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Title: Nanoceria Supported Single-Atom Platinum Catalysts for Direct Methane Conversion

Nanoceria-supported atomic Pt catalysts (denoted as Pt 1@CeO 2) have been synthesized and demonstrated with advanced catalytic performance for the non-oxidative, direct conversion of methane. These catalysts were synthesized by calcination of Pt-impregnated porous ceria nanoparticles at high temperature (ca. 1,000 °C), with the atomic dispersion of Pt characterized by combining aberra-tion-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectroscopy (XPS), X-ray absorption spec-troscopy (XAS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analyses. The Pt 1@CeO 2 catalysts exhibited much superior catalytic performance to its nanoparticulated counterpart, achieving 14.4% of methane conversion at 975 °C and 74.6% selectivity toward C 2 products (ethane, ethylene and acetylene). Comparative studies of the Pt1@CeO 2 catalysts with different loadings as well as the nanoparticulated counterpart reveal the single-atom Pt to be the active sites for selective conversion of methane into C 2 hydrocarbons.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [3] ;  [4] ;  [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemical and Biomolecular Engineering
  2. Shanghai Univ., Shanghai (China). Shanghai Univ. Materials Genome Inst. and Shanghai Materials Genome Inst.
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  4. Purdue Univ., West Lafayette, IN (United States). School of Chemical Engineering
Publication Date:
Report Number(s):
BNL-203465-2018-JAAM
Journal ID: ISSN 2155-5435
Grant/Contract Number:
SC0012704; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
ACS Catalysis
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2155-5435
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; single atom catalysts; direct methane conversion; platinum; ceria nanocrystals; carbon coking
OSTI Identifier:
1431456