Steam-treated SAPO-18 with well-regulated acidity and excellent dimethyl ether to olefin conversion performance

IF 1.7 4区化学 Q4 CHEMISTRY, PHYSICAL

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-11-18 DOI:10.1007/s11144-024-02749-0

You Gyong Ho, Song Chol Jong, Un Yong Paek, Songchol Hong

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引用次数: 0

Abstract

The hydrothermally synthesized SAPO-18 catalyst was steam treated to investigate the catalytic performance in dimethyl ether to olefins (DTO) reaction. After steam treatment, micropores and mesopores were created on the SAPO-18 catalyst. To evaluate the catalytic activity of steamed SAPO-18, the DTO reaction was carried out at 673 K with weight hourly space velocity (WHSV) of 3.546 h⁻¹, and the steamed SAPO-18 (S-773) at 773 K exhibited excellent DTO conversion performance (single-run lifetime 5.5 h, light olefin selectivity 95.9%) with BET surface area of 737 m² g⁻¹, mesopore volume of 125 mm³ g⁻¹, total amount of acid sites of 533 µmol g⁻¹, and Brønsted/Lewis ratio of 0.97. The improvement of DTO stability can be attributed to the increased mesoporosity and significantly reduced total amount of acid sites (well- regulated Brønsted/Lewis ratio) after steam treatment of SAPO-18 catalyst.

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来源期刊

Reaction Kinetics, Mechanisms and Catalysis CHEMISTRY, PHYSICAL-

CiteScore

3.30

自引率

5.60%

发文量

201

审稿时长

2.8 months

期刊介绍： Reaction Kinetics, Mechanisms and Catalysis is a medium for original contributions in the following fields: -kinetics of homogeneous reactions in gas, liquid and solid phase; -Homogeneous catalysis; -Heterogeneous catalysis; -Adsorption in heterogeneous catalysis; -Transport processes related to reaction kinetics and catalysis; -Preparation and study of catalysts; -Reactors and apparatus. Reaction Kinetics, Mechanisms and Catalysis was formerly published under the title Reaction Kinetics and Catalysis Letters.