SiO2-supported niobia catalyst with optimized acid concentration prepared via organic additive-assisted impregnation protocol for the vapor-phase aldol condensation of butanal

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-08-17 DOI:10.1016/j.apcata.2025.120513

Kohta Horio, Enggah Kurniawan, Saho Nakayama, Takayoshi Hara, Takashi Kojima, Yasuhiro Yamada, Satoshi Sato

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引用次数: 0

Abstract

In this study, we prepared SiO₂-supported niobium oxide (Nb/SiO₂) catalysts with optimized acid concentrations using an organic additive (OA)-assisted impregnation protocol for the vapor-phase aldol condensation of butanal to 2-ethyl-2-hexenal (2E2H). The inclusion of an OA, such as 18-crown-6-ether, during the impregnation process enhanced the acid concentration of the resulting Nb/SiO₂ catalyst. This increase in acid concentration proved to be crucial for the vapor-phase aldol condensation of butanal to 2E2H, as confirmed by a proportional correlation between the acid concentration and the formation rate of 2E2H. Additionally, the essential role of acid sites, in particular Brønsted acid sites, of the Nb/SiO₂ catalyst was confirmed through poisoning experiments using several probe molecules, including NH₃, CO₂, and 2,6- and 3,5-dimethylpyridine. Several other parameters, such as Nb content and molar ratio of OA to Nb, also affected the catalytic activity of Nb/SiO₂ catalyst.

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采用有机添加剂辅助浸渍法制备了最佳酸浓度的二氧化硅负载铌催化剂，用于丁醛气相醛醇缩合反应

在本研究中，我们采用有机添加剂（OA）辅助浸渍方案，制备了酸浓度优化的二氧化硅负载氧化铌（Nb/SiO2）催化剂，用于丁醛气相缩成2-乙基-2-己烯醛（2E2H）。在浸渍过程中加入OA，如18-冠-6-醚，提高了所得到的Nb/SiO2催化剂的酸浓度。酸浓度的增加被证明是丁醛气相缩成2E2H的关键，正如酸浓度和2E2H形成速率之间的比例关系所证实的那样。此外，通过几种探针分子（包括NH3、CO2和2,6-和3,5-二甲基吡啶）的中毒实验，证实了Nb/SiO2催化剂的酸位点，特别是Brønsted酸位点的重要作用。Nb含量、OA与Nb的摩尔比等参数也影响了Nb/SiO2催化剂的催化活性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.