Abstract
It was found that the high acidity of H-Y-zeolite increases paring reaction, in addition to the well-known isomerization and disproportionation pathways. A significant drop in trimethyl-benzenes (TMBs) yields and a rise in benzene, gases and coke yields were observed with both reaction temperature and catalyst acidity. The p-xylene/o-xylene (P/O) ratio was found to be independent of zeolite acidity. m-Xylene transformation has been studied on as-prepared H-Y and a series of dealuminated Y-zeolite catalysts. The conversion of m-xylene was found to increase initially with acidity, however, decreases subsequently. It was proposed that the high concentration of acid sites in the H-Y catalyst increases paring reaction, in addition to the well-known isomerization and disproportionation pathways. A significant decrease in trimethyl-benzenes (TMBs) yields was observed with both reaction temperature and catalyst acidity. The p-xylene/o-xylene (P/O) ratio was found to be independent of zeolite acidity. A higher coke deposition was found in the transformation of m-xylene over the parent H-Y as compared to the highly dealuminated USY zeolite. The formation of benzene and C 2-C 4 gases was found to be proportional to zeolite acid concentration.
| Original language | English |
|---|---|
| Pages (from-to) | 117-124 |
| Number of pages | 8 |
| Journal | Journal of Molecular Catalysis A: Chemical |
| Volume | 225 |
| Issue number | 1 |
| DOIs | |
| State | Published - 4 Jan 2005 |
Bibliographical note
Funding Information:The authors gratefully acknowledge King Fahd University of Petroleum & Minerals for the financial support provided for this work under the project 255. The authors would like to thank Mr. Maraino Gica for his help in the experimental work.
Keywords
- Disproportionation
- Isomerization
- Paring reaction
- Y-zeolite
- m-Xylene transformation
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology
- Physical and Theoretical Chemistry