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role between the catalyst and the reactants, the pores of the resin are so large that the reactants and the product are able to pass without any resistance. Fig. 2 Study on the internal mass transfer

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. When H 2 O was eliminated from the feed gas mixture, The NO X conversion increased slightly. However, it could not recover to the initial value; only 62% NO X conversion could be reached. This indicated that the resistance to H 2 O of the catalyst was

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Abstract  

La0.8Cu0.2MnO3 and La0.8Sr0.2MnO3 perovskite catalysts were prepared by the co-precipitation method. The resistance of these catalysts to sulfur poisoning was tested via catalytic combustion of toluene. The results show that the perovskite catalysts were poisoned in the presence of SO2. In the presence of dodecyl mercaptan (C12H25SH), La0.8Sr0.2MnO3 exhibits better resistance to sulfur poisoning than La0.8Cu0.2MnO3. It was determined that the SO2 deactivation is due to the formation of CuSO4 on the catalyst surface.

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by the dry catalyst, the catalyst as supplied was used in the kinetic experiments. Elimination of external and internal mass transfer resistance The experiments to obtain kinetics should be carried out under the

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°C, ( d ) 400 °C, ( e ) 450 °C Effect of mass transfer resistances Preliminary experiments were conducted to determine the necessary stirrer speed to ensure the

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point, it is relevant to highlight that k 2 ≫ X . Then Eq. 9 is reduced to Eq. 15 or 16 . It is easy to recognize that the latter depends only on the reaction rate constant, what means that the external resistance for oxygen transport is

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]. Photocatalysis based on the TiO 2 semiconductor is very promising and it has attracted extensive interest for the mineralization of pollutants both in air and water. Titania based photocatalysis has advantages such as strong resistance to chemicals, resistance

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) augmenting surface diffusion resistance for the reactants [ 22 ]. Such chemisorption may be of transient nature as observed in this study. Researchers [ 4 , 12 , 13 ] indicating change in the order of reaction with temperature in their empirical laws may

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CO and VOCs, the high cost and limited availability discourage their extensive applications. Transition metal oxides are alternatives to the noble metal-containing catalysts due to their resistance to halogens, low cost and high catalytic activity and

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as the feed LHSV reduced, which indicated that the reaction resistance was the principal control step of the reaction and the dynamics was the apparent kinetics. Conclusions Gas–solid phase N -alkylation of

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