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Article
Chemistry, Physical
Rajat Ghalta et al.
Summary: The production of benzaldehyde by toluene oxidation with O-2 is of great importance in chemical industries. A metal-free g-C3N4 nanosheet photocatalyst was reported for the selective production of benzaldehyde. The efficiency of g-C3N4 was enhanced by increasing the surface area and incorporating carbon vacancies through a simple thermal treatment. The catalyst exhibited excellent activity and selectivity, and could convert toluene derivatives and aromatic compounds to aldehydes or ketones with high yields.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Rohan Singh Pal et al.
Summary: This study investigated the effect of different alkaline earth metals doped La2-xMxCe2O7-delta (M = Ca, Sr, Ba and x = 0.30) catalysts prepared by one-step hydrothermal method for the low-temperature methane oxidative coupling (OCM) to olefins. The presence of a disordered cubic fluorite phase of synthesized catalysts was detected by powder XRD and Raman analysis. Surface analysis by XPS and Raman showed the presence of oxygen vacancy sites, which are responsible for the formation of electrophilic superoxide O-2(-) species in the presence of molecular oxygen. The catalytic activity of different catalysts for the OCM reactions follows the order: La1.7Ca0.3Ce2O7-delta > La1(.7)Sr(0.3)Ce(2)O(7-delta) > La1.7Ba0.3Ce2O7-delta > La2Ce2O7. The reactivity order follows the same trend as the amount of basic sites and reactive oxygen species. According to this study, the best catalyst is La1.7Ca0.3Ce2O7-delta, which gives the highest C-2 yield and C-2 selectivity of 23.6% and 78.8%, respectively, at 650 degrees C. DFT studies revealed that substitution of La by Ca in the La2Ce2O7 catalyst significantly reduces the oxygen vacancy formation energy by about 100 kJ/mol compared to the undoped LaCe-oxide. We believe that the superior activity of La1.7Ca0.3Ce2O7-delta catalyst is attributed to the higher amount of basicity and electrophilic oxygen content, which are the governing factors in OCM for CH4 conversion and C-2 product selectivity as well.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Hao Wang et al.
Summary: In this study, a photocatalyst constructed with a small amount of amorphous BiOCl nanosheets assembled on TiO2 showed excellent performance in toluene oxidation to benzaldehyde. The selectivity reached 85% at 10% conversion, and the benzaldehyde formation rate was significantly higher than that of bare TiO2 and BOC. The microstructure based on heterojunctions and the presence of surface oxygen vacancies in the amorphous BiOCl were found to be crucial for the high selectivity and performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Qi Li et al.
Summary: This study found that reactive oxygen species have a significant impact on the intermediates of toluene mineralization. SnO2 and TixSn1_xO2 infinite solid solution photocatalysts were prepared and the mineralization ability of Ti0.1Sn0.9O2 was found to be 2.7 times higher than that of SnO2. Introducing Ti shifted the conduction band position upward, allowing for the formation of superoxide radicals. SnO2 solely produced hydroxyl radicals, resulting in the generation of benzyl alcohol; while TixSn1_xO2 produced both hydroxyl radicals and superoxide radicals, leading to the formation of benzoic acid. Theoretical calculations confirmed that benzoic acid has a lower ring opening barrier, thereby enhancing the toluene mineralization ability of TixSn1_xO2. The synergistic roles of Ti and Sn in the adsorption and activation of water and toluene molecules are also proposed. This work provides new insights into the regulation of reactive oxygen radicals to modify intermediates and facilitate toluene removal.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Sonu Bhandari et al.
Summary: The challenge for heterogeneous catalysis is to develop robust catalysts that can activate molecular oxygen from air and selectively oxidize cyclohexane without producing unwanted by-products or leaching metal. In this study, we synthesized a nanosized CoWO4@W18O49 catalyst with oxygen vacancy sites, which achieved-24% cyclohexane conversion with-93% KA oil selectivity under solvent-free conditions. DFT studies showed that the CoWO4@W18O49 surface required -15.8 kJ/mol of energy for oxygen vacancy generation, significantly lower than the CoWO4 (111) and W18O49 (010) surfaces. The exceptional catalytic activity of CoWO4@W18O49 is attributed to the active CoWO4 and W18O49 interfaces, which have redox sites and abundant vacancies of oxygen.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Rohan Singh Pal et al.
Summary: This study developed an efficient and stable Li/MgO catalyst for the oxidative conversion of methane to olefins using a successive deposition-sublimation method. Compared to catalysts prepared by only deposition method, the catalyst prepared by deposition-sublimation method showed higher methane conversion and ethylene selectivity.
Article
Chemistry, Multidisciplinary
Ting Wang et al.
Summary: This study designs and constructs a Cu delta+/CeO2-TiO2 photocatalyst, which effectively converts CO2 into C-2 product through the synergistic effect of engineered catalytic interfaces and multiple active sites, and reveals the photocatalytic mechanism.
Article
Chemistry, Physical
Mingchuang Shen et al.
Summary: Ultrathin Bi4Ti3O12 nanosheets with a thickness of about 3.9 nm were successfully synthesized and used as a photocatalyst for the oxidation of benzyl alcohol. The nanosheets exhibited a photocatalytic performance about 8 times higher than that of bulk Bi4Ti3O12. The enhanced performance was attributed to the presence of more surface Lewis acid sites for adsorption and activation of benzyl alcohol, as well as the efficient utilization of photogenerated electrons and holes to produce radicals.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Feilong Gong et al.
Summary: This study successfully prepared a novel efficient WO3-based hydrogen evolution reaction catalyst, which exhibited outstanding performance in neutral media and showed higher activity compared to commercial Pt/C.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Nanoscience & Nanotechnology
Manju Kumari Jaiswal et al.
Summary: This study reports the hydrothermal fabrication of hydrated hexagonal/orthorhombic mixed-phase WO3 core.shell nanoribbons for the photodegradation of methylene blue. The mixed-phase core.shell exhibits 2.3 times higher photocatalytic activity than monoclinic and hexagonal crystalline phases. Intercalated water, trap states, and prolonged carrier lifetimes play significant roles in enhancing the photocatalytic performance of the hydrated mixed phase.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Martina Sciarretta et al.
Summary: This study presents the immobilization of TiO2 nanoparticles on graphene acid (GA) and investigates the resulting material's photocatalytic activity in the synthesis of 1,3,4-oxadiazoles. The GA-TiO2 composite exhibits enhanced photoactivity compared to bare TiO2 and demonstrates recyclability and stability. The efficient synthesis of a variety of oxadiazoles highlights the optimal performance of this multifunctional photocatalytic material.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Ziru Wang et al.
Summary: In this study, Pt-loaded 1D monoclinic WO3 nanorods (Pt/m-WNR) showed higher activity in the photocatalytic oxidation of benzene to phenol under ambient conditions and visible light than other Pt/WO3 catalysts with different crystal structures and morphologies. Pt/m-WNR exhibited high stability in repeated reactions. The specific performance of Pt/m-WNR was attributed to the efficient reduction of O-2 to produce hydroxyl radicals via H2O2 as an intermediate, as evidenced by both experimental and theoretical findings.
Article
Chemistry, Multidisciplinary
Bin Wang et al.
Summary: In this study, the reaction mechanism of photocatalytic selective oxidation of toluene into benzaldehyde was investigated by density functional theory calculation. The results revealed that hydroxyl radicals and hydroperoxyl radicals played important roles in this reaction, and two main reaction pathways were summarized.
Article
Chemistry, Physical
Aniruddha Singha et al.
Summary: The synthesis of a mesoporous Fe2O3-TiO2 mix-oxide catalyst and its catalytic performance in the hydroxylation of benzene were investigated in this study. The catalyst was characterized using various techniques to determine its structural properties and surface acidity. It was observed that the surface acidity of the catalyst influenced the selectivity towards phenol. Under optimized conditions, the 5% Fe-TiO2 catalyst exhibited high phenol yield and selectivity.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Physical
Giacometta Mineo et al.
Summary: In this study, hexagonal/monoclinic WO3 phase junctions were formed by calcination of WO3 nanorods at 400 degrees C, leading to improved catalytic performance for HER. The highest efficiency of HER was achieved when WO3 nanorods exhibited comparable volumes of hexagonal and monoclinic phases.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Kunfeng Zhang et al.
Summary: Two-dimensional Bi2WO6, Bi2MoO6, and Bi2WxMo1_xO6 (x = 0.1, 0.3, 0.5, 0.7, and 0.9) solid solution photocatalysts were synthesized, with Bi2W0.3Mo0.7O6 showing the highest photocatalytic activity and selectivity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Sonu Bhandari et al.
Summary: Selective oxidation of benzene to phenol in a single step was achieved using a nanostructured iron chromite spinel catalyst under mild and environmentally friendly conditions. The catalyst demonstrated good recyclability and heterogeneous catalytic activity. DFT calculations supported the experimental results and provided insights into the reaction mechanism.
Article
Engineering, Environmental
C. A. Huerta-Mata et al.
Summary: Unsupported Ni/W catalysts were synthesized using a hydrothermal method, with Ni and W promoting the active phase, showing good activity under low pressure conditions, and confirming the reaction mechanism as the direct desulfurization pathway.
CHEMICAL ENGINEERING JOURNAL ADVANCES
(2022)
Article
Chemistry, Applied
Yu-Lan Wu et al.
Summary: Simultaneously utilizing photogenerated electrons and holes to convert renewable biomass and its derivatives into value-added products and hydrogen (H-2) is a promising strategy. In this study, a facile hydrothermal method is used to construct a direct Z-scheme CdS/WO3 binary composite for photocatalytic coupled redox reaction, producing H-2 and selectively converting aromatic alcohols into aromatic aldehydes in one pot. The CdS/WO3 binary composite exhibits significantly enhanced performance compared to bare CdS and WO3, attributed to its extended light harvesting range, efficient charge carrier separation rate, and optimized redox capability. The feasibility of converting various aromatic alcohols to aldehydes coupled with H-2 evolution on the CdS/WO3 photocatalyst is demonstrated, along with a proposed reaction mechanism.
CHINESE JOURNAL OF CATALYSIS
(2022)
Review
Engineering, Environmental
Lijarani Biswal et al.
Summary: MXenes have gained significant research attention in the field of photocatalysis due to their structure characteristics, serving as modifiers for TiO2 to enhance photocatalytic activity. TiO2, as a photocatalyst, exhibits excellent activity and availability but has drawbacks such as wide band gap and rapid recombination of photoinduced charge carriers.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Kana Aitsuki et al.
Summary: In this study, it was found that the photolysis of tetrabromocatechol on titanium dioxide produced surface-modified titanium dioxide, which showed higher activity than bare titanium dioxide in the reaction under visible light irradiation.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Min Wen et al.
Summary: In this study, a 2D heterostructure composed of nickel nanoparticle-decorated black phosphorus nanosheets and graphitic carbon nitride nanosheets was synthesized, demonstrating efficient charge separation and a high visible-light-driven H-2 evolution rate. Selective production of benzaldehyde was achieved by applying benzyl alcohol as a sacrificial agent.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
M. Szkoda et al.
Summary: The study investigated the effect of photointercalation on the photoelectrochemical properties of WO3. It was found that exfoliation led to the preparation of photo(electro)catalyst with improved performance. Additionally, the presence of alkali metal cations in the electrolyte was shown to influence the photocatalytic activity of the samples.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Yu-Xuan Tan et al.
Summary: The study demonstrates that the CdIn2S4-CdS composite, with compact heterojunctions and defect-induced sulfur vacancies, significantly enhances the photocatalytic activity and selectivity for toluene oxidation. The tight heterojunctions and abundant sulfur vacancies facilitate the separation and migration of photoinduced charge carriers, leading to improved photocatalytic efficiency.
Article
Chemistry, Physical
Yu Zhang et al.
Summary: The study achieved efficient conversion of quinolines to tetrahydroquinolines through photocatalytic means using hierarchical NiO/In2O3-CdS microspheres under visible light irradiation. Experimental and theoretical results indicated that NiO served as the active sites for the reaction, showing superior adsorption and activation of benzyl alcohol compared to metallic Ni.
Article
Chemistry, Physical
Yechen Wang et al.
Summary: Efficient production of H2O2 was achieved through oxygen reduction reaction on modified WO3 with Au nanoparticles. Au/WO3 showed superior performance due to selective ORR to H2O2 and release of protons into aqueous solution for H2O2 protection from decomposition.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Valentin Diez-Cabanes et al.
Summary: This study focuses on the factors limiting the photocatalytic performance of inorganic semiconductors and the development of visible light-driven catalysts. By controlling the size and shape of nanomaterials, the recombination rate of electron pairs can be slowed down, thereby improving photocatalytic efficiency.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Dnyanesh Vernekar et al.
Summary: This work investigates the catalytic activity of trimetallic mixed-metal oxyhydroxide WFeCoO(OH) for the direct oxidation of cyclohexane to adipic acid. The presence of acidic, basic, and redox sites on WFeCoO(OH) contributes to its enhanced catalytic performance. Surface lattice oxygen, acidity, and propensity to generate oxygen vacancies all play crucial roles in the catalytic process.
Article
Chemistry, Multidisciplinary
Rui Pang et al.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Article
Engineering, Chemical
Xin-Xin Deng et al.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2020)
Article
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Xuejun Zou et al.
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
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Jaeseoung Park et al.
CRYSTAL GROWTH & DESIGN
(2019)
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Yahang Ren et al.
JOURNAL OF CATALYSIS
(2019)
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Khabibulla Abdulaevich Abdullin et al.
ACS APPLIED ENERGY MATERIALS
(2019)
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Zhongyi Sheng et al.
CATALYSIS SCIENCE & TECHNOLOGY
(2019)
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Rui Lin et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2018)
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Yang-Fan Xu et al.
ADVANCED MATERIALS INTERFACES
(2018)
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Xing Cao et al.
Review
Chemistry, Multidisciplinary
Pengyu Dong et al.
ENVIRONMENTAL SCIENCE-NANO
(2017)
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Xin Wang et al.
ADVANCED POWDER TECHNOLOGY
(2017)
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Bo Yuan et al.
CHINESE JOURNAL OF CATALYSIS
(2017)
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Songcan Wang et al.
Review
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Zhen-Feng Huang et al.
ADVANCED MATERIALS
(2015)
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Hui Song et al.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2015)
Article
Chemistry, Multidisciplinary
Massimiliano D'Arienzo et al.
Review
Chemistry, Multidisciplinary
Xiaobo Chen et al.
CHEMICAL SOCIETY REVIEWS
(2012)
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Ying Peng Xie et al.
JOURNAL OF MATERIALS CHEMISTRY
(2012)
Article
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Arghya Dutta et al.
MICROPOROUS AND MESOPOROUS MATERIALS
(2012)
Article
Chemistry, Multidisciplinary
Haidong Zheng et al.
ADVANCED FUNCTIONAL MATERIALS
(2011)
Review
Chemistry, Multidisciplinary
Davide Ravelli et al.
CHEMICAL SOCIETY REVIEWS
(2009)
