Influence of preparation methods and Zr and Y promoters on Cu/ZnO catalysts used for methanol steam reforming

Sanches, Sabrina Guimarães; Flores, Jhonny Huertas; Avillez, Roberto R. de; Silva, M.I. Pais da

doi:10.1016/j.ijhydene.2012.01.033

Cited by 57 publications

(37 citation statements)

References 34 publications

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“…5. The hydrogen-formation rate at 473 K over the Cu/ ZnO/ZrO 2 /Al 2 O 3 catalysts reduced at 523 K decreased in the following order, irrespective of the calcination temperature: Methanol conversion in SRM has been reported to increase with an increase in the Cu surface area [44]. In the present study, the Cu 0.3 Zn 0.3 Zr 0.4 Al 0.0 catalyst with the highest D Cu showed the highest catalytic activity at 473 K among the tested catalysts.…”

Section: Catalytic Activity For Steam Reforming Of Methanolmentioning

confidence: 97%

“…Sanches et al [44] observed a structureeactivity relationship between the catalyst structure and the activity for SRM, besides the correlation between the metallic area and the catalytic activity. They confirmed the structural changes by an increase in the Cu lattice expansion and Cu lattice microstrain that might be related to the formation of a CueZn alloy and the catalyst activity [44].…”

Section: Catalytic Activity For Steam Reforming Of Methanolmentioning

confidence: 99%

“…Compared with ZnO, ZrO 2 is highly dispersed on the catalyst surface and possesses a large number of surface hydroxyl groups, which can stabilize the Cu þ species and promote the catalytic activity [36]. It was also reported that the CueZn alloy formation and catalytic activity could be improved in the presence of Zr [44]. Consequently, the addition of ZrO 2 to the Cu/Zn/Al 2 O 3 catalysts was reported to improve the performance in terms of methanol conversion, hydrogen yield, suppression of CO formation, and stability [18].…”

Section: Catalytic Activity For Steam Reforming Of Methanolmentioning

confidence: 99%

See 2 more Smart Citations

Steam reforming of methanol over Cu/ZnO/ZrO2/Al2O3 catalyst

Park

Yim

Kim

et al. 2014

International Journal of Hydrogen Energy

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Section: Catalytic Activity For Steam Reforming Of Methanolmentioning

confidence: 97%

Section: Catalytic Activity For Steam Reforming Of Methanolmentioning

confidence: 99%

Section: Catalytic Activity For Steam Reforming Of Methanolmentioning

confidence: 99%

See 1 more Smart Citation

Steam reforming of methanol over Cu/ZnO/ZrO2/Al2O3 catalyst

Park

Yim

Kim

et al. 2014

International Journal of Hydrogen Energy

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“…The temperature programmed desorption with H2 was per formed to evaluate the surface copper area the dispersion of copper. This technique was used as an alternative to the N2O chemisorption since N2O multilayer adsorption on copper oxide and N2O dissociation by other catalyst components have been reported [26,28,29]. Additionally, the utilization of the H2 TPD procedure appears to be easier and precise when compared to other methods.…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

CuO/ZnO catalysts for methanol steam reforming: The role of the support polarity ratio and surface area

Mateos-Pedrero

Silva

Tanaka

et al. 2015

Applied Catalysis B: Environmental

119

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The effect of surface area and polarity ratio of ZnO support on the catalytic properties of CuO/ZnO catalyst for methanol steam reforming (MSR) are studied. The surface area of ZnO was varied changing the calcination temperature, and its polarity ratio was modified using different Zn precursors, zinc acetate and zinc nitrate. It was found that the copper dispersion and copper surface area increase with the surface area of the ZnO support, and the polarity ratio of ZnO strongly influences the reducibility of copper species. A higher polarity ratio promotes the reducibility, which is attributed to a strong interaction between copper and the more polar ZnO support. Interestingly, it was observed that the selectivity of CuO/ZnO catalysts (lower CO yield) increases with the polarity ratio of ZnO carriers. As another key result, CuO/ZnOAc375 catalyst has proven to be more selective (up to 90%) than a reference CuO/ZnO/Al2O3 sample (G66-MR, Süd Chemie).The activity of the best performing catalyst, CuO/ZnOAc-375, was assessed in a Pd-composite membrane reactor and in a conventional packed-bed reactor. A hydrogen recovery of ca. 75% and a hydrogen permeate purity of more than 90% was obtained. The Pd-based membrane reactor allowed to improve the methanol conversion, by partially suppressing the methanol steam reforming backward reaction, besides upgrading the reformate hydrogen purity for use in HT-PEMFC.2

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“…The authors discussed the influence of catalyst modifications on the activity of methanol synthesis, dispersion of copper, surface composition of the catalyst and the stability of catalysts. Sanches et al (2012) studied Cu/ZnO catalyst with zirconium and yttrium as promoters. The promoter effects were evaluated -the yttrium promoter of Cu/ZnO catalyst did not provide textural or structural advantages while the zirconium led to both greater Cu dispersion and structural changes in the Cu lattice.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Characterisation of Catalysts for Methanol Synthesis

Ledakowicz¹,

Nowicki²,

Petera³

et al. 2013

Chemical and Process Engineering

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The results of activity studies of four catalysts in methanol synthesis have been presented. A standard industrial catalyst TMC-3/1 was compared with two methanol catalysts promoted by the addition of magnesium and one promoted by zirconium. The kinetic analysis of the experimental results shows that the Cu/Zn/Al/Mg/1 catalyst was the least active. Although TMC-3/1 and Cu/Zn/Al/Mg/2 catalysts were characterised by a higher activity, the most active catalyst system was Cu/Zn/Al/Zr. The activity calculated for zirconium doped catalyst under operating conditions was approximately 30% higher that of TMC-3/1catalyst. The experimental data were used to identify the rate equations of two types -one purely empirical power rate equation and the other one -the Vanden Bussche & Froment kinetic model of methanol synthesis. The Cu/ZnO/Al 2 O 3 catalyst modified with zirconium has the highest application potential in methanol synthesis.

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Influence of preparation methods and Zr and Y promoters on Cu/ZnO catalysts used for methanol steam reforming

Cited by 57 publications

References 34 publications

Steam reforming of methanol over Cu/ZnO/ZrO2/Al2O3 catalyst

Steam reforming of methanol over Cu/ZnO/ZrO2/Al2O3 catalyst

CuO/ZnO catalysts for methanol steam reforming: The role of the support polarity ratio and surface area

Kinetic Characterisation of Catalysts for Methanol Synthesis

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