Effects of promoters and preparation procedures on reforming of methane with carbon dioxide over Ni/Al2O3 catalyst

Cheng, Zhenxing; Wu, Qingle; Li, Jinlu; Zhu, Qi

doi:10.1016/0920-5861(95)00005-4

Cited by 189 publications

(66 citation statements)

References 34 publications

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“…It is known that cerium oxide has an oxygen storage property because of high oxygen mobility in its lattice [24,25]. Thus it is prone to interact with metal active components thereby affecting the reduction behavior of metal oxides and promoting the activity of the catalyst [26].…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

Hydrogenolysis of glycerol aqueous solution to glycols over Ni–Co bimetallic catalyst: effect of ceria promoting

Jiang

Kong

et al. 2015

Appl Petrochem Res

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A series of Ni-Co bimetallic catalysts supported on c-Al 2 O 3 with different Ni/Co mass ratio were prepared by incipient wetness impregnation method for glycerol hydrogenolysis. The catalyst with a Ni/Co mass ratio of 1:3 (denoted as Ni 1 Co 3 ) exhibited the highest conversion. The performance was compared with that of catalysts promoted by Ce. Moreover, the addition of Ce showed a remarkable promoting effect on the catalytic performance when the cerium content was 2.5 wt%. The physicochemical properties of the supported Ni-Co catalysts were characterized by N 2 physisorption, XRD, H 2 -TPR, NH 3 -TPD, XPS and TEM. H 2 -TPR profiles revealed that the coexistence of Ni and Co components on support changed the respective reduction behavior of Ni or Co alone, showing the synergistic effect between Ni and Co species. Compared with the TPR profiles of Ni 1 Co 3 , it was clearly observed that the reduction peak of nickel oxide and/or cobalt oxide shifted down to the lower temperature zone gradually with the addition of Ce. It was most probable that the addition of Ce favored the formation of the strong interaction between metal species and ceria. The TEM images showed that the addition of Ce component could improve the dispersion of Ni-Co species on support and inhibited the agglomeration of metal particles during the reaction process, which might be responsible for the enhanced stability.

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Section: Physicochemical Propertiesmentioning

confidence: 99%

Hydrogenolysis of glycerol aqueous solution to glycols over Ni–Co bimetallic catalyst: effect of ceria promoting

Jiang

Kong

et al. 2015

Appl Petrochem Res

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“…Numerosos catalisadores metálicos foram estudados para esta reação. Dentre eles, catalisadores baseados em níquel 3,[6][7][8][9][10][11] e metais nobres (Rh, Ru, Ir, Pd e Pt) 5,[12][13][14] têm mostrado desempenho catalítico, em termos de atividade e seletividade, promissores para gás de sín-tese. Dentre estes catalisadores, os metais nobres mostraram-se melhores quando comparados ao Ni, pois este último se desativa rapidamente devido à deposição de carbono.…”

Section: Introductionunclassified

Síntese e caracterização de perovskitas LaNi(1-x)Co xO3 como precursores de catalisadores para a conversão do metano a gás de síntese pela reforma com CO2

Lima¹,

Assaf²

2007

Quím. Nova

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Recebido em 3/11/05; aceito em 23/06/06; publicado na web em 28/11/06 PREPARATION AND CHARACTERIZATION OF LaNi (1-x) Co x O 3 PEROVSKITES AS CATALYST PRECURSORS FOR SYNTHESIS GAS GENERATION BY CO 2 REFORMING OF METHANE. LaNiO 3 perovskite was modified by partial substitution of nickel by cobalt in order to increase the stability and resistance to carbon deposition during the methane CO 2 reforming. The results showed that a suitable combination of precipitation and calcination steps resulted in oxides with the desired structure and with important properties for application in heterogeneous catalysis. The partial substitution of Ni by Co resulted in lower rates of conversion of both the reactants, but the catalyst stability was highly increased. The LaNi 0.3 Co 0.7 O 3 catalyst, calcined at 800 ºC, was the most active under the reaction conditions. Keywords: CO 2 reforming of methane; LaNi (1-x) Co x O 3 perovskite-type oxides; syngas production. INTRODUÇÃOA conversão de metano e dióxido de carbono, materiais mais abundantes na natureza que contêm carbono, em produtos de alto valor agregado tem sido uma importante área de pesquisa em desenvolvimento de catalisadores nos últimos anos. A reação de reforma do metano com dióxido de carbono para produção de gás de síntese (CO/ H 2 ) é uma rota atrativa para produção de energia e produtos químicos, oferecendo importantes vantagens sobre outros processos. Uma vantagem potencial da reforma do metano com CO 2 (reforma seca), que tem impacto positivo sobre o setor industrial, é a baixa razão H 2 /CO que é produzida (1:1 ou menor). Uma razão H 2 /CO mais baixa, quando comparada com a reforma a vapor e a oxidação parcial, é necessá-ria para produção de compostos oxigenados 1,2 . Deve-se considerar também a possibilidade de combinar as reações de reforma a vapor, oxidação parcial e reforma seca para alcançar uma razão H 2 /CO desejada [3][4][5] . No entanto, a reforma do metano com dióxido de carbono apresenta dois problemas sérios, que devem ser superados para a utilização da mesma comercialmente: é uma reação altamente endotérmica (ΔH 0 298 = 247 kJ/mol), que consome muita energia, e os catalisadores usados nesta reação estão sujeitos à desativação devido à deposição de carbono sobre a superfície dos mesmos.Durante alguns anos, muitos esforços foram direcionados para o desenvolvimento de catalisadores que mostrassem alta atividade e que apresentassem resistência à formação de depósitos de carbono. Numerosos catalisadores metálicos foram estudados para esta reação. Dentre eles, catalisadores baseados em níquel 3,6-11 e metais nobres (Rh, Ru, Ir, Pd e Pt) 5,12-14 têm mostrado desempenho catalítico, em termos de atividade e seletividade, promissores para gás de sín-tese. Dentre estes catalisadores, os metais nobres mostraram-se melhores quando comparados ao Ni, pois este último se desativa rapidamente devido à deposição de carbono. No entanto, o alto custo dos metais nobres torna atrativo o desenvolvimento de catalisadores de Ni para utilização industrial. Um dos desafios cons...

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“…Industrially, the metal chosen as catalyst is Ni, since it has activity comparable to noble metals. However, it quickly deactivates due to the formation of carbonaceous deposits [12][13][14]. Considering the high cost and limited availability of noble metals, it is more attractive to develop a nickel catalyst of high catalytic performance and resistant to deactivation due to coke formation using a defined structure or solid solution with La, Al or Mg (spinel, fluorite, and perovskite) [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Nickel catalyst supported on magnesium and zinc aluminates (MgAl2O4 and ZnAl2O4) spinels for dry reforming of methane

et al. 2017

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Materials such as MgAl 2 O 4 and ZnAl 2 O 4 assessed in the reaction of dry reforming of methane to produce syngas were synthesized by microwave-assisted combustion method using urea as fuel. Samples of synthesized oxides were calcined at 800 °C for 2 h and impregnated with 5% nickel. The impregnated samples were calcined at 850 °C for 4 h to obtain the desired phases. The results of the catalytic tests showed that the catalysts are active for the reaction of dry reforming of methane, and the catalyst that showed the best performance for methane conversion was 5% Ni/MgAl 2 O 4 calcined at 850 °C/4 h. Keywords: chemical synthesis, powder diffraction, oxides, dry reform, nickel catalysts. Resumo Materiais

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Effects of promoters and preparation procedures on reforming of methane with carbon dioxide over Ni/Al2O3 catalyst

Cited by 189 publications

References 34 publications

Hydrogenolysis of glycerol aqueous solution to glycols over Ni–Co bimetallic catalyst: effect of ceria promoting

Hydrogenolysis of glycerol aqueous solution to glycols over Ni–Co bimetallic catalyst: effect of ceria promoting

Síntese e caracterização de perovskitas LaNi(1-x)Co xO3 como precursores de catalisadores para a conversão do metano a gás de síntese pela reforma com CO2

Nickel catalyst supported on magnesium and zinc aluminates (MgAl2O4 and ZnAl2O4) spinels for dry reforming of methane

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