Aromatization of propane over a zeolite catalyst in both a microreactor and pilot plant

Harris, JL; Krisko, N; Wang, X.M.

doi:10.1016/0926-860x(92)80026-9

Cited by 20 publications

(2 citation statements)

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“…These estimates are close to the values earlier reported for propane dehydrogenation on pure acid-form H-ZSM-5 zeolite (apparent activation energy was found to be 70−95 kJ mol −1 , ) and for the overall propane conversion on Ga-modified ZSM-5 (ca. 81 kJ mol −1 ).…”

Section: Resultsmentioning

confidence: 95%

Propane Aromatization on Zn-Modified Zeolite BEA Studied by Solid-State NMR in Situ

et al. 2010

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The conversion of propane (propane-1-13 C and propane-2-13 C) on Zn/H-BEA zeolite at 520-620 K has been studied by 1 H and 13 C (CP) MAS NMR. Propene adsorption complex with zinc sites (π-complex) and σ-allylzinc species as intermediates have been identified in the course of propane conversion to aromatics. The mechanism leading to the formation of methane and ethane, which are constituents of an undesirable route in propane conversion, has been examined by kinetic modeling of the expected reaction network based on in situ 1 H MAS NMR kinetic measurements of the reaction performance. The pathways for propane aromatization and hydrogenolysis have been proposed. Hydrogenolysis of propane has been concluded to occur with the involvement of both Brønsted acid sites and Zn sites.

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Section: Resultsmentioning

confidence: 95%

Propane Aromatization on Zn-Modified Zeolite BEA Studied by Solid-State NMR in Situ

et al. 2010

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“…This estimation is lower compared to monomolecular dehydrogenation of alkanes (140–200 kJ/mol) on acidic zeolites ,− or metal-containing zeolites. − For olefin aromatization step, we estimate the activation energies of 93–145 kJ/mol (Table S3), which is close to the value of 125 kJ/mol related to the formation or cracking of olefin oligomers. Note that other investigations of the oligomerization or aromatization processes on different zeolites gave lower values of the activation energies (50–80 kJ/mol). − Curiously, ethane formation via reaction step k 7 is characterized by relatively small activation barrier (76 kJ/mol) within the frame of Scheme . In this regard, this process does not become evident with the increase of the reaction temperature above 563 K due to the acceleration of hydrogenolysis process.…”

Section: Resultsmentioning

confidence: 97%

Propane Transformation on Zn-Modified Zeolite. Effect of the Nature of Zn Species on Alkane Aromatization and Hydrogenolysis

et al. 2019

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With regard to establishing the effect of the nature of Zn species loaded in a zeolite on the aromatization of propane, the transformation of 13 C-labeled propane (propane-1-13 C and propane-2-13 C) has been monitored by 1 H and 13 C (CP) MAS NMR at 296−623 K for two zeolite samples, containing exclusively either isolated Zn 2+ cations (Zn 2+ /H-BEA zeolite sample) or small (ZnO) n clusters of zinc oxide (ZnO/H-BEA zeolite sample). It has been established that similar intermediates, π-complex of propene and σallylzinc species, are formed at propane transformation to aromatics on both zeolite samples. However, the formation of the identified intermediates and their evolution to final aromatic products have been detected to occur on Zn 2+ /H-BEA at lower temperature (by 100 K) as compared to the same transformation on ZnO/H-BEA zeolite. Analysis of the kinetics of propane transformation by 1 H MAS NMR in situ has shown similar regularities for propane aromatization and hydrogenolysis on the different zeolite samples, but the reactions on Zn 2+ /H-BEA occur 10 times faster than on ZnO/H-BEA. This allows us to conclude on a higher efficiency of Zn 2+ cations compared to ZnO species for propane aromatization on Zn-modified zeolites.

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In Situ Investigations of Catalysts and Catalytic Reaction Mechanisms

Derouane¹,

Hamid²,

Ivanova³

et al. 2000

Combinatorial Catalysis and High Throughput Catalyst Design and Testing

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Aromatization of propane over a zeolite catalyst in both a microreactor and pilot plant

Cited by 20 publications

References 20 publications

Propane Aromatization on Zn-Modified Zeolite BEA Studied by Solid-State NMR in Situ

Propane Aromatization on Zn-Modified Zeolite BEA Studied by Solid-State NMR in Situ

Propane Transformation on Zn-Modified Zeolite. Effect of the Nature of Zn Species on Alkane Aromatization and Hydrogenolysis

In Situ Investigations of Catalysts and Catalytic Reaction Mechanisms

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