Effect of Al-containing precursors on Cu/ZnO/Al2O3 catalyst for methanol production

Zhang, Fan; Liu, Yuan; Xu, Xiaoying; Yang, Panpan; Miao, Ping; Zhang, Yulong; Sun, Qi

doi:10.1016/j.fuproc.2018.04.021

Cited by 43 publications

(19 citation statements)

References 31 publications

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“…The result in TPR profile showed that the characteristics peak appeared in the temperature ranging from 220 to 275 C, corresponding to the reduction of different CuO species as follows. Firstly, the reduction of highly dispersed copper oxides (CuO) was observed at the low temperature reduction peak (α peak) (Zhang et al, 2018;Dasireddy and Likozar, 2019). Secondly, high temperature reduction (β peak) indicated the reduction of bulk CuO (Zhang et al, 2018;Dasireddy and Likozar, 2019).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…Firstly, the reduction of highly dispersed copper oxides (CuO) was observed at the low temperature reduction peak (α peak) (Zhang et al, 2018;Dasireddy and Likozar, 2019). Secondly, high temperature reduction (β peak) indicated the reduction of bulk CuO (Zhang et al, 2018;Dasireddy and Likozar, 2019). The TPR profile of CZA-H showed two major reduction peaks at low temperature for α peak including peaks at 205 C and 233 C that were attributed to the CuO dispersion and direct interaction between CuO species and ZnO species (Hu et al, 2018;Sadeghinia et al, 2020).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Kamsuwan

Krutpijit

Praserthdam

et al. 2021

Heliyon

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Comparative study of Cu/ZnO/Al 2 O 3 (CZA) catalysts with different Cu loading in CO and CO 2 hydrogenation at 250 C under atmospheric pressure was investigated. Results showed that methanol was the major product for CO hydrogenation, while the main product for CO 2 hydrogenation was CO. High Cu loading catalyst exhibited high catalytic activity in both CO and CO 2 hydrogenation. Low Cu loading catalyst showed deactivation with time on stream after 1-2 h by coke formation containing both amorphous and graphitic cokes for both CO and CO 2 hydrogenation.

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Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Kamsuwan

Krutpijit

Praserthdam

et al. 2021

Heliyon

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“…Obviously, all Cu-based catalysts presented a H 2 asymmetric reduction peak in the range of 100–300 °C, which exhibited two predominant H 2 reduction peaks. Two reduction peaks in the TPR profiles are assigned to the chemical environment of CuO species with several states: 3 (i) the reduction peak at the lower temperatures below 250 °C (α peak) is attributed to the highly dispersed CuO, suggesting the strong interaction between Cu and ZnO 22 , 43 and (ii) the high temperature reduction peak (β peak) is ascribed to the reduction of bulk CuO (core layer of CuO, CuO → Cu 2 O → Cu 0 ) and the interaction of isolated CuO in bulk ZnO. 1 , 3 , 22 , 23 As presented in Figure 3 a,b, the reduction peaks of all spent catalysts exhibited similar kinds of reduction patterns with a single peak, except for CZA-H(CO) that showed two peak regions the same as the fresh CZA-H catalyst.…”

Section: Resultsmentioning

confidence: 99%

Differences in Deterioration Behaviors of Cu/ZnO/Al₂O₃ Catalysts with Different Cu Contents toward Hydrogenation of CO and CO₂

et al. 2022

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The deterioration behaviors of Cu/ZnO/Al 2 O 3 (CZA) catalysts upon different Cu contents were elucidated. The fresh and spent catalysts after being used in CO and CO 2 hydrogenation at 250 °C under atmospheric pressure were properly characterized using various techniques including X-ray powder diffraction, X-ray photoelectron spectroscopy, and temperature-programmed reduction for the changes of metal sites, while the textural and chemical properties and carbon deposition on spent CZA catalysts were analyzed by N 2 physisorption, energy-dispersive X-ray spectroscopy, and temperature-programmed oxidation. During the hydrogenation reaction for both CO and CO 2 , the unstable Cu 0 site on the spent CZA catalyst having a low Cu loading (sCZA-L) was oxidized to CuO and the aggregation of metal crystallite sites (Cu-ZnO and ZnO) was observed. Moreover, the amount of carbon deposition on sCZA-L (ca. >2%) is higher than the spent CZA catalyst having a high Cu loading (sCZA-H, ca. <0.5%). These phenomena led to a decrease in the surface area and the blockage of active sites. These findings can be determined on the catalytic deactivation and the obvious decrease in the catalytic activity of the CZA catalyst having a low Cu content (CZA-L, Cu:Zn = 0.8).

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“…Methanol synthesis is generally performed at elevated temperatures (473-573 K) and pressures (40-100 bar), while exposing a Cu/ZnO/Al2O3 catalyst to a syngas feed containing a small amount of CO2. 86,87 The copper (Cu) species are the main active component in this catalyst, while partially reduced zinc oxide (ZnOx) has a promoting function 88,89 , and alumina (Al2O3) plays a role in the structural stability 71,[90][91][92] . Characteristic for copper is its high selectivity (typically more than 98%) towards methanol, attributed to its limited ability to dissociate CO and to form C-C bonds, thereby also suppressing carbon deposition as a side product.…”

Section: Methanol Synthesismentioning

confidence: 99%

“…86,87 Cu is the main active component in this catalyst, which is promoted by ZnOx, whereas Al2O3 mainly serves for structural stability. [88][89][90][91] Other catalyst formulations such as Cu nanoparticles supported on ZrO2 107 , GaOx 91 , and CeOx 204 or in the presence of Al, Ga, Mg, Mn, and/or Zr 93,233,234 , NiGax/SiO2 259,260 , GaPd2/SiO2 261 , and In2O3/ZrO2 262 have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Copper Catalysts for Synthesis Gas Conversion - Promoter and Support Effects

Dalebout¹

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When someone has heard of a catalyst before, it has often been explained as a car part that cleans the exhaust gases. However, there are many more types of catalysts used in the industrial production of almost any chemical, ranging from enzymes (biocatalysis) for the production of medicines to solid catalysts for gasoline and plastics production. 1,2 A catalyst is in general a substance that is used to accelerate a chemical reaction from starting compound A to desired product B by lowering the activation barrier (figure 1.1A), while the substance itself is not consumed. 3 For example, inside the three-way catalytic converter in gasoline-type cars several catalyzed reactions simultaneously occur: hydrocarbons, carbon monoxide (CO), and nitrogen oxides (NOx) in the high exhaust stream are converted into the less harmful carbon dioxide (CO2), water (H2O), and nitrogen gas (N2). 4 Here, we focus on heterogeneous catalysts, which are solid catalysts used in liquid-or gas-phase reactions. The active compound in heterogeneous catalysts is often a metal (oxide or sulfide). Figure 1.1 (A) Energy diagram of a catalyzed and non-catalyzed chemical reaction with Eact representing the activation energy. (B) Transfer of electron density from the d-band of a metal to an anti-bonding orbital of a reactant (here σ* of an H2 molecule). Back-donation (as indicated by the arrow) induces bond breaking. Adapted from ref. [3]. (C) Different binding modes of a CO molecule on a metal surface. 493 60 2,000 b 12.4 50.7 42.6 6.3 [177] a N-C = ordered mesoporous nitrogen-doped carbon, KIT-6 = ordered mesoporous silica, last entry = physical mixture. b In mL gcat -1 h -1 . c C2+OH = higher alcohols, HC = hydrocarbons. d Without taking CO2 into account.

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Effect of Al-containing precursors on Cu/ZnO/Al2O3 catalyst for methanol production

Cited by 43 publications

References 31 publications

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Differences in Deterioration Behaviors of Cu/ZnO/Al₂O₃ Catalysts with Different Cu Contents toward Hydrogenation of CO and CO₂

Copper Catalysts for Synthesis Gas Conversion - Promoter and Support Effects

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Effect of Al-containing precursors on Cu/ZnO/Al2O3 catalyst for methanol production

Cited by 43 publications

References 31 publications

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Differences in Deterioration Behaviors of Cu/ZnO/Al2O3 Catalysts with Different Cu Contents toward Hydrogenation of CO and CO2

Copper Catalysts for Synthesis Gas Conversion - Promoter and Support Effects

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Differences in Deterioration Behaviors of Cu/ZnO/Al₂O₃ Catalysts with Different Cu Contents toward Hydrogenation of CO and CO₂