Determination of reducibility and identification of alloying in copper-nickel-on-silica catalysts by temperature-programmed reduction

Robertson, S.D.; McNicol, Brian D.; Baas, Jacob; Kloet, S.C.; Jenkins, J. W.

doi:10.1016/0021-9517(75)90179-7

Cited by 336 publications

(44 citation statements)

References 10 publications

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“…2, which were likely related to different intermediary species of NiO, La 2 O 3 and CeO 2 . The temperature of the peak of free NiO during the H 2 -TPR process was reported to be approximately 330 C [36]. As shown in the figure, there was a main peak with a reduction temperature of w332 C and a small peak at w765 C for the NiOeCeO 2 catalyst, which could be assigned to the reduction of free NiO and surface CeO 2 (Ce 4þ to Ce 3þ ), respectively.…”

Section: Basic Propertiesmentioning

confidence: 94%

A new nickel–ceria composite for direct-methane solid oxide fuel cells

Zhu

Wang

Ran

et al. 2013

International Journal of Hydrogen Energy

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Section: Basic Propertiesmentioning

confidence: 94%

A new nickel–ceria composite for direct-methane solid oxide fuel cells

Zhu

Wang

Ran

et al. 2013

International Journal of Hydrogen Energy

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“…Catalyst Characterisation: The catalysts were characterised using Temperature Programmed Reduction (TPR) on an in-house constructed apparatus 15 .…”

Section: Methodsmentioning

confidence: 99%

NH3 and urea in the selective catalytic reduction of NOx over oxide-supported copper catalysts

Sullivan

Doherty

2005

Applied Catalysis B: Environmental

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Abstract.The temperature programmed activity of a series of oxide supported (TiO 2 , Al 2 O 3 and SiO 2 ) Cu catalysts formed from two different Cu precursors (Cu(NO 3 ) 2 and CuSO 4 ) for the selective catalytic reduction of NO x using solutions of urea as a reductant have been determined. These activities are compared to those found using NH 3 as a reducing agent over the same catalysts in the presence of H 2 O and it is found that catalysts that are active for the selective reduction of NO x with NH 3 are inactive for its reduction using solutions of urea. Poisoning of the surface by H 2 O ads is not responsible for all of this decrease in activity and it is postulated that the urea is not hydrolysing to form NH 3 over the catalysts but rather is oxidising to form N 2 or forming passivated layers of polymeric melamine complexes on the surface.

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“…The TPR profile of the Rh/MCM-41 catalyst suggests some metal-support interactions, which widen the reduction peak at higher temperatures. Metal-support interactions are observed in other mesoporous catalysts as well as in traditional catalysts [13,26]. Moreover, after the reduction treatment at 370 °C the surface of the …”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 86%

Synthesis of Ethanol from Syngas over Rh/MCM-41 Catalyst: Effect of Water on Product Selectivity

et al. 2015

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Abstract:The thermochemical processing of biomass is an alternative route for the manufacture of fuel-grade ethanol, in which the catalytic conversion of syngas to ethanol is a key step. The search for novel catalyst formulations, active sites and types of support is of current interest. In this work, the catalytic performance of an Rh/MCM-41 catalyst has been evaluated and compared with a typical Rh/SiO2 catalyst. They have been compared at identical reaction conditions (280 °C and 20 bar), at low syngas conversion (2.8%) and at same metal dispersion (H/Rh = 22%). Under these conditions, the catalysts showed different product selectivities. The differences have been attributed to the concentration of water vapor in the pores of Rh/MCM-41. The concentration of water vapor could promote the water-gas-shift-reaction generating some extra carbon dioxide and hydrogen, which in turn can induce side reactions and change the product selectivity. The extra hydrogen generated could facilitate the hydrogenation of a C2-oxygenated intermediate to ethanol, thus resulting in a higher ethanol selectivity over the Rh/MCM-41 catalyst as compared to the typical Rh/SiO2 catalyst; 24% and 8%, respectively. The catalysts have been characterized, before and after reaction, by N2-physisorption, X-ray photoelectron OPEN ACCESSCatalysts 2015, 5 1738 spectroscopy, X-ray diffraction, H2-chemisorption, transmission electron microscopy and temperature programmed reduction.

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Determination of reducibility and identification of alloying in copper-nickel-on-silica catalysts by temperature-programmed reduction

Cited by 336 publications

References 10 publications

A new nickel–ceria composite for direct-methane solid oxide fuel cells

A new nickel–ceria composite for direct-methane solid oxide fuel cells

NH3 and urea in the selective catalytic reduction of NOx over oxide-supported copper catalysts

Synthesis of Ethanol from Syngas over Rh/MCM-41 Catalyst: Effect of Water on Product Selectivity

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