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Chemical Papers

, Volume 71, Issue 1, pp 137–148 | Cite as

A comparative study of catalytic performance of rare earth metal-modified beta zeolites for synthesis of cymene

  • Ruchika Thakur
  • Raj K. Gupta
  • Sanghamitra Barman
Original Paper
  • 86 Downloads

Abstract

A series of zeolite (LaB, CeB, and PrB) containing rare earth metals lanthanum (La), cerium (Ce), and praseodymium (Pr) were used for transalkylation reaction. The modified beta zeolites were characterized by EDS, XRD, BET, FTIR, and TPD. The surface area and acidities of the zeolite samples modified with various rare earth metals are considerably different. The effect of various process parameters like metal loading (2–10 wt%), catalyst loading (1.44–8.63 w/w%), temperature (448–573 K), reactant ratio 1–15, and space time (3.2–9.29 kg h/kmol) on the conversion of reactant and selectivity of product was studied. Catalytic performance of praseodymium-modified beta zeolite shows highest cumene conversion (86.4 wt%) and cymene selectivity (65.7 wt%) compared to other zeolites. The maximum cumene conversion and cymene selectivity were obtained at 523 K, toluene-to-cumene ratio of 9:1, and a space time of 9.29 kg h/kmol. Kinetic modeling of the reaction was done to estimate the reaction kinetic constants and adsorption constants. The activation energy of the transalkylation was found to be 61.44 kJ/mol.

Keywords

Beta zeolite Rare earth metals Transalkylation Cymene Cumene Toluene 

Abbreviations

Ce

Cerium

CeB

Cerium-modified beta zeolite

DIPT

Diisopropyltoluene

Hbeta

Beta zeolite

k1, k2, k3

Kinetic constant, kgmol/kg h

Kc

Adsorption constant for cumene, atm−1

Kt

Adsorption constant for tolene, atm−1

La

Lanthanum

LaB

Lanthanum-modified beta zeolite

P

Total pressure, atm

\(p_{\text{A}}\)

Partial pressure of aliphatics, atm

\(p_{\text{ben}}\)

Partial pressure of benzene, atm

Pcum

Partial pressure of cumene, atm

\(p_{\text{cymene}}\)

Partial pressure of cymene, atm

\(p_{\text{DIPT}}\)

Partial pressure of DIPT, atm

Pr

Praseodymium

PrB

Praseodymium modified beta zeolite

\(p_{xyl}\)

Partial pressure of xylene, atm

Pt

Partial pressure of toluene, atm

\(- r_{\text{cum}}\)

Experimental rate of cumene conversion

\(X_{\text{A}}\)

Moles of aliphatics produced, kgmol

\(X_{\text{ben}}\)

Moles of benzene produced, kgmol

Xcum

Moles of cumene reacted, kgmol

\(X_{\text{cymene}}\)

Moles of cymene produced, kgmol

\(X_{\text{DIPT}}\)

Moles of DIPT produced, kgmol

Xexpt

Experimental fractional conversion

\(X_{\text{xyl}}\)

Moles of xylene produced, kgmol

Xpred

Predicted fractional conversion

Xt

Moles of toluene reacted, kgmol

τ

Space–time, kg h/kgmol

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2016

Authors and Affiliations

  • Ruchika Thakur
    • 1
  • Raj K. Gupta
    • 2
  • Sanghamitra Barman
    • 2
  1. 1.School of Chemistry and BiochemistryThapar UniversityPatialaIndia
  2. 2.Department of Chemical EngineeringThapar UniversityPatialaIndia

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