Role of Sn in the Regeneration of Pt/γ-Al 2 O 3 Light Alkane Dehydrogenation Catalysts

Pham, Hien N.; Sattler, Jesper J. H. B.; Weckhuysen, Bert M.; Datye, Abhaya K.

doi:10.1021/acscatal.5b02917

Title: Role of Sn in the Regeneration of Pt/γ-Al ₂ O ₃ Light Alkane Dehydrogenation Catalysts

Journal Article · Fri Apr 01 00:00:00 EDT 2016 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.5b02917· OSTI ID:1242442

Pham, Hien N.; Sattler, Jesper J. H. B.; Weckhuysen, Bert M.; Datye, Abhaya K.

Alumina-supported Pt is one of the major industrial catalysts for light alkane dehydrogenation. This catalyst loses activity during reaction, with coke formation often considered as the reason for deactivation. As we show in this study, the amount and nature of carbon deposits do not directly correlate with the loss of activity. Rather, it is the transformation of subnanometer Pt species into larger Pt nanoparticles that appears to be responsible for the loss of catalytic activity. Surprisingly, a portion of the Sn remains atomically dispersed on the alumina surface in the spent catalyst and helps in the redispersion of the Pt. In the absence of Sn on the alumina support, the larger Pt nanoparticles formed during reaction are not redispersed during oxidative regeneration. It is known that Sn is added as a promoter in the industrial catalyst to help in achieving high propene selectivity and to minimize coke formation. This work shows that an important role of Sn is to help in the regeneration of Pt, by providing nucleation sites on the alumina surface. Finally aberration-corrected scanning transmission electron microscopy helps to provide unique insights into the operating characteristics of an industrially important catalyst by demonstrating the role of promoter elements, such as Sn, in the oxidative regeneration of Pt on γ-Al₂O₃.

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Research Organization:: Univ. of New Mexico, Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER15712

OSTI ID:: 1242442

Alternate ID(s):: OSTI ID: 1345034

Journal Information:: ACS Catalysis, Journal Name: ACS Catalysis Vol. 6; ISSN 2155-5435

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 171 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
coking
nucleation sites
oxidative regeneration
propane dehydrogenation
Pt-Sn/γ-Al2O3
Pt/γ-Al2O3
sintering
STEM/HRTEM

Title: Role of Sn in the Regeneration of Pt/γ-Al 2 O 3 Light Alkane Dehydrogenation Catalysts

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Title: Role of Sn in the Regeneration of Pt/γ-Al ₂ O ₃ Light Alkane Dehydrogenation Catalysts