Journal ArticleDOI
Characterization and evaluation of mesoporous high surface area promoted Ni- Al2O3 catalysts in CO2 methanation
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In this paper, mesoporous high surface area Ni-Al2O3 catalysts promoted with different transition metals (Cr, Fe, Mn, Cu, and Co) were synthesized via ultrasound-assisted co-precipitation method and their performance was explored in CO2 methanation process.Abstract:
In this research, mesoporous high surface area Ni-Al2O3 catalysts promoted with different transition metals (Cr, Fe, Mn, Cu, and Co) were synthesized via ultrasound-assisted co-precipitation method and their performance was explored in CO2 methanation process. The promoters can affect the textural and catalytic properties of the Ni-Al2O3 catalysts to some extent. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), temperature programmed reduction with hydrogen (H2-TPR), and N2 adsorption-desorption (BET) were used for the characterization of the prepared samples. From the BET results, it was found that the incorporation of 5 wt% of the promoter into Ni-Al2O3 catalysts caused a decrease in the surface area, NiAl2O4 crystalline size and an increase in the mean pore diameter and total pore volume. Among the samples, the catalyst modified by Mn, exhibited the higher catalytic activity and selectivity towards CH4, especially at low temperatures (200–350 °C). These results could be explained by highest Ni active sites dispersion of this catalyst and enhancement of the catalyst reducibility at the low temperatures. The effect of Mn content was also evaluated and the results revealed that the Ni-Al2O3 sample modified with 3 wt% Mn with the highest BET surface area and the lowest crystalline size possessed the best catalytic performance. To further investigate the influence of ultrasonic irradiation, the optimal catalyst was prepared with a conventional co-precipitation method and its textural and catalytic properties were compared with those obtained for the catalyst prepared with the ultrasonic assisted coprecipitation method. Also, 25Ni-3Mn-Al2O3 catalyst showed a stable performance at 350 °C for 10 h in the CO2 methanation reaction.read more
Citations
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Journal ArticleDOI
Recent Progresses in Constructing the Highly Efficient Ni Based Catalysts With Advanced Low-Temperature Activity Toward CO2 Methanation.
Chufei Lv,Leilei Xu,Mindong Chen,Yan Cui,Xueying Wen,Yaping Li,Cai-e Wu,Bo Yang,Zhichao Miao,Xun Hu,Qinghui Shou +10 more
TL;DR: The development of highly efficient Ni based catalysts with excellent low-temperature catalytic performances has become the research focus as well as challenge in this field.
Journal ArticleDOI
Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review.
TL;DR: In this paper, a review summarizes and critically discusses recent progress made in the field of bimetallic Ni-M (M = Fe, Co, Cu, Ru, Rh, Pt, Pd, Re) based catalyst development for the CO2 methanation reaction.
Journal ArticleDOI
Carbon dioxide methanation over Ni-Cu/SiO2 catalysts
TL;DR: In this paper, Ni-Cu/SiO2 catalysts prepared by wet impregnation were tested for the CO2 methanation in a fixed bed reactor at 1' atm, GHSV of 60000'mL, in the range of 200-400'°C.
Journal ArticleDOI
Enhanced low-temperature activity of CO2 methanation over ceria-promoted Ni-Al2O3 nanocatalyst
TL;DR: In this article, the influence of promoters (Zr, Ce, La, and Mo) on the structural properties and low temperature activity features of Ni-Al2O3 catalyst has been addressed in CO2 methanation reaction.
Journal ArticleDOI
Impacts of alkali or alkaline earth metals addition on reaction intermediates formed in methanation of CO2 over cobalt catalysts
Zhanming Zhang,Xiao Zhang,Lijun Zhang,Jingxu Gao,Yuewen Shao,Dehua Dong,Shu Zhang,Qing Liu,Leilei Xu,Xun Hu +9 more
TL;DR: In this article, Co/Al2O3 catalysts modified with Na, K, Mg or Ca were prepared and the reaction intermediates formed during CO2 methanation were investigated.
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Journal ArticleDOI
The improved reactivity of manganese catalysts by Ag in catalytic oxidation of toluene
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