The Effect of the Preparation Conditions of Al2O3 Support to Catalysts for Diesel Particulate Removal from Exhaust Gases

2012 ◽  
Vol 557-559 ◽  
pp. 46-49
Author(s):  
Shu Hua Li ◽  
Hong Liang ◽  
Yao Chen ◽  
Zhi Li Liu
Keyword(s):  
Catalytic Activity ◽  
Calcination Temperature ◽  
Ph Value ◽  
Diesel Particulate Matter ◽  
Great Contribution ◽  
Active Components ◽  
Immersion Method ◽  
Diesel Particulate ◽  
Preparation Conditions ◽  
Particulate Removal

A study has been conducted on the preparation conditions of Al2O3 for the catalysts for diesel particulate matter. The results show that the preparation conditions of Al2O3 support had great contribution to performance of Sn-Cu-K-V/Zr02-Al2O3 catalyst. The conditions of precipitant, pH value and calcination temperature were investigated. The experiment results show that the suitable precipitant was Na2CO3, the pH value of the solution was 9 and calcination temperature was 1000°C. The catalyst which active components were loaded on the modified support by immersion method showed better catalytic activity.

The Effects of Different Preparation Conditions of IR Catalyst on the Simultaneous Removal of Soot and NOx in the Presence of Rich Oxygen and H2O as Well as SO2

2012 ◽  
Vol 428 ◽  
pp. 61-64 ◽  
Author(s):  
Ting Kun Gu ◽  
Rong Shu Zhu ◽  
Feng Ouyang
Keyword(s):  
Catalytic Activity ◽  
Calcination Temperature ◽  
Supported Catalysts ◽  
Catalytic Performance ◽  
Simultaneous Removal ◽  
Impregnation Method ◽  
Support Material ◽  
Calcination Time ◽  
Preparation Conditions ◽  
Calcination Atmosphere

A series of Ir-supported catalysts were prepared by incipient impregnation method. The activity of Ir catalyst for the simultaneous removal of soot and NOx in the presence of rich-oxygen and H2O as well as SO2 has been studied, and the effects of calcination temperature, calcination time, calcination atmosphere, loading, carrier and precursor on its catalytic performance has also been investigated. Ir catalyst exhibits a high activity. With the calcination temperature increasing, Ir catalytic activity increases firstly and then decreases, and the optimal calcination temperature is 900°C. With the calcination time prolonged, Ir catalytic activity also increases firstly and then decreases, and the optimal calcination time is 3h. The optimal calcination atmosphere is 1.5vol.% H2/N2. Support material and precursor have a little effect on the catalytic activity, and the order is Ir/TiO2 > Ir/ZrO2 > Ir/SiO2 > Ir/Al2O3 > Ir/ZSM-5 and IrCl (CO)[P(C6H5)3]2/ZrO2 > H2IrCl6·6H2O/ZrO2 > IrCl4·4H2O/ZrO2.

scholarly journals Influences of Different Preparation Conditions on Catalytic Activity of Ag2O-Co3O4/γ-Al2O3for Hydrogenation of Coal Pyrolysis

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Lei Zhang ◽  
Sha Xiang-ling ◽  
Lei Zhang ◽  
Wang Rui ◽  
Zhang Lixin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Calcination Temperature ◽  
Catalyst Activity ◽  
Preparation Condition ◽  
Impregnation Method ◽  
Coal Pyrolysis ◽  
Calcination Time ◽  
Calcination Temperatures ◽  
Preparation Conditions ◽  
Cobalt Loading

A series of catalysts of Ag2O-Co3O4/γ-Al2O3was prepared by equivalent volume impregnation method. The effects of the metal loading, calcination time, and calcination temperatures of Ag and Co, respectively, on the catalytic activity were investigated. The optimum preparing condition of Ag2O-Co3O4/γ-Al2O3was decided, and then the influence of different preparation conditions on catalytic activity of Ag2O-Co3O4/γ-Al2O3was analyzed. The results showed the following: (1) at the same preparation condition, when silver loading was 8%, the Ag2O-Co3O4/γ-Al2O3showed higher catalyst activity, (2) the catalyst activity had obviously improved when the cobalt loading was 8%, while it was weaker at loadings 5% and 10%, (3) the catalyst activity was influenced by different calcination temperatures of silver, but the influences were not marked, (4) the catalyst activity can be influenced by calcination time of silver, (5) different calcination times of cobalt can also influence the catalyst activity of Ag2O-Co3O4/γ-Al2O3, and (6) the best preparation conditions of the Ag2O-Co3O4/γ-Al2O3were silver loading of 8%, calcination temperature of silver of 450°C, and calcinations time of silver of 4 h, while at the same time the cobalt loading was 8%, the calcination temperature of cobalt was 450°C, and calcination time of cobalt was 4 h.

Hydrogen peroxide decomposition on a two-component CuO-Cr2O3 catalyst

1988 ◽  
Vol 53 (8) ◽  
pp. 1636-1646 ◽  
Author(s):  
Viliam Múčka ◽  
Kamil Lang
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Extreme Values ◽  
Catalytic Properties ◽  
Active Components ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Peroxide Decomposition ◽  
Two Component ◽  
Catalytically Active

Some physical and catalytic properties of the two-component copper(II)oxide-chromium(III)oxide catalyst with different content of both components were studied using the decomposition of the aqueous solution of hydrogen peroxide as a testing reaction. It has been found that along to both basic components, the system under study contains also the spinel structure CuCr2O4, chromate washable by water and hexavalent ions of chromium unwashable by water. The soluble chromate is catalytically active. During the first period of the reaction the equilibrium is being established in both homogeneous and heterogeneous catalytic systems. The catalytic activity as well as the specific surface area of the washed solid is a non-monotonous function of its composition. It seems highly probable that the extreme values of both these quantities are not connected with the detected admixtures in the catalytic system. The system under study is very insensitive with regard to the applied doses of gamma radiation. Its catalytic properties are changed rather significantly after the thermal treatment and particularly after the partial reduction to low degree by hydrogen. The observed changes of the catalytic activity of the system under study are very probably in connection with the changes of the valence state of the catalytically active components of the catalyst.

Scrubbing effect on diesel particulate matter from transesterified waste oils blends

Fuel ◽  
2006 ◽  
Vol 85 (7-8) ◽  
pp. 923-928 ◽  
Author(s):  
A. Durán ◽  
J.M. Monteagudo ◽  
O. Armas ◽  
J.J. Hernández
Keyword(s):  
Particulate Matter ◽  
Diesel Particulate Matter ◽  
Diesel Particulate ◽  
Waste Oils
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