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TPD of ammonia from H-ZSM-5 zeolites deactivated during coupled methanol hydrocarbon cracking (CMHC)

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Abstract

The deactivation of H-ZSM-5 zeolite samples during coupled methanol/hydrocarbon cracking (CMHC) with n-butane as feed has been investigated in two different reaction modes (with intermediate regeneration and without regeneration). TPDA was used to characterize strong Brönsted acidity of fresh, regenerated and steamed H-ZSM-5 zeolite. The prevention of dealumination by blocking the acid centers with carbonaceous products could be proved, but the conversion rate of n-butane and the olefin selectivity declined drastically with increasing coking rate.

Abstract

Дезактивадию образцов цеолитов H-ZSM-5 в ходе связан-ного крекинга метанола/углеводорода с н-бутаном на питании исследобали в двух различных модификациях реак-ции (с непосредственным регенерированием и без реге-нериоования). ТПДА была исследована для характеристики сильной Брёнстздной кислотности свежих, регенерирован-ных и отпаренных цеолитов H-ZSM-5. Хотя предотвращение деалюми нирования блокированием кислых центров углерод-ными продуктами может быть улучшено, однако, с увели-чением скорости крекинга скорость конверсии н-бутана и селективность к олефину круто уменьшаются.

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Authors and Affiliations

  1. Central Institute of Organic Chemistry, Berlin-Adlershof, Rudower Chaussee 5, O-1199, Berlin, Germany

    S. Peter

  2. Central Institute of Physical Chemistry, Rudower Chaussee 5, O-1199, Berlin, Germany

    A. Martin & B. Parlitz

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  1. A. Martin
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  2. B. Parlitz
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  3. S. Peter
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Martin, A., Parlitz, B. & Peter, S. TPD of ammonia from H-ZSM-5 zeolites deactivated during coupled methanol hydrocarbon cracking (CMHC). React Kinet Catal Lett 46, 11–16 (1992). https://doi.org/10.1007/BF02096671

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  • DOI: https://doi.org/10.1007/BF02096671

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