The effect of alkali metals doping on properties of Cu/ZnO/Al2O3 catalyst for water gas shift

Kowalik, Paweł; Próchniak, Wiesław; Borowiecki, T.

doi:10.1016/j.cattod.2011.01.028

Cited by 34 publications

(22 citation statements)

References 11 publications

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“…According to this picture, RWGS and methanol synthesis follow parallel mechanisms and the higher sensitivity of the latter toward product inhibition by water furthermore suggest that different active surface sites are responsible for each reaction. This is consistent with the observation that Cs-doping of Cu catalysts can promote WGS [42] and at the same time poison methanol formation in favor of RWGS [43], thus allowing an independent tuning of both reactions. This observation holds promises with regard to the development of an effective CO 2 hydrogenation catalyst based on Cu/ZnO/Al 2 O 3 , on which RWGS is an undesired side reaction that should be suppressed.…”

Section: Methanol Synthesissupporting

confidence: 90%

Hydrogenation of CO2 to methanol and CO on Cu/ZnO/Al2O3: Is there a common intermediate or not?

Kunkes

Studt

Abild‐Pedersen

et al. 2015

Journal of Catalysis

271

211

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This work is dedicated to the memory and achievements of Dr. Haldor Topsøe.Keywords: H/D substitution Methanol Copper Reverse water gas shift DFT Kinetics Mechanism CO 2 hydrogenation a b s t r a c t H/D exchange experiments on a Cu/ZnO/Al 2 O 3 catalyst have shown that methanol synthesis and RWGS display a strong thermodynamic isotope effect, which is attributed to differences in the zero-point energy of hydrogenated vs. deuterated species. The effect is larger for methanol synthesis and substantially increases the equilibrium yield in deuterated syngas. In the kinetic regime of CO 2 hydrogenation, an inverse kinetic isotope effect of H/D substitution was observed, which is stronger for methanol synthesis than for CO formation suggesting that the two reactions do not share a common intermediate. Similar observations were also made on other catalysts such as Cu/MgO, Cu/SiO 2 , and Pd/SiO 2 . In contrast to CO 2 hydrogenation, the CO hydrogenation on Cu/ZnO/Al 2 O 3 did not show such a strong kinetic isotope effect indicating that methanol formation from CO 2 does not proceed via consecutive reverse water gas shift and CO hydrogenation steps. The inverse KIE is consistent with formate hydrogenation being the rate-determining step of methanol synthesis from CO 2 . Differences in the extent of product inhibition by water, observed for methanol synthesis and reverse water gas shift indicate that the two reactions proceed on different surface sites in a parallel manner. The consequences for catalyst design for effective methanol synthesis from CO 2 are discussed.

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Section: Methanol Synthesissupporting

confidence: 90%

Hydrogenation of CO2 to methanol and CO on Cu/ZnO/Al2O3: Is there a common intermediate or not?

Kunkes

Studt

Abild‐Pedersen

et al. 2015

Journal of Catalysis

271

211

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show abstract

“…Both reactions are promoted in the presence of catalysts containing copper and zinc oxide. 43 As identified in the literature, the methanol dehydration reaction is promoted at high temperature. 44,45 At the low temperature region, the methanol dehydration reaction proceeds slowly and low concentrations of water are produced.…”

Section: Iii) Water-gas Shift Reactionmentioning

confidence: 89%

Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO–ZnO–Al₂O₃/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions

Khoshbin

Haghighi

2014

Catal. Sci. Technol.

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“…The reduction of catalyst precursors was studied by the temperature-programmed reduction profile method in a Zielinski's non-gradient reactor [10], in a glass apparatus of own construction [11]. A sample of a catalyst of approximately 100 mg was reduced with a mixture containing about 5% H 2 /Ar, at a flow rate of 400ml/min, and the temperature gradient 8°C/min.…”

Section: Methods Of Workmentioning

confidence: 99%

The study on alkali-promoted Co-Mo/Al2O3 catalysts for water-gas shift process

Antoniak¹,

Kowalik²,

Ryczkowski

2010

Annales UMCS, Chemistry

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The following contribution presents the results of studies on the effects of alkali metals on the physicochemical properties and the effectiveness of a Co-Mo/Al2O3 catalyst for the water gas shift reaction. It has been shown that the addition of alkali metals modifies the properties of Co-Mo catalysts, resulting in a significant increase in activity of catalysts in water gas shift reaction. The greatest effect was observed in the case of sodiumpromoted reaction.

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The effect of alkali metals doping on properties of Cu/ZnO/Al2O3 catalyst for water gas shift

Cited by 34 publications

References 11 publications

Hydrogenation of CO2 to methanol and CO on Cu/ZnO/Al2O3: Is there a common intermediate or not?

Hydrogenation of CO2 to methanol and CO on Cu/ZnO/Al2O3: Is there a common intermediate or not?

Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO–ZnO–Al₂O₃/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions

The study on alkali-promoted Co-Mo/Al2O3 catalysts for water-gas shift process

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The effect of alkali metals doping on properties of Cu/ZnO/Al2O3 catalyst for water gas shift

Cited by 34 publications

References 11 publications

Hydrogenation of CO2 to methanol and CO on Cu/ZnO/Al2O3: Is there a common intermediate or not?

Hydrogenation of CO2 to methanol and CO on Cu/ZnO/Al2O3: Is there a common intermediate or not?

Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO–ZnO–Al2O3/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions

The study on alkali-promoted Co-Mo/Al2O3 catalysts for water-gas shift process

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Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO–ZnO–Al₂O₃/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions