College of Safety and Emergency Management Engineering, Taiyuan University of Technology
Shanxi Lu’an Chemical Group Co., Ltd.
State Key Laboratory of Coal and CBM Co-mining
Jinneng Holding Equipment Manufacturing Group Co., Ltd.
Institute of Coal Chemistry, Chinese Academy of Sciences

火焰喷雾热解法(FSP)是一种简单、快速、可规模化制备纳米催化剂的技术。通过火焰喷雾热解法合成CeO2和Pt-CeO2载体、Pd-Pt-CeO2催化剂，采用浸渍法在CeO2和Pt-CeO2载体分别沉积Pd-Pt和Pd而制得Pd-Pt双金属催化剂，并考察其甲烷催化燃烧性能。利用ICP、XRD、TEM、BET、H2-TPR、XPS和Raman对催化剂的物化性质进行分析。TEM结果表明，Pd-Pt/CeO2催化剂中Pd和Pt物种高分散于CeO2载体。相比于一步法(one step)制得的Pd-Pt-CeO2(OS-FSP)催化剂，共浸渍法制得Pd-Pt/CeO2(0.25)-WI的催化活性更高，其t50降低了60 ℃，且稳定运行60 h而没有明显失活。这归因于Pd-Pt/CeO2(0.25)-WI催化剂表面上Pd0/Pd2+和Ce3+/Ce4+物质的量比更高、晶格氧更多，进而导致其具有良好的甲烷催化燃烧性能。

Flame spray pyrolysis (FSP) is a versatile, rapid, and scalable preparation technique for the nanocatalysts. CeO2 and Pt-CeO2 carriers, Pd-Pt-CeO2 catalyst were synthesized by flame spray pyrolysis, and then Pd-Pt bimetallic catalysts were prepared by impregnation method, and as-obtained Pd-Pt catalysts were tested in the methane combustion. The physicochemical properties of the catalysts were characterized by ICP, XRD, TEM, BET, H2-TPR, XPS, and Raman. TEM results showed that Pd and Pt species were highly dispersed in CeO2 carriers in Pd-Pt/CeO2 catalysts. Compared with the Pd-Pt-CeO2(OS-FSP) catalyst prepared by one-step flame spray pyrolysis, the catalytic activity of the Pd-Pt/CeO2(0.25)-WI prepared by co-impregnation was higher, with its t50 reduced by 60 ℃, and no deactivation was seen for 60 h. It is attributed to the fact that the Pd-Pt/CeO2(0.25)-WI catalyst has a higher molar ratio of Pd0/Pd2+ and Ce3+/Ce4+ on the surface of the catalyst and more lattice oxygen, resulting in an excellent performance during the methane combustion.

煤与煤层气共采国家重点实验室开放基金 (2022KF12)，山西省科技成果转化引导专项 (202204021301010)，山西省科技创新人才团队项目 (202204051002025)和国家自然科学基金 (52004177)资助

武琳渊, 王乙, 陈召英, 田庆玲, 王琳茹, 付紫君, 赵宁, 王晓波, 黄鑫. 火焰喷雾热解制Pd-Pt/CeO2催化甲烷燃烧的性能研究[J]. 燃料化学学报（中英文）, 2024, 52(5): 725-734.

WU Linyuan, WANG Yi, CHEN Zhaoying, TIAN Qingling, WANG Linru, FU Zijun, ZHAO Ning, WANG Xiaobo, HUANG Xin. Methane catalytic combustion over flame spray pyrolysis-synthesized Pd-Pt/CeO2 catalyst[J]. Journal of Fuel Chemistry and Technology, 2024, 52(5): 725-734.