Divergent Acid-Treatment Effects on (CrMnFeCoNi)Ox for the Catalytic Oxidation of Propane

IF 6.3 Q1 ENGINEERING, ENVIRONMENTAL

ACS ES&T engineering Pub Date : 2026-09-11 Epub Date: 2026-07-07 DOI:10.1021/acsestengg.6c00461

Bowen Han, Yang Li, Xueqing Luo, Li Xiang, Hehe Qian, Feng Bi, Zhongbiao Wu, Xiaole Weng

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Abstract

Achieving efficient catalytic oxidation of propane remains a challenge in pollution control. High-entropy oxides (HEOs) are promising catalysts for this reaction owing to their abundant defects and high thermal stability. To further improve their performance, we investigated the divergent effects of acid treatment on HEO catalysts for propane oxidation. The catalyst treated with citric acid (HEO-CA) exhibited enhanced activity, lowering T₉₀ by 13 °C, whereas the catalyst treated with phosphoric acid (HEO-PA) increased T₉₀ by 11 °C. Characterization revealed that both acid treatments introduced additional defects. On HEO-CA, the residual surface organic species were readily decomposed, allowing oxygen vacancies to promote the activation of gaseous O₂ and to enhance the availability of reactive lattice oxygen. In contrast, although HEO-PA possessed more oxygen vacancies, the retained phosphate species hindered oxygen migration and lattice oxygen replenishment. This ultimately suppressed deep oxidation and degraded catalytic performance.

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歧化酸处理对（CrMnFeCoNi）Ox催化丙烷氧化的影响

实现丙烷的高效催化氧化仍然是污染控制中的一个挑战。高熵氧化物（HEOs）由于其丰富的缺陷和高的热稳定性，是很有希望用于该反应的催化剂。为了进一步提高其性能，我们研究了酸处理对丙烷氧化HEO催化剂的不同影响。柠檬酸（HEO-CA）处理的催化剂活性增强，T90降低了13°C，而磷酸（HEO-PA）处理的催化剂T90提高了11°C。表征表明两种酸处理都引入了额外的缺陷。在HEO-CA上，残余的表面有机物质容易分解，允许氧空位促进气态O2的活化，并提高活性晶格氧的可用性。相比之下，HEO-PA虽然具有更多的氧空位，但保留的磷酸盐阻碍了氧迁移和晶格氧的补充。这最终抑制了深度氧化并降低了催化性能。

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

ACS ES&T engineering ENGINEERING, ENVIRONMENTAL-

CiteScore

8.50

自引率

0.00%

发文量

期刊介绍： ACS ES&T Engineering publishes impactful research and review articles across all realms of environmental technology and engineering, employing a rigorous peer-review process. As a specialized journal, it aims to provide an international platform for research and innovation, inviting contributions on materials technologies, processes, data analytics, and engineering systems that can effectively manage, protect, and remediate air, water, and soil quality, as well as treat wastes and recover resources. The journal encourages research that supports informed decision-making within complex engineered systems and is grounded in mechanistic science and analytics, describing intricate environmental engineering systems. It considers papers presenting novel advancements, spanning from laboratory discovery to field-based application. However, case or demonstration studies lacking significant scientific advancements and technological innovations are not within its scope. Contributions containing experimental and/or theoretical methods, rooted in engineering principles and integrated with knowledge from other disciplines, are welcomed.