Metal Oxides Treated by Oxy-Hydrogen Flame: Effects of Reducibility on Oxygen Vacancies, Pt-Support Interactions, and Chemoselective Hydrogenation

IF 3 3区化学 Q2 CHEMISTRY, APPLIED

Topics in Catalysis Pub Date : 2025-06-24 DOI:10.1007/s11244-025-02127-7

Ali Kamali, Zixiao Liu, Sooyeon Hwang, Antara Bhowmick, Akash Warty, Mohammed Almafrachi, Nusrat Sarwahrdy, Mohamad Al-Sheikhly, Dongxia Liu

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Abstract

Oxygen vacancy defects can serve as an effective strategy for developing high-performance metal oxide-based catalysts. The formation of oxygen vacancies depends on the reducibility of the metal oxide materials. In this study, we selected three metal oxides (MO_xs): iron oxide (Fe₂O₃), chromium oxide (Cr₂O₃), and zirconium oxide (ZrO₂), with varying degrees of reducibility to investigate oxygen vacancy formation and its consequent impact on platinum (Pt) dispersion and catalytic performance. An oxy-hydrogen flame treatment, characterized by high treatment temperatures and rapid heating and cooling rates, was employed to create oxygen vacancy defects in these metal oxides. The flame treatment promoted defect formation in the order of Fe₂O₃ > Cr₂O₃ > ZrO₂. These defects significantly influenced Pt dispersion and metal-support interactions. The catalytic performance of Pt/MO_x catalysts, both untreated and treated with the oxy-hydrogen flame, was evaluated in the chemoselective hydrogenation of 3-nitrostyrene. The selectivity toward 3-vinylaniline increased with the reducibility of the metal oxide support in the defective Pt/MO_x catalysts. Higher reducibility facilitated oxygen vacancy formation, enhanced Pt dispersion through metal-support interactions, and ultimately improved chemoselective hydrogenation performance.

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氢氧火焰处理金属氧化物：还原性对氧空位、pt -载体相互作用和化学选择性加氢的影响

氧空位缺陷可以作为开发高性能金属氧化物基催化剂的有效策略。氧空位的形成取决于金属氧化物材料的还原性。在这项研究中，我们选择了三种金属氧化物（MOxs）：氧化铁（Fe2O3）、氧化铬（Cr2O3）和氧化锆（ZrO2），它们具有不同程度的还原性来研究氧空位的形成及其对铂（Pt）分散和催化性能的影响。氢氧火焰处理具有处理温度高、加热和冷却速度快的特点，可以在这些金属氧化物中产生氧空位缺陷。火焰处理促进缺陷形成的顺序为Fe2O3 >； Cr2O3 > ZrO2。这些缺陷显著影响了Pt的分散和金属载体的相互作用。研究了Pt/MOx催化剂在3-硝基苯乙烯化学选择性加氢反应中的催化性能，考察了未处理和经氧氢火焰处理的Pt/MOx催化剂的催化性能。在缺陷Pt/MOx催化剂中，金属氧化物载体的还原性提高了对3-乙烯苯胺的选择性。更高的还原性促进了氧空位的形成，通过金属-载体相互作用增强了Pt的分散，最终提高了化学选择性加氢性能。

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

Topics in Catalysis 化学-物理化学

CiteScore

5.70

自引率

5.60%

发文量

197

审稿时长

2 months

期刊介绍： Topics in Catalysis publishes topical collections in all fields of catalysis which are composed only of invited articles from leading authors. The journal documents today’s emerging and critical trends in all branches of catalysis. Each themed issue is organized by renowned Guest Editors in collaboration with the Editors-in-Chief. Proposals for new topics are welcome and should be submitted directly to the Editors-in-Chief. The publication of individual uninvited original research articles can be sent to our sister journal Catalysis Letters. This journal aims for rapid publication of high-impact original research articles in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.