Promotion effect of Al species on silica-supported cesium oxide catalyst in the vapor-phase dehydration of 1,2-propanediol to propylene oxide

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-03-06 DOI:10.1016/j.apcata.2025.120208

Masafumi Morooka , Enggah Kurniawan , Junji Okamura , Yusei Nagamura , Takayoshi Hara , Takashi Kojima , Yasuhiro Yamada , Satoshi Sato

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Abstract

The introduction of Al into SiO₂-supported cesium oxide (Cs/SiO₂) promoted catalytic activity for the dehydration of 1,2-propanediol (1,2-PDO) to propylene oxide (PO). This improvement was attributed to the promotion of CsNO₃ decomposition and the ability of Al to keep the morphology of the SiO₂-supported catalyst, even though the Al component slightly reduced the concentration of the base site. The optimum molar component of Al was proven to improve the activity of Cs/SiO₂ catalyst, while maintaining a low rate of side reactions, such as isomerization of PO to allyl alcohol and dehydration of 1,2-PDO to propanal. Several parameters, such as reaction temperature, contact time, Cs₈Al₂ content, and Al molar component influenced catalytic activity and product distributions. The poisoning experiment by use of CO₂ revealed the importance of the base sites of Cs₈Al₂/SiO₂ catalyst, while the role of acid sites was negligible as confirmed by the poisoning experiment with NH₃.

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在1,2-丙二醇气相脱水制环氧丙烷过程中，Al对二氧化硅负载型氧化铯催化剂的促进作用

将Al引入SiO2负载型氧化铯（Cs/SiO2）中，促进了1,2-丙二醇（1,2- pdo）脱水制环氧丙烷（PO）的催化活性。这种改善是由于促进了cno3的分解和Al保持sio2负载催化剂形态的能力，即使Al组分略微降低了碱基的浓度。实验证明，Al的最佳摩尔组分可以提高Cs/SiO2催化剂的活性，同时保持较低的副反应率，如PO异构化成烯丙醇和1,2- pdo脱水成丙醛。反应温度、接触时间、Cs8Al2含量和Al摩尔组分等参数影响催化活性和产物分布。CO2中毒实验揭示了Cs8Al2/SiO2催化剂碱位的重要性，而NH3中毒实验证实了酸位的作用可以忽略不计。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.