Adsorption of cobalt species on the interface, which is developed between aqueous solution and metal oxides used for the preparation of supported catalysts: a critical review

Bourikas, Kyriakos; Kordulis, Christos; Vakros, John; Lycourghiotis, Alexis

doi:10.1016/j.cis.2004.04.001

Cited by 79 publications

(69 citation statements)

References 108 publications

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“…From Fig. 2, it was also observed that non-negligible deposition of nickel occurs near the PZC of ␥-Al 2 O 3 , which also indicates that chemical interactions as well as electrostatic interactions are responsible for the adsorption [42]. The failure of the RPA model to describe adsorption data and the existence of multiple types of nickel species in solution in the presence of NH 4 OH indicates that chemical and electrostatic interactions are involved in adsorption of Ni 2+ on alumina.…”

Section: Synthesis Of 2 Wt% Ni/al 2 O 3 By Controlled Adsorption (2nica)mentioning

confidence: 73%

Effect of metal–support interactions in Ni/Al2O3 catalysts with low metal loading for methane dry reforming

Ewbank

Kovařík

Diallo

et al. 2015

Applied Catalysis A: General

117

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a b s t r a c tNickel catalysts prepared by a variety of different methods are commonly used for reforming reactions such as methane dry reforming. Two preparation methods, controlled adsorption and dry impregnation, are implemented to explore the effect of preparation method on the formation of active sites on alumina supported nickel catalysts. By varying only the preparation method, comparison of catalysts that differ primarily in metal-support interactions, strong metal-support interaction (controlled adsorption) and weak metal-support interactions (dry impregnation), are obtained. For controlled adsorption, optimal synthesis conditions are identified using point of zero charge measurements, pH-precipitation experiments, and adsorption isotherms. Using these conditions, a catalyst with a higher dispersion and strong metal-support interactions is prepared. Physicochemical characterization by N 2 physisorption, H 2 chemisorption, temperature programmed reduction (TPR), transmission electron microscopy (TEM), and environmental TEM (ETEM) shows that the types of nickel sites formed strongly depend on the synthesis method. Methane dry reforming reactivity studies show stable catalytic performance for at least 9 h and provide additional insight into the types of active centers present. After reductive pretreatment, the nickel catalyst prepared by dry impregnation is found to primarily have nickel present as a surface NiAl 2 O 4 . In contrast, the active centers for the nickel catalyst prepared by controlled adsorption consist of nickel particles that are encapsulated by a nickel aluminate layer with 1-2 nm in thickness. Combustion analysis and XPS of spent catalysts reveal different amounts and nature of carbonaceous deposits as a function of the synthesis method.

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Section: Synthesis Of 2 Wt% Ni/al 2 O 3 By Controlled Adsorption (2nica)mentioning

confidence: 73%

Effect of metal–support interactions in Ni/Al2O3 catalysts with low metal loading for methane dry reforming

Ewbank

Kovařík

Diallo

et al. 2015

Applied Catalysis A: General

117

View full text Add to dashboard Cite

show abstract

“…Generally, γ-Al 2 O 3 is commonly used as a heterogeneous catalyst or support due to its textural properties and good availability [18][19][20]. As reported previously, γ-Al 2 O 3 loaded with other active components can also be used as a solid base catalyst to catalyze the synthesis of organic carbonate via transesterification and Claisen Schmidt condensation reaction [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of glycerol carbonate from glycerol and dimethyl carbonate catalyzed by NaOH/γ-Al2O3

Bai

Wang

et al. 2013

Fuel Processing Technology

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“…It is well known that more than one kind of charged sites, Me x i OH z i y i (x: 1, 2, or 3, y: 1 or 2, z: negative, zero, or positive) are generally developed on the surfaces of solid metal (hydr)oxides [1][2][3][4]. In aqueous media these sites are protonated/deprotonated following the equilibria [5,6] (1)…”

Section: Introductionmentioning

confidence: 99%

How metal (hydr)oxides are protonated in aqueous media: The () rule and the role of the interfacial potential

Bourikas¹,

Kordulis²,

Lycourghiotis³

2006

Journal of Colloid and Interface Science

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Adsorption of cobalt species on the interface, which is developed between aqueous solution and metal oxides used for the preparation of supported catalysts: a critical review

Cited by 79 publications

References 108 publications

Effect of metal–support interactions in Ni/Al2O3 catalysts with low metal loading for methane dry reforming

Effect of metal–support interactions in Ni/Al2O3 catalysts with low metal loading for methane dry reforming

Synthesis of glycerol carbonate from glycerol and dimethyl carbonate catalyzed by NaOH/γ-Al2O3

How metal (hydr)oxides are protonated in aqueous media: The () rule and the role of the interfacial potential

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