Cu/ZnO/Al2O3 catalysts for oxidative steam reforming of methanol: The role of Cu and the dispersing oxide matrix

Turco, Maria Caterina; Bagnasco, G.; Cammarano, Claudia; Senese, Pasquale; Costantino, U.; Sisani, Michele

doi:10.1016/j.apcatb.2007.07.006

Cited by 193 publications

(89 citation statements)

References 77 publications

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“…280 ºC (P1) and 320 ºC (P2). According to other published works [19][20][21] and reference 18 of the present study), the presence of two reduction signals in bulk…”

Section: -11-2017mentioning

confidence: 99%

Low-temperature methanol steam reforming kinetics over a novel CuZrDyAl catalyst

Silva

Mateos-Pedrero

Ribeirinha

et al. 2015

Reac Kinet Mech Cat

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A kinetic study within the low-temperature methanol steam reforming (MSR) reaction range (170 ºC -200 ºC) was performed over a novel CuZrDyAl catalyst. The physicochemical and catalytic properties of the CuZrDyAl catalyst were compared with those of a conventional CuO/ZnO/Al 2 O 3 (G66 MR, Süd-Chemie) sample, taken as reference. The in-house catalyst displays better performances, in terms of methanol conversion and H 2 production, than the reference G66 MR sample.Interestingly, the in-house catalyst is significantly more selective (namely, yielding lower CO concentration) than the commercial one, which gives extra interest for producing fuel cell grade hydrogen. Physicochemical characterization evidences that the in-house catalyst have improved reducibility of copper species compared with the G66-MR, which might account for its better performances.The parameters of a simple power-law equation and two mechanistic kinetic models were determined by non-linear regression, minimizing the sum of the residual squares; the best fitting with the experimental data was obtained when using Model 3, based on the reported work from Peppley et al. [10] for the commercial CuO/ZnO/Al 2 O 3 .This article was published in Reaction Kinetics, Mechanisms and Catalysis, 115(1), 321-339, 2015 http://dx.doi.org/10.1007/s11144-015-0846-z 03-11-2017 2 Noteworthy, is the scarce number of MSR kinetic studies at such lower temperature range.

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“…280 ºC (P1) and 320 ºC (P2). According to other published works [19][20][21] and reference 18 of the present study), the presence of two reduction signals in bulk…”

Section: -11-2017mentioning

confidence: 99%

Low-temperature methanol steam reforming kinetics over a novel CuZrDyAl catalyst

Silva

Mateos-Pedrero

Ribeirinha

et al. 2015

Reac Kinet Mech Cat

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“…[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. The effects of CeO 2 and ZrO 2 on CuO-ZnO-Al 2 O 3 catalysts have been also studied.…”

Section: Introductionmentioning

confidence: 99%

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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“…Among all the prepared catalysts, SiO 2 supported catalyst showed a broad peak below 200°C with the lowest strength of total acidity of 0.1547 mmol g -1 in terms of NH 3 desorbed. In case of Al 2 O 3 supported catalyst, a broad distribution of acidity all over the temperature range of 100-700°C was observed which clearly suggests the presence of weak, moderate as well as strong acidic sites [37]. MCM-41 supported Zn catalyst showed only a single broad peak below 200°C indicating the presence of weak acid sites.…”

Section: Catalyst Characterizationmentioning

confidence: 94%

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

et al. 2017

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Glycerol carbonylation with urea is a very feasible option to produce glycerol carbonate with a net result of CO 2 fixation through urea synthesis. The prerequisite of an efficient catalyst for this reaction is to possess both acid and basic sites together. Several acidic supports were screened for ZnO catalyst in this work and Zn/MCM-41 was found to exhibit the best activity and almost complete selectivity to glycerol carbonate (GC). Although, non-catalytic glycerol carbonylation resulted in GC formation but glycerol conversion achieved was twice with Zn/MCM-41 as a catalyst. Further to that increase in Zn loading from 2 to 5% resulted in increase in glycerol conversion from 63 to 82%. The prepared catalysts were characterized by XRD, NH 3 and CO 2 -TPD and effects of reaction parameters such as catalyst loading, glycerol to urea mole ratio and temperature on glycerol conversion and GC selectivity in batch mode of operation were also studied. Time on stream activity of 5% Zn/MCM-41 catalyst for continuous carbonylation of glycerol was also studied for *100 h with an average conversion of *55% and complete selectivity to GC. This indicated five times lower productivity of GC per h due to lower residence time than that in a batch operation as compared to that of a continuous operation. Activation energy estimated from the Arrhenius plot was found to be 39.82 kJ mol -1 suggesting that the reaction is kinetically controlled. A reaction pathway mediated by acid and basic sites of the Zn/MCM-41 catalyst is also proposed.

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Cu/ZnO/Al2O3 catalysts for oxidative steam reforming of methanol: The role of Cu and the dispersing oxide matrix

Cited by 193 publications

References 77 publications

Low-temperature methanol steam reforming kinetics over a novel CuZrDyAl catalyst

Low-temperature methanol steam reforming kinetics over a novel CuZrDyAl catalyst

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

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

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