Kinetics of catalytic conversion of methanol at higher pressures

Bartoň, Jaroslav; Pour, V.

doi:10.1135/cccc19803402

Cited by 29 publications

(9 citation statements)

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“…In contrast, CuZnAl‐S‐600 and CuZnAl‐C‐600 that were derived from HTLcs synthesized using sulfates and chlorides of copper and zinc were inactive for the MSR reaction, affording methanol conversion less than 10%. Barton and Pour38 reported that the presence of trace S and Cl ( e.g ., 5 μg/g) in the feed stream can fast deactivate the MSR CuZnAl catalysts. They also suggested that the observation of the deactivation is due to the formation of volatile copper chloride compound or ZnS 38.…”

Section: Resultsmentioning

confidence: 99%

“…Barton and Pour38 reported that the presence of trace S and Cl ( e.g ., 5 μg/g) in the feed stream can fast deactivate the MSR CuZnAl catalysts. They also suggested that the observation of the deactivation is due to the formation of volatile copper chloride compound or ZnS 38. In our cases, the residual contents of S and Cl for CuZnAl‐S‐600 and CuZnAl‐C‐600 catalysts were determined to be 3.1 by ICP and 0.45 mg/g by ion chromatography, probably far beyond the endurable level for CuZnAl catalysts for the MSR reaction.…”

Section: Resultsmentioning

confidence: 99%

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High‐performance HTLcs‐derived CuZnAl catalysts for hydrogen production via methanol steam reforming

Tang¹,

Liu²,

Zhu³

et al. 2009

AIChE Journal

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A series of CuZnAl oxide-composite catalysts were prepared via decomposition of CuZnAl hydrotalcite-like compounds (HTLcs). The catalysts derived from CuZnAl HTLcs (Cu: 37%, Zn: 15%, Al: 48% mol; using metal nitrate or acetate precursors) at 600 C provided excellent activity and stability for the methanol steam reforming. CuZnAl HTLcs were almost decomposed completely at 600 C to form highly dispersed CuO with large specific surface area while forming CuAl 2 O 4 spinel that played a key role in separating and stabilizing the nano-sized Cu and ZnO during the reaction. The CuZnAl catalyst prepared from metal acetates could highly convert H 2 O/MeOH (1.3/1, mol/mol) mixture into hydrogen with only $0.05% CO at 250 C or $0.005% at 210 C. It is evidenced that the former afforded stronger Cu-ZnO interaction, which might be the intrinsic reason for the significant promotion of catalyst selectivity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High‐performance HTLcs‐derived CuZnAl catalysts for hydrogen production via methanol steam reforming

Tang¹,

Liu²,

Zhu³

et al. 2009

AIChE Journal

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“…Many studies [16][17][18][19][20][21][22][23][24][25][26][27][28] have focused on copper-based catalysts which exhibit a high reactivity and favorable selectivity to CO 2 and H 2 . However, the Cu-based catalysts can readily undergo deactivation at high temperature [29] (C553 K) due to metal sintering and their pyrophoric nature makes them undesirable for safe and efficient operation of PEM fuel cells.…”

Section: Introductionmentioning

confidence: 99%

CO/FTIR Spectroscopic Characterization of Pd/ZnO/Al2O3 Catalysts for Methanol Steam Reforming

et al. 2008

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An as-synthesized 8.8wt% Pd/ZnO/Al 2 O 3 catalyst was either pretreated under O 2 at 773 K followed by H 2 at 293 K or under H 2 at 773 K to obtain, respectively, a supported metallic Pd°catalyst (Pd°/ZnO/Al 2 O 3 ) or a supported PdZn alloy catalyst (PdZn/ZnO/Al 2 O 3 ). Both catalysts were studied by CO adsorption using FTIR spectroscopy. For the supported PdZn alloy catalyst (PdZn/ ZnO/Al 2 O 3 ), exposure to a mixture of methanol and steam, simulating methanol steam reforming reaction conditions, does not change the catalyst surface composition. This implies that the active sites are PdZn alloy like structures. The exposure of the catalyst to an oxidizing environment (O 2 at 623 K) results in the break up of PdZn alloy, forming a readily reducible PdO with its metallic form being known as much less active and selective for methanol steam reforming. However, for the metallic Pd°/ZnO/ Al 2 O 3 catalyst, FTIR results indicate that metallic Pd°can transform to PdZn alloy under methanol steam reforming conditions. These results suggest that PdZn alloy, even after an accidental exposure to oxygen, can self repair to form the active PdZn alloy phase under methanol steam reforming conditions. Catalytic behavior of the PdZn/ZnO/ Al 2 O 3 catalyst also correlates well with the surface composition characterizations by FTIR/CO spectroscopy.

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“…In the literature, copper-based catalysts have received considerable attention for production of H 2 by SRM [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Recent papers have discussed the POM reaction [22][23][24], as well as the combined process for production of H 2 [25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

Agrell

Birgersson

Boutonnet

et al. 2003

Journal of Catalysis

364

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Kinetics of catalytic conversion of methanol at higher pressures

Cited by 29 publications

References 0 publications

High‐performance HTLcs‐derived CuZnAl catalysts for hydrogen production via methanol steam reforming

High‐performance HTLcs‐derived CuZnAl catalysts for hydrogen production via methanol steam reforming

CO/FTIR Spectroscopic Characterization of Pd/ZnO/Al2O3 Catalysts for Methanol Steam Reforming

Production of hydrogen from methanol over Cu/ZnO catalysts promoted by ZrO2 and Al2O3

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