Combining in Situ NEXAFS Spectroscopy and CO2 Methanation Kinetics To Study Pt and Co Nanoparticle Catalysts Reveals Key Insights into the Role of Platinum in Promoted Cobalt Catalysis

被引：107

作者：

Beaumont, Simon K. ^{[1
,2
,4
]}

Alayoglu, Selim ^{[1
,2
]}

Specht, Colin ^{[1
,2
]}

Michalak, William D. ^{[1
,2
]}

Pushkarev, Vladimir V. ^{[1
,2
]}

Guo, Jinghua ^{[3
,5
]}

Kruse, Norbert ^{[6
,7
]}

Somorjai, Gabor A. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[4] Univ Durham, Dept Chem, Durham DH1 3LE, England

[5] Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA

[6] Univ Libre Bruxelles, B-1050 Brussels, Belgium

[7] Washington State Univ, Dept Chem Engn & Bioengn, Pullman, WA 99164 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2014年 / 136卷 / 28期

关键词：

FISCHER-TROPSCH SYNTHESIS; SOL/GEL METHOD; HYDROGENATION; REDUCTION;

D O I：

10.1021/ja505286j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The mechanistic role of platinum and precious metals in promoting cobalt hydrogenation catalysts of the type used in reactions such as Fischer-Tropsch synthesis is highly debated. Here we use well-defined monometallic Pt and Co nanoparticles (NPs) and CO2 methanation as a probe reaction to show that Pt NPs deposited near Co NPs can enhance the CO2 methanation rate by up to a factor of 6 per Co surface atom. In situ NEXAFS spectroscopy of these same Pt NP plus Co NP systems in hydrogen shows that the presence of nearby Pt NPs is able to significantly enhance reduction of the Co at temperatures relevant to Fischer-Tropsch synthesis and CO2 methanation. The mechanistic role of Pt in these reactions is discussed in light of these findings.

引用

页码：9898 / 9901

页数：4

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