Kinetic modeling of propane aromatization reaction over HZSM-5 and GaHZSM-5

Lukyanov, Dmitry B.; Gnep, N.S.; Guisnet, M.

doi:10.1021/ie00041a012

Cited by 78 publications

(79 citation statements)

References 23 publications

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“…Although lower alkanes and alkenes aromatization, such as ethene, propane and propene, have been widely studied over HZSM-5 [3][4][5] and metal-based ZSM-5 type zeolites viz. Zn/HZSM-5 [6], GaMFI [7,8] and H-GaAlMFI [9,10], studies covering the influence of reaction temperature and space velocity on the product distribution in the conversion of larger olefins over HZSM-5 zeolite are scarce.…”

Section: Introductionmentioning

confidence: 99%

Conversion of n-Octene over Nanoscale HZSM-5 Zeolite

et al. 2008

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Transformation of n-octene has been investigated over nanoscale HZSM-5 at different reaction temperature and contact time. The results show that the main reaction was isomerization of n-octene over 200°C. Hydrogen transfer reaction also occurred at 200°C, but the products were alkanes and cycloolefins instead of aromatics. The aromatization was promoted by high temperature. The maximum selectivity of i-paraffins occurred between 300 and 350°C. Propene, butene and pentene were the primary cracking products. These olefins were oligomerized and cracked to produce a wide distribution of olefins with different carbon atoms. These intermediates then were quickly transformed into aromatics and alkanes by hydrogen transfer over acid sites at high reaction temperature. Propane and butane can be transformed into methane and ethane at long contact time above 400°C.

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Section: Introductionmentioning

confidence: 99%

Conversion of n-Octene over Nanoscale HZSM-5 Zeolite

et al. 2008

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“…From the enormous studies in aromatization of hydrocarbons, the reaction mechanism of aromatization of alkanes is summarized as follows. An initial reaction was alkene formation through protolytic cracking of a C-H and/or C-C bond and hydride transfer [36][37][38][39]. Then, subsequent alkene oligomerization and cracking, and finally main aromatics such as benzene, toluene and xylenes (BTX) were formed through a sequence of cyclization and hydride transfer steps including diene formation from hydride transfer of alkenes, cyclization of dienes and hydride transfer of cyclodienes [36,40,41].…”

Section: Effect Of Synthesis Conditions To Para-selectivitymentioning

confidence: 99%

para-Selectivity of silicalite-1 coated MFI type galloaluminosilicate in aromatization of light alkanes

et al. 2015

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MFI type galloaluminosilicates (GaAlMFI) were coated with inert silicalite-1 layers. The silicalite-1 coating could improve the para-selectivity for xylene production in aromatization of propane. In the silicalite-1 coating step, low alkali concentration in the synthesis solution enhanced para-selectivity. A proton-exchange procedure also had an impact on the para-selectivity. Significant decrease of para-selectivity was observed over the silicalite-1 coated GaAlMFI with repeated proton-exchange. From the 71 Ga and 27 Al MAS NMR measurements, demetalation occurred during the proton-exchange process, and those metal species is likely to become catalytically active sites without para-selectivity. From the aromatization of propane and n-butane, para-selectivity in n-butane aromatization was found to be higher than that in propane aromatization. From the product distribution, naphthalene and its derivatives were easier to be produced in propane aromatization compared to n-butane aromatization. The formation of naphthalene and its derivatives may relate to decrease in the para-selectivity in propane aromatization.

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“…1) are complex heterogeneous reactions. With H-ZSM-5 catalysts, the first stage of alkane transformation proceeds via two routes (Gnep et al, 1987;Haag and Dessau, 1984;Kitagawa et al, 1986;Krannila et al, 1992;Lukyanov et al, 1995): protolytic cracking (PC) route (cracking of C-C and C-H bonds in the alkane molecules) and hydrogen transfer (HT) route that involves the reaction between the alkane with the product alkenes adsorbed on the acid sites of the zeolite. The second stage, alkene interconversion, includes alkene isomerization, oligomerization and cracking steps (Garwood, 1983).…”

Section: Alkene Aromatizationmentioning

confidence: 99%

“…To obtain quantitative information on the rates of the reaction steps briefly outlined above, Lukyanov et al (1994aLukyanov et al ( , 1995 developed a detailed kinetic model that was used for the quantitative analysis of the kinetic data on aromatization of ethene, propene and propane over fresh (non-deactivated) H-ZSM-5 and Ga,H-ZSM-5 zeolites (Si/Al = 40). A microkinetic approach, which is considered comprehensively by Dumesic et al (1993) and Cortright and Dumesic (2001), was used in the construction of this model that described quantitatively transformation of 42 components in 338 reaction and adsorption steps.…”

Section: Aromatics + H 2 Mementioning

confidence: 99%