Transalkylation of toluene with trimethylbenzenes over large-pore zeolites

Andrea Krejčí; Sulaiman Al-Khattaf; Muhammad Ashraf Ali; Martina Bejblová; Jiří Čejka

doi:10.1016/j.apcata.2010.01.026

Transalkylation of toluene with trimethylbenzenes over large-pore zeolites

Andrea Krejčí
, Sulaiman Al-Khattaf
, Muhammad Ashraf Ali
, Martina Bejblová
, Jiří Čejka^*

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Zeolites Beta, mordenite and Y were evaluated for their activity in transalkylation reaction of toluene with trimethylbenzenes. Zeolite Beta was found to possess the highest conversion in toluene-trimethylbenzene transalkylation as well as a higher stability in time-on-stream compared with mordenite and zeolite Y. The effect of Si/Al ratio in zeolite Beta was evaluated and it was found that transalkylation activity and xylene yields increase with decreasing Si/Al ratio. Zeolite Beta with the lowest Si/Al ratio of 12.5 (the highest concentration of active sites) exhibited the highest 1,2,4-trimethylbenzene (124TMB) conversion and maximum xylene yield. The highest xylene yield was obtained at optimum equimolar ratio (1:1) of 124TMB to toluene. With increasing 124TMB concentration in the feed, the conversion of 124TMB and xylene yield decreased while toluene conversion simultaneously increased. The increase in the concentration of toluene in the feed resulted in the increase in the conversion of 124TMB. However, addition of higher concentrations of toluene led to a significant decrease in xylene yield.

Original language	English
Pages (from-to)	99-106
Number of pages	8
Journal	Applied Catalysis A: General
Volume	377
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2010.01.026
State	Published - 1 Apr 2010

Bibliographical note

Funding Information:
The authors express their appreciation to the support from the Ministry of Higher Education, Saudi Arabia in establishment of the Center of Research Excellence in Petroleum Refining and Petrochemicals (CoRE-PRP) at King Fahd University of Petroleum & Minerals (KFUPM). J. Čejka would like also to acknowledge the support by the Academy of Sciences of the Czech Republic (1QS400400560) .

Keywords

1,2,4-Trimethylbenzene
Large-pores zeolites
Mordenite
Si/Al ratio
Toluene
Transalkylation
Zeolite Y
Zeolites Beta

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/j.apcata.2010.01.026

Cite this

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title = "Transalkylation of toluene with trimethylbenzenes over large-pore zeolites",

abstract = "Zeolites Beta, mordenite and Y were evaluated for their activity in transalkylation reaction of toluene with trimethylbenzenes. Zeolite Beta was found to possess the highest conversion in toluene-trimethylbenzene transalkylation as well as a higher stability in time-on-stream compared with mordenite and zeolite Y. The effect of Si/Al ratio in zeolite Beta was evaluated and it was found that transalkylation activity and xylene yields increase with decreasing Si/Al ratio. Zeolite Beta with the lowest Si/Al ratio of 12.5 (the highest concentration of active sites) exhibited the highest 1,2,4-trimethylbenzene (124TMB) conversion and maximum xylene yield. The highest xylene yield was obtained at optimum equimolar ratio (1:1) of 124TMB to toluene. With increasing 124TMB concentration in the feed, the conversion of 124TMB and xylene yield decreased while toluene conversion simultaneously increased. The increase in the concentration of toluene in the feed resulted in the increase in the conversion of 124TMB. However, addition of higher concentrations of toluene led to a significant decrease in xylene yield.",

keywords = "1,2,4-Trimethylbenzene, Large-pores zeolites, Mordenite, Si/Al ratio, Toluene, Transalkylation, Zeolite Y, Zeolites Beta",

author = "Andrea Krej{\v c}{\'i} and Sulaiman Al-Khattaf and Ali, \{Muhammad Ashraf\} and Martina Bejblov{\'a} and Ji{\v r}{\'i} {\v C}ejka",

note = "Funding Information: The authors express their appreciation to the support from the Ministry of Higher Education, Saudi Arabia in establishment of the Center of Research Excellence in Petroleum Refining and Petrochemicals (CoRE-PRP) at King Fahd University of Petroleum \& Minerals (KFUPM). J. {\v C}ejka would like also to acknowledge the support by the Academy of Sciences of the Czech Republic (1QS400400560) .",

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doi = "10.1016/j.apcata.2010.01.026",

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journal = "Applied Catalysis A: General",

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T1 - Transalkylation of toluene with trimethylbenzenes over large-pore zeolites

AU - Krejčí, Andrea

AU - Al-Khattaf, Sulaiman

AU - Ali, Muhammad Ashraf

AU - Bejblová, Martina

AU - Čejka, Jiří

N1 - Funding Information: The authors express their appreciation to the support from the Ministry of Higher Education, Saudi Arabia in establishment of the Center of Research Excellence in Petroleum Refining and Petrochemicals (CoRE-PRP) at King Fahd University of Petroleum & Minerals (KFUPM). J. Čejka would like also to acknowledge the support by the Academy of Sciences of the Czech Republic (1QS400400560) .

PY - 2010/4/1

Y1 - 2010/4/1

N2 - Zeolites Beta, mordenite and Y were evaluated for their activity in transalkylation reaction of toluene with trimethylbenzenes. Zeolite Beta was found to possess the highest conversion in toluene-trimethylbenzene transalkylation as well as a higher stability in time-on-stream compared with mordenite and zeolite Y. The effect of Si/Al ratio in zeolite Beta was evaluated and it was found that transalkylation activity and xylene yields increase with decreasing Si/Al ratio. Zeolite Beta with the lowest Si/Al ratio of 12.5 (the highest concentration of active sites) exhibited the highest 1,2,4-trimethylbenzene (124TMB) conversion and maximum xylene yield. The highest xylene yield was obtained at optimum equimolar ratio (1:1) of 124TMB to toluene. With increasing 124TMB concentration in the feed, the conversion of 124TMB and xylene yield decreased while toluene conversion simultaneously increased. The increase in the concentration of toluene in the feed resulted in the increase in the conversion of 124TMB. However, addition of higher concentrations of toluene led to a significant decrease in xylene yield.

AB - Zeolites Beta, mordenite and Y were evaluated for their activity in transalkylation reaction of toluene with trimethylbenzenes. Zeolite Beta was found to possess the highest conversion in toluene-trimethylbenzene transalkylation as well as a higher stability in time-on-stream compared with mordenite and zeolite Y. The effect of Si/Al ratio in zeolite Beta was evaluated and it was found that transalkylation activity and xylene yields increase with decreasing Si/Al ratio. Zeolite Beta with the lowest Si/Al ratio of 12.5 (the highest concentration of active sites) exhibited the highest 1,2,4-trimethylbenzene (124TMB) conversion and maximum xylene yield. The highest xylene yield was obtained at optimum equimolar ratio (1:1) of 124TMB to toluene. With increasing 124TMB concentration in the feed, the conversion of 124TMB and xylene yield decreased while toluene conversion simultaneously increased. The increase in the concentration of toluene in the feed resulted in the increase in the conversion of 124TMB. However, addition of higher concentrations of toluene led to a significant decrease in xylene yield.

KW - 1,2,4-Trimethylbenzene

KW - Large-pores zeolites

KW - Mordenite

KW - Si/Al ratio

KW - Toluene

KW - Transalkylation

KW - Zeolite Y

KW - Zeolites Beta

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VL - 377

SP - 99

EP - 106

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1-2

ER -

Transalkylation of toluene with trimethylbenzenes over large-pore zeolites

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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