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Zeolites as Catalysts: Applications in Chemical Engineering, Energy Sources and Environmental Protection, 2nd Edition

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Special Issue Editor

Special Issue Information

Dear Colleagues,

This is the second edition of the successful Special Issue titled “Zeolites as Catalysts: Applications in Chemical Engineering, Energy Sources and Environmental Protection”.

Zeolites are crystalline aluminosilicates that possess a 3D network structure, and they are widely considered to be the leading materials of the last few decades in the fields of chemical engineering, energy sources, and environmental protection. Zeolites with various pore sizes can be obtained with different ratios of SiO₂ and Al₂O₃, demonstrating large specific areas and strong gas adsorption. Therefore, they are commonly used for various processes, such as dehydration, gas separation and synthesis, air pollution control (H₂S, SO₂ and NOx decontamination), fuel conversion (electrolyte film), and petroleum cracking, among others, playing the role of membrane, catalyst, and support.

This Special Issue is dedicated to novel research and discussions on zeolites, with a focus on, but not limited to, the following:

Fundamental research on the mechanisms of the formation of pores for zeolites;
Zeolites used as the membrane, catalyst, and support;
Theoretical simulation and machine learning research for zeolites;
Novel applications for zeolites;
Related porous materials.

Original research papers and reviews providing new insights into the area are welcome. If you would like to submit papers for publication in this Special Issue or have any questions, please contact the in-house Editor, Mr. Ives Liu ([email protected]).

Dr. De Fang
Guest Editor

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15 pages, 3920 KiB

Open AccessFeature PaperArticle

Synthesis of High-Quality TS-1 Zeolites Using Precursors of Diol-Based Polymer and Tetrapropylammonium Bromide for 1-Hexene Epoxidation

by Yuting Sun, Xinyu Chang, Junling Zhan, Chongyao Bi, Zhehan Dong, Shuaishuai Sun and Mingjun Jia

Catalysts 2024, 14(12), 939; https://doi.org/10.3390/catal14120939 - 18 Dec 2024

Viewed by 542

Abstract

To synthesize high-quality TS-1 zeolites with enhanced catalytic performance for 1-hexene epoxidation is highly attractive for meeting the increased need for sustainable chemistry. Herein, we report that a series of framework Ti-enriched TS-1 zeolites with high crystallinity can be effectively synthesized by the hydrothermal crystallization of a composite precursor composed of diol-based polymer (containing titanium and silicon) and tetrapropylammonium bromide (TPABr). The pre-addition of a certain amount of TPABr into the polymer-based precursor plays a very positive role in maintaining the high crystallinity and framework Ti incorporation rate of TS-1 zeolites under the premise that a relatively low concentration of tetrapropylammonium hydroxide (TPAOH) template is adopted in the following hydrothermal crystallization process. The condition-optimized TS-1 zeolite with a smaller particle size (300–500 nm) shows excellent catalytic activity, selectivity, and recyclability for the epoxidation of 1-hexene with H₂O₂ as an oxidant, which can achieve a 75.4% conversion of 1-hexene and a 99% selectivity of epoxide at a reaction temperature of 60 °C, which is much better than the TS-1 zeolites reported in the previous literature. The relatively small particle size of the resultant TS-1 crystals may enhance the accessibility of the catalytically active framework Ti species to reagents, and the absence of non-framework Ti species, like anatase TiO₂, and low polymerized six-coordinated Ti species could effectively inhibit the ineffective decomposition of H₂O₂ and the occurrence of side reactions, leading to an improvement in the catalytic efficiency for the epoxidation of 1-hexente with H₂O₂. Full article

(This article belongs to the Special Issue Zeolites as Catalysts: Applications in Chemical Engineering, Energy Sources and Environmental Protection, 2nd Edition)

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15 pages, 4408 KiB

Open AccessFeature PaperArticle

Cu/MOF-808 Catalyst for Transfer Hydrogenation of 5-Hydroxymethylfurfural to 2, 5-Furandimethanol with Formic Acid Mediation

by Jingxin Tan, Mengqi Li, Lingtao Liu, Lijian Wang, Haocun Wang, Junjie Bian and Chunhu Li

Catalysts 2024, 14(12), 929; https://doi.org/10.3390/catal14120929 - 17 Dec 2024

Viewed by 563

Abstract

Biomass platform compound 5-Hydroxymethylfurfural (HMF), with its low price and abundant source, can be used as a renewable resource to replace traditional petrochemicals. MOF-808(Zr) has tunable active sites and excellent stability under high temperatures and acidic as well as basic environments, and the unsaturated coordination of metal ions within its framework structure can exhibit Lewis acidity, facilitating catalytic transfer hydrogenation from HMF to 2, 5-Furandimethanol (BHMF). The hydrothermal–impregnation–reduction method was used to prepare Cu/MOF-808 catalysts with high catalytic performance. Formic acid was chosen as the hydrogen donor solvent. The selectivity and yield of BHMF were 75.65% and 71%, respectively, at 150 °C for 4 h. A reaction pathway for the catalytic hydrogen transfer of HMF to BHMF was proposed. The high activity and stability of the Cu/MOF-808 catalyst with dual active sites provide a viable method for feasible hydrogenation of HMF to high value-added compounds. Full article

(This article belongs to the Special Issue Zeolites as Catalysts: Applications in Chemical Engineering, Energy Sources and Environmental Protection, 2nd Edition)

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