Citation: Peng Xu, Zhixing Wu, Jiguang Deng, Yuxi Liu, Shaohua Xie, Guangsheng Guo, Hongxing Dai. Catalytic performance enhancement by alloying Pd with Pt on ordered mesoporous manganese oxide for methane combustion[J]. Chinese Journal of Catalysis, ;2017, 38(1): 92-105. doi: 10.1016/S1872-2067(16)62567-6 shu

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

Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, and Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engi-neering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Received Date: 31 August 2016
Revised Date: 25 September 2016

Fund Project: This work was supported by the Ph.D. Program Foundation of Ministry of Education of China (20131103110002)

Ordered mesoporous Mn₂O₃ (meso-Mn₂O₃) and meso-Mn₂O₃-supported Pd, Pt, and Pd-Pt alloy x(Pd_yPt)/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. Al-loying Pd with Pt enhanced the catalytic activity in methane combustion; 1.41(Pd_5.1Pt)/meso-Mn₂O₃ gave the best performance; T_10%, T_50%, and T_90% (the temperatures required for achieving methane conversions of 10%, 50%, and 90%) were 265, 345, and 425℃, respectively, at a space velocity of 20000 mL/(g·h). The effects of SO₂, CO₂, H₂O, and NO on methane combustion over 1.41(Pd_5.1Pt)/meso-Mn₂O₃ were also examined. We conclude that the good catalytic performance of 1.41(Pd_5.1Pt)/meso-Mn₂O₃ is associated with its high-quality porous structure, high adsorbed oxy-gen species concentration, good low-temperature reducibility, and strong interactions between Pd-Pt alloy NPs and the meso-Mn₂O₃ support.
- Ordered mesoporous manganese oxide,
- Pd-Pt alloy nanoparticle,
- Supported noble metal catalyst,
- Strong metal-support interaction,
- Methane combustion
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