Estudo microestrutural do catalisador Ni/gama-Al2O3: efeito da adição de CeO2 na reforma do metano com dióxido de carbono

Valentini, Antoninho; Probst, Luiz Fernando Dias; Carreño, Neftalí Lênin Villarreal; Leite, E. R.; Longo, Elson; Schreiner, W. H.; Lisboa‐Filho, Paulo Noronha

doi:10.1590/s0100-40422003000500005

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…In addition, CeO 2 is known to enhance the reducibility and the dispersion of the supported metal. In spite of such interesting characteristics, the major limitation to applying CeO 2 as a support for metallic catalysts is its low specific surface area and poor textural stability under reduction conditions [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production from Ethanol Steam Reforming Over Ni/CeO2 Nanocomposite Catalysts

et al. 2007

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The organic polymer chitosan was used as the polymeric precursor for the synthesis of Ni/CeO 2 nanocomposite catalysts. The materials were characterized by N 2 physisorption, H 2 chemisorption, AA, XRD, TGA, TPR, SEM and TEM analyses. The catalysts provide very good reactivity in ethanol steam reforming compared to the conventional Ni/CeO 2 catalyst prepared by the impregnation method using a commercial support. High hydrogen selectivity (>75%) was obtained on Ni/CeO 2 catalysts by operating at a temperature range of 325-500°C and a H 2 O/ C 2 H 5 OH molar ratio of 3. It was verified that the catalytic behavior could be influenced depending on the experimental conditions employed.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Production from Ethanol Steam Reforming Over Ni/CeO2 Nanocomposite Catalysts

et al. 2007

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“…In order to compare the catalytic performance, the CH 4 conversion test was performed with a Ni catalyst supported on ceria processed by the impregnation method. This catalyst did not exhibit activity in carbon dioxide reforming of methane; probably due to deactivation of the catalytic site by CeO 2 layer formation on the metal surface during the in situ reduction at 650 8C in H 2 atmosphere, which was observed by XRD, Raman and XPS [15].…”

Section: Resultsmentioning

confidence: 93%

“…The presence of CeO 2 in the catalysts composition has improved the catalytic performance, mainly the coke resistance [15]. The lower carbon deposition, in the sample with CeO 2 , is probably due to the oxidation and reduction of CeO 2 during the catalytic process [16][17][18].…”

Section: Introductionmentioning

confidence: 96%

“…The lower carbon deposition, in the sample with CeO 2 , is probably due to the oxidation and reduction of CeO 2 during the catalytic process [16][17][18]. In spite of the interesting industrial application, the CeO 2 is not a good support for catalytic samples mainly due to its low surface area [14] and poor textural stability under reducing conditions [15,19].…”

Section: Introductionmentioning

confidence: 99%

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Ni:CeO2 nanocomposite catalysts prepared by polymeric precursor method

Valentini

Carreño

Probst

et al. 2006

Applied Catalysis A: General

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“…Estes filamentos podem não obstruir imediatamente a superfície metálica, porém tendem a provocar a fratura dos grãos do catalisador e um possível encapsulamento. Tal fenômeno provoca perda de carga dos reatores, seguida da desativação (VALENTINI et al, 2003). Dentre as formas filamentosas, podem-se citar as fibras, tubos ou whiskers.…”

Section: Reforma Seca Do Metanounclassified

Avaliação do desempenho de catalisadores obtidos de hidrotalcitas na reforma seca do metano

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-800 ° C, while temperature-programmed desorption of CO 2 (CO 2 -TPD) showed that the catalysts have weak basic sites. In addition, the catalysts were characterized by Nitrogen physisorption, scanning electron microscopy (SEM), Raman spectroscopy and basicity using a Hammett indicator. The performance of the catalysts was evaluated in the dry reforming reaction of the methane using a CH 4 : CO 2 molar feed ratio = 1.5: 1.0; In order to simulate the biogas composition. The results showed a higher conversion to CO 2 in all the catalysts investigated, which can be attributed to the higher content of CH 4 fed. In addition, it is important to restate the contribution of the basic sites present in the samples, which may also contribute to the conversion of CO2.The higher conversion of CH 4 was observed for the catalysts treated at 750 ° C. After the reactions, the formation of graphite carbon was observed on all the catalysts, with a lower percentage for Ni / ZnAl samples, calcined at 550 ° C and 650 ° C, and Ni / ZnZr-7, calcined at 750 ° C. Finally, the catalysts calcined at 650 ° C and 750 ° C were also activated at the temperature of 750 ° C. and the reaction results showed that this temperature favored the agglomeration process and, therefore, promoted low conversions for CH 4 and CO 2 .

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Estudo microestrutural do catalisador Ni/gama-Al2O3: efeito da adição de CeO2 na reforma do metano com dióxido de carbono

Cited by 9 publications

References 18 publications

Hydrogen Production from Ethanol Steam Reforming Over Ni/CeO2 Nanocomposite Catalysts

Hydrogen Production from Ethanol Steam Reforming Over Ni/CeO2 Nanocomposite Catalysts

Ni:CeO2 nanocomposite catalysts prepared by polymeric precursor method

Avaliação do desempenho de catalisadores obtidos de hidrotalcitas na reforma seca do metano

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