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Daniel E Resasco – One of the best experts on this subject based on the ideXlab platform.

  • regeneration and oxidation reduction cycles of vapor phase and incipient wetness impregnation pt kl catalysts
    Studies in Surface Science and Catalysis, 2000
    Co-Authors: Firoz Ghadiali, Gary Jacobs, Adriana Pisanu, Armando Borgna, Walter E Alvarez, Daniel E Resasco

    Abstract:

    The regeneration of three different Pt/KL catalysts has been studied after the n-hexane Aromatization reaction in the presence of sulfur. It has been found that regeneration in air of poisoned catalysts does not result in recovery of the Aromatization activity. After this regeneration, growth of Pt particles outside the channels of the zeolite is observed. By contrast, regeneration with addition of a halo-alcohol results in Pt redispersion and significant recovery of Aromatization activity. The preparation method employed and the presence of Tm as a promoter plays an important role in the efficiency of the regeneration procedure.

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Yueqin Song – One of the best experts on this subject based on the ideXlab platform.

  • an effective method to enhance the stability on stream of butene Aromatization post treatment of zsm 5 by alkali solution of sodium hydroxide
    Applied Catalysis A-general, 2006
    Co-Authors: Yueqin Song, Yi Song, Qingxia Wang, Longya Xu

    Abstract:

    The catalytic stability of ZSM-5 zeolite in butene Aromatization was improved by the treatment of ZSM-5 zeolite with sodium hydroxide solution of appropriate concentration. By characterizing pore structures, the acidity of the catalyst and the coke amount, we found that alkali-treatment of ZSM-5 led to a formation of new mesopores resulting from a preferential removal of silicon species, while the intrinsic micropores remained unchanged. As for the acidity, the amount and properties of acid sites exhibited a slight change on the alkali-treated ZSM-5 zeolites. In addition, the alkali-treatment to ZSM-5 zeolite led to only a little reduction in the amount of coke during the butene Aromatization. But a portion of coke was deposited in the newly created mesopores because of the alkali-treatment and the formation of coke in the micropores was found to be reduced. These changes can suppress the channel blockage of ZSM-5 zeolite by the coke deposits during butene Aromatization. The variation of the coking location was the main reason for the favorable enhancement in the reaction stability during butene Aromatization.

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Longya Xu – One of the best experts on this subject based on the ideXlab platform.

  • an effective method to enhance the stability on stream of butene Aromatization post treatment of zsm 5 by alkali solution of sodium hydroxide
    Applied Catalysis A-general, 2006
    Co-Authors: Yueqin Song, Yi Song, Qingxia Wang, Longya Xu

    Abstract:

    The catalytic stability of ZSM-5 zeolite in butene Aromatization was improved by the treatment of ZSM-5 zeolite with sodium hydroxide solution of appropriate concentration. By characterizing pore structures, the acidity of the catalyst and the coke amount, we found that alkali-treatment of ZSM-5 led to a formation of new mesopores resulting from a preferential removal of silicon species, while the intrinsic micropores remained unchanged. As for the acidity, the amount and properties of acid sites exhibited a slight change on the alkali-treated ZSM-5 zeolites. In addition, the alkali-treatment to ZSM-5 zeolite led to only a little reduction in the amount of coke during the butene Aromatization. But a portion of coke was deposited in the newly created mesopores because of the alkali-treatment and the formation of coke in the micropores was found to be reduced. These changes can suppress the channel blockage of ZSM-5 zeolite by the coke deposits during butene Aromatization. The variation of the coking location was the main reason for the favorable enhancement in the reaction stability during butene Aromatization.

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