Dehydration of Isopropanol over Silica-Supported Heteropoly Acids

IF 3.8 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysts Pub Date : 2024-01-11 DOI:10.3390/catal14010051

Amal Alasmari, E. Kozhevnikova, I. Kozhevnikov

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Abstract

Dehydration of i-PrOH is used in academic research as a test reaction to probe the acid properties of solid acid catalysts. Also, it has practical importance for the utilization of surplus acetone produced by the Hock process for the combined manufacturing of phenol and acetone as well as for the production of propene from renewable resources and waste. This study demonstrates the excellent performance of polyoxometalate acid catalysts comprising silica-supported Keggin-type heteropoly acids H3PW12O40 and H4SiW12O40 for gas-phase i-PrOH-to-propene dehydration at ambient pressure. These catalysts show similar efficacies, giving an i-PrOH conversion and propene selectivity of 96.8 and 99.7% for 25%HPW/SiO2 and 97.1 and 99.4% for 25%HSiW/SiO2 in a fixed-bed reactor at 120 °C, a relevant-to-practice i-PrOH partial pressure of 15 kPa and a contact time W/F = 27 g h mol−1 (GHSV = 900 mL g−1 h−1). The catalysts are stable, resisting deactivation for at least 24 h time on stream. The HPA/SiO2 catalysts are superior to aluminosilicate zeolites such as H-mordenite, HZSM-5 and HY for i-PrOH-to-propene dehydration in terms of i-PrOH conversion, propene selectivity and catalyst stability.

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异丙醇在二氧化硅支撑的杂多酸上脱水

i-PrOH 脱水反应在学术研究中被用作探究固体酸催化剂酸性的试验反应。此外，它对于利用霍克工艺产生的剩余丙酮联合生产苯酚和丙酮以及利用可再生资源和废物生产丙烯也具有重要的实际意义。本研究证明了由二氧化硅支撑的凯金型杂多酸 H3PW12O40 和 H4SiW12O40 组成的聚氧化金属酸催化剂在常压下气相 i-PrOH 至丙烯脱水过程中的优异性能。这些催化剂显示出相似的效率，在固定床反应器中，温度为 120 °C，i-PrOH 分压为 15 kPa，接触时间 W/F = 27 g h mol-1（GHSV = 900 mL g-1 h-1），25%HPW/SiO2 的 i-PrOH 转化率和丙烯选择性分别为 96.8% 和 99.7%，25%HSiW/SiO2 的 i-PrOH 转化率和丙烯选择性分别为 97.1% 和 99.4%。催化剂非常稳定，至少在 24 小时内不会失活。在 i-PrOH 至丙烯的脱水过程中，HPA/SiO2 催化剂在 i-PrOH 转化率、丙烯选择性和催化剂稳定性方面均优于 H-莫来石、HZSM-5 和 HY 等铝硅酸盐沸石。

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来源期刊

Catalysts CHEMISTRY, PHYSICAL-

CiteScore

6.80

自引率

7.70%

发文量

1330

审稿时长

3 months

期刊介绍： Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.