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Title: Role of Sn in the regeneration of Pt/γ-Al 2O 3 light alkane dehydrogenation catalysts

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,more » such as Sn, in the oxidative regeneration of Pt on γ-Al 2O 3.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Univ. of New Mexico, Albuquerque, NM (United States)
  2. Utrecht Univ., Utrecht (The Netherlands)
Publication Date:
OSTI Identifier:
1242442
Grant/Contract Number:
FG02-05ER15712
Type:
Published Article
Journal Name:
ACS Catalysis
Additional Journal Information:
Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2155-5435
Publisher:
American Chemical Society (ACS)
Research Org:
Univ. of New Mexico, Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; coking; nucleation sites; oxidative regeneration; propane dehydrogenation; Pt-Sn/γ-Al2O3; Pt/γ-Al2O3; sintering; STEM/HRTEM