Influence of precipitation conditions on precursor particle size distribution and activity of Cu/ZnO methanol synthesis catalyst

Farahani, Bahman Vasheghani; Rajabi, F. H.; Bahmani, Mohsen; Ghelichkhani, Marzieh; Sahebdelfar, Saeed

doi:10.1016/j.apcata.2014.05.034

Cited by 37 publications

(19 citation statements)

References 26 publications

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“…SEM analysis confirmed these differences (Figures 1(f), 1(g) and 1(h)). These effects of the salt molar ratio and the mixing method on the characteristics of the raw catalyst are in line with those reported in the literature [3,6].…”

Section: Catalyst Characterizationsupporting

confidence: 78%

“…In the aging process, the structure of the precipitate changed from amorphous to crystalline [4][5][6]. This phenomenon was also observed in our experiments with the change in color of the precipitate from blue to green.…”

Section: Catalyst Characterizationsupporting

confidence: 68%

“…Meanwhile, during precipitation using Cu,Zn-nitrates and sodium-carbonate a decrease in pH is observed after 22 minutes, which then slowly increases back to its original value. This change in pH indicates the change in solid phase from amorphous to crystalline phase of rosasite (Cu,Zn) 2 CO 3 (OH) 2 and aurichalcite (Cu,Zn) 5 CO 3 (OH) 6 .…”

Section: Introductionmentioning

confidence: 99%

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Influence of Impregnation and Coprecipitation Method in Preparation of Cu/ZnO Catalyst for Methanol Synthesis

Prasetyaningsih¹,

Hendriyana

Susanto

2016

J. Eng. Technol. Sci.

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Abstract. Cu/ZnO catalyst was succesfully prepared using a coprecipitation method. The mixing procedure of the Cu(NO 3 ) 2 , Zn(NO 3 ) 2 and Na 2 CO 3 solutions had an important influence on the characteristics of the catalyst. The best catalyst obtained was the one prepared with slow mixing of the salt solutions and a CuO/ZnO molar ratio of 50:50. This raw catalyst had a maximum surface area of about 61.6 m 2 /g. Increasing the CuO/ZnO molar ratio caused an agglomeration of precipitated particles, reducing the surface area. A much better catalyst was obtained using an impregnation method, in which -Al 2 O 3 was used as support. The impregnated catalyst had a surface area of about 151 m 2 /g. Activity tests were carried out in a fixed-bed reactor containing 1 g of catalyst and a flow of syngas at a rate of 60 mL/min. The reaction temperature was 170°C and the pressure was 20 barg. The best coprecipitated catalyst gave a CO conversion of about 10%, while the impregnated catalyst gave a CO conversion of up to 69%.

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Section: Catalyst Characterizationsupporting

confidence: 78%

Section: Catalyst Characterizationsupporting

confidence: 68%

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Influence of Impregnation and Coprecipitation Method in Preparation of Cu/ZnO Catalyst for Methanol Synthesis

Prasetyaningsih¹,

Hendriyana

Susanto

2016

J. Eng. Technol. Sci.

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“…Therefore, one of the challenges of catalyst's design is the substitution of noble metals [20] with more common and less expensive alternatives while maintaining high catalytic efficiency. Cu, Ni and Cu-Ni supported on activated carbon has been used in methanol [21], dimethyl carbonate [22], and diethyl carbonate synthesis [23] and in principle are also suitable for the WGS reaction [24]. Nowadays, Cu and Ni metals supported on SiO 2 [25], Al 2 O 3 [26], CeO 2 [27] and ZrO 2 [28], have been widely employed as heterogeneous catalysts for the water gas shift reaction.…”

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confidence: 99%

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Arbeláez

Reina

Ivanova

et al. 2015

Applied Catalysis A: General

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Highlights-Efficient Cu-Ni catalysts supported on activated carbon for the water gas shift reaction.-Supressed methanation activity due to the presence of Cu.-Cu-Ni alloy as a key factor of the catalytic design.-Good stability and tolerance towards start/stop situations. AbstractThe water-gas shift (WGS) reaction over structured Cu, Ni, and bimetallic Cu-Ni supported on active carbon (AC) catalysts was investigated. The structured catalysts were prepared in pellets form and applied in the medium range WGS reaction. A good activity in the 180-350 °C temperature range was registered being the bimetallic Cu-Ni:2-1/AC catalyst the best catalyst. Page 2 of 38A c c e p t e d M a n u s c r i p tThe presence of Cu mitigates the methanation activity of Ni favoring the shift process. In addition the active carbon gasification reaction was not observed for the Cu-containing catalyst converting the active carbon in a very convenient support for the WGS reaction. The stability of the bimetallic Cu-Ni:2-1/AC catalyst under continuous operation conditions, as well as its tolerance towards start/stop cycles was also evaluated.

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“…Interestingly, it was observed that ZnO could cover the surface acidity of the alumina support and further enhance the reducibility of supported metal particles [21][22][23][24]. Not only for better metal dispersion and size control [25], the strong interaction between ZnO and metal particles could also prevent sintering and catalytic poisoning under operating conditions [26][27].…”

Section: Introductionmentioning

confidence: 99%

Catalytic steam reforming of volatiles released via pyrolysis of wood sawdust for hydrogen-rich gas production on Fe–Zn/Al2O3 nanocatalysts

Chen

Dong

et al. 2015

Fuel

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Abstract:Thermo-chemical processing of biomass is a promising alternative to produce renewable hydrogen as a clean fuel or renewable syngas for a sustainable chemical industry. However, the fast deactivation of catalysts due to coke formation and sintering limits the application of catalytic thermo-chemical processing in the emerging bio-refining industry. In this research, Fe-Zn/Al 2 O 3 nanocatalysts have been prepared for the production of hydrogen through pyrolysis catalytic reforming of wood sawdust. Through characterization, it was found that Fe and Zn were well distributed on the surface with a narrow particle size. During the reactions, the yield of hydrogen increased with the increase of Zn content, as Zn is an efficient metal promoter for enhancing the performance of the Fe active site in the reaction. The 20% Fe/Al 2 O 3 catalyst with Zn/Al ratio of 1:1 showed the best performance in the process in relation to the hydrogen production and resistance to coke formation on the surface of the reacted catalyst. All the catalysts showed ultra-high stability during the process and nearly no sintering were observed on the used catalysts. Therefore, the nanocatalysts prepared in this work from natural-abundant and low-cost metals have promising catalytic properties (high metal dispersion and stability) to produce H 2 -rich syngas with optimal H 2 /CO ratio from the thermo-chemical processing of biomass.

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Influence of precipitation conditions on precursor particle size distribution and activity of Cu/ZnO methanol synthesis catalyst

Cited by 37 publications

References 26 publications

Influence of Impregnation and Coprecipitation Method in Preparation of Cu/ZnO Catalyst for Methanol Synthesis

Influence of Impregnation and Coprecipitation Method in Preparation of Cu/ZnO Catalyst for Methanol Synthesis

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Catalytic steam reforming of volatiles released via pyrolysis of wood sawdust for hydrogen-rich gas production on Fe–Zn/Al2O3 nanocatalysts

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