A Plate-Type Anodic Alumina Supported Nickel Catalyst for Methane Steam Reforming

Lu, Zhou; Guo, Yu; Zhang, Qi; Tran, Thanh Phong; Sakurai, Makoto; Kameyama, Hideo

doi:10.1252/jcej.07we182

Cited by 20 publications

(4 citation statements)

References 32 publications

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“…The pore closing, the diffusion of the residual Al and the phase transition to α-Al 2 O 3 at high temperature were suggested to be main interpretations for this decrease. However, our previous research showed that the phase transition to α-Al 2 O 3 was not observed in an EHAC catalyst support calcined at 1073 K with XRD (Zhou et al, 2007). Moreover, the decrease in its BET surface area at 1073 K was found that it mainly occurred in the initial 1 h and then the decline speed gradually slowed to near to an approximately stable state after ca.…”

Section: The Calcination Effect On the Bet Surface Areamentioning

confidence: 89%

“…10 h, as shown in Table 4. In addition, our recent research showed that an EAHC supported Ni catalyst with Ni loading of 17.9 wt% gave a high and stable SMR activity for 200 h at 1073 K, and no remarkable decline in reactivity was observed (Zhou et al, 2007). Therefore, though the BET surface area is decreased with increasing the calcination temperature, the application of this EAHC catalyst support at high temperature is still considered to be a promising area at least at 1073 K.…”

Section: The Calcination Effect On the Bet Surface Areamentioning

confidence: 98%

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Anodic Alumina Catalyst Support with High Heat-Resistance for Hydrocarbon Steam Reformers

Tran

Guo

et al. 2007

J. Chem. Eng. Japan

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To improve the heat resistance of the conventional alumite catalyst, a commercial Al/Fe-Cr-Alloy/Al clad base material was used to prepare a plate-type clad alumite support with high resistance.The pre-heat treatment of the base material at 773 K for 3 h or longer has a significant inhibitory on the alumina layer shelling off, due to the formation of the interfacial alloy diffusion layer. The pore widening treatment at 293 K for 8 h provided an excellent alumite support that was enough strong to suffer the high temperature of 1273 K without the alumina layer shelling off. No alumina layer was found to shell from the alloy layer after 5000 times' repeat electrically heating shock test. Though the BET surface area was decreased with increasing the calcination temperature, the application of this EAHC catalyst at high temperature is still considered to be a promising area at least at 1073 K.

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Section: The Calcination Effect On the Bet Surface Areamentioning

confidence: 89%

Section: The Calcination Effect On the Bet Surface Areamentioning

confidence: 98%

Anodic Alumina Catalyst Support with High Heat-Resistance for Hydrocarbon Steam Reformers

Tran

Guo

et al. 2007

J. Chem. Eng. Japan

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“…That is, the increased Ni particle size to some extent was favorable to the formation of the steric-structure. Upon these results, our recent research showed that a new Ni/Al 2 O 3 /Alloy catalyst with a high Ni loading of 17.9 wt%, which was prepared by a double impregnation method and was calcined at a high temperature after the first impregnation with an aim to produce a effective interfacial NiAl 2 O 4 layer, gave a high and stable SMR activity for 1000 h at 973 K after the first H 2 reduction (Zhou et al, 2007). In Figure 3(b), a ROR treated catalyst (H 2 Reduction → air Oxidation → H 2 re-Reduction) also gave a high and stable SMR reactivity after the second H 2 reduction.…”

Section: Activation Treatmentsmentioning

confidence: 95%

Steam Methane Reforming Using an Anodic Alumina Supported Nickel Catalyst (Ni/Al2O3/Alloy): Analysis of Catalyst Deactivation

Guo

Tran

et al. 2007

J. Chem. Eng. Japan

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A plate-type metal-monolithic anodic alumina supported nickel catalyst (Ni/Al 2 O 3 /Alloy) was employed to investigate the reactivity and the catalyst deactivation in the SMR reaction, and several methods of activation treatments were proposed. After H 2 reduction, a fresh Ni/Al 2 O 3 /Alloy catalyst only provided a short-term SMR activity, and then quickly deactivated. The oxidation of metallic nickel with steam into oxidation state was believed to be the most serious reason for the catalyst deactivation. After the second H 2 reduction, a deactivated catalyst (or a catalyst with the treatments of H 2 reduction and subsequent air oxidation) was observed to provide a more favorable SMR stability, compared a reduced fresh catalyst.

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“…Additionally, it is also important to prepare an individual structured catalyst that is appropriate for each reactor like the desulfurizer, the steam reformer and the CO remover etc., that compose the reforming process. The wash coat method [4][5][6][7][8][9][10][11][12] and the immersion method [13][14][15][16][17] have been reported so far as the preparing method of the structured catalysts. In each method, many attempts that enlarge a specific surface area and a TOF of active site for the catalyst were performed respectively.…”

Section: Introductionmentioning

confidence: 99%

Structured Catalysts Prepared by Electroless Plating Technique onto a Metal Substrate, for a Wall-Type Hydrogen Production System

Fukuhara

Igarashi

2012

Catal Surv Asia

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This article reviews our works on the structured catalysts for a wall-type hydrogen production system including methanol steam reforming (MSR), CO shift reaction (CO SR) and methanol decomposition (MD). The structured catalysts were copper-based, palladium-based and nickel-based catalysts. Such a series of structured catalysts were prepared by the electroless plating technique that is a novel method for preparing a structured type catalyst onto a metal-substrate. The copper-based catalyst exhibited high performance for MSR and CO SR, the palladium-based catalyst high for MSR, and the nickelbased catalyst high for MD. The catalytic properties of these catalysts were affected by the difference of the plating condition and the pretreatment condition prior to the reaction. In the copper-based catalyst, the reforming and shift activities were enhanced by the oxidation treatment. One of the factors of such activity enhancement by the oxidation was thought to be in close proximity existence of copper and zinc atoms. A lot of monodentate-type formate species having high reactivity was formed on the oxidized catalyst, which would be correlated to the activity enhancement. In the palladium-based catalyst, the reforming activity was improved by the continuous reduction treatment followed by the oxidation. Such continuous pretreatment formed the PdZn alloy species thought to be a reforming site in the surface layer. The decomposition performance of the nickel-based catalyst depended on the ratio of the crystallite size of nickel particles to that of aluminum particles. The electronic influence of zinc and phosphorous components incorporated in the plated layer contributed to the improvement of the selectivity of product.

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A Plate-Type Anodic Alumina Supported Nickel Catalyst for Methane Steam Reforming

Cited by 20 publications

References 32 publications

Anodic Alumina Catalyst Support with High Heat-Resistance for Hydrocarbon Steam Reformers

Anodic Alumina Catalyst Support with High Heat-Resistance for Hydrocarbon Steam Reformers

Steam Methane Reforming Using an Anodic Alumina Supported Nickel Catalyst (Ni/Al2O3/Alloy): Analysis of Catalyst Deactivation

Structured Catalysts Prepared by Electroless Plating Technique onto a Metal Substrate, for a Wall-Type Hydrogen Production System

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