Abstract
The effect of the unit cell size of Y zeolites on their cracking performance has been investigated by X-ray diffraction, nitrogen adsorption, and VGO cracking reaction using a micro-activity test unit. Y zeolites with unit cell size in the range 24.21-24.60 Å were used as materials for fluid catalytic cracking. The matrix of the catalysts composed of kaoline filler and silica binder is quite inactive for VGO cracking. The intrinsic activity of the catalysts, defined as the rate constant of VGO cracking divided by the zeolite surface area, increases with increasing unit cell size and then decreases through a maximum and correlates directly with the number of 0-NNN aluminum atoms. This indicates that only 0-NNN aluminum atoms in the zeolite are the active sites responsible for VGO cracking. The increased coke yield with larger unit cell sizes can be attributed to the increased number of 1,2,3,4-NNN aluminum atoms.
| Original language | English |
|---|---|
| Pages (from-to) | 5-17 |
| Number of pages | 13 |
| Journal | Applied Catalysis A: General |
| Volume | 142 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Aug 1996 |
Bibliographical note
Funding Information:Financial support was provided by the Petroleum Energy Center under the organization of the Japan Petroleum Institute. One of the authors (SK) thanks the KFUPM/Research Institute and the Nippon Oil Company, Ltd., for allowing this work to be done in its Central Technical Research Laboratory and thanks Y. Nakatsuka, K. Kato, and T. Okuhara for their valuable assistance.
Keywords
- Cracking
- Fluid catalytic cracking
- Unit cell size
- Zeolite
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology