A comparison of Raney copper-zinc and coprecipitated copper-zinc-aluminium oxide methanol syntheses catalysts

Bridgewater, A.J.; Wainwright, Mark; Young, David J.

doi:10.1016/s0166-9834(00)82508-7

Cited by 33 publications

(8 citation statements)

References 18 publications

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“…The H δ+ and H δ -ions required for the catalytic process are provided by the homogeneous splitting of hydrogen at the promoter, usually zinc oxide (ZnO) [6]. Some research groups claim that metallic Cu atoms act as active sites in methanol synthesis [7][8][9]. Pan et al [10] and Rasmussen et al [11,12] were able to demonstrate a direct proportional relationship between the activity of the catalyst and the surface of metallic copper.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Modification, and Characterization of CuO/ZnO/ZrO2 Mixed Metal Oxide Catalysts for CO2/H2 Conversion

et al. 2019

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CuO/ZnO/ZrO2 catalyst systems were synthesized in different ways and comprehensively characterized in order to study synthesis-to-property relations. A series of catalyst samples was prepared by coprecipitation, one-pot synthesis, and wet impregnation. The coprecipitation of multicomponent precipitates is usually a preliminary stage for preparation of mixed oxide catalysts. Cetyltrimethylammonium bromide (CTAB) was used in the surfactant-supported coprecipitation to improve the structural or textural characteristics of the catalytic samples. In the one-pot synthesis, all necessary components are simultaneously converted by evaporation from solutions into solids. During the wet impregnation, zirconium hydroxide is loaded with metal salts. After thermal treatment, all samples formed pure metal oxide forms, which was confirmed by XRD. The specific surface area of the investigated samples and their porous texture were determined by nitrogen adsorption. The reducibility of metal oxides and the kind of CuO phase was characterized by temperature-programmed reduction (TPR), and the surface acid properties by temperature-programmed ammonia desorption (TPAD). The CuO/ZnO/ZrO2 sample with the highest amount of strong acid sites is characterized by the formation of large CuO particles combined with the worst reducibility so that potentially catalytic active Cu/CuO pairs can be formed. One catalyst system was further characterized by in situ diffuse reflection Fourier transform infrared spectroscopy (DRIFTS) to identify surface intermediate species, which may occur during the conversion of CO2/H2 to methanol.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Modification, and Characterization of CuO/ZnO/ZrO2 Mixed Metal Oxide Catalysts for CO2/H2 Conversion

et al. 2019

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“…The Cu/ZnO (3) catalyst is used for the commercial production of methanol from CO and H2. There are new findings regarding the roles of CO2 and ZnO (4). The weak binding of linear CO as found on Cure single crystals means that at practical temperatures, 250~ of operation of Cu/ZnO methanol synthesis reactors, CO would be thermally desorbed from the unoxidized metal.…”

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confidence: 99%

Electrochemical Reduction of CO 2 at Intentionally Oxidized Copper Electrodes

Frese¹

1991

J. Electrochem. Soc.

217

176

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We observed CO2 reduction to CH3OH at various oxidized copper electrodes at 22~ The electrode types included anodized Cu foil, Cu foil thermally oxidized in air, and air-oxidized Cu electrodeposited on anodized or air-oxidized Ti foil. The highest rates to date, 1 • 10 4 mol cm -2 h -1 (geometrical area), were found using anodized Cu in 0.5M KHCO3, pH = 7.6, and -1.9 V (SCE). Faradaic yields for CH3OH depended on the current and reached about 240%. The onset potential for CH3OH formation was near -0.4 V (SCE). Hydrogen gas and small amounts of CO were also formed. A mechanism is proposed involving chemical reduction steps up to HCOad, followed by three hydiogenation steps to CH3OH. Absorption of oxygen by Cure is implied. The stability of p-Cu20 semiconductor films is discussed in terms of breakdown currents d/le to band-to-band tunneling. The major impurities deposited on the Cu electrode during electrolysis are Zn and Fe at several atom percent each. An 8% level of C1 was found, originating from the HC1 etch used to remove the native oxide before thermal oxidation.

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“…Also, the initial activity of the catalyst depends completely on the operating conditions and its composition. Many researchers [8,16,17] have reported that the metallic Cu atoms are active for methanol synthesis. The activity of the catalyst is directly proportional to the surface area of metallic Cu and methanol is formed on a metallic Cu surface of a Cu-based catalyst [18] and the activity increases with increase in the metallic copper surface area [19].…”

Section: Resultsmentioning

confidence: 99%

Influence of Ga addition on the methanol synthesis activity of Cu/ZnO catalyst in the presence and absence of alumina

Kang

Bae

Prasad

et al. 2009

Journal of Industrial and Engineering Chemistry

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A comparison of Raney copper-zinc and coprecipitated copper-zinc-aluminium oxide methanol syntheses catalysts

Cited by 33 publications

References 18 publications

Synthesis, Modification, and Characterization of CuO/ZnO/ZrO2 Mixed Metal Oxide Catalysts for CO2/H2 Conversion

Synthesis, Modification, and Characterization of CuO/ZnO/ZrO2 Mixed Metal Oxide Catalysts for CO2/H2 Conversion

Electrochemical Reduction of CO 2 at Intentionally Oxidized Copper Electrodes

Influence of Ga addition on the methanol synthesis activity of Cu/ZnO catalyst in the presence and absence of alumina

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