Methanol reforming by nanostructured Pd/Sm-doped ceria catalysts

Methanol reforming by nanostructured Pd/Sm-doped ceria catalysts

[Display omitted] •Pd/Sm-Doped Ceria (SDC) catalysts prepared with high purity, nanostructured supports.•Highly dispersed Pd achieved in catalysts made by impregnation of pre-prepared SDC.•Catalyst activities interpreted in terms of nanostructure-performance relationships.•Impregnation from Pd(NO3)3...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Vol. 286; p. 119935
Main Authors: Kosinski, M.R., Vizcaíno, A.J., Gómez-Sainero, L.M., Carrero, A., Baker, R.T.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 05-06-2021
Elsevier BV
Subjects:
Carbon dioxide
Catalysts
Catalytic activity
Cerium oxides
Citric acid
Hydrogen production
Impregnation
Methanol
Methanol reforming
Nanoparticles
Palladium
Reforming
Samarium
Samarium-doped ceria
Selectivity
XPS
Samarium-doped ceria
Palladium
XPS
Methanol reforming
Hydrogen production
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Summary:[Display omitted] •Pd/Sm-Doped Ceria (SDC) catalysts prepared with high purity, nanostructured supports.•Highly dispersed Pd achieved in catalysts made by impregnation of pre-prepared SDC.•Catalyst activities interpreted in terms of nanostructure-performance relationships.•Impregnation from Pd(NO3)3 resulted in the most active methanol reforming catalysts.•Methanol conversions and H2 yields of up to 97.4 % and 236 %, respectively, achieved. Catalysts of 2 wt% Pd/Sm-doped Ceria (SDC) were prepared and evaluated for hydrogen production by methanol reforming. Three preparation methods were used: a one-step method in which formation of the SDC phase and Pd incorporation took place in a single citrate-complexation process (Method A); impregnation of pre-prepared SDC nanopowder supports using Pd(NO3)2 solution (Method B); and impregnation of pre-prepared SDC from H2PdCl4 solution (Method C). Both methanol conversion and hydrogen yield increased as: bare supports<<Method A < Method C < Method B, the latter achieving values of up to 97.4 % and 236.2 %, respectively. Pd was well dispersed as fine nanoparticles by Methods B and C, but larger particles were resolved for Method A. Method B resulted in a high surface concentration of Pd, further improving catalytic activity. Undesirable Cl was retained in samples of Method C. Method B resulted in catalysts with superior nanostructure, resulting in the best activity and CO2 selectivity.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.119935