Tungsten trioxide-modified zeolite-based catalysts in the esterification of lactic acid: the effect of Si/Al ratio and WO3 loadings

Article Chemistry, Applied

Re-dispersion of active Zn species on modified S-1 zeolite as an efficient catalyst for direct dehydrogenation of propane

Junjie He et al.

Summary: A novel multi-component structure catalyst consisting of low Pt and abundant active Zn species highly dispersed on Fe-doped S-1 zeolite was developed, exhibiting outstanding performance in propane dehydrogenation.

MICROPOROUS AND MESOPOROUS MATERIALS (2023)

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Article Chemistry, Applied

Improving the methyl lactate yield from glucose over Sn-Al-Beta zeolite by catalyst promoters

Atte Aho et al.

Summary: Sn-Al-Beta zeolite was prepared and modified with alkali and alkaline earth metals, which did not significantly change the properties of the catalyst. The catalysts were tested in the conversion of glucose to methyl lactate, and the results showed that suppressing Bronsted acidity can greatly increase the yield of methyl lactate.

MICROPOROUS AND MESOPOROUS MATERIALS (2023)

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Review Chemistry, Multidisciplinary

On the catalytic vapor-phase dehydration of lactic acid to acrylic acid: a systematic review

Lin Huang et al.

Summary: "Review on the use of heterogeneous catalyst systems for the production of acrylic acid from lactic acid via vapor-phase dehydration" summarizes the research on the use of heterogeneous catalyst systems for the production of acrylic acid from lactic acid via vapor-phase dehydration. The review presents the catalytic performance and reaction mechanisms of various heterogeneous catalyst systems including sulfate salts, phosphate salts, nitrate salts, hydroxyapatites, and modified zeolites.

REACTION CHEMISTRY & ENGINEERING (2023)

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Article Engineering, Chemical

Conceptual Process Design to Produce Bio-Acrylic Acid via Gas Phase Dehydration of Lactic Acid Produced from Carob Pod Extracts

Victor M. Ortiz Martinez et al.

Summary: This study discusses the conceptual process design for the integrated production of bio-based acrylic acid from carob pod aqueous extracts. CHEMCAD was used for process simulation and cost estimation of relevant equipment. Based on the economic assessment, carob pod shows promise as a biomass source for bio-acrylic acid production, with a fixed capital investment of EUR 62.7 MM and an internal rate of return of 15.8%.

PROCESSES (2023)

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Article Energy & Fuels

Experimental and Mathematical Analysis of the Kinetics of the Low-Waste Process of Butyl Lactate Synthesis

Valeriy P. Meshalkin et al.

Summary: This study presents a novel non-catalytic interaction between ammonium lactate and n-butanol for the synthesis of butyl lactate. A mathematical model for the reactor unit of butyl lactate synthesis is derived based on the kinetic modeling of the reaction. The study provides insights into the kinetics and reaction pathways of the interaction between ammonium lactate and n-butanol.

ENERGIES (2023)

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Review Chemistry, Physical

Sustainable Biorefineries Based on Catalytic Biomass Conversion: A Review

Juan Camilo Solarte-Toro et al.

Summary: Biorefineries are potential alternatives to increase biomass use at the industrial level. Catalytic conversion of biomass to chemicals and energy vectors has been extensively studied. This paper reviews the role of catalytic conversion of biomass in biorefineries, emphasizing biocatalysis, carbon dioxide conversion, catalytic biomass upgrading, and sustainability metrics.

CATALYSTS (2023)

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Article Materials Science, Multidisciplinary

Tungsten oxide-copper oxide supported on reduced graphene oxide as a proficient electrocatalyst with enhanced hydrogen evolution efficiency in an alkaline media

Khadijah Mohammedsaleh Katubi et al.

Summary: This study focuses on hydrogen production through electrocatalysis using a newly synthesized and characterized nano-hybrid composite electrocatalyst. The electrocatalyst consists of mixed metal oxides and reduced graphene oxide. Various characterization techniques were used to evaluate the structural and morphological characteristics of the electrocatalyst. Electrochemical methods, including linear sweep voltammetry, Tafel slope, and electrochemical active surface area measurements, provided valuable insights into the catalytic efficiency and effectiveness of the electrocatalyst for the hydrogen evolution reaction. The findings demonstrate that the electrocatalyst WO3-CuO/rGO exhibits exceptional catalytic efficiency, with a current density of 200 mA/cm2 at an overpotential of -400 mV, a Tafel slope of 44 mVdec(-1), and low charge transfer resistance. Furthermore, chronoamperometric analysis confirms the electrocatalyst's durability and potential for practical applications.

CURRENT APPLIED PHYSICS (2023)

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Article Energy & Fuels

Lanthanum phosphate: an efficient catalyst for acrylic acid production through lactic acid dehydration

Nagaraju Nekkala et al.

Summary: The preparation and performance of catalysts for the conversion of lactic acid to acrylic acid were studied. By adjusting the lanthanum to phosphorus ratio and calcination temperature, the optimal catalyst combination was found, achieving high conversion of lactic acid and yield of acrylic acid.

BIOMASS CONVERSION AND BIOREFINERY (2022)

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Article Chemistry, Applied

Lactic acid conversion into acrylic acid and other products over natural and synthetic zeolite catalysts: theoretical and experimental studies

Natalia Sobu et al.

Summary: In this study, a theoretical and experimental approach for the production of acrylic acid from lactic acid using various zeolite catalysts was designed. The synthetic BEA and natural clinoptilolite CLI zeolites modified with metals (Sn, Co, Cu, and Fe) were prepared using an ion exchange method. The results showed that the metal M-O-M dimers were stable above oxygen bound with aluminum centers of the BEA and CLI zeolites. The investigated catalysts exhibited trends in the formation of by-products such as acrylic acid, pyruvic acid, 2,3-pentanedione, and acetaldehyde.

CATALYSIS TODAY (2022)

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Article Agricultural Engineering

Cs exchanged 12-tungstophosphoric acid supported on high-silica mesoporous Y zeolites for synthesis of ethyl lactate via catalytic esterification

Hengyu Shen et al.

Summary: This study developed a highly active and stable composite catalyst of polyoxometalates (POMs) supported on zeolite for the synthesis of ethyl lactate. The stability of the zeolitic support and the support heteropolyacid were found to be equally important for obtaining a stable catalyst.

BIOMASS & BIOENERGY (2022)

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Review Chemistry, Multidisciplinary

A Review on Zeolite: Application, Synthesis and Effect of Synthesis Parameters on Product Properties

Nurudeen Salahudeen

Summary: Zeolite synthesis can be conducted through hydrothermal, solvothermal, or ionothermal methods. The synthesis parameters are crucial for the success and quality of the synthesis. The presence of a template and ultrasonic treatment can enhance the progress of synthesis and result in a specific stable phase.

CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Physical

Physical and chemical behaviour of tungsten oxide in the presence of nickel additive under hydrogen and carbon monoxide atmospheres

Fairous Salleh et al.

Summary: The physical and chemical behavior of bulk tungsten oxide and Ni doped tungsten oxide were analyzed using temperature-programmed reduction technique, with XRD, FESEM, and XPS analysis. Reduction studies showed different pathways for WO3 and Ni-doped WO3 under H2 and CO atmospheres, with Ni additive enhancing WO3 reducibility and promoting tungsten carbide formation.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article

Magnesium Hydrogen Phosphate: An Efficient Catalyst for Acrylic Acid Production from Biorenewable Lactic Acid

Nagaraju Nekkala et al.

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY (2021)

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Article Engineering, Chemical

Synergistic Dual Catalytic System and Kinetics for the Alcoholysis of Poly(Lactic Acid)

Fabio M. Lamberti et al.

Summary: Plastic pollution is a global issue with production levels projected to increase significantly by 2050. Bioplastics and a circular production economy offer solutions, with the potential for chemically recycling bioplastics like polylactic acid (PLA) to address long-term biodegradation challenges and create value-added products. Synergistic effects between catalysts like zinc acetate dihydrate and 4-(dimethylamino)pyridine could enable large-scale PLA recycling.

PROCESSES (2021)

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Article Chemistry, Physical

Modification of commercial Y zeolites by alkaline-treatment for improved performance in the isomerization of glucose to fructose

Ping Zhu et al.

Summary: Commercial Y zeolites can be modified by alkaline treatment to create new mesoporous structures and increase tetrahedral extra-framework acidic aluminum, significantly improving the efficiency of catalyzing glucose isomerization to fructose.

MOLECULAR CATALYSIS (2021)

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Proceedings Paper Materials Science, Multidisciplinary

Synthesis of a novel bifunctional mesoporous Ti-SBA-15-SO3H catalyst and studies on their enhanced performance and kinetic modeling of lactic acid esterification reaction with n-butanol

Suman Chirra et al.

Summary: In this study, mesoporous Ti-SBA-15-SO3H catalyst was synthesized and characterized using various advanced analytical techniques. The catalyst showed high catalytic activity and stability in lactic acid esterification reaction, with optimal conditions identified for maximum conversion. Additionally, a plausible mechanism for the catalytic activity was proposed based on the experimental results.

MATERIALS TODAY-PROCEEDINGS (2021)

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Article Chemistry, Multidisciplinary

Improving the hydrothermal stability of zeolite Y by La3+ cation exchange as a catalyst for the aqueous-phase hydrogenation of levulinic acid

Hue-Tong Vu et al.

Summary: La3+ cation exchange improves the hydrothermal stability and catalytic activity of bifunctional zeolite Pt/Y catalysts for the hydrogenation reaction, leading to significant enhancements in reactant conversion and product selectivity.

RSC ADVANCES (2021)

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Review Chemistry, Physical