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Title: Hydrogen production over Ni/ceria-supported catalysts by partial oxidation of methane

Abstract

The catalytic performance of Ni dispersed on ceria-doped supports, (Ce0.88La0.12) O2-x, (Ce0.91Gd0.09) O2-x, (Ce0.71Gd0.29) O2-x, (Ce0.56Zr0.44) O2-x and pure ceria, was tested for the catalytic partial oxidation of Methane (CPOX). The catalysts were characterized by Brunauer Emmett Teller (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR) and temperature programmed oxidation (TPO). Ni/ (Ce0.56Zr0.44) O2-x showed higher Hydrogen production than the Ni/Gadolinium-doped catalysts, which may be due to its higher reducibility and surface area. By enhancing the support reducibility in Ni/dopedceria catalysts, their catalytic activity is promoted because the availability of surface lattice oxygen is increased, which can participate in the formation of CO and H2. It was also found that Ni/(Ce0.56Zr0.44) O2-x showed higher catalytic performance after redox pretreatments. Similarly, a higher amount of H2 or O2 was consumed during hydrogenation and oxidation pretreatments, respectively. This may be correlated to re-dispersion of metallic particles and changes on the metal-support interface. In addition, it was observed that the ionic conductivity of Ni/(Ce0.56Zr0.44) O2-x had an effect on the amount of carbon formed during the CPOX reaction at oxygen concentrations lower than the stoichiometric required, O/C ratios lower than 0.6. Its high oxygen mobility may have accelerated the surface oxidation reactions ofmore » carbon by reactive oxygen species, thus, inhibiting carbon growth on the catalyst surface« less

Authors:
;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research; National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Fossil Energy (FE)
OSTI Identifier:
1012924
Report Number(s):
netltpr-2734
Resource Type:
Journal Article
Journal Name:
INTERNATIONAL JOURNAL OF HYRDROGEN ENERGY
Additional Journal Information:
Journal Volume: 34; Journal Issue: 24
Country of Publication:
United States
Language:
English
Subject:
Partial oxidation of methane Redox treatment Nickel Ceria Temperature programmed oxidation

Citation Formats

Salazar, Villalpando MD, and B, Reyes. Hydrogen production over Ni/ceria-supported catalysts by partial oxidation of methane. United States: N. p., 2009. Web. doi:10.1016/j.ijhydene.2009.10.019.
Salazar, Villalpando MD, & B, Reyes. Hydrogen production over Ni/ceria-supported catalysts by partial oxidation of methane. United States. doi:10.1016/j.ijhydene.2009.10.019.
Salazar, Villalpando MD, and B, Reyes. Tue . "Hydrogen production over Ni/ceria-supported catalysts by partial oxidation of methane". United States. doi:10.1016/j.ijhydene.2009.10.019.
@article{osti_1012924,
title = {Hydrogen production over Ni/ceria-supported catalysts by partial oxidation of methane},
author = {Salazar, Villalpando MD and B, Reyes},
abstractNote = {The catalytic performance of Ni dispersed on ceria-doped supports, (Ce0.88La0.12) O2-x, (Ce0.91Gd0.09) O2-x, (Ce0.71Gd0.29) O2-x, (Ce0.56Zr0.44) O2-x and pure ceria, was tested for the catalytic partial oxidation of Methane (CPOX). The catalysts were characterized by Brunauer Emmett Teller (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR) and temperature programmed oxidation (TPO). Ni/ (Ce0.56Zr0.44) O2-x showed higher Hydrogen production than the Ni/Gadolinium-doped catalysts, which may be due to its higher reducibility and surface area. By enhancing the support reducibility in Ni/dopedceria catalysts, their catalytic activity is promoted because the availability of surface lattice oxygen is increased, which can participate in the formation of CO and H2. It was also found that Ni/(Ce0.56Zr0.44) O2-x showed higher catalytic performance after redox pretreatments. Similarly, a higher amount of H2 or O2 was consumed during hydrogenation and oxidation pretreatments, respectively. This may be correlated to re-dispersion of metallic particles and changes on the metal-support interface. In addition, it was observed that the ionic conductivity of Ni/(Ce0.56Zr0.44) O2-x had an effect on the amount of carbon formed during the CPOX reaction at oxygen concentrations lower than the stoichiometric required, O/C ratios lower than 0.6. Its high oxygen mobility may have accelerated the surface oxidation reactions of carbon by reactive oxygen species, thus, inhibiting carbon growth on the catalyst surface},
doi = {10.1016/j.ijhydene.2009.10.019},
journal = {INTERNATIONAL JOURNAL OF HYRDROGEN ENERGY},
number = 24,
volume = 34,
place = {United States},
year = {2009},
month = {12}
}