CeO2 / AlOOH负载的Pt催化剂在室温下增强的甲醛氧化,Applied Catalysis B: Environment and Energy

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CeO2 / AlOOH负载的Pt催化剂在室温下增强的甲醛氧化
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2016-07-08 11:25:01
Zhaoxiong Yan, Zhihua Xu, Jiaguo Yu, Mietek Jaroniec

通过将微乳化辅助的AlOOH和CeO ₂杂化物的合成与NaBH ₄还原的Pt前体相结合，制备了CeO ₂ / AlOOH负载的Pt催化剂。通过将Pt纳米颗粒沉积在CeO ₂ / AlOOH（1：9摩尔比）载体（Pt / Al ₉ Ce ₁）上而制得的催化剂表现出显着的催化活性和在室温下氧化去除甲醛（HCHO）蒸气的稳定性。温度。Pt / Al ₉ Ce ₁催化剂的优异性能归因于表面羟基的丰富，CeO _2中的储氧，Pt纳米颗粒的高分散性和AlOOH的优异吸附性能。使用原位DRIFTS，针对室温下Pt / Al ₉ Ce ₁表面吸附的中间体的行为研究了HCHO分解的机理。结果表明，HCHO氧化过程中在表面形成的主要物质是反应中间体，在存在O ₂的情况下可以直接氧化为CO ₂。。通过利用AlOOH纳米薄片对HCHO的高吸附亲和力，可还原的氧化铈纳米颗粒和Pt纳米颗粒对HCHO氧化的出色催化活性，有可能设计出一种用于HCHO室温分解的优良纳米结构催化剂。该策略也可用于制造用于先进应用（例如环境修复）的新型纳米结构催化剂。

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Enhanced formaldehyde oxidation on CeO2/AlOOH-supported Pt catalyst at room temperature

A CeO₂/AlOOH-supported Pt catalyst was prepared by combining the microemulsion-assisted synthesis of AlOOH and CeO₂ hybrid with NaBH₄-reduction of Pt precursor. The as-prepared catalyst obtained by depositing Pt nanoparticles on the CeO₂/AlOOH (1:9 molar ratio) support (Pt/Al₉Ce₁) exhibited a remarkable catalytic activity and stability for oxidative removal of formaldehyde (HCHO) vapor at room temperature. The excellent performance of Pt/Al₉Ce₁ catalyst could be attributed to the abundance of surface hydroxyls, oxygen storage in CeO₂, high dispersion of Pt nanoparticles, and excellent adsorption performance of AlOOH. The mechanism of HCHO decomposition was investigated with respect to the behavior of adsorbed intermediates on the Pt/Al₉Ce₁ surface at room temperature using in situ DRIFTS. The results suggest that the main species formed on the surface during HCHO oxidation are the reaction intermediates, which could be directly oxidized to CO₂ in the presence of O₂. By taking advantage of high adsorption affinity of AlOOH nanoflakes toward HCHO, reducible ceria nanoparticles and excellent catalytic activity of Pt nanoparticles toward HCHO oxidation, it was possible to design a superior nanostructured catalyst for room temperature decomposition of HCHO. This strategy can be also applied to fabricate novel nanostructured catalysts for advanced applications such as environmental remediation.

更新日期：2016-07-09

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