Promoting the Selectivity of Pt/m-ZrO2 Ethanol Steam Reforming Catalysts with K and Rb Dopants

Martinelli, Michela; Garcia, Richard; Watson, Caleb D.; Cronauer, Donald C.; Kropf, A. Jeremy; Jacobs, Gary

doi:10.3390/nano11092233

Promoting the Selectivity of Pt/m-ZrO₂ Ethanol Steam Reforming Catalysts with K and Rb Dopants

Journal Article · Sun Aug 29 00:00:00 EDT 2021 · Nanomaterials

DOI:https://doi.org/10.3390/nano11092233· OSTI ID:1818067

Martinelli, Michela ^[1]; Garcia, Richard ^[2]; ^[2]; Cronauer, Donald C. ^[3]; ^[3]; Jacobs, Gary ^[2]

Univ. of Kentucky, Lexington, KY (United States)
Univ. of Texas at San Antonio, TX (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

The ethanol steam reforming reaction (ESR) was investigated on unpromoted and potassium- and rubidium-promoted monoclinic zirconia-supported platinum (Pt/m-ZrO₂) catalysts. Evidence from in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) characterization indicates that ethanol dissociates to ethoxy species, which undergo oxidative dehydrogenation to acetate followed by acetate decomposition. The acetate decomposition pathway depends on catalyst composition. The decarboxylation pathway tends to produce higher overall hydrogen selectivity and is the most favored route at high alkali loading (2.55 wt.% K and higher or 4.25 wt.% Rb and higher). On the other hand, decarbonylation is a significant route for the undoped catalyst or when a low alkali loading (e.g., 0.85% K or 0.93% Rb) is used, thus lowering the overall H₂ selectivity of the process. Results of in situ DRIFTS and the temperature-programmed reaction of ESR show that alkali doping promotes forward acetate decomposition while exposed metallic sites tend to facilitate decarbonylation. In previous work, 1.8 wt.% Na was found to hinder decarbonylation completely. Due to the fact that 1.8 wt.% Na is atomically equivalent to 3.1 wt.% K and 6.7 wt.% Rb, the results show that less K (2.55% K) or Rb (4.25% Rb) is needed to suppress decarbonylation; that is, more basic cations are more efficient promoters for improving the overall hydrogen selectivity of the ESR process.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Science Foundation (NSF); USDA; USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1818067

Journal Information:: Nanomaterials, Journal Name: Nanomaterials Journal Issue: 9 Vol. 11; ISSN 2079-4991

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Promoting the Selectivity of Pt/m-ZrO2 Ethanol Steam Reforming Catalysts with K and Rb Dopants

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Promoting the Selectivity of Pt/m-ZrO₂ Ethanol Steam Reforming Catalysts with K and Rb Dopants