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Effect of sodium loading on Pt/ZrO2 during ethanol steam reforming

Journal Article · · Applied Catalysis. A, General
 [1];  [2];  [3];  [4];  [5];  [5];  [3]
  1. Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
  2. Univ. of Texas at San Antonio, TX (United States); John Jay Science and Engineering Academy, San Antonio, TX (United States)
  3. Univ. of Texas at San Antonio, TX (United States)
  4. Univ. of Texas at San Antonio, TX (United States); Samuel V. Champion High School, Boerne, TX (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)

Ethanol steam reforming (ESR) was investigated on unpromoted and several sodium promoted Pt/ZrO2 catalysts. From DRIFTS experiments, the following steps during ESR were inferred: dissociation of ethanol to produce ethoxy species; oxidative dehydrogenation of ethoxy species to acetate; and acetate decomposition. Acetate decomposition depends on the catalyst formulation. Decarboxylation is the most favored route at high sodium loading (2.5 and 5 wt.%); acetate decomposes in the forward direction to CH4 and a carbonate, which further decomposes to CO2. In contrast, decarbonylation is prevalent for the unpromoted catalyst or catalysts having low sodium loading. Furthermore, acetate likely decomposes to CH3OH and CO. Adsorbed methanol may undergo further steam reforming by oxidative dehydrogenation to formate species, which decarbonylates via reverse decomposition to CO and H2O. Temperature programmed desorption/reaction and activity data confirmed that alkali promotion, especially at 1.8 %Na and higher loading, facilitates the forward acetate decomposition step, favoring decarboxylation over decarbonylation.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1829997
Journal Information:
Applied Catalysis. A, General, Journal Name: Applied Catalysis. A, General Vol. 610; ISSN 0926-860X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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