Non-oxidative aromatization of C1 to C3 hydrocarbons over Pd-promoted Ga/HZSM-5 catalyst under mild conditions

Shen, Xiao Chun; Liu, Hui; Hu, Kai; Zheng, Xiao

doi:10.1016/j.cclet.2007.01.044

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…A hydrogen-transfer mechanism between methane and alkene was proposed to account for the observed decrease in ΔG r for conversion of methane to benzene. Similar results were reported subsequently for Mo- [199−202], Zn- [198,203,204] and Ga- [205] based zeolite catalysts. Anunziata et al [206−212] reported the enhancement in both methane conversion and aromatics selectivity upon the addition of ethane (C 2 ), propane (C 3 ), LPG or light gasoline (n-C 5 , n-C 6 , and n-C 7 ) to methane feed over Zn-containing zeolite catalysts.…”

Section: Addition Of Co-reactantssupporting

confidence: 89%

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Guo

Zhao

et al. 2013

Journal of Energy Chemistry

229

183

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Section: Addition Of Co-reactantssupporting

confidence: 89%

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Guo

Zhao

et al. 2013

Journal of Energy Chemistry

229

183

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“…The development of aromatization techniques has been rapid since the synthesis of ZSM-5 zeolite. Previous works revealed that C 2 -C 12 hydrocarbon can be translated into light aromatics directly, but hydrocarbons composed of different carbon numbers have different aromatization performance (Liu and Yi, 2001;Shen et al, 2007;Zhou et al, 2008).…”

Section: Introductionmentioning

confidence: 97%

The Aromatization of Different FCC Naphtha Fractions over a P-Zn/HZSM-5 Catalyst

Zhao

Cao

Tang

et al. 2011

Petroleum Science and Technology

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The aromatization reaction performance of P-Zn/HZSM-5 catalyst was investigated on a fixed bed reactor using five fluid catalytic cracked (FCC) gasoline fractions (<100 ı C, 50 ı C-100 ı C, <120 ı C, 75 ı C-120 ı C, and full fraction) as feedstock, and the effect of feedstock on aromatization is discussed. The results showed that the activity and stability of P-Zn/HZSM-5 catalyst for the aromatization of the 50 ı C-100 ı C fraction were high in definite reaction conditions. After 16 hr, the content of olefin and aromatics in liquid product were 5.23 and 79.9%, respectively. The liquid product of low olefin and high aromatics was obtained. The distribution of benzene, toluene, and xylene in liquid product of 50 ı C-100 ı C fraction was investigated during aromatization, and the result showed that the toluene content was maximum among the three aromatics contents, the benzene content was minimum at the beginning of the reaction, xylene content became maximum, and benzene was still minimum after reacting for 20 hr. The content of C C 9 aromatics increased at the first stage of the reaction and then decreased with the increasing reaction time.

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“…36 Another suggested way to increase the catalytic activity is the addition of Pd, which allows a better conversion under mild process conditions. 36,37 Several mechanisms have been proposed to explain aromatic formation, 38−41 and although several studies have been dedicated to this reaction, investigation on the mechanism of the propane aromatization reaction is still an open challenge. Anyway, the first step of the reaction is the conversion of propane in ethylene and methane by protolytic C−C cracking or in propylene by a dehydrogenation reaction.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, by increasing the reaction temperature, the selectivity toward aromatics decreases and a higher production of cracking compounds (methane, ethane) is observed. , Also, the catalyst porosity may be relevant in selectivity control, as mesoporous Ga-MFI showed an increased selectivity, and the presence of induced intracrystalline mesoporosity was found to be also a relevant parameter to shorten the contact time improving conversion and BTX selectivity with respect to the parental zeolites . Another suggested way to increase the catalytic activity is the addition of Pd, which allows a better conversion under mild process conditions. , …”

Section: Introductionmentioning

confidence: 99%

Simplified Kinetic Modeling of Propane Aromatization over Ga-ZSM-5 Zeolites: Comparison with Experimental Data

Migliori

Aloise

Catizzone

et al. 2017

Ind. Eng. Chem. Res.

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This paper presents new results about experimental tests and kinetic modeling of propane aromatization on a Ga-ZSM-5 zeolite. The presence of gallium as a doping metal promotes dehydrogenation reactions, limiting the formation of side products (cracking fuel gas) and increasing the yield to aromatics. In this study, kinetic tests of propane aromatization at different values of reaction temperature (500, 525, and 550 °C) and contact time (0.07, 0.14, and 0.28 h) are performed in a multi-tubular reactor, aiming at investigating the complex reaction scheme of propane aromatization at a constant pressure (3 bar). Based on the obtained experimental data, a kinetic analysis is performed considering cracking products (methane and ethane/ethylene) and main aromatic compounds (benzene, toluene, xylenes, and ethylbenzene). This simplified approach is found to be a robust tool to predict products distribution when experimental data points are not enough to perform a reliable model parameters estimation. In the specific case, the adopted macroscopic kinetic model nicely predicts the catalyst behavior in terms of both propane conversion and products distribution. The kinetic parameters evaluation for the synthesized Ga-ZSM-5 sample also suggests a reaction temperature of 525 °C as an optimum value to favor the aromatization rather than the cracking of propane.

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Non-oxidative aromatization of C1 to C3 hydrocarbons over Pd-promoted Ga/HZSM-5 catalyst under mild conditions

Cited by 12 publications

References 12 publications

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

The Aromatization of Different FCC Naphtha Fractions over a P-Zn/HZSM-5 Catalyst

Simplified Kinetic Modeling of Propane Aromatization over Ga-ZSM-5 Zeolites: Comparison with Experimental Data

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