Unique catalytic performance of mesoporous molecular sieves containing zeolite units in transformation of m-xylene

R. J. Balasamy; T. Odedairo; S. Al-Khattaf

doi:10.1016/j.apcata.2011.10.007

Unique catalytic performance of mesoporous molecular sieves containing zeolite units in transformation of m-xylene

R. J. Balasamy
, T. Odedairo
, S. Al-Khattaf^*

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

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

22 Scopus citations

Abstract

Integrating ZSM-5 zeolite units into two different mesostructured materials, led to high p-xylene selectivity in the transformation of m-xylene. The activity and selectivity of both composite materials were compared with those of Al-MCM-41, Al-MCM-48 and the conventional microporous ZSM-5. A bimolecular pathway involving disproportionation and transalkylation, together with the presence of ZSM-5 zeolite units in the composite materials, was responsible for this high p-xylene selectivity. The catalysts were characterized by powder XRD, TGA, SEM, nitrogen sorption and FT-IR of pyridine adsorption. The selectivity towards p-xylene over the different catalysts under study follows the order: conventional ZSM-5 < ZSM-5/MCM-48 < ZSM-5/MCM-41. The highest p-xylene selectivity noticed over ZSM-5/MCM-41 composite material indicates more transalkylation of trimethylbenzene molecules with m-xylene. The apparent activation energies for the transformation of m-xylene over both composite materials were found to decrease as follows: E_Z/48M-4, E_{Z/41M-4 (transalkylation)} > E_Z/48M-3, E _{Z/41M-3 (disproportionation)}.

Original language	English
Pages (from-to)	223-233
Number of pages	11
Journal	Applied Catalysis A: General
Volume	409-410
DOIs	https://doi.org/10.1016/j.apcata.2011.10.007
State	Published - 15 Dec 2011

Bibliographical note

Funding Information:
We are grateful for the support from Ministry of Higher Education, Saudi Arabia for the establishment of the Center of Research Excellence in Petroleum Refining and Petrochemicals at King Fahd University of Petroleum and Minerals (KFUPM). Mr. Mariano Gica is also acknowledged for his help during the experimental work. The support of King Fahd University of Petroleum and Minerals (KFUPM) is highly appreciated.

Keywords

Composite materials
m-Xylene transformation
p-Xylene

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/j.apcata.2011.10.007

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title = "Unique catalytic performance of mesoporous molecular sieves containing zeolite units in transformation of m-xylene",

abstract = "Integrating ZSM-5 zeolite units into two different mesostructured materials, led to high p-xylene selectivity in the transformation of m-xylene. The activity and selectivity of both composite materials were compared with those of Al-MCM-41, Al-MCM-48 and the conventional microporous ZSM-5. A bimolecular pathway involving disproportionation and transalkylation, together with the presence of ZSM-5 zeolite units in the composite materials, was responsible for this high p-xylene selectivity. The catalysts were characterized by powder XRD, TGA, SEM, nitrogen sorption and FT-IR of pyridine adsorption. The selectivity towards p-xylene over the different catalysts under study follows the order: conventional ZSM-5 < ZSM-5/MCM-48 < ZSM-5/MCM-41. The highest p-xylene selectivity noticed over ZSM-5/MCM-41 composite material indicates more transalkylation of trimethylbenzene molecules with m-xylene. The apparent activation energies for the transformation of m-xylene over both composite materials were found to decrease as follows: EZ/48M-4, EZ/41M-4 (transalkylation) > EZ/48M-3, E Z/41M-3 (disproportionation).",

keywords = "Composite materials, m-Xylene transformation, p-Xylene",

author = "Balasamy, \{R. J.\} and T. Odedairo and S. Al-Khattaf",

note = "Funding Information: We are grateful for the support from Ministry of Higher Education, Saudi Arabia for the establishment of the Center of Research Excellence in Petroleum Refining and Petrochemicals at King Fahd University of Petroleum and Minerals (KFUPM). Mr. Mariano Gica is also acknowledged for his help during the experimental work. The support of King Fahd University of Petroleum and Minerals (KFUPM) is highly appreciated. ",

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AU - Odedairo, T.

AU - Al-Khattaf, S.

N1 - Funding Information: We are grateful for the support from Ministry of Higher Education, Saudi Arabia for the establishment of the Center of Research Excellence in Petroleum Refining and Petrochemicals at King Fahd University of Petroleum and Minerals (KFUPM). Mr. Mariano Gica is also acknowledged for his help during the experimental work. The support of King Fahd University of Petroleum and Minerals (KFUPM) is highly appreciated.

PY - 2011/12/15

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N2 - Integrating ZSM-5 zeolite units into two different mesostructured materials, led to high p-xylene selectivity in the transformation of m-xylene. The activity and selectivity of both composite materials were compared with those of Al-MCM-41, Al-MCM-48 and the conventional microporous ZSM-5. A bimolecular pathway involving disproportionation and transalkylation, together with the presence of ZSM-5 zeolite units in the composite materials, was responsible for this high p-xylene selectivity. The catalysts were characterized by powder XRD, TGA, SEM, nitrogen sorption and FT-IR of pyridine adsorption. The selectivity towards p-xylene over the different catalysts under study follows the order: conventional ZSM-5 < ZSM-5/MCM-48 < ZSM-5/MCM-41. The highest p-xylene selectivity noticed over ZSM-5/MCM-41 composite material indicates more transalkylation of trimethylbenzene molecules with m-xylene. The apparent activation energies for the transformation of m-xylene over both composite materials were found to decrease as follows: EZ/48M-4, EZ/41M-4 (transalkylation) > EZ/48M-3, E Z/41M-3 (disproportionation).

AB - Integrating ZSM-5 zeolite units into two different mesostructured materials, led to high p-xylene selectivity in the transformation of m-xylene. The activity and selectivity of both composite materials were compared with those of Al-MCM-41, Al-MCM-48 and the conventional microporous ZSM-5. A bimolecular pathway involving disproportionation and transalkylation, together with the presence of ZSM-5 zeolite units in the composite materials, was responsible for this high p-xylene selectivity. The catalysts were characterized by powder XRD, TGA, SEM, nitrogen sorption and FT-IR of pyridine adsorption. The selectivity towards p-xylene over the different catalysts under study follows the order: conventional ZSM-5 < ZSM-5/MCM-48 < ZSM-5/MCM-41. The highest p-xylene selectivity noticed over ZSM-5/MCM-41 composite material indicates more transalkylation of trimethylbenzene molecules with m-xylene. The apparent activation energies for the transformation of m-xylene over both composite materials were found to decrease as follows: EZ/48M-4, EZ/41M-4 (transalkylation) > EZ/48M-3, E Z/41M-3 (disproportionation).

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JF - Applied Catalysis A: General

ER -

Unique catalytic performance of mesoporous molecular sieves containing zeolite units in transformation of m-xylene

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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