Synergistic tuning of the phase structure of alumina and ceria-zirconia in supported palladium catalysts for enhanced methane combustion

被引：8

作者：

Lin, Jia ^{[1
]}

Chen, Yelin ^{[1
]}

Huang, Jiangli ^{[1
]}

Cai, Guohui ^{[2
]}

Xiao, Yihong ^{[2
]}

Zhan, Yingying ^{[2
]}

Zheng, Ying ^{[1
]}

机构：

[1] Fujian Normal Univ, Coll Chem & Mat Sci, Fujian Prov Key Lab Adv Mat Oriented Chem Engn, Fuzhou 350007, Fujian, Peoples R China

[2] Fuzhou Univ, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Fujian, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 67期

基金：

中国国家自然科学基金;

关键词：

Methane combustion; Pd-based catalysts; CeO2-ZrO2-Al2O3 composite oxides; Phase structure; Surface property; CONTROLLABLE SYNTHESIS; ACTIVE-SITES; CO OXIDATION; MIXED OXIDES; TEMPERATURE; PD; PD/AL2O3; BEHAVIOR; DECOMPOSITION; RESISTANCE;

D O I：

10.1016/j.ijhydene.2021.07.151

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：

CeO2-ZrO2-Al2O3 composite oxides supported palladium catalysts (Pd/CZA) are promising candidates for catalytic oxidation reactions. However, the efficient and stable oxidation of methane over Pd-based catalysts remains a longstanding challenge. Herein, we present a facile strategy to boost the catalytic performance of Pd/CZA through elaborately tuning the phase structure of supports. Calcining supports at relatively high temperatures (1200, 1300 degrees C) induced the phase transition of alumina (from gamma- to alpha-) and the development of CeO2-ZrO2 solid solution (CZ). The weak interaction between alpha-Al2O3 and PdO resulted in an improved reducibility of catalysts. Meanwhile, the higher oxygen mobility originated from well-crystallized CZ phase contributed to the reoxidation of Pd to PdO, giving rise to abundant surface active Pd2+ species. Coupled with the hydrophobicity of alpha-Al2O3, the catalyst prepared with CZA supports calcined at 1300 degrees C demonstrated an excellent low-temperature activity, astounding stability and greatly enhanced water resistance towards methane combustion. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：33397 / 33408

页数：12

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