Journal
CATALYSIS TODAY
Volume 371, Issue -, Pages 4-10Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2020.06.075
Keywords
SMSI effect on propane dehydrogenation; Strong metal-support interaction (SMSI); Electronic effect of SMSI; Geometric effect of SMSI
Funding
- National Science Foundation [EEC1647722]
- U.S. Department of Energy Office of BasicEnergy Sciences [DEAC0206CH11357]
- Department of Energy
- MRCAT member institutions
- U.S. Department of Energy (DOE) Office of Science [89233218CNA000001, DENA0003525]
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The strong metal-support interaction (SMSI) of CeO2 on Pt nanoparticles has a significant impact on the catalytic performance for ethylene and propane, leading to high propylene selectivity in Pt nanoparticles covered by SMSI CeO2.
Upon reduction at 975 degrees C, a strong metal-support interaction (SMSI) of CeO2 on Pt NPs leads to low rates for ethylene hydrogenation and propane dehydrogenation, but high olefin selectivity for the latter reaction. By contrast, reduction at 550 degrees C of Pt/CeO2, leads to 5 nm Pt NP's with ethylene hydrogenation and propane dehydrogenation TORs and low olefin selectivity similar to Pt/SiO2. X-ray absorption fine structure (EXAFS) and scanning transmission electron microscopy (STEM) shows formation of -15 nm monometallic Pt nanoparticles partially covered by SMSI CeO2. The propylene selectivity of Pt NP's covered by SMSI CeO2 was -95 % suggesting there were few Pt ensembles capable of catalysing propane hydrogenolysis; while the remaining exposed Pt remain active for dehydrogenation reactions.
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