Relationship between the Zirconia-Promoted Reduction in the Rh-Loaded Ce0.5Zr0.5O2Mixed Oxide and the Zr–O Local Structure

Vlaic, G.; Fornasiero, Paolo; Geremia, Silvano; Kašpar, Jan; Graziani, M.

doi:10.1006/jcat.1997.1644

Cited by 197 publications

(154 citation statements)

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“…Further addition of ZrO 2 to CeO 2 improved the coke removal ability of CeO 2 [99]. Presence of ZrO 2 increases the O 2 mobility in the CeO 2 lattice and increases the process of vacancy formation, making the material more reducible [100][101][102] and reduction is no longer confined to the surface but extends deep into the bulk [103,104]. The composition of the binary oxide impacts the OSC.…”

mentioning

confidence: 99%

Recent Advances in Hydrogen Production Via Autothermal Reforming Process (ATR): A Review of Patents and Research Articles

Nahar¹,

Dupont²

2013

CHENG

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Abstract:This review examines recent patents and research articles in autothermal reforming (ATR) of fossil fuels like gasoline, diesel, JP-8 along with renewable fuels such as methanol, ethanol, glycerol, butanol, bio-oils and biodiesel into H 2 gas. The focus of the research was the recent developments in terms of ATR reformer design, ATR fuel processors, reformer start up, and reforming catalysts to determine the opportunities for R&D in this area. The production of H 2 by ATR of fossil fuels has been widely investigated; several catalytic studies based on various noble and non-precious metals like Rh and Ni are available, restricting new investigations. In contrast, H 2 production from bio feedstock like bio-oils, biodiesel, ethanol, and butanol are very recent and offer considerable room for further investigation..

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confidence: 99%

Recent Advances in Hydrogen Production Via Autothermal Reforming Process (ATR): A Review of Patents and Research Articles

Nahar¹,

Dupont²

2013

CHENG

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“…As per the literature reports, this band further reveals the presence of t phase, which could not be identified by XRD. The presence of this phase is expected to improve the catalytic performance of this solid solution [28,29]. The presence of this band and more intense band at 605 cm 1 has also clearly reflected in its enhanced oxygen vacancy concentration as determined by the OSC measurements ( Table 1).…”

Section: Resultsmentioning

confidence: 95%

Synthesis of Nanosized Ceria-Zirconia Solid Solutions by a Rapid Microwave-Assisted Combustion Method

Reddy¹,

Reddy²,

Reddy³

et al. 2009

TOPCJ

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By adopting a simple cost effective microwave-assisted synthesis methodology, nanosized ceria-zirconia solid solution (MW) has been prepared. For comparison purpose, ceria-zirconia solid solution with the same composition was also synthesized by a coprecipitation method (CP) and calcined at 773 K. Both the samples were examined by different characterization techniques namely, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, BET surface area and other methods, and evaluated for CO oxidation activity. XRD studies revealed formation of monophasic Ce 0.5 Zr 0.5 O 2 solid solution in the MW sample and Ce 0.75 Zr 0.25 O 2 solid solution in the CP sample. TEM studies showed the presence of nanometre sized particles with broad particle size distribution in the sample prepared by microwave method. Raman spectroscopy and oxygen storage capacity measurements suggested the presence of more oxygen vacancies and lattice defects in the MW sample. XPS studies indicated a high reducibility and surface enrichment of Ce 3+ ions in the MW sample. Higher CO oxidation activity and lower light off temperature was observed for the microwave synthesized sample in comparison to that of coprecipitated sample.

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“…In addition, incorporation of Zr also increases the oxygen mobility in the ceria lattice and the process of vacancy formation, thus increasing the reducibility of the material [33,37,38]. This extends ceria reduction deep into the bulk of the material, rather than confining to the surface [34,39].…”

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confidence: 98%

“…Incorporation of Zr increases the specific surface area, OSC, redox property, thermal stability and catalytic activity of ceria [33][34][35]. It also affects the dispersion of metals supported on the Zr doped ceria.…”

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Hydrogen production from simple alkanes and oxygenated hydrocarbons over ceria–zirconia supported catalysts: Review

Nahar

Dupont

2014

Renewable and Sustainable Energy Reviews

102

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The use of ceria-zirconia based catalysts in hydrogen production from simple alkanes and oxygenated hydrocarbons for the processes of steam reforming (SR), autothermal reforming ('ATR'), catalytic partial oxidation ('CPO'), and dry reforming ('DR') are reviewed in this paper. Along with preparation methods, the effects of operating conditions like molar steam to carbon ratio, oxygen to carbon ratio, and temperature on the performance of hydrogen production from methane, acetic acid, ethanol, and glycerol were examined. SR and ATR of these feedstocks over ceria-zirconia supports have been widely investigated. In comparison the utilization of these supports in the CPO and DR processes has been investigated mainly for methane as compared to oxygenated hydrocarbons. Ce-rich supports were reported to be effective in hydrogen from SR and ATR of ethanol and glycerol and in SMR in the 'low' temperature range (500-600 °C), whereas zirconium-rich supports exhibited higher catalytic activity in the 'high' temperature range (700-800 °C). In the case of DR, Ce-rich supports were effective at high temperature. The methods of preparation of the supports/catalyst are shown to affect the surface area (catalyst/support), crystallite size of (active metal/support), reducibility and dispersion of the active metal, thus affecting performance of the catalyst.

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Relationship between the Zirconia-Promoted Reduction in the Rh-Loaded Ce0.5Zr0.5O2Mixed Oxide and the Zr–O Local Structure

Cited by 197 publications

References 0 publications

Recent Advances in Hydrogen Production Via Autothermal Reforming Process (ATR): A Review of Patents and Research Articles

Recent Advances in Hydrogen Production Via Autothermal Reforming Process (ATR): A Review of Patents and Research Articles

Synthesis of Nanosized Ceria-Zirconia Solid Solutions by a Rapid Microwave-Assisted Combustion Method

Hydrogen production from simple alkanes and oxygenated hydrocarbons over ceria–zirconia supported catalysts: Review

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