Methanol steam reforming over ex-hydrotalcite Cu–Zn–Al catalysts

Busca, Guido; Costantino, U.; Marmottini, Fabio; Montanari, Tania; Patrono, P.; Pinzari, F.; Ramis, Gianguido

doi:10.1016/j.apcata.2006.05.028

Cited by 82 publications

(58 citation statements)

References 28 publications

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“…The key is to keep a high dispersion of the Cu/Zn crystallites where the active sites are [7][8][9][10][11][12][13][14][15][16][17][18][19]. Some works seek to improve the dispersion of the conventional Cu/Zn/Al catalyst by using complicated preparation procedure or expensive organic solvents.…”

Section: Introductionmentioning

confidence: 99%

A Cu/Zn/Al/Zr Fibrous Catalyst that is an Improved CO2 Hydrogenation to Methanol Catalyst

Zuo

et al. 2007

Catal Lett

126

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A series of Cu/Zn/Al/Zr CO 2 hydrogenation to methanol catalysts containing different ratios of Al/Zr were prepared using a co-precipitation procedure. SEM, TEM, and XRD characterization showed that all the catalysts comprised crystallites in a fibrous structure and their Cu/Zn crystallite dispersions were better than that of a commercial (COM) catalyst. It is suggested that the high dispersion and stability of the Cu/Zn crystallites due to the fibrous structure enhanced CO 2 hydrogenation, and the added Zr component further improved the catalyst. A 5% Zr addition gave a methanol space time yield 80% higher than that on the COM catalyst.

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Section: Introductionmentioning

confidence: 99%

A Cu/Zn/Al/Zr Fibrous Catalyst that is an Improved CO2 Hydrogenation to Methanol Catalyst

Zuo

et al. 2007

Catal Lett

126

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“…A contribution from methanol decomposition at the higher temperature can not be ruled out. 7,33 Different reaction mechanisms have been reported in literature which differ in the CO formation step: some of them consider that CO is a primary product formed from methanol decomposition (MD) followed by WGS; 34 others suggest that CO is a secondary product formed from reverse WGS 5,6 and those where the three reactions (SRM, WGS, MD) are included into the mechanism. 35 In Figure 7, methanol conversion as a function of W/F MeOH is illustrated.…”

Section: -26mentioning

confidence: 99%

“…[13][14][15][16][17] Patel and Pant have reported the use of CeO 2 to increase the copper dispersion and the thermal stability. 18 Besides, CeO 2 could decrease the CO concentration in the reformer effluent, 7,19 and favor the coke gasification. 20 It is also reported in literature that the Ce 1-x Cu x O 2-x solid solution could lead to a high Cu dispersion after reduction.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9] Cu-ZnO interactions have been reported to have a marked effect in catalytic activity due ZnO improved the metal dispersion and reducibility of Cu 2+ species. 8 However, these catalysts presented some inconveniences: high CO formation, low stability with time due to the tendency of copper sintering and their pyrophoric nature when they are exposed to oxidizing environments.…”

Section: Introductionmentioning

confidence: 99%

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Methanol steam reforming over Cu/CeO2 catalysts: influence of zinc addition

Tonelli¹,

Gorriz²,

Arrúa³

et al. 2011

Quím. Nova

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Recebido em 20/10/10; aceito em 17/3/11; publicado na web em 5/5/11Methanol steam reforming reaction was studied over Cu(5 wt.%)/CeO 2 with and without the presence of Zn. The Zn addition decreased the Cu +2 reducibility and increased the oxygen mobility of ceria. The main products were CO 2 and H 2 with small amount of CO. Selectivity to CO decreased with the Zn addition and it was lower at lower reaction temperatures and lower space velocities. At 230 ºC and W/F MeOH = 648 g min mol -1 selectivities to H 2 and to CO 2 were 100% on Zn/Cu/Ce. The catalytic results indicated that CO was mainly a secondary product formed from reverse water gas shift reaction.

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“…It is very likely that the basicity from d-HT is involved in C 2+ This study illustrates the possibility of a methanol-tooxygenate process using the Cu-ZnO/d-HT catalyst at mild conditions. Catalysts derived from hydrotalcites such as Cu-Zn-Al [53] or Cu-Mg-Al [54] have been tested for the production of hydrogen from methanol or the catalytic combustion of methane, but no formation of long-chain compounds was reported. The formation of higher alcohols from lower alcohols is possible to occur through aldol condensation and through Guerbet reaction.…”

Section: Resultsmentioning

confidence: 99%

Methanol to Long-chain Oxygenates Over Mg/Al Mixed Oxides Supported Cu Catalysts

Hsiao

Lin

2007

Catal Lett

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The synthesis of long-chain oxygenates (C 2+ ) from methanol is examined at atmospheric pressure and 523-673 K. The Cu-ZnO/d-HT (decomposed hydrotalcite) catalyst shows ca. 10% yield of C 2+ at 573 K and a weight hourly space velocity of 0.2 h -1 ; whereas, no C 2+ is formed over Cu/d-HY, Cu-MgO/Al 2 O 3 , Cu-ZnO/Al 2 O 3 , or a commercial Cu/ZnO methanol synthesis catalyst. The role of the synergistic effect of Cu, ZnO and the basicity of d-HT and the possible reaction intermediates for the C 2+ synthesis are discussed.

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Methanol steam reforming over ex-hydrotalcite Cu–Zn–Al catalysts

Cited by 82 publications

References 28 publications

A Cu/Zn/Al/Zr Fibrous Catalyst that is an Improved CO2 Hydrogenation to Methanol Catalyst

A Cu/Zn/Al/Zr Fibrous Catalyst that is an Improved CO2 Hydrogenation to Methanol Catalyst

Methanol steam reforming over Cu/CeO2 catalysts: influence of zinc addition

Methanol to Long-chain Oxygenates Over Mg/Al Mixed Oxides Supported Cu Catalysts

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