Journal ArticleDOI
Catalytic dry reforming of methane over high surface area ceria
TLDR
In this article, high surface area ceria (CeO 2) was synthesized by a surfactant-assisted approach, which has useful dry reforming activity for H 2 and CO production under solid oxide fuel cells (SOFCs) conditions.Abstract:
High surface area ceria (CeO 2 (HSA)), synthesized by a surfactant-assisted approach, was found to have useful dry reforming activity for H 2 and CO production under solid oxide fuel cells (SOFCs) conditions. The catalyst provides significantly higher reforming reactivity and excellent resistance toward carbon deposition compared to Ni/Al 2 O 3 and conventional low surface area ceria (CeO 2 (LSA)) under dry reforming conditions. These enhancements are due to the high redox property of CeO 2 (HSA). During the dry reforming process, the redox reactions between the gaseous components in the system and the lattice oxygen (O x ) take place on ceria surface. Among these reactions, the rapid redox reactions of carbon compounds such as CH 4 , and CO with lattice oxygen (CH 4 + O x → CO + H 2 + O x −1 and CO + O x = CO 2 + O x −1 ) can prevent the formation of carbon species from the methane decomposition and Boudard reactions even at low inlet carbon dioxide concentration. In particular, the dry reforming rate over CeO 2 (HSA) is proportional to the methane partial pressure and the operating temperature. Carbon dioxide presents weak positive impact on the methane conversion, whereas both carbon monoxide and hydrogen inhibit the reforming rate. The activation energies and reforming rates under the same methane concentration for CeO 2 toward the dry reforming are almost equal to the steam reforming as previously reported [1–4] . This result suggests the similar reaction mechanisms for both the steam reforming and the dry reforming over CeO 2 ; i.e., the dry reforming rate is governed by the slow reaction of adsorbed methane, or surface hydrocarbon species, with oxygen in CeO 2 , and a rapid gas–solid reaction between CO 2 and CeO 2 to replenish the oxygen.read more
Citations
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Ceria as a catalyst for hydrogen iodide decomposition in sulfur–iodine cycle for hydrogen production
TL;DR: In this paper, a new reaction mechanism for hydrogen iodide (HI) decomposition over CeO 2 catalyst is proposed, and the results show that the CeO2 catalyst synthesized by citric-aided sol-gel method and calcined at low temperature ( 3+ and oxygen vacancy, play the dominant role in surface reactions of HI decomposition.
Journal ArticleDOI
Highly Active and Stable Ni−SiO2 Prepared by a Complex- Decomposition Method for Pressurized Carbon Dioxide Reforming of Methane
Hua-Ping Ren,Yong-Hong Song,Qingqing Hao,Zhong-Wen Liu,Wei Wang,Jian-Gang Chen,Jinqiang Jiang,Zhao-Tie Liu,Zhengping Hao,Zhengping Hao,Jian Lu +10 more
TL;DR: A series of Ni-SiO2 catalysts were synthesized by the complexdecomposition method using different amino acids as complexing agents and fuels and nickel nitrate and tetraethoxysilane as precursors of Ni and SiO2, respectively as mentioned in this paper.
Journal ArticleDOI
Upgrading of vacuum residue with chemical looping partial oxidation over Ce doped Fe2O3
TL;DR: In this paper, a series of Ce doped Fe2O3 materials were prepared and applied for partial oxidation of vacuum residue and the effect of Ce doping on the physicochemical properties of Fe 2O3 was recognized through a seriesof characterization techniques.
Journal ArticleDOI
Medium-Temperature Shift Catalysts for Hydrogen Purification in a Single-Stage Reactor
A. Alijani,Abdullah Irankhah +1 more
TL;DR: In this article, the authors reviewed and discussed catalytic systems for hydrogen purification via medium temperature shift (MTS) reactions in small-scale fuel cells, where Pt-based catalysts on reducible oxide supports, e.g., CeO2 and TiO2, have been used for this reaction.
Journal ArticleDOI
Impact of Ni and Mg Loadings on Dry Reforming Performance of Pt/Ceria-Zirconia Catalysts
TL;DR: In this article, the isolated effects of Ni and Mg on a series of Pt/Ce0.6Zr0.4O2 (CZO) reforming catalysts were evaluated and used to formulate an improved catalyst with both Ni and MG present.
References
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Journal ArticleDOI
The multiple roles for catalysis in the production of H2
TL;DR: A review of the use of catalysis for the current and future production of H2 can be found in this article, where a number of different, largely catalytic approaches for producing H2 are described.