Identifying Dynamic Structural Changes of Active Sites in Pt–Ni Bimetallic Catalysts Using Multimodal Approaches

Liu, Deyu; Li, Yuanyuan; Kottwitz, Matthew; Yan, Binhang; Yao, Siyu; Gamalski, Andrew; Grolimund, Daniel; Safonova, Olga V.; Nachtegaal, Maarten; Chen, Jingguang G.; Stach, Eric A.; Nuzzo, Ralph G.; Frenkel, Anatoly I.

doi:10.1021/acscatal.8b00706

Title: Identifying Dynamic Structural Changes of Active Sites in Pt–Ni Bimetallic Catalysts Using Multimodal Approaches

Journal Article · Mon Apr 02 00:00:00 EDT 2018 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.8b00706· OSTI ID:1466591

^[1]; Li, Yuanyuan ^[2]; Kottwitz, Matthew ^[1]; Yan, Binhang ^[3]; Yao, Siyu ^[3]; Gamalski, Andrew ^[4];

^[5]; Safonova, Olga V. ^[5]; Nachtegaal, Maarten ^[5];

^[6];

^[7]; Nuzzo, Ralph G. ^[1];

^[8]

Univ. of Illinois, Urbana, IL (United States). Dept. of Chemistry
Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering
Brookhaven National Lab. (BNL), Upton, NY (United States). Division of Chemistry
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Brookhaven National Lab. (BNL), Upton, NY (United States). Division of Chemistry; Columbia Univ., New York, NY (United States). Dept. of Chemical Enginerring
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Division of Chemistry

Alloy nanoparticle catalysts are known to afford unique activities that can differ markedly from their parent metals, but there remains a generally limited understanding of the nature of their atomic (and likely dynamic) structures as exist in heterogeneously supported forms under reaction conditions. Notably unclear is the nature of their active sites and the details of the varying oxidation states and atomic arrangements of the catalytic components during chemical reactions. In this work, we describe multimodal methods that provide a quantitative characterization of the complex heterogeneity present in the chemical and electronic speciations of Pt–Ni bimetallic catalysts supported on mesoporous silica during the reverse water gas shift reaction. The analytical protocols involved a correlated use of in situ X-ray Absorption Spectroscopy (XAS) and Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), complimented by ex-situ aberration corrected Scanning Transmission Electron Microscopy (STEM). The data reveal that complex reactions occur between the metals and support in this system under operando conditions. These reactions, and the specific impacts of strong metal–silica bonding interactions, prevent the formation of alloy phases containing Ni–Ni bonds. This feature of structure provides high activity and selectivity for the reduction of CO₂ to carbon monoxide without significant competitive levels of methanation. In conclusion, we show how these chemistries evolve to the active state of the catalyst: bimetallic nanoparticles possessing an intermetallic structure (the active phase) that are conjoined with Ni-rich, metal-silicate species.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1466591

Report Number(s):: BNL-207996-2018-JAAM

Journal Information:: ACS Catalysis, Vol. 8, Issue 5; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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