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Yafei Shen
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Yuzhi Zhou et al.
Summary: It is important to develop efficient composite photocatalysts and understand the electron transfer mechanism in photocatalytic hydrogen evolution. In this study, a novel composite nanoarchitectonics (Cu2O@TiO2@ZIF-8) with double-shell heterojunctions was constructed by coating zeolite imidazolate framework-8 (ZIF-8) shell on the outer surface of core-shell Cu2O/ TiO2 heterojunction. The nanoarchitectonics showed higher photocatalytic activity and stability for hydrogen evolution compared to similar systems, without loading any cocatalysts. The research demonstrated the effective suppression of electron-hole recombination and the synergistic effect between Cu2O@TiO2 and ZIF-8 in improving electron transfer and photocatalytic activity.
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Summary: The catalytic conversion of biomass into valuable biochemicals and biofuels using zeolites as heterogeneous catalysts is a promising strategy for biomass utilization. This review provides an overview of recent advances in zeolite-catalyzed conversion of biomass to levulinic acid (LA) and 5-hydroxymethylfurfural (HMF). It also summarizes the production of valuable derivatives from LA and HMF over zeolite.
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Hongfei Ma et al.
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Lianyun Gao et al.
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CHEMICAL ENGINEERING JOURNAL
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Sheng Wei et al.
Summary: Using BEA (Si/Al = 20) zeolite and dealuminated Si-BEA as supports, non-noble metal Co catalysts were prepared to investigate the relationship between catalyst structure and catalytic performance in propane dehydrogenation (PDH) reaction. The optimized 0.5 wt% Co@Si-BEA catalyst showed over 93% selectivity to propylene, high single-pass yield, and excellent regeneration stability at 590 degrees C. The catalyst contained isolated Co2+ cations anchored in the micropores of Si-BEA zeolites, serving as active sites to selectively activate C-H bonds of propane and leading to high propylene selectivity, activity, and long-term stability in PDH reaction.
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W. Dai et al.
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Summary: Emission plays a crucial role in air pollution and its impact on living organisms. Selective Catalytic Reduction (SCR) is a commonly used technology to reduce Nitrogen Oxides (NOx) emissions in internal combustion engines. This review examines various catalysts used in SCR, including metal-based catalysts and zeolite-based catalysts, and explores their performance and characteristics in terms of GHSV, efficiency at different temperature ranges, percentage doping, and NOx conversion efficiency. The review concludes that zeolite catalysts show excellent deNOx efficiency, with 2 to 4 wt% doping of Cu achieving around 95% deNOx and doping of Fe widening the operating temperature range.
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Li Zhang et al.
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Daiqiang Li et al.
Summary: In this study, regulation of active sites in zeolites with different Si/Al ratios was used to achieve Pt/Beta catalysts with different valence states, locations, and dispersion of Pt for toluene oxidation. The Pt/Beta catalysts with high silica showed better catalytic oxidation performance than those with low silica, due to the stronger activation ability towards O2 and more facile oxygen replenishment of Pt0. Moreover, Pt0 was found to be more conducive to the benzene ring opening reaction.
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Yuanyuan Zhang et al.
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Pengkai Jin et al.
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Rui Feng et al.
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Jie Tuo et al.
Summary: A Mn-modified ZSM-5 zeolite was successfully synthesized and characterized, showing an increase in weak acid sites and a decrease in strong acid sites with the introduction of Mn. The modified zeolite exhibited higher selectivity and catalyst lifetime during the methanol-to-propylene reaction.
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Hongwei Zhang et al.
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Lina Zhang et al.
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Fu Yang et al.
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Rui Feng et al.
Summary: HZSM-5 zeolites were synthesized using ammonia hydroxide as a substitute alkaline source, which eliminated the need for multiple ion exchanges. Ammonia hydroxide had limited impact on crystallinity and morphology, while silicon and aluminum sources significantly affected morphology and aluminum distribution. Acid properties and aluminum distribution played a crucial role in the methanol-to-propylene reaction, with higher SiO2/Al2O3 ratios leading to improved selectivity.
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Hyun June Choi et al.
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Qingjun Yu et al.
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CHINESE CHEMICAL LETTERS
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Mingqiang Chen et al.
Summary: The study focuses on improving the catalytic performance of methanol steam reforming (MSR) by supporting Cu-Zr components on AZ, which enhances the catalytic activity and promotes efficient hydrogen production.
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Rui Wu et al.
Summary: This study synthesized zeolite for asphalt VOCs reduction using red mud and steel slag, and discussed its performance through the study of optimized synthesis conditions. The research results showed that the optimized zeolite can effectively reduce the VOC content in asphalt materials.
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Neda Kalantari et al.
Summary: In this study, chromium and boron were introduced into the hierarchical structure of ZSM-5 to enhance the catalysts' performance in the methanol-to-propylene process. The crystal structure and orientation of the synthesized zeolites were analyzed, revealing that the introduction of chromium and boron resulted in changes in the crystallinity and symmetry of the zeolites. The impregnated chromium-ZSM-5 catalyst showed superior performance in the production of light olefins, while the introduction of boron further improved the propylene selectivity and ratio.
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Tao Yin et al.
Summary: In this study, metal-oxide nanoparticles were efficiently loaded on NaY zeolite using the evaporation induced self-assembly (EISA) method to enhance adsorption capacity for VOCs. Among the different composites tested, Y@CoO showed optimal adsorption performance for isopropanol and acetone, while Y@MnO2 exhibited the best adsorption capacity for toluene. The chemisorption of metal-oxides with VOCs oxygen functional groups significantly improved the adsorption capacity, suggesting a new approach for developing advanced adsorbents for VOCs.
SEPARATION AND PURIFICATION TECHNOLOGY
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Puxiang Yan et al.
Summary: Efficient conversion of furfural alcohol to levulinic acid was achieved using hierarchical ZSM-5 zeolite (ZSM-5-OH0.2-H) with improved adsorption capacity and acid accessibility. This study provides an effective strategy to enhance the catalytic performance of biomass valorization, which is of great significance for achieving sustainable utilization of biomass.
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Ge Yang et al.
Summary: In recent years, Ga-based catalysts have gained much attention in propane dehydrogenation (PDH) reactions due to their environmental friendly nature and low cost. However, achieving high propylene selectivity under harsh reaction conditions remains a challenge. In this study, supported catalysts (Ga-xMg/ZSM-5) were prepared using the sequential impregnation method and applied in the PDH reaction. The results show that the addition of MgO reduces the acidity of the catalysts, promotes the dispersion of Ga2O3, and improves the selectivity of propylene.
APPLIED CATALYSIS A-GENERAL
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K. Magrini et al.
Summary: NREL's research focuses on upgrading biomass fast-pyrolysis vapors through ex-situ methods to produce fuel precursors, fuels, and chemicals. Their work demonstrates the feasibility of producing refinery-compatible hydrocarbon fuel intermediates from biomass-derived vapors, as well as the use of these upgraded oils in FCC refinery operations to produce biogenic carbon-containing fuels.
BIOMASS & BIOENERGY
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Ran Zhang et al.
Summary: In this study, ZSM-5 zeolite supported metal catalysts were developed for hydro-upgrading FCC gasoline, which effectively reduced olefin content and increased the content of aromatics and iso-alkanes, resulting in improved research octane number (RON).
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Engineering, Environmental
Huijuan Liu et al.
Summary: In this study, core-shell composites of NaY zeolite coated with mesoporous SiO2 were synthesized to improve the hydrophobicity and mass diffusion of the zeolite. The results showed that the composites exhibited enhanced adsorption capacity and diffusion of volatile organic compounds (VOCs). The coating of NaY zeolite with mesoporous SiO2 promoted the diffusion of VOCs into the composites, and the NaY@meso-SiO2-1.2 composite showed the strongest adsorption ability and excellent hydrophobicity at RH = 50%.
CHEMICAL ENGINEERING JOURNAL
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Aihu Feng et al.
Summary: This study successfully prepared hierarchical USY zeolites with size-controlled mesopores and demonstrated their excellent adsorption properties for VOCs molecules.
CHEMICAL PHYSICS LETTERS
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Lihui Yu et al.
Summary: In this study, the supercritical water gasification of dealkaline lignin catalyzed by different zeolite-supported Ni catalysts was investigated. The catalysts, except Ni/ZSM-5, enhanced the gasification, with the highest activity observed for Ni/4A. Ni/4A had mesopores of suitable size for Ni dispersion and provided more active sites. The use of Ni/4A improved the gasification efficiency and hydrogen production, but the effect diminished after 20 min of reaction time.
Article
Chemistry, Applied
Ammaru Ismaila et al.
Summary: This study investigates the valorization of crude glycerol via steam reforming (SRG) using encapsulated Ni catalyst in siliceous silicalite-1 zeolite (Ni@Si-1). The results show that the encapsulated Ni catalyst exhibits improved performance and enhanced anti-deactivation potentials compared to conventional impregnated Ni catalysts. The post-synthetic treatment of Ni@Si-1 forms the encapsulated Ni catalyst with a mesoporous hollow structure (Ni@HolSi-1), which demonstrates even better performance in SRG. The findings highlight the potential of the encapsulation strategy and mesoporous zeolites for developing future reforming catalysts.
FUEL PROCESSING TECHNOLOGY
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Muhammad Anif Abu Zarin et al.
Summary: This study investigated the feasibility of a series of HY zeolite immobilized ionic liquid catalysts for the conversion of glucose to levulinic acid. The results showed that the catalysts exhibited high catalytic performance under mild conditions. Additionally, the conversion of other biomass derivatives was explored, and comparable levulinic acid yields were obtained from oil palm frond and empty fruit bunch.
MOLECULAR CATALYSIS
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Chemistry, Physical
Cafer SAKA
APPLIED CATALYSIS B-ENVIRONMENTAL
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Minghui Zhong et al.
Summary: This study develops a unique solar driven catalysis system for converting cellulose into lactic acid using Cu modified natural palygorskite catalyst. The incorporation of Cu reframes the properties of palygorskite and reduces the band gap. Cu2O quantum dots assemble on the Cu-Pal surface to form a heterostructure, enhancing charge transfer and providing abundant adsorption sites. The 10 wt% Cu2O QDs/Cu-Pal nanocomposite exhibits remarkable photocatalytic selectivity for lactic acid production under visible light.
APPLIED CATALYSIS B-ENVIRONMENTAL
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Article
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Ying Xiong et al.
Summary: Researchers have developed a silver-exchanged zeolite Y as an adsorbent for propylene/propane separation, which exhibits high selectivity, fast kinetics, and reversible sorption. The design strategy of enhancing sorption site affinity and maintaining pore size can be extended to other adsorbents, promoting the deployment of adsorption technology for propylene/propane separation.
CHEMICAL ENGINEERING JOURNAL
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Article
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Shuangchun Lu et al.
Summary: This study reports on the synthesis of binder-free monolithic zeolite pellets with robust mechanical strength and high water tolerance using a citric acid sacrifice strategy. The pellets have a large specific surface area and mesopore volume, and exhibit excellent adsorption capacity for VOCs even under humid conditions.
CHEMICAL ENGINEERING JOURNAL
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Article
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Fanzhe Kong et al.
Summary: A group of Pt/ZSM-5 catalysts with different SiO2/Al2O3 molar ratios were prepared and their catalytic activities for various VOCs were evaluated. The Pt/ZSM-5(46) catalyst showed the highest activity for n-hexane and benzene oxidation, while Pt/ZSM-5(25) catalyst exhibited the highest activity for oxygen/nitrogen-containing VOCs oxidation due to the presence of acid sites.
APPLIED SURFACE SCIENCE
(2022)
Review
Agricultural Engineering
Ranjeet Kumar Mishra et al.
Summary: This study focuses on investigating the shape selectivity, porosity, structure, and acidity of zeolites and their impact on bio-oil and chemicals production. Pore size, structure, Si/Al ratio, channel structure, and acidity are crucial parameters for aromatics production and deoxygenation reactions. Understanding the properties of zeolites is essential for enhancing the fundamental understanding of pyrolysis.
BIORESOURCE TECHNOLOGY
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Article
Chemistry, Applied
Wenhao Cui et al.
Summary: Mesoporous high-silica zeolite Y, with improved accessibility of acid sites and mass transport properties, is a highly desired catalytic material for various industries. Its direct synthesis, named MSY, exhibits excellent catalytic cracking performance and thermal stability. The MSY-based catalyst demonstrates enhanced conversion and gasoline yield in cracking reactions compared to commercial ultra-stable Y and mesoporogen-free counterparts.
CHINESE JOURNAL OF CATALYSIS
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Article
Engineering, Environmental
Cheng Zhao et al.
Summary: By hydrothermally synthesizing spherical and hierarchical ZSM-5 zeolite with organo-functionalized silica and organic additive, nanocrystalline stacking and hierarchical meso-microporous architectures were achieved. The size of nanocrystals and surface topography of ZSM-5 were influenced by the organo-functionalized silica and organic additive, allowing control of the mesoporous volumes and pore diameter. Evaluation of performance in toluene showed high adsorption ability and excellent cyclic performance due to lower steric limitations and higher diffusion rate for organic molecules. Exploration using Fourier Transform Infrared Spectroscopy and Differential Thermogravimetric Analysis directly confirmed the presence of organosilane and organic additives in the zeolitic nanocrystals, leading to the proposal of a crystallization mechanism significant for designing and synthesizing hierarchical zeolites.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
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Hiroshi Yamazaki et al.
Summary: The study found that the FCC catalyst with Al ion-exchanged USY zeolite increased LPG yield without decreasing activity, suppressed hydrogen transfer reactions, and over-cracked olefins in gasoline to LPG due to the strong acidity of Al ion-exchanged USY.
CATALYSIS COMMUNICATIONS
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Article
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Peipei Miao et al.
Summary: The study demonstrated that benzene as an additive can enhance the reactivity and product yield of alkyl-benzene and alkyl-naphthalene in LLCO during catalytic cracking. Furthermore, mesoporous BEA zeolite was identified as the optimal catalyst with the highest yield of value-added products.
Review
Green & Sustainable Science & Technology
Hwai Chyuan Ong et al.
Summary: Torrefaction technology, a thermal pretreatment for biomass, has been gaining attention for its upgrading performance, improving the quality of syngas and bio-oil. This study reviews recent advances in understanding the impact of torrefaction on biomass structure, analyzing thermal degradation characteristics of different biomass components. Future challenges and perspectives in biomass torrefaction for sustainable biofuel production are also highlighted.
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Materials Science, Multidisciplinary
Tian Wang et al.
Summary: An effective method involving sulfuric acid immersion and ultrasonically assisted acid leaching is proposed to efficiently remove harmful metals from spent FCC catalysts while maintaining their microstructure integrity. Experimental results demonstrate that this method not only restores pore structure and increases specific surface area, but also achieves high removal rates of harmful metals with reduced processing time compared to conventional methods.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
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Article
Green & Sustainable Science & Technology
Le-Phuc Nguyen et al.
Summary: This study investigates the conversion of high acid value waste cooking oils into biofuels using spent fluid catalytic cracking catalysts. The results show that at temperatures above 480 degrees C, WCO with a AV range of 6-22 mgKOH/g can be converted to liquid fuels with near-zero AV. The presence of ZSM-5 in the SFCC catalyst increases propylene and LPG yields, while higher rare earth content limits zeolite destruction and improves catalytic cracking activity.
Article
Chemistry, Physical
Juan Ye et al.
Summary: Yttrium-modified siliceous Beta zeolites catalyst was developed to efficiently convert cellulose to lactic acid with a yield of 49.2% within 30 minutes, under conditions of 220°C and 2 MPa N2. The dealumination and modification of Y were found to effectively modulate the acidity on the zeolite surface, leading to increased Lewis acidity and suppressed formation of dehydration products.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Physical
Shiyao Wang et al.
Summary: This paper studied the H-2 production via the steam reforming of a bioresource-derived ethanol mixture over supported Ca-modified Ni-hierarchical Beta zeolite catalysts. The hierarchical Beta zeolite with rich pore structure could be synthesized in one step by using a new quaternary ammonium gemini cationic surfactant. The support plays a key role for the improvement of catalytic behavior, and introducing calcium and nickel ions can change the internal structure of the catalyst.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Applied
Pusheng Liu et al.
Summary: Y3+-exchanged zeolite Y was prepared and the location of Y3+ ions was determined near the D6R's. The substitution of Y3+ ions for Na+ caused a noticeable shrinkage of the unit cell, leading to improved stability and selectivity in the FCC catalyst.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
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Summary: This study investigated the guaiacol adsorption capacity of different Y zeolites with various physicochemical properties. The results showed that the number of acid sites in the zeolites was positively correlated with the adsorption of guaiacol. Additionally, mesoporous structures were found to increase the diffusion rate of guaiacol inside the zeolite, leading to higher adsorption capacity.
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