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Meng Lingqian - One of the best experts on this subject based on the ideXlab platform.

  • Shape selectivity in linear paraffins hydroconversion in 10-membered-ring pore zeolites
    'Elsevier BV', 2021
    Co-Authors: Romero Douglas, Meng Lingqian, Rohling Roderigh, Rigutto Marcello, Hensen, Emiel J.m.
    Abstract:

    Pd/zeolite-catalyzed hydroconversion of n-hexadecane (n-C16) and n-heptane (n-C7) was studied for 10MR (ZSM-5, ZSM-22), 12MR (ZSM-12), and EMM-23 (21MR × 10MR) zeolites. The catalytic activity depended on the Brønsted acidity and the crystalline domain size. n-C16 hydroconversion benefited from short diffusion lengths in ZSM-5 nanosheets compared to bulk ZSM-5. In general, over-cracking is dominant in ZSM-5 with a Cracked Product distribution skewed to C4 Products, to be explained by a snug fit of particular dibranched isomers at zeolite intersections. This effect is less pronounced for the 1D 10MR pores in ZSM-22, which lacks intersections. Although large pores in ZSM-12 offer relatively high activity, those in EMM-23 do not. Based on selectivity patterns, EMM-23 behaves like ZSM-5, probably because of the trilobe shape of its 21MR pores acting as 10MR pores. Only ZSM-12 offers operation in the ideal hydrocracking regime, in the sense of impediments neither by hydrogenation nor by diffusion. Faster intrazeolite diffusion of n-C7 in comparison to n-C16 leads to a higher yield of isomers for the nanostructured zeolites. Overall, the hydroconversion of the smaller alkane is more substantially impacted by variations in the crystalline zeolite domain size

  • Mechanistic Aspects of n-Paraffins Hydrocracking: Influence of Zeolite Morphology and Acidity of Pd(Pt)/ZSM-5 Catalysts: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts
    'Elsevier BV', 2020
    Co-Authors: Meng Lingqian, Vanbutsele G., Pestman Robert, Godin A., Romero Hidalgo, Douglas E., Van Hoof, Arno J.f., Lu Gao, Kimpel Tobias, Chai Jiachun, Martens, Johan A.
    Abstract:

    The influence of zeolite domain size, acidity, and metal type on n-decane and n-nonadecane hydroconversion was investigated for bifunctional Pd(Pt)/ZSM-5 zeolite (bulk, desilicated, thin and thick nanosheets). Decreasing the size of zeolitic domains to a few nanometers results in lower overall activity, higher skeletal isomerization yield, and an imbalance between metal and acid functions. These changes are attributed to a lower pore occupancy of olefinic intermediates due to the substantially larger external surface of nanosheets and higher desorption rates. Well-balanced bifunctional behavior and higher activity of nanosheet ZSM-5 can be achieved by strengthening the metal function or lowering the acidity. The influence on the isomerized and Cracked Product fractions is also discussed. Hydroconversion of n-nonadecane gave low yields of skeletal isomers over all Pd-loaded ZSM-5 catalysts and led to significant over-cracking due to the long intracrystalline residence times of the long hydrocarbon reactant

Martens, Johan A. - One of the best experts on this subject based on the ideXlab platform.

  • Mechanistic Aspects of n-Paraffins Hydrocracking: Influence of Zeolite Morphology and Acidity of Pd(Pt)/ZSM-5 Catalysts: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts
    'Elsevier BV', 2020
    Co-Authors: Meng Lingqian, Vanbutsele G., Pestman Robert, Godin A., Romero Hidalgo, Douglas E., Van Hoof, Arno J.f., Lu Gao, Kimpel Tobias, Chai Jiachun, Martens, Johan A.
    Abstract:

    The influence of zeolite domain size, acidity, and metal type on n-decane and n-nonadecane hydroconversion was investigated for bifunctional Pd(Pt)/ZSM-5 zeolite (bulk, desilicated, thin and thick nanosheets). Decreasing the size of zeolitic domains to a few nanometers results in lower overall activity, higher skeletal isomerization yield, and an imbalance between metal and acid functions. These changes are attributed to a lower pore occupancy of olefinic intermediates due to the substantially larger external surface of nanosheets and higher desorption rates. Well-balanced bifunctional behavior and higher activity of nanosheet ZSM-5 can be achieved by strengthening the metal function or lowering the acidity. The influence on the isomerized and Cracked Product fractions is also discussed. Hydroconversion of n-nonadecane gave low yields of skeletal isomers over all Pd-loaded ZSM-5 catalysts and led to significant over-cracking due to the long intracrystalline residence times of the long hydrocarbon reactant

Godin A. - One of the best experts on this subject based on the ideXlab platform.

  • Mechanistic Aspects of n-Paraffins Hydrocracking: Influence of Zeolite Morphology and Acidity of Pd(Pt)/ZSM-5 Catalysts: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts
    'Elsevier BV', 2020
    Co-Authors: Meng Lingqian, Vanbutsele G., Pestman Robert, Godin A., Romero Hidalgo, Douglas E., Van Hoof, Arno J.f., Lu Gao, Kimpel Tobias, Chai Jiachun, Martens, Johan A.
    Abstract:

    The influence of zeolite domain size, acidity, and metal type on n-decane and n-nonadecane hydroconversion was investigated for bifunctional Pd(Pt)/ZSM-5 zeolite (bulk, desilicated, thin and thick nanosheets). Decreasing the size of zeolitic domains to a few nanometers results in lower overall activity, higher skeletal isomerization yield, and an imbalance between metal and acid functions. These changes are attributed to a lower pore occupancy of olefinic intermediates due to the substantially larger external surface of nanosheets and higher desorption rates. Well-balanced bifunctional behavior and higher activity of nanosheet ZSM-5 can be achieved by strengthening the metal function or lowering the acidity. The influence on the isomerized and Cracked Product fractions is also discussed. Hydroconversion of n-nonadecane gave low yields of skeletal isomers over all Pd-loaded ZSM-5 catalysts and led to significant over-cracking due to the long intracrystalline residence times of the long hydrocarbon reactant

Pestman Robert - One of the best experts on this subject based on the ideXlab platform.

  • Mechanistic Aspects of n-Paraffins Hydrocracking: Influence of Zeolite Morphology and Acidity of Pd(Pt)/ZSM-5 Catalysts: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts
    'Elsevier BV', 2020
    Co-Authors: Meng Lingqian, Vanbutsele G., Pestman Robert, Godin A., Romero Hidalgo, Douglas E., Van Hoof, Arno J.f., Lu Gao, Kimpel Tobias, Chai Jiachun, Martens, Johan A.
    Abstract:

    The influence of zeolite domain size, acidity, and metal type on n-decane and n-nonadecane hydroconversion was investigated for bifunctional Pd(Pt)/ZSM-5 zeolite (bulk, desilicated, thin and thick nanosheets). Decreasing the size of zeolitic domains to a few nanometers results in lower overall activity, higher skeletal isomerization yield, and an imbalance between metal and acid functions. These changes are attributed to a lower pore occupancy of olefinic intermediates due to the substantially larger external surface of nanosheets and higher desorption rates. Well-balanced bifunctional behavior and higher activity of nanosheet ZSM-5 can be achieved by strengthening the metal function or lowering the acidity. The influence on the isomerized and Cracked Product fractions is also discussed. Hydroconversion of n-nonadecane gave low yields of skeletal isomers over all Pd-loaded ZSM-5 catalysts and led to significant over-cracking due to the long intracrystalline residence times of the long hydrocarbon reactant

Chai Jiachun - One of the best experts on this subject based on the ideXlab platform.

  • Mechanistic Aspects of n-Paraffins Hydrocracking: Influence of Zeolite Morphology and Acidity of Pd(Pt)/ZSM-5 Catalysts: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts
    'Elsevier BV', 2020
    Co-Authors: Meng Lingqian, Vanbutsele G., Pestman Robert, Godin A., Romero Hidalgo, Douglas E., Van Hoof, Arno J.f., Lu Gao, Kimpel Tobias, Chai Jiachun, Martens, Johan A.
    Abstract:

    The influence of zeolite domain size, acidity, and metal type on n-decane and n-nonadecane hydroconversion was investigated for bifunctional Pd(Pt)/ZSM-5 zeolite (bulk, desilicated, thin and thick nanosheets). Decreasing the size of zeolitic domains to a few nanometers results in lower overall activity, higher skeletal isomerization yield, and an imbalance between metal and acid functions. These changes are attributed to a lower pore occupancy of olefinic intermediates due to the substantially larger external surface of nanosheets and higher desorption rates. Well-balanced bifunctional behavior and higher activity of nanosheet ZSM-5 can be achieved by strengthening the metal function or lowering the acidity. The influence on the isomerized and Cracked Product fractions is also discussed. Hydroconversion of n-nonadecane gave low yields of skeletal isomers over all Pd-loaded ZSM-5 catalysts and led to significant over-cracking due to the long intracrystalline residence times of the long hydrocarbon reactant