Enhancing the catalytic performance of PdAu catalysts by W-induced strong interaction for the direct synthesis of H2O2

被引：5

作者：

Zhang, Meijia ^{[1
]}

Xu, Haoxiang ^{[1
]}

Luo, Yibin ^{[2
]}

Zhu, Jiqin ^{[1
]}

Cheng, Daojian ^{[1
]}

机构：

[1] Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, Beijing Key Lab Energy Environm Catalysis, Beijing 100029, Peoples R China

[2] SINOPEC, State Key Lab Catalyt Mat & React Engn, RIPP, Beijing 100083, Peoples R China

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2022年 / 12卷 / 17期

基金：

中国国家自然科学基金;

关键词：

HYDROGEN-PEROXIDE SYNTHESIS; EFFICIENT DIRECT H2O2; HEAT-TREATMENT; PALLADIUM; H-2; O-2; NANOPARTICLES; NANOCRYSTALS; ALLOY; SELECTIVITY;

D O I：

10.1039/d2cy00112h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The addition of non-noble metals is a promising method for developing PdAu-based catalysts for the direct synthesis of H<INF>2</INF>O<INF>2</INF>. Here, we prepared W-promoted PdAu/TiO<INF>2</INF> to enhance the synthesis of H<INF>2</INF>O<INF>2</INF>. The PdAu/WO<INF>3</INF>-TiO<INF>2</INF> catalyst, with pre-loading of W followed by PdAu presented the best performance with a H<INF>2</INF>O<INF>2</INF> yield and selectivity as high as 662.6 mol<INF>H<INF>2</INF>O<INF>2</INF></INF> kg<INF>cat</INF>-1 h-1 and 85.5%, respectively, superior to the PdAu/TiO<INF>2</INF> catalyst (450.2 mol<INF>H<INF>2</INF>O<INF>2</INF></INF> kg<INF>cat</INF>-1 h-1 and 73.9%). It was found that the W-induced strong interaction with PdAu is the key to the enhanced catalytic performance, with WO<INF>3</INF> species partially encapsulating the PdAu particles, and inducing the formation of surface PdO. However, excessive addition of W would completely coat the active metal PdAu and reduce the H<INF>2</INF>O<INF>2</INF> synthesis. Furthermore, the W promoter effect was demonstrated to be carrier-dependent. This work proves the facilitation mechanism of W and provides a promising strategy for developing PdAu-based catalysts for the direct synthesis of H<INF>2</INF>O<INF>2</INF>.

引用

页码：5290 / 5301

页数：12

共 77 条

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