Support stabilized PtCu single-atom alloys for propane dehydrogenation

被引:48
作者
Liu, Xiaohe [1 ]
Wang, Xianhui [1 ]
Zhen, Shiyu [1 ]
Sun, Guodong [1 ]
Pei, Chunlei [1 ,2 ]
Zhao, Zhi-Jian [1 ,2 ]
Gong, Jinlong [1 ,2 ,3 ,4 ]
机构
[1] Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Sch Chem Engn & Technol, Key Lab Green Chem Technol,Minist Educ, Tianjin 300072, Peoples R China
[2] Tianjin Univ Ningbo, Zhejiang Inst, Ningbo 315201, Zhejiang, Peoples R China
[3] Haihe Lab Sustainable Chem Transformat, Tianjin 300192, Peoples R China
[4] Tianjin Univ, Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
COPPER-CATALYSTS; SURFACE OXIDATION; CU; SILICA; EFFICIENT; CU/SIO2; PERFORMANCE; DISPERSION; CHEMISTRY; STRATEGY;
D O I
10.1039/d2sc03723h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
PtCu single-atom alloys (SAAs) open an extensive prospect for heterogeneous catalysis. However, as the host of SAAs, Cu suffers from severe sintering at elevated temperature, resulting in poor stability of catalysts. This paper describes the suppression of the agglomeration of Cu nanoparticles under high temperature conditions using copper phyllosilicate (CuSiO3) as the support of PtCu SAAs. Based on quasi in situ XPS, in situ CO-DRIFTS, in situ Raman spectroscopy and in situ XRD, we demonstrated that the interfacial Cu+-O-Si formed upon reduction at 680 degrees C serves as the adhesive between Cu nanoparticles and the silicon dioxide matrix, strengthening the metal-support interaction. Consequently, the resistance to sintering of PtCu SAAs was improved, leading to high catalytic stability during propane dehydrogenation without sacrificing conversion and selectivity. The optimized PtCu SAA catalyst achieved more than 42% propane conversion and 93% propylene selectivity at 580 degrees C for at least 30 hours. It paves a way for the design and development of highly active supported single-atom alloy catalysts with excellent thermal stability.
引用
收藏
页码:9537 / 9543
页数:7
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