Catalytic performance enhancement by alloying Pd with Pt on ordered mesoporous manganese oxide for methane combustion

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• 作者：Peng Xu ; Zhixing Wu ; Jiguang Deng ; Yuxi Liu ; Shaohua Xie ; Guangsheng Guo ; ^{guogs@bjut.edu.cn} ; Hongxing Dai ; ^{hxdai@bjut.edu.cn}
• 关键词：Ordered mesoporous manganese oxide ; Pd-Pt alloy nanoparticle ; Supported noble metal catalyst ; Strong metal-support interaction ; Methane combustion
• 刊名：Chinese Journal of Catalysis
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：38
• 期：1
• 页码：92-105
• 全文大小：1752 K
• 卷排序：38

文摘

Ordered mesoporous Mn2O3 (meso-Mn2O3) and meso-Mn2O3-supported Pd, Pt, and Pd-Pt alloy x(PdyPt)/meso-Mn2O3; x = (0.10−1.50) wt%; Pd/Pt molar ratio (y) = 4.9−5.1 nanocatalysts were prepared using KIT-6-templated and poly(vinyl alcohol)-protected reduction methods, respectively. The meso-Mn2O3 had a high surface area, i.e., 106 m2/g, and a cubic crystal structure. Noble-metal nanoparticles (NPs) of size 2.1−2.8 nm were uniformly dispersed on the meso-Mn2O3 surfaces. Alloying Pd with Pt enhanced the catalytic activity in methane combustion; 1.41(Pd5.1Pt)/meso-Mn2O3 gave the best performance; T10%, T50%, and T90% (the temperatures required for achieving methane conversions of 10%, 50%, and 90%) were 265, 345, and 425 °C, respectively, at a space velocity of 20000 mL/(g·h). The effects of SO2, CO2, H2O, and NO on methane combustion over 1.41(Pd5.1Pt)/meso-Mn2O3 were also examined. We conclude that the good catalytic performance of 1.41(Pd5.1Pt)/meso-Mn2O3 is associated with its high-quality porous structure, high adsorbed oxygen species concentration, good low-temperature reducibility, and strong interactions between Pd-Pt alloy NPs and the meso-Mn2O3 support.