Ethylene epoxidation over shape-selective silver-based catalysts

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-03-03 DOI:10.1016/j.apcata.2025.120200

Kaveh Shariati, Azadeh Mehrani, Trevor Corsello, Mason Kelley, Jochen Lauterbach

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Abstract

The catalytic activity and selectivity of silver catalysts in the ethylene epoxidation reaction are intrinsically linked to their faceting. Here, silver nanowires, representing Ag(100), and silver spherical catalysts, embodying Ag(111), were synthesized using modified polyol and wet impregnation methods, respectively. Recognizing the size-dependent nature of catalysis, two distinct sizes of spherical particles were synthesized to serve as comparative benchmarks for silver nanowire activity and selectivity. Silver spherical catalysts were promoted with optimal cesium loading. Furthermore, silver nanowires underwent cesium promotion at varying loadings, as meticulously detailed in the methodology. Unpromoted silver nanowires exhibited superior ethylene oxide selectivity compared to both unpromoted and promoted spherical catalysts. Additionally, the ethylene oxide selectivity was enhanced with the addition of the promoter, achieving activity and selectivity levels comparable to the best reported in the literature. Morphological analysis of spent silver nanowire catalysts revealed exceptional stability even after extended study periods.

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选择性银基催化剂上的乙烯环氧化反应

银催化剂在乙烯环氧化反应中的催化活性和选择性与其饰面有内在联系。本文分别采用改性多元醇和湿浸渍法制备了代表Ag（100）的银纳米线和代表Ag（111）的银球形催化剂。认识到催化的大小依赖性质，合成了两种不同大小的球形颗粒，作为银纳米线活性和选择性的比较基准。对银球形催化剂进行了优化的铯负载。此外，银纳米线在不同的负载下经历了铯的促进，如方法中所详细描述的那样。与未促进的球形催化剂和未促进的球形催化剂相比，未促进的银纳米线表现出更好的环氧乙烷选择性。此外，随着启动子的加入，环氧乙烷的选择性得到了增强，达到了与文献中最好的报道相当的活性和选择性水平。形态学分析表明，即使经过长时间的研究，废银纳米线催化剂也具有优异的稳定性。

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.