Dispersion and surface states of copper catalysts by temperature-programmed-reduction of oxidized surfaces (s-TPR)

Gervasini, Antonella; Bennici, Simona

doi:10.1016/j.apcata.2004.11.030

Cited by 144 publications

(70 citation statements)

References 34 publications

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“…In addition, the mild conditions used for pre-reduction were effective for reducing the CuO phase to Cu but they did not allow reducing the formed Cu-Al and Cu-Co spinels. The similar situation has been studied by Gervasini et al [26]. They pointed out that when using the peak areas in first TPR profile to represent the total amount of Cu 2?…”

Section: Copper Dispersion Measurementsmentioning

confidence: 69%

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Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Luo

Jing

et al. 2012

Catal Lett

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A series of CuCoAl catalysts were synthesized by co-precipitation and impregnation methods, tested in synthesis of 2-methylpyrazine (2-MP) and characterized by X-ray diffraction, N 2 adsorption, thermo-gravimetry analysis, H 2 -temperature-programmed reduction, dissociative N 2 O adsorption and temperature-programmed oxidation. The precursors prepared by co-precipitation method shows a well-crystallized hydrotalcite. The study proves that the calcination temperature of hydrotalcite has a significant effect on the catalyst surface area, crystallite size and copper dispersion. In comparison with catalyst prepared by impregnation, the catalyst prepared by co-precipitation method calcined at 500°C exhibits higher specific surface area, higher copper dispersion and the better reducibility. Consequently, CuCoAl catalyst derived from hydrotalcite is more active and selective for synthesis of 2-MP. Moreover, it shows the better stability due to the good resistance to coke formation.

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Section: Copper Dispersion Measurementsmentioning

confidence: 69%

“…The copper surface area and dispersion were measured by dissociative N 2 O adsorption at 50°C [16,26]. 50 mg catalyst was pre-reduced at 180°C (with a heating rate of 5°C/min) for 1 h in 5% H 2 /N 2 mixture gas flow (30 mL/min).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Luo

Jing

et al. 2012

Catal Lett

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“…The reducing gas used was a mixture of 5% H 2 /N 2 flowing at 30 cm 3 min -1 . The s-TPR measurements allow us to calculate the copper dispersion (DCu), metal surface area (MSA) and average copper particle size (AV), as described by Gervasini et al [15].…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Performance of CuO–CeO2 Catalysts with Low Copper Content in CO Preferential Oxidation Reaction

2010

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“…In order to determine the copper surface exposed and the dispersion in the reduced samples, the nitrous oxide chemisorption was used as described in literature [22,23]. For the analysis, a Autochem 2910 (Micrometrics, USA) was employed.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Selective Hydrogenolysis of Glycerol to 1, 2 Propanediol Over Cu–ZnO Catalysts

et al. 2008

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A series of Cu-ZnO catalysts with varying Cu to Zn weight ratio are prepared by co-precipitation method. The catalysts were characterized by surface area, XRD, TPR and N 2 O chemisorption to measure Cu metal area. These catalysts were evaluated for hydrogenolysis of glycerol. The catalyst with Cu to Zn ratio of 50:50 is highly active under relatively low H 2 pressure. The catalysts are highly selective towards 1,2 propanediol ([93%). The glycerol conversion depends upon the bifunctional nature of catalyst where it requires both acidic sites and metal surface. The presence of sufficient amount with small particle size of ZnO and Cu are required for high conversion of glycerol and selectivity to 1,2 propanediol. Different reaction parameters are studied in order to optimize the reaction conditions.

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Dispersion and surface states of copper catalysts by temperature-programmed-reduction of oxidized surfaces (s-TPR)

Cited by 144 publications

References 34 publications

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Synthesis of 2-Methylpyrazine Over Highly Dispersed Copper Catalysts

Performance of CuO–CeO2 Catalysts with Low Copper Content in CO Preferential Oxidation Reaction

Selective Hydrogenolysis of Glycerol to 1, 2 Propanediol Over Cu–ZnO Catalysts

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