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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Journal ArticleDOI
Effects of support and co-fed elements on steam reforming of palm fatty acid distillate (PFAD) over Rh-based catalysts
TL;DR: In this paper, the steam reformings of palm fatty acid distillate (PFAD) over Rh on MgO-Al2O3, Al 2O3 and Ce-ZrO2 (with Ce/Zr ratios of 3/1, 1/1 and 1/3) supports were studied.
Journal ArticleDOI
Comparative study on cubic and tetragonal Ce x Zr 1-x O 2 supported MoO 3 -catalysts for sulfur-resistant methanation
TL;DR: In this paper, two kinds of Ce x Zr 1-x O 2 solid solution carriers with different Ce/Zr ratio were prepared by one-step co-precipitation method.
Journal ArticleDOI
Tailored Ce- and Zr-doped Ni/hydrotalcite materials for superior sorption-enhanced steam methane reforming
TL;DR: In this article, modified Ni/hydrotalcite-like (HTlc) hybrid materials promoted with Ce and Zr species were synthesized and applied for the sorptionenhanced steam methane reforming process (or SESMR).
Journal ArticleDOI
Ceria-Based Catalysts for Selective Hydrogenation Reactions: A Critical Review
Kourosh Razmgar,Mohammednoor Altarawneh,Mohammednoor Altarawneh,Ibukun Oluwoye,Gamini Senanayake +4 more
TL;DR: In this article, a review of studies focusing on the performance of ceria in selective catalytic hydrogenation is presented, highlighting the theoretical basis and importance of non-stoichiometric forms of Ceria (CeO2-x).
Journal ArticleDOI
Catalytic H2O and CO2 reforming of CH4 over perovskite-based La0.8Sr0.2Cr0.9Ni0.1O3: Effects of pre-treatment and co-reactant/CH4 on its reforming characteristics
C. Chettapongsaphan,C. Chettapongsaphan,Sumittra Charojrochkul,Suttichai Assabumrungrat,Navadol Laosiripojana +4 more
TL;DR: In this article, the H2O and CO2 reformings of CH4 over perovskite-based La08Sr02Cr09Ni01O3 were studied under solid oxide fuel cell (SOFC) conditions.
References
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