Nickel(II) ion-support interactions as a function of preparation method of silica-supported nickel materials

Clause, O.; Kermarec, M.; Bonneviot, Laurent; Villain, F.; Che, Michel

doi:10.1021/ja00038a038

Cited by 140 publications

(121 citation statements)

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“…Finally, the test for the Ni/SiO 2 catalyst presented a wide area H 2 -peak consumption centered around 873 K, which was associated with the preparation method employed, which can lead to the formation of highly stable hydrosilicates having high reduction temperatures. 19 Literature data report that these hydrosilicates probably exist under structures of the type antigorite, Ni 3 (OH) 3 Si 2 O 5 (OH), or talc, Ni 3 (OH) 2 (Si 2 0 5 ) 2 .…”

Section: Resultsmentioning

confidence: 99%

Transition metal-based bimetallic catalysts for the chemoselective hydrogenation of furfuraldehyde

Vetere

Merlo

Ruggera

et al. 2010

J. Braz. Chem. Soc.

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Neste trabalho foi estudada a hidrogenação quimiosseletiva em fase líquida do furfural, empregando-se catalisadores baseados em Pt, Rh e Ni. Sistemas bimetálicos, contendo diferentes quantidades de estanho, foram obtidos por meio de reações de superfície controlada entre um catalisador monometálico e Sn(C 4 H 9 ) 4 . Quando foram utilizados catalisadores monometálicos, os resultados obtidos sugerem uma relação entre as propriedades do metal e da atividade e seletividade. Todos os sistemas permitiram a obtenção do álcool furfurílico com alta seletividade (99, 97 e 76% com catalisadores de Pt, Rh e Ni, respectivamente). A adição de estanho tem efeitos diferentes sobre os três sistemas, tanto em termos de conversão quanto na seletividade. Um resultado interessante foi obtido para os catalisadores baseados em Ni, para os quais a adição de estanho levou a um aumento significativo da seletividade do álcool furfurílico e, dependendo da razão Sn/Ni, também há um aumento na atividade catalítica do sistema.In this work, the liquid-phase chemoselective hydrogenation of furfural was studied, employing Pt, Rh and Ni-based catalysts. Bimetallic systems, containing different amounts of tin, were obtained by means of controlled surface reactions between a monometallic catalyst and Sn(C 4 H 9 ) 4 . The results obtained when monometallic catalysts were employed suggest a relationship between metal properties and the activity and selectivity obtained. All systems allowed obtaining furfuryl alcohol with high selectivity (99, 97 and 76% were achieved with Pt, Rh and Ni catalysts, respectively). The addition of tin has different effects on the three systems, both in terms of conversion and selectivity. An interesting result was obtained for the Ni-based catalysts, for which the addition of tin led to a significant increase in furfuryl alcohol selectivity and, depending on the Sn/Ni ratio, also to an increase in the catalytic activity of the system. Keywords: furfural, furfuryl alcohol, hydrogenation, bimetallic catalysts, PtSn IntroductionThe hydrogenation of furfural is an important reaction in the chemical industry as it is the main way of obtaining furfuryl alcohol.1 This product is widely used in the production of resins, as an intermediate in the manufacture of lysine, vitamin C and lubricants, and to obtain tetrahydrofurfuryl alcohol, among other applications. [2][3][4] Due to the large variety of products that can be obtained from the hydrogenation of furfural, this reaction represents a great challenge from the point of view of its chemoselectivity. As shown in Figure 1, in addition to the products coming from the hydrogenation of the C=O bond and/or the furan ring, there are numerous compounds derived from side reactions (hydrogenolysis of the C=O bond, decarbonylation, hydrogenation and ring opening, condensation reactions, etc.). 3,5 In chemoselective hydrogenation reactions using heterogeneous catalysts, the choice of the active metal is a key factor, since its influence on the resulting activity and/or selectivity is wel...

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Section: Resultsmentioning

confidence: 99%

Transition metal-based bimetallic catalysts for the chemoselective hydrogenation of furfuraldehyde

Vetere

Merlo

Ruggera

et al. 2010

J. Braz. Chem. Soc.

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“…The solubilities of CoKer (Co 3 Si 4 O 10 (OH) 2 ), CoChrys (Co 3 Si 2 O 5 (OH) 4 ), and CoStev (NaCo 2.5 Si 4 O 10 (OH) 2 ) were calculated using the free-energy approach of Tardy and co-workers (40 -43) (Appendix).…”

Section: Dissolution Equilibria For Solubility Of Co/clays and Co(oh)mentioning

confidence: 99%

Evidence for the Formation of Trioctahedral Clay upon Sorption of Co2+ on Quartz

Manceau

Schlegel

Nagy

et al. 1999

Journal of Colloid and Interface Science

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“…The dried impregnate is heat treated in air, called calcination, to convert the precursor into the desired metal oxide, optionally followed by a high temperature reduction treatment to obtain the metal in question. State-of-the-art studies at low Ni loadings and strong precursor-support interactions have revealed much insight into the interplay between metal, ligands, counterions and supports, and their impact on the activity, selectivity and stability of the final catalyst [13,16,17,19]. Moreover, these studies have yielded fundamental insight into the importance of liquid-solid interactions between precursor solution and support on the formation of poorly reducible mixed Ni phases like aluminates or phyllosilicates.…”

Section: Introductionmentioning

confidence: 99%

How nitric oxide affects the decomposition of supported nickel nitrate to arrive at highly dispersed catalysts

Sietsma

Friedrich

Broersma

et al. 2008

Journal of Catalysis

108

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An explanation is put forward for the beneficial effect of thermal decomposition of supported Ni 3 (NO 3 ) 2 (OH) 4 in NO/He flow (0.1-1 vol%) that enables preparation of well-dispersed (3-5 nm particles) 24 wt% Ni-catalysts via impregnation and drying using aqueous [Ni(OH 2 ) 6 ](NO 3 ) 2 precursor solution. Moreover, combining electron tomography, XRD and N 2 -physisorption with SBA-15 support yielded a clear picture of the impact of air, He and NO/He gas atmospheres on NiO shape and distribution. TGA/MS indicated that NO 2 , N 2 O, H 2 O products evolved more gradually in NO/He. In situ XRD and DSC revealed that NO lowers the nitrate decomposition rate and appears less endothermic than in air supposedly due to exothermic scavenging of oxygen by NO, which is supported by MS results. The Ni/SiO 2 catalyst prepared via the NO-method displayed a higher activity in the hydrogenation of soybean oil as the required hydrogenation time decreased by 30% compared to the traditionally air calcined catalyst.

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Nickel(II) ion-support interactions as a function of preparation method of silica-supported nickel materials

Cited by 140 publications

References 0 publications

Transition metal-based bimetallic catalysts for the chemoselective hydrogenation of furfuraldehyde

Transition metal-based bimetallic catalysts for the chemoselective hydrogenation of furfuraldehyde

Evidence for the Formation of Trioctahedral Clay upon Sorption of Co2+ on Quartz

How nitric oxide affects the decomposition of supported nickel nitrate to arrive at highly dispersed catalysts

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