Steam-treated SAPO-18 with well-regulated acidity and excellent DTO performance

IF 3.2 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society Pub Date : 2025-01-01 DOI:10.1016/j.jics.2024.101505

You Gyong Ho , Song Chol Jong , Un Yong Paek , Un Chol Han , Hyon-Tae Pak , Ri Myong Kim

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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

Journal of the Indian Chemical Society 化学-化学综合

CiteScore

3.50

自引率

7.70%

发文量

492

审稿时长

3-8 weeks

期刊介绍： The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.