Single-site Pt/La-Al2O3 stabilized by barium as an active and stable catalyst in purifying CO and C3H6 emissions

Wang, Hui; Dong, Jinshi; Allard, Lawrence F.; Lee, Sungsik; Oh, Se; Wang, Jun; Li, Wei; Shen, Meiqing; Yang, Ming

doi:10.1016/j.apcatb.2018.11.034

Single-site Pt/La-Al₂O₃ stabilized by barium as an active and stable catalyst in purifying CO and C₃H₆ emissions

Journal Article · Mon Nov 19 00:00:00 EST 2018 · Applied Catalysis B: Environmental

DOI:https://doi.org/10.1016/j.apcatb.2018.11.034· OSTI ID:1492696

Wang, Hui ^[1]; Dong, Jinshi ^[1]; Allard, Lawrence F. ^[2]; Lee, Sungsik ^[3]; Oh, Se ^[4]; Wang, Jun ^[1]; Li, Wei ^[4]; Shen, Meiqing ^[1]; Yang, Ming ^[4]

Tianjin Univ., Tianjin (China). School of Chemical Engineering & Technology
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
General Motors Global Research and Development, Warren, MI (United States). Chemical and Materials Systems Lab.

High-temperature operations present a substantial challenge for developing industrial-capable precious metal catalysts (e.g. Pt/alumina), where the scarce metal atoms easily become wasted as sintered nanoparticles. Using fully dispersed precious metal atoms to deliver the catalysis remains an elusive goal. On a widely used La-stabilized alumina support, we find that the atomically dispersed Pt₁(II)-O_x- species, rather than the much more visible large metal particles, are the actual catalytic sites for the CO and C₃H₆ oxidation reactions. Unfortunately, the La dopants in alumina support will not hinder the sintering of the active Pt1(II)-Ox- species. As a natural next step, the Ba-Ox- species were introduced to specifically stabilize the single-atom Pt on the La-stabilized alumina support. By implementing this improved formulation, the atomically dispersed Pt on alumina retains the original full dispersion even after 650 °C hydrothermal aging. Intriguingly, with or without the barium additives and/or sintered platinum particles in the catalysts, the intrinsic activity per Pt atom stays intact. Along with other experimental evidence, this leads to the finding that the single-atom Pt is the true catalytic site for the oxidation of CO and C₃H₆ in the widely-used Pt/La-Al₂O₃ material system. This work provides a new perspective for efficient precious metal utilization under demanding catalytic conditions.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: General Motors, R&D, Warren, MI (United States); National Key Research and Development Program of China; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1492696

Journal Information:: Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Journal Issue: C Vol. 244; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Alumina
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