Atomic origins of the strong metal-support interaction in silica supported catalysts

被引：51

作者：

Yang, Feng ^{[1
,2
]}

Zhao, Haofei ^{[3
]}

Wang, Wu ^{[4
]}

Wang, Lei ^{[2
]}

Zhang, Lei ^{[2
]}

Liu, Tianhui ^{[2
]}

Sheng, Jian ^{[1
]}

Zhu, Sheng ^{[1
]}

He, Dongsheng ^{[5
]}

Lin, Lili ^{[6
]}

He, Jiaqing ^{[4
]}

Wang, Rongming ^{[3
]}

Li, Yan ^{[1
]}

机构：

[1] Peking Univ, Beijing Natl Lab Mol Sci, Key Lab Phys & Chem Nanodevices, Coll Chem & Mol Engn,State Key Lab Rare Earth Mat, Beijing 100871, Peoples R China

[2] Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Guangdong, Peoples R China

[3] Univ Sci & Technol Beijing, Sch Math & Phys, Beijing Adv Innovat Ctr Mat Genome Engn, Ctr Green Innovat,Beijing Key Lab Magnetophotoele, Beijing 100083, Peoples R China

[4] Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

[5] Southern Univ Sci & Technol, Core Res Facil, Shenzhen 518055, Guangdong, Peoples R China

[6] Zhejiang Univ Technol, State Key Lab Green Chem Synth Technol, Hangzhou 310032, Peoples R China

来源：

CHEMICAL SCIENCE | 2021年 / 12卷 / 38期

基金：

中国国家自然科学基金;

关键词：

WALLED CARBON NANOTUBES; HIGH-TEMPERATURE REDUCTION; HETEROGENEOUS CATALYSTS; ELECTRON-MICROSCOPY; NANOPARTICLES; GROWTH; OXIDE; INTERFACE; OXIDATION; RH;

D O I：

10.1039/d1sc03480d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Silica supported metal catalysts are most widely used in the modern chemical industry because of the high stability and tunable reactivity. The strong metal-support interaction (SMSI), which has been widely observed in metal oxide supported catalysts and significantly affects the catalytic behavior, has been speculated to rarely happen in silica supported catalysts since silica is hard to reduce. Here we revealed at the atomic scale the interfacial reaction induced SMSI in silica supported Co and Pt catalysts under reductive conditions at high temperature using aberration-corrected environmental transmission electron microscopy coupled with in situ electron energy loss spectroscopy. In a Co/SiO2 system, the amorphous SiO2 migrated onto the Co surface to form a crystallized quartz-SiO2 overlayer, and simultaneously an interlayer of Si was generated in-between. The metastable crystalline SiO2 overlayer subsequently underwent an order-to-disorder transition due to the continuous dissociation of SiO2 and the interfacial alloying of Si with the underlying Co. The SMSI in the Pt-SiO2 system was found to remarkably boost the catalytic hydrogenation. These findings demonstrate the universality of the SMSI in oxide supported catalysts, which is of general importance for designing catalysts and understanding catalytic mechanisms.

引用

页码：12651 / 12660

页数：10

共 75 条

[1] The dynamics of overlayer formation on catalyst nanoparticles and strong metal-support interaction [J].