Effect of Catalyst Preparation on Catalytic Activity

Huang, Y.-J.; Schwarz, John H.; Diehl, J. Rodney; Baltrus, John P.

doi:10.1016/s0166-9834(00)80112-8

Cited by 63 publications

(17 citation statements)

References 25 publications

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“…The structural bonding between Al 2 O 3 and Ni that frequently occurs in several synthesis procedures could promote the formation of a solid solution (spinel) that would lead to the deactivation of active sites of metallic Ni. [5][6][7] The Ni:MgO (18.3 wt% Ni) nanocomposite showed a phase evolution as a function of temperature similar to that observed in the Ni:Al 2 O 3 system. The MgO maximum intensity peak is very close to the metallic Ni peak (2v ϭ 44.5), which does not allow a good identification of the Ni phase (see Fig.…”

Section: Nanocomposite Phase Formation Studysupporting

confidence: 53%

Synthesis of Metal-Oxide Matrix with Embedded Nickel Nanoparticles by a Bottom-up Chemical Process

Carreño

Lima²,

Soledade³

et al. 2003

J. Nanosci. Nanotech.

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Here we describe a new chemical route for obtaining highly dispersed nanometric Ni particles embedded in different matrices based on Al2O3, MgO, and TiO2 and in the heterogeneous matrices CeO2-doped Al2O3 and MgO-doped Al2O3. The synthesis method is based on a modification of the polymeric precursor method. The Ni nanoparticles (particles in the range of 1-40 nm) were obtained in a single process, without the use of an external reducing agent (hydrogen atmosphere).

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Section: Nanocomposite Phase Formation Studysupporting

confidence: 53%

Synthesis of Metal-Oxide Matrix with Embedded Nickel Nanoparticles by a Bottom-up Chemical Process

Carreño

Lima²,

Soledade³

et al. 2003

J. Nanosci. Nanotech.

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“…7. This sharp peak has been associated to nickel aluminate species [10,11]. In the case of g-alumina, this second peak was of very low intensity.…”

Section: Resultsmentioning

confidence: 97%

Properties of sol–gel derived mesoporous aluminas as metal traps

Vargas

Maldonado

Montoya

et al. 2004

Applied Catalysis A: General

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“…However, one of the main problems with Ni/Al 2 O 3 catalysts with low nickel content is the formation of supposedly inactive nickel aluminate. In the literature, several common critical points with regards to the types of nickel species present on the alumina surface were identified: Oxidation at 500 • C was said to form stoichiometric and nonstoichiometric nickel aluminates [13], and nickel loadings below 1 wt% were said to produce only surface NiAl 2 O 4 [11,20]. In case of slightly higher weight loading (such as 2 wt%), different types of active sites (NiAl 2 O 4 and NiO) are expected to be present.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of Catalyst Preparation on Catalytic Activity

Cited by 63 publications

References 25 publications

Synthesis of Metal-Oxide Matrix with Embedded Nickel Nanoparticles by a Bottom-up Chemical Process

Synthesis of Metal-Oxide Matrix with Embedded Nickel Nanoparticles by a Bottom-up Chemical Process

Properties of sol–gel derived mesoporous aluminas as metal traps

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

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