In situ XPS investigations of Cu1−xNixZnAl-mixed metal oxide catalysts used in the oxidative steam reforming of bio-ethanol

Velu, S.; Suzuki, Kenzi; Vijayaraj, Munusamy; Barman, Sanmitra; Gopinath, Chinnakonda S.

doi:10.1016/j.apcatb.2004.09.007

Cited by 221 publications

(124 citation statements)

References 46 publications

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“…3b). The first peak is due to the decomposition of the Ni nitrate precursor to Ni in its oxidized state [30][31][32][33] while the second peak is attributed to the reduction of nickel oxide species to metallic Ni [34]. For monometallic Cu sample, the reduction peak between 500 and 550 K (Fig.…”

Section: Tprmentioning

confidence: 99%

Influence of copper on nickel-based catalysts in the conversion of glycerol

Miranda

Chimentão

Szanyi

et al. 2015

Applied Catalysis B: Environmental

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The catalytic transformation of glycerol to value-added compounds was investigated over bimetallic Ni-Cu/y-Al2 O3 catalysts with Ni/Cu atomic ratios of 8/1, 4/1, 2/1, 1/1, 1/2, 1/4, and 1/8. XPS analysis revealed that the surface composition of the catalyst exhibited progressive enrichment of Cu as its content in the catalyst increased. H2 -chemisorption indicated that the total number of exposed Ni atoms decreased as the Cu content increased. As a result, deep hydrogenolysis to produce CH4 was inhibited by the addition of Cu to the Ni catalyst, yielding higher selectivity toward the dehydration products of glycerol such as hydroxyacetone.FTIR spectra of adsorbed CO reveal that Cu asserts both geometric and electronic effects on the adsorption properties of Ni. The geometrical effect is visualized by the progressive disappearance of the bridge-bound adsorbed CO on metallic Ni by the incorporation of Cu. This suggests that the deep hydrogenolysis of glycerol to CH4 formation requires an ensemble of adjacent active Ni atoms. The electronic effect of Cu on Ni is indicated by the red shift of the IR peak of adsorbed CO as the Cu content increases. The electronic interaction between Cu and Ni species was also substantiated by XANES results. HTREM revealed metal particles very well distributed on the support with particle size of 1.5 to 5 nm. The Ni-Cu samples were not a total intermetallic alloys..

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Section: Tprmentioning

confidence: 99%

Influence of copper on nickel-based catalysts in the conversion of glycerol

Miranda

Chimentão

Szanyi

et al. 2015

Applied Catalysis B: Environmental

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“…157 In 2005, Velu et al 158 reported a study of the catalytic activity of a series of Cu-Ni-Zn-Al-multicomponent mixed metal oxide catalysts with various Cu/Ni ratios, in the oxidative steam reforming of bio-ethanol. It was found that the ethanol dehydrogenation towards acetaldehyde is favored by the Cu-rich catalysts while Ni enhances the cracking of C-C bonds, producing CO, CO 2 , CH 4 and H 2 .…”

Section: Green Chemistry Critical Reviewmentioning

confidence: 99%

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

et al. 2017

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Layered double hydroxides (LDHs) and derived materials have been widely used as heterogeneous catalysts for different types of reactions either in gas or in liquid phase. Among these processes, the valorization/upgrading of lignocellulosic biomass and derived molecules have attracted enormous attention because it constitutes a pivotal axis in the transition from an economic model based on fossil resources to one based on renewable biomass resources with preference for biomass waste streams. Proof of this is the increasing amount of literature reports regarding the rational design and implementation of LDHs and related materials in catalytic processes such as: depolymerization, hydrogenation, selective oxidations, and C-C coupling reactions, among others, where biomass-derived compounds are used. The major aim of this contribution is to situate the most recent advances on the implementation of these types of catalysts into a lignocellulosic-feedstock biorefinery scheme, highlighting the versatility of LDHs and derived materials as multifunctional, tunable, cheap and easy to produce heterogeneous catalysts.

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“…Ethanol can be converted in hydrogen by onboard steam reforming or can be more conveniently used as a proton donor in specific fuel-cell technologies (Lamy et al, 2004). Ethanol-based steam reforming is performed following equation (13) (Velu et al, 2005).…”

Section: Fuel Cellsmentioning

confidence: 99%

The Challenge of Bioenergies: An Overview

Carels¹

2011

Biofuel's Engineering Process Technology

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In situ XPS investigations of Cu1−xNixZnAl-mixed metal oxide catalysts used in the oxidative steam reforming of bio-ethanol

Cited by 221 publications

References 46 publications

Influence of copper on nickel-based catalysts in the conversion of glycerol

Influence of copper on nickel-based catalysts in the conversion of glycerol

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

The Challenge of Bioenergies: An Overview

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