Effects of Carrier on Supported Rare Earth Double Perovskite Oxide Catalysts for Catalytic Combustion of Methane

2012 ◽  
Vol 512-515 ◽  
pp. 1601-1606 ◽  
Author(s):  
Ran Ran Ding ◽  
Jia Nan Hu ◽  
Rui Sheng Hu ◽  
Ying Liu ◽  
Ling Jie Wang
Keyword(s):  
Rare Earth ◽  
Catalytic Combustion ◽  
Supported Catalyst ◽  
Double Perovskite ◽  
Active Phase ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
Perovskite Oxide ◽  
Impregnation Method ◽  
Oxide Support

Supported rare earth double perovskite (La2MnNiO6) oxide catalysts were prepared by incipient wet impregnation method for methane catalytic combustion, and effects of the support (Al2O3, ZrO2 and MgO) were investigated. The loaded catalysts were characterized by means of XRD, TPR, SEM techniques and their catalytic activities were tested by complete methane oxidation. Depending on the different oxide carrier (e.g. Al2O3, MgO and ZrO2), catalysts have different catalytic properties, because the interaction of metal oxide-support will affect both redox property and dispersity of the active phase. The results on catalysts have shown that the dispersion on Al2O3 and MgO supports had an effect to enhance the catalytic performances of the catalysts that had been treated at 1100 oC. The activity of ZrO2 supported catalyst significantly decreases when calcination temperature at is 1100 oC. The dispersity of the active phase and the nature of the oxide carrier played an important role in the catalytic performance.

Catalytic Properties of Ni/CNTs and Ca-Promoted Ni/CNTs for Methanation Reaction of Carbon Dioxide

2014 ◽  
Vol 924 ◽  
pp. 217-226 ◽  
Author(s):  
Xiang Feng Hu ◽  
Wen Yang ◽  
Ning Wang ◽  
Shi Zhong Luo ◽  
Wei Chu
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Catalytic Properties ◽  
Supported Catalyst ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Methanation Reaction ◽  
Ni Species ◽  
Nickel Species

Nickel/carbon nanotubes (Ni/CNTs), Nickel/alumina (Ni/Al2O3), calcium-promoted Ni/CNTs and calcium-promoted Ni/Al2O3 were synthesized by impregnation method. Methanation of carbon dioxide was used as a probe to evaluate their catalytic performance. The features of these Ni-based catalysts were investigated via XRD, H2-TPR, H2-TPD and the N2 adsorptiondesorption isotherms. H2-TPR showed that nickel species on Ni/CNTs was reduced more easily with respect to that on Ni/Al2O3, and addition of Ca can increase the content of easily reducible Ni species for Ni/CNTs. XRD and H2-TPD indicated that addition of Ca promoted dispersion for CNTs-supported catalyst. These finding ultimately enhanced catalytic activity and stability for Ni/CNTs catalyst modified with Ca.

scholarly journals Catalytic Combustion of Dimethyl Disulfide on Bimetallic Supported Catalysts Prepared by the Wet-Impregnation Method

2019 ◽  
Author(s):  
Junan Gao ◽  
Song Gao ◽  
Jun Wei ◽  
Hong Zhao ◽  
Jie Zhang
Keyword(s):  
Synergistic Effect ◽  
Catalytic Combustion ◽  
Supported Catalysts ◽  
Dimethyl Disulfide ◽  
Catalytic Performance ◽  
Sulfur Poisoning ◽  
Impregnation Method ◽  
Promoting Effect ◽  
Wet Impregnation ◽  
Wet Impregnation Method

In this paper, the catalytic combustion of DMDS (dimethyl disulfide, CH3SSCH3) over bimetallic supported catalysts were investigated. It was confirmed that Cu/γ-Al2O3-CeO2 showed best catalytic performance among the five single-metal catalysts. Furthermore, six different metals were separately added into Cu/γ-Al2O3-CeO2 to investigate the promoting effect. The experiments revealed Pt as the most effective promoter and the the best catalytic performance was achieved as the adding amount of 0.3 wt%. The characterization results indicated that high activity and resistance to sulfur poisoning of Cu-Pt/γ-Al2O3-CeO2 could be attributed to the synergistic effect between Cu and Pt.

Dielectric Relaxation of Rare Earth Ordered Double Perovskite Oxide Ba2ErTaO6

2015 ◽  
Vol 45 (1) ◽  
pp. 846-852 ◽  
Author(s):  
Rajesh Mukherjee ◽  
Alo Dutta ◽  
T. P. Sinha
Keyword(s):  
Rare Earth ◽  
Dielectric Relaxation ◽  
Double Perovskite ◽  
Perovskite Oxide

Promoting Effects of Ni for Toluene Catalytic Combustion Over CoNi/TiO2 Oxide Catalysts

2018 ◽  
Vol 16 (6) ◽  
Author(s):  
Hongmei Xie ◽  
Deping Xia ◽  
Guilin Zhou
Keyword(s):  
Catalytic Combustion ◽  
Chemical Properties ◽  
Oxide Catalysts ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Oxygen Species ◽  
Composite Oxide ◽  
Surface Hydroxyl ◽  
Composite Catalysts ◽  
Ni Species

AbstractThe supported CoNi/TiO2composite oxide catalysts were prepared by impregnation method. The physical and chemical properties of the prepared catalysts were studied by XRD, XPS and H2-TPR. The results show that the Co3O4, NiO and NiCo2O4species are formed in the CoNi/TiO2composite oxide catalysts. The interaction between the Co and Ni species can effectively enhance the properties of the CoNi/TiO2oxide catalysts. The introduction of Ni species can effectively enhance the surface hydroxyl oxygen species and adsorbed oxygen species content, and the Co3+species content can be enhanced on the surface of the prepared CoNi/TiO2composite oxide catalysts. The low temperature reducibility and toluene catalytic combustion activity of the CoNi/TiO2composite oxide catalysts can be improved by the Ni species. The toluene catalytic combustion activity of CoNi/TiO2composite catalysts can be obviously affected by the Co/Ni molar ratio. The CoNi/TiO2composite oxide catalyst, which has a Co/Ni molar ratio of 1.0, has the best toluene catalytic combustion activity and wide scope of the concentration of toluene. The toluene catalytic combustion conversion can exceed 99 % at 340 °C. That is to say, the toluene concentration in air can be decreased to 80 ppm from 8000 ppm.

scholarly journals Catalytic Combustion of Dimethyl Disulfide on Bimetallic Supported Catalysts Prepared by the Wet-Impregnation Method

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 994 ◽  
Author(s):  
Junan Gao ◽  
Song Gao ◽  
Jun Wei ◽  
Hong Zhao ◽  
Jie Zhang
Keyword(s):  
Synergistic Effect ◽  
Catalytic Combustion ◽  
Supported Catalysts ◽  
Dimethyl Disulfide ◽  
Catalytic Performance ◽  
Sulfur Poisoning ◽  
Impregnation Method ◽  
Promoting Effect ◽  
Wet Impregnation ◽  
Wet Impregnation Method

In this paper, the catalytic combustion of DMDS (dimethyl disulfide, CH3SSCH3) over bimetallic supported catalysts were investigated. It was confirmed that Cu/γ-Al2O3-CeO2 showed best catalytic performance among the five single-metal catalysts. Furthermore, six different metals were separately added into Cu/γ-Al2O3-CeO2 to investigate the promoting effect. The experiments revealed Pt as the most effective promoter and the best catalytic performance was achieved as the adding amount of 0.3 wt%. The characterization results indicated that high activity and resistance to sulfur poisoning of Cu-Pt/γ-Al2O3-CeO2 could be attributed to the synergistic effect between Cu and Pt.

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