Oxidative Conversion of Methane to Syngas over LaNiO3Perovskite with or without Simultaneous Steam and CO2Reforming Reactions: Influence of Partial Substitution of La and Ni

Choudhary, Vasant R.; Uphade, Balu S.; Belhekar, A.A.

doi:10.1006/jcat.1996.0332

Cited by 123 publications

(55 citation statements)

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“…On the other hand, when the Ni was substituted by Co, the surface area was decreased continuously. When increasing the calcination temperature a significant reduction in the values of surface area occurred, which was more emphasized with the increase of the amount of Co. A similar result was described by Choudhary et al (1996) 1 . It is also possible to observe that with the increase of the calcination time a decrease of the area also occurs.…”

Section: Resultssupporting

confidence: 76%

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Synthesis and Characterization of LaNiO3, LaNi(1-x)Fe xO3 andLaNi(1-x)Co xO3 Perovskite Oxides for Catalysis Application

Lima

Assaf

2002

Mat. Res.

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Mixed metal oxides with perovskite-type structure show a great potential to be used in catalysis, electrocatalysis and electronic ceramics. Perovskites oxides catalysts with the composition LaNiO 3 , LaNi (1-x) Fe x O 3 and LaNi (1-x) Co x O 3 (x = 0.4 and 0.7) have been synthesized by the precipitation method to be used in the methane reforming to produce hydrogen and synthesis gas. The compounds were characterized by X-ray diffraction, thermogravimetric and differential thermal analysis, inductively coupled plasma atomic emission spectroscopy, surface area measurements, energy dispersive X-ray spectrometry coupled to scanning electron microscopy and temperature programmed reduction. The results showed that a suitable combination of the preparation method with calcination variables (time and temperature) could result in oxides with the desired structure and with important properties at the application point of view in heterogeneous catalysis.

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Section: Resultssupporting

confidence: 76%

“…The methane steam and CO 2 reforming are endothermic processes for the manufacture of syngas and hydrogen with molar ratio H 2 /CO between 1 and 3 1 . They are used in industry for the methanol, Fischer-Tropsch and ammonia synthesis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of LaNiO3, LaNi(1-x)Fe xO3 andLaNi(1-x)Co xO3 Perovskite Oxides for Catalysis Application

Lima

Assaf

2002

Mat. Res.

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“…Observa-se que a área superficial diminuiu continuamente com a substituição de níquel por cobalto, sendo este resultado já relatado na literatura 8 . Ao aumentar a temperatura de calcinação houve uma redução significativa nos valores de área superficial, sendo esta redução mais acentuada com o aumento do teor de cobalto.…”

Section: áRea Superficial Específicaunclassified

“…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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“…Also, the operation at high temperature thermodynamically suppresses the exothermic Boudouard side-reaction, which is to a large extent responsible for undesired carbon filament growth [31][32]. A similar synthetic approach to stabilize Ni nanoparticles at high temperatures against sintering by incorporation into a stable oxide matrix was previously also applied for Ni-containing perovskites [33] and spinels [34]. Also LDH precursors have been already applied to synthesize Ni-based catalysts for dry reforming of methane [35][36].…”

Section: Supported Ni Catalystsmentioning

confidence: 99%

Coprecipitation: An excellent tool for the synthesis of supported metal catalysts – From the understanding of the well known recipes to new materials

Behrens

2015

Catalysis Today

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Abstract:Constant-pH co-precipitation is a standard synthesis technique for catalyst precursors.The general steps of this synthesis route are described in this work using the successfully applied industrial synthesis of the Cu/ZnO/(Al 2 O 3 ) catalyst for methanol synthesis as an example. Therein, co-precipitation leads to well-defined and crystalline precursor compound with a mixed cationic lattice that contains all metal species of the final catalyst. The anions are thermally decomposed to give the mixed oxides and the noblest component, in this current case copper, finally segregates on a nano-metric level to yield supported and uniform metal nanoparticles. Recent examples of the application of this synthesis concept for supported catalysts are reported with an emphasis on the layered double hydroxide precursor (Cu,Zn,Al; Ni,Mg,Al; Pd,Mg,Al; Pd,Mg,Ga). This precursor material is very versatile and can lead to highly loaded base metal as well as to mono-and bi-metallic highly dispersed noble metal catalysts.

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Oxidative Conversion of Methane to Syngas over LaNiO3Perovskite with or without Simultaneous Steam and CO2Reforming Reactions: Influence of Partial Substitution of La and Ni

Cited by 123 publications

References 0 publications

Synthesis and Characterization of LaNiO3, LaNi(1-x)Fe xO3 andLaNi(1-x)Co xO3 Perovskite Oxides for Catalysis Application

Synthesis and Characterization of LaNiO3, LaNi(1-x)Fe xO3 andLaNi(1-x)Co xO3 Perovskite Oxides for Catalysis Application

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

Coprecipitation: An excellent tool for the synthesis of supported metal catalysts – From the understanding of the well known recipes to new materials

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