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Roh, Hyun Seog; Jun, Kil-Woung; Baek, Seung Chan; Park, Sang Eon

doi:10.1023/a:1016531018819

Cited by 52 publications

(23 citation statements)

References 12 publications

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“…As a consequence, sintering of active sites may be avoided resulting in stability during the reaction. It is also reported that the free NiO species, which has no interaction with support, is responsible for coke formation in CRM [18,19].…”

Section: Reaction Resultsmentioning

confidence: 99%

Combined reforming of methane over supported Ni catalysts

et al. 2007

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Various supported Ni catalysts have been applied for combined steam and carbon dioxide reforming of methane to produce synthesis gas (H 2 /CO = 2). Highly active and stable nano-sized Ni/Mgo-Al 2 O 3 catalyst has been successfully developed for the target reaction. The high activity and stability is due to beneficial effects of MgO such as enhanced steam adsorption, basic property, nano-sized NiO crystallite size and strong interaction between Ni and support.

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Section: Reaction Resultsmentioning

confidence: 99%

Combined reforming of methane over supported Ni catalysts

et al. 2007

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“…These supports are compared with the conventional one like h-Al 2 O 3 , which was first adopted in the phase of c-Al 2 O 3 and transformed to h-Al 2 O 3 phase by calcining at 850°C reported in our previous work [7,8,13]. The SCR catalyst in the present study is prepared by impregnation method using metal precursors of Ni(NO 3 ) 2 Á6H 2 O (98%, Samchun) and Ce(CH 3 COO) 3 ÁxH 2 O (99.9%, Aldrich) with an aqueous solution.…”

Section: Catalyst Preparation and Activity Testmentioning

confidence: 99%

“…Therefore, both interactions of Ni-MgO and Ni-CeO 2 possibly affect the different reduction behaviors on SCR catalyst. Even though the strong-interaction in metal-support is responsible for the difficult reduction behavior, these characters are also beneficial for suppressing the aggregation of active metals [13,[24][25][26]. Interestingly, the degree of reduction on NCMA(x) catalysts decreased with the increase of MgO/ Al 2 O 3 weight ratio in MgAl 2 O 4 support from 63.4 to 23.3%, which significantly reveals an enhanced interaction of nickel particle and MgAl 2 O 4 support.…”

Section: Surface Area Dispersion and Particle Size Of Nickel Speciesmentioning

confidence: 99%

“…It is well known that the role of CeO 2 component on nickel-based reforming catalyst is to enhance the catalytic activity with low coke formation during reforming reaction by easily donating lattice oxygen due to its high oxygen capacity [13,25,26]. Therefore, the mobile oxygen was also measured by adsorbing CO 2 (mmolO 2 /g cat ) on the reduced SCR catalyst and compared with MgAl 2 O 4 support itself.…”

Section: The Roles Of Ceo 2 Promoter To the Suppressed Aggregation Ofmentioning

confidence: 99%

“…In our previous study on CDR reaction [7,13], we have reported that Ce-ZrO 2 is very effective promoters for Ni/h-Al 2 O 3 catalytic system with a significant suppression of coke deposition and resulted in showing high catalytic stability. The high catalytic stability in CDR on that catalyst is mainly attributed to the efficient pre-coating effect of Ce-ZrO 2 on h-Al 2 O 3 support with a high oxygen capacity of CeO 2 component.…”

Section: Introductionmentioning

confidence: 99%

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Combined Steam and Carbon Dioxide Reforming of Methane on Ni/MgAl2O4: Effect of CeO2 Promoter to Catalytic Performance

et al. 2010

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The catalytic performance during combined steam and carbon dioxide reforming of methane (SCR) was investigated on Ni/MgAl 2 O 4 catalyst promoted with CeO 2 . The SCR catalyst was prepared by co-impregnation method using nickel and cerium metal precursors on hydrotalcitelike MgAl 2 O 4 support. In terms of catalytic activity and stability, CeO 2 -promoted Ni/MgAl 2 O 4 catalyst is superior to Ni-CeO 2 /Al 2 O 3 or Ni/MgAl 2 O 4 catalysts because of high resistance to coke formation and suppressed aggregation of nickel particles. The role of CeO 2 on Ni/MgAl 2 O 4 catalyst was elucidated by carrying out the various characterization methods in the viewpoint of the aggregation of nickel particles and metal-support interactions. The observed superior catalytic performance on CeO 2 -promoted Ni/MgAl 2 O 4 catalyst at the weight ratio of MgO/Al 2 O 3 of 3/7 seems to be closely related to high dispersion and low aggregation of active metals due to their strong interaction with the MgAl 2 O 4 support and the adjacent contact of Ni and CeO 2 species. The CeO 2 promoter also plays an important role to suppress particle aggregation by forming an appropriate interaction of NiO-CeO 2 as well as Ni-MgAl 2 O 4 with the concomitant enhancement of mobile oxygen content.

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Dry Reforming of Methane with a Ni/Al₂O₃‐YSZ Catalyst: The Role of the Catalyst Preparation Protocol

et al. 2007

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Many studies of Ni based ceramic supporting reforming catalysts are found in the literature. A synthesis of the reported results shows that their efficiency and durability are significantly affected by their fabrication protocol. This research has been aimed at evaluating how the conditions of 1) the ceramic support preparation and 2) the Ni deposition, through an impregnation‐drying‐calcination‐reduction protocol, affect the catalytic activity and the catalyst deactivation over time during methane dry reforming. The catalyst support used in this study was obtained by the mixing and pressing of alumina and YSZ (Yttria Stabilized Zirconia) powders, then calcining the mixtures at high temperature to form pellets of limited porosity (specific surface of 1.5‐10 m2/g), without inducing change to the crystalline phases. The results show that the surface density of the nickel particles, the catalyst activity, and its life span are highly dependent upon the catalyst preparation protocol. The initial nitrate solution concentration, the duration of the impregnation and the specific surface of the ceramic support have, all of them, a considerable influence on the size range of the deposited nickel particles. The surface density, the amount and the size of the latter highly affect the catalytic activity. It has been also shown that an increase in the ratio CH4/CO2 is detrimental to the catalytic activity of the tested formulations; a small excess of methane is enough to initiate the deactivation process of the catalyst very quickly for all of the composition tested in this study. A phenomenological deactivation kinetics model has been built and optimized. Although there are differences in deactivation rates among the different formulations tested, the model shows that the deactivation rate is highly dependent upon the reaction rate constant and that zero‐ and first‐order kinetics give statistically the same prediction error; the latter is always lower or equal to the experimental error.

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Cited by 52 publications

References 12 publications

Combined reforming of methane over supported Ni catalysts

Combined reforming of methane over supported Ni catalysts

Combined Steam and Carbon Dioxide Reforming of Methane on Ni/MgAl2O4: Effect of CeO2 Promoter to Catalytic Performance

Dry Reforming of Methane with a Ni/Al₂O₃‐YSZ Catalyst: The Role of the Catalyst Preparation Protocol

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Untitled

Cited by 52 publications

References 12 publications

Combined reforming of methane over supported Ni catalysts

Combined reforming of methane over supported Ni catalysts

Combined Steam and Carbon Dioxide Reforming of Methane on Ni/MgAl2O4: Effect of CeO2 Promoter to Catalytic Performance

Dry Reforming of Methane with a Ni/Al2O3‐YSZ Catalyst: The Role of the Catalyst Preparation Protocol

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Dry Reforming of Methane with a Ni/Al₂O₃‐YSZ Catalyst: The Role of the Catalyst Preparation Protocol