Partial oxidation of methane over Ni catalysts based on hexaaliminate- or perovskite-type oxides

Utaka, Toshimasa; Aldrees, Saud; Ueda, Jun; Iwasa, Yasuyuki; Takeguchi, Tatsuya; Kikuchi, Ryuji; Eguchi, Koichi

doi:10.1016/s0926-860x(03)00129-7

Cited by 47 publications

(32 citation statements)

References 22 publications

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“…The catalytic activity of such mixed-oxide perovskites can be greatly improved by partial substitution of the cations in the A-and/or Bsites. Moreover, the B-site cations may be partially reduced to form finely dispersed metallic species supported on the A-site cation oxide, which makes these materials ideal catalyst precursors for a range of reactions involving metals as active sites (Parvary et al, 2001;Utaka et al, 2003;Goldwasser et al, 2003;Pietri et al, 2001). Cations A and B may be partially substituted by A' and B', respectively (A x A' 1−x B y B' 1−y O 3 ), and perovskites may have other stoichiometries or can be deficient in oxygen under well-defined conditions.…”

Section: Introductionmentioning

confidence: 99%

Studies on mixed metal oxides solid solutions as heterogeneous catalysts

Arandiyan

Parvari

2009

Braz. J. Chem. Eng.

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-In this work, a series of perovskite-type mixed oxide LaMo x V 1−x O 3+δ powder catalysts (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0, with 0.5 < δ < 1.5), prepared by the sol-gel process and calcined at 750°C, provide an attractive and effective alternative means of synthesizing materials with better control of morphology. Structures of resins obtained during the gel formation process by FT-IR spectroscopy and XRD analysis showed that all the LaMo x V 1-x O 3+δ samples are single phase perovskite-type solid solutions. The surface area (BET) between 2.5 -5.0 m 2 /g (x = 0.1 and 1.0 respectively) increases with increasing Mo ratio in the samples. They show high purity, good chemical homogeneity, and lower calcinations temperatures as compared with the solid-state chemistry route. SEM coupled to EDS and thermogravimetric analysis/differential thermal analyses (TGA/DTA) have been carried out in order to evaluate the homogeneity of the catalyst. Finally, the experimental studies show that the calcination temperature and Mo content exhibited a significant influence on catalytic activity. Among the LaMo x V 1-x O 3+δ samples, LaMo 0.7 V 0.3 O 4.2 showed the best catalytic activity for the topic reaction and the best activity and stability for ethane reforming at 850°C under 8 bar.

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Section: Introductionmentioning

confidence: 99%

Studies on mixed metal oxides solid solutions as heterogeneous catalysts

Arandiyan

Parvari

2009

Braz. J. Chem. Eng.

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“…It is of great importance to produce hydrogen for polymer electrolyte fuel cells from various kinds of fuels by fuel reforming reactions (Ayabe et al, 2003;Utaka et al, 2003;Nguyen et al, 2011;Sung et al, 2012). In hydrogen production by fuel reforming there are several problems to deal with such as improvement of the catalytic activity, inhibition of carbon deposition on the surface of the catalysts and sintering of active species.…”

Section: Introductionmentioning

confidence: 99%

Novel Nickel Catalysts Based on Spinel-Type Mixed Oxides for Methane and Propane Steam Reforming

Kikuchi

Yokoyama

Takagaki

et al. 2014

J. Chem. Eng. Japan / JCEJ

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Novel nickel catalysts based on magnesium aluminate spinel-type mixed oxides are developed as hydrocarbon reforming catalysts for hydrogen supply to polymer electrolyte fuel cells. The spinel catalysts were prepared by co-precipitation and the Pechini method, and the spinels prepared by the former method exhibited higher activity for methane steam reforming. The e ect of spinel composition, Mg 1 x Ni x Al 2 O 4 (x 0.17, 0.35, 0.50, 0.70, 1) was investigated on the activity and resistance to carbon deposition in steam reforming reaction. The turnover frequency for methane steam reforming at a steam-to-carbon (S/C) ratio of 2 increased with increase in the x value from 0.17 to 0.35, and then gradually decreased with further increase in the nickel content. The carbon deposition tolerance of the spinel catalysts was examined in propane steam reforming at S/C 1 and 600°C. The propane conversion during the reaction was ca. 98% over all catalysts tested, and the amount of deposited carbon, determined as carbon dioxide by temperature programmed oxidation, was least at x 0.17, which is 1/8 of that deposited on a conventional Ni/γ-Al 2 O 3 catalyst. The spinels with x≤0.5 exhibited smaller amounts of carbon deposition, and thus superior tolerance to deactivation.

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“…Various heat-resistant materials have been tested as catalysts or catalyst supports in the high-temperature catalytic process, such as spinel [19], perovskites [20], and hexaaluminate [21,22] et al McCarty and co-workers [16,20] have investigated the sintering of a number of high-temperature supporting oxide powders and revealed that hexaaluminate powders have sintering resistance superior to all other oxide supports investigated, such as MgAl 2 O 4 spinel, LaAlO 3 , SrZrO 3 , and LaTiO 3 perovskites. Hexaaluminate materials exhibit stable phase composition up to 1600 • C and remarkable resistance to sintering and thermal shock.…”

Section: Introductionmentioning

confidence: 99%