Roles of Carrier Gases on Deactivation and Coking in Zeolite Beta during Cumene Disproportionation

Chen, Wenhua; Pradhan, Ajit; Jong, Sung-Jeng; Lee, Ting-Yueh; Wang, Ikai; Tsai, Tseng-Chang; Liu, Shang-Bin

doi:10.1006/jcat.1996.0345

Cited by 30 publications

(14 citation statements)

References 33 publications

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“…The detailed experimental setup and procedures can be found elsewhere [23,24]. To facilitate variabletemperature (VT) 129 Xe NMR experiments, a home-design NMR sample cell (Pyrex; 7 mm i.d.)…”

Section: Sample Pretreatment and Adsorption Studiesmentioning

confidence: 99%

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Structure and acidity of Mo/H-MCM-22 catalysts studied by NMR spectroscopy

et al. 2004

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Section: Sample Pretreatment and Adsorption Studiesmentioning

confidence: 99%

“…4. In general, the observed chemical shift in the low xenon loading (Henry's law) regime can be expressed by the following equation [7][8][9][23][24][25][26][27]: Xe loading) to the chemical shift axis. On the other hand, the last term proportional to r is the characteristic of XeXe interactions.…”

Section: Xenon Adsorption and 129 Xe Nmrmentioning

confidence: 99%

Structure and acidity of Mo/H-MCM-22 catalysts studied by NMR spectroscopy

et al. 2004

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“…The carrier gas serves as a diluting medium to improve the conductivity and diffusivity of the reactant and product molecules through zeolite intracrystalline pores or voids. The reactants, reaction intermediates and products, if retained in the interior of zeolite channels or pores, can affect the size/ shape selectivity of the catalyst and hence are equally credible to increase coke formation [9][10][11][12][13][14]. Hence, the reaction chemistry of hydrocarbons in zeolite catalysts cannot be understood by monitoring the products alone.…”

Section: Introductionmentioning

confidence: 99%

“…The influences of carrier gases on catalytic activity and stability of zeolites in monoalkylbenzene disproportionation reaction have been the focus of several studies [9,[15][16][17][18] in which hydrogen (H 2 ) and nitrogen (N 2 ) were the two most popular candidates for the study of CGE (carrier gas effect). For example, the effect of H 2 carrier gas on catalytic activity has been reported by Gnep and Guisnet [15] for toluene conversion on mordenite zeolite and for ethylbenzene disproportionation on 0.2 wt% Pt/LaNaX zeolite.…”

Section: Introductionmentioning

confidence: 99%

“…The authors disclosed that, under elevated pressures ([0.1 MPa), the degree of conversion during toluene disproportionation on H-ZSM-5 follows the trend H 2 \ He \ N 2 \ Ar. Chen et al [9] reported the influence of carrier gases (N 2 , H 2 , He, CO 2 ) on the catalytic activity, stability, and coke formation in zeolite beta during cumene disproportionation reaction. The authors disclosed that the degree of conversion during cumene disproportionation on zeolite beta follows the trend N 2 [ H 2 [ He [ CO 2 , whereas order was reverse for catalytic stability.…”

Section: Introductionmentioning

confidence: 99%

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Effect of N2 and O2 on selective disproportionation of xylene mixed ethylbenzene over highly active silylated HZSM-5

Nandiwale

Bokade

2013

Appl Petrochem Res

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The influence of carrier gases such as nitrogen and air (78 % N 2 and 21 % O 2 ) on catalytic activity and its stability etc., over modified H-ZSM-5 (pore size regulated by silylation) for the selective formation of Para-diethylbenzene (p-DEB) by xylene mixed ethylbenzene (EB) disproportionation is discussed. The comparison of plane and modified HZSM-5 catalysts using different carrier gases viz., nitrogen and air on pure EB and xylene mixed EB feeds are presented. The disproportionation reaction with xylene mixed EB feed in the presence of air over HZSM-5TS (8 % silica deposited) is observed to be more active and selective as far as p-DEB formation is concerned. Reaction kinetics of EB disproportionation with first-order power law model at different temperatures and W/F (weight of the catalyst/reactant feed rate), with pure EB and xylene mixed EB feed are also discussed. The reaction rate constants are within 0.0668-0.0969 dm 3 /g h and the activation energy of the reaction is calculated to be 30.16 kJ/mol. The catalyst stability (100 h) in the presence of carrier gas is also studied in detail.

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Chemo‐ and Regioselective Synthesis of Arylated γ‐Valerolactones from Bio‐based Levulinic Acid with Aromatics Using H‐β Zeolite Catalyst

Gundekari

Srinivasan

2019

ChemCatChem

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Catalytic coupling of biomass-based molecules to value-added chemical intermediates is an interesting area in biomass research. Arylated γ-valerolactones (Agvls), promising pharmaceutical intermediates that have significant biological activity, are primarily synthesized currently through petro-route. In this paper, we report successful biomass-based synthesis of Agvls using levulinic acid (LA) and oxygen or sulphur-substituted aromatics over H-β zeolite as catalyst under solvent-free conditions. Under optimized condition, LA and anisole render 90 % conversion of former with 82 % yield of para-substituted γlactone. CÀ C bond formation followed by intra-molecular esterification is witnessed in the course of the reaction, which is highly chemo-and regioselective. Though catalyst deactivated while reuse due to deposition of organic carbon moieties as deduced from several physicochemical techniques, it could be regenerated by simple calcination.[a] Dr.

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Roles of Carrier Gases on Deactivation and Coking in Zeolite Beta during Cumene Disproportionation

Cited by 30 publications

References 33 publications

Structure and acidity of Mo/H-MCM-22 catalysts studied by NMR spectroscopy

Structure and acidity of Mo/H-MCM-22 catalysts studied by NMR spectroscopy

Effect of N2 and O2 on selective disproportionation of xylene mixed ethylbenzene over highly active silylated HZSM-5

Chemo‐ and Regioselective Synthesis of Arylated γ‐Valerolactones from Bio‐based Levulinic Acid with Aromatics Using H‐β Zeolite Catalyst

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