Benzene Alkylation with Propane over Pt-Modified MFI Zeolites

Smirnov, A. P.; Mazin, E.V.; Yuschenko, V.V.; Knyazeva, E. E.; Нестеренко, С. Н.; Ivanova, I. I.; Galperin, L.B.; Jensen, R. H.; Bradley, Steven

doi:10.1006/jcat.2000.2910

Cited by 39 publications

(72 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the 1960s, supported catalysts such as BF 3 /Al 2 O 3 and supported phosphoric acid (SPA) were proposed to replace the AlCl 3 -based catalysts [6]. However, the processes catalysed by either SPA or AlCl 3 -based FriedelCraft catalysts, suffer from serious environmental and corrosion problems [7]. The disposal of unavoidable byproducts formed in stoichiometric reactions, such as oxidation, has raised serious environmental problems [8].…”

mentioning

confidence: 99%

Alkylation of benzene with ethanol over modified HZSM-5 zeolite catalysts

Emana

Chand

2015

Appl Petrochem Res

View full text Add to dashboard Cite

Alkylation of benzene with ethanol was analysed using unmodified as well as modified shape selective HZSM-5 (Si/Al = 31) zeolite catalysts. The reaction was carried out in a continuous fixed bed flow reactor in the temperature range of 300-500°C at atmospheric pressure to investigate the activity of various catalysts for the selectivity and yield of ethylbenzene (the desired product). The alkylation of benzene with ethanol (2:1 by volume) produces ethyl benzene as primary product and others like diethylbenzene, triethylbenzene and xylene mixtures as secondary products. The modification of HZSM-5 was done by impregnation using boron and magnesium. The modification caused changes in the surface area, acidity and pore volume of zeolite sample. The physiochemical properties of catalysts were characterised by XRD, TEM, BET, TGA, FTIR, NH 3 -TPD and SEM. The feed and products were analysed by gas chromatography. The conversion of benzene was found to be better in bi metallic (B and Mg) modified HZSM-5 followed by unmodified HZSM-5. The modified catalysts gave better selectivity (72.8 %) and yield (38.1 %) of ethylbenzene.

show abstract

mentioning

confidence: 99%

Alkylation of benzene with ethanol over modified HZSM-5 zeolite catalysts

Emana

Chand

2015

Appl Petrochem Res

View full text Add to dashboard Cite

show abstract

“…In contrast, the alkylation of benzene with propane has proved to be more difficult, giving only 32% iPrPh selectivity at 6.6% conversion using Pt/HZSM-5 [13]. The main product was nPrPh (50% selectivity) rather than iPrPh [13], which would be the favourable product from the carbenium ion mechanism. This may be due to the shape selectivity control imposed by the zeolite microporous environment [18].…”

Section: Introductionmentioning

confidence: 99%

“…The alkylation of benzene with ethene and propene is used to manufacture ethylbenzene (EtPh) and isopropylbenzene (iPrPh), which are the intermediates in styrene and phenol production, respectively [1]. It has been demonstrated that ethene and propene can be replaced by abundant and inexpensive alkanes, ethane and propane, which would lead to the more cost-effective and environmentally friendly production of these commodity chemicals [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The alkylation of benzene with light alkanes occurs in the gas phase in the presence of solid bifunctional metal-acid catalysts, which operate via a pathway, shown in Scheme 1, including the dehydrogenation of alkane on metal sites to form alkene and H 2 (step 1) followed by the alkylation of benzene with the alkene on acid sites (step 2).…”

Section: Introductionmentioning

confidence: 99%

“…The alkylation of benzene with light alkanes occurs in the gas phase in the presence of solid bifunctional metal-acid catalysts, which operate via a pathway, shown in Scheme 1, including the dehydrogenation of alkane on metal sites to form alkene and H2 (step 1) followed by the alkylation of benzene with the alkene on acid sites (step 2). Pt-zeolite bifunctional catalysts have been shown to be the most active for benzene alkylation with ethane [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The best results have been attained using Pt-modified HZSM-5 zeolite to obtain >90% selectivity to EtPh at an almost equilibrium benzene conversion of 12% [6].…”

Section: Introductionmentioning

confidence: 99%

“…The best results have been attained using Pt-modified HZSM-5 zeolite to obtain >90% selectivity to EtPh at an almost equilibrium benzene conversion of 12% [6]. In contrast, the alkylation of benzene with propane has proved to be more difficult, giving only 32% iPrPh selectivity at 6.6% conversion using Pt/HZSM-5 [13]. The main product was nPrPh (50% selectivity) rather than iPrPh [13], which would be the favourable product from the carbenium ion mechanism.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Selective Alkylation of Benzene by Propane over Bifunctional Pd-Acid Catalysts

et al. 2017

View full text Add to dashboard Cite

Abstract:The alkylation of benzene by propane to yield isopropylbenzene (iPrPh) was studied using bifunctional Pd-acid catalysts, such as Pd-heteropoly acid and Pd-zeolite, in a fixed bed reactor at 300 • C and 1 bar pressure. Keggin-type tungstosilicic acid H 4 SiW 12 O 40 (HSiW) and zeolite HZSM-5 were used as the acid components in these catalysts. The reaction occurred most efficiently over 2%Pd/25%HSiW/SiO 2 , giving iPrPh with up to 88% selectivity. The Pd-HSiW catalyst was more selective than the Pd-HZSM-5; the latter gave only 11-18% iPrPh selectivity. The reaction proceeded via a bifunctional mechanism including the dehydrogenation of propane to form propene on Pd sites, followed by the alkylation of benzene with the propene on acid sites. The effect of Pd loading in Pd-HSiW and Pd-HZSM-5 catalysts indicated that the first step reached quasi-equilibrium at 1.5-2% Pd loading and the second step became rate limiting. The addition of gold to Pd-HSiW enhanced the activity of this catalyst, although the Au-HSiW without Pd was inert.

show abstract

Non‐Oxidative Activation of Alkanes

Traa

2008

Handbook of Heterogeneous Catalysis

View full text Add to dashboard Cite

The sections in this article are Introduction Thermodynamic Aspects Activation of Methane Catalytic Decomposition of Methane to Hydrogen and Carbon Conversion of Methane to Ethane and other Aliphatics Aromatization of Methane The Catalyst The Carbonaceous Deposits and Mechanistic Considerations Influence of Co‐Reactants Co‐Conversion of Methane with Alkenes Alkylation of Aromatics with Alkanes Propane as Alkylating Agent Ethane as Alkylating Agent Methane as Alkylating Agent? Other Reactions of Light Alkanes Conclusions Acknowledgments

show abstract

Benzene Alkylation with Propane over Pt-Modified MFI Zeolites

Cited by 39 publications

References 21 publications

Alkylation of benzene with ethanol over modified HZSM-5 zeolite catalysts

Alkylation of benzene with ethanol over modified HZSM-5 zeolite catalysts

Selective Alkylation of Benzene by Propane over Bifunctional Pd-Acid Catalysts

Non‐Oxidative Activation of Alkanes

Contact Info

Product

Resources

About