Abstract
Pd-Na-MCM-22, Pd-H-MCM-22 and Pt-SAPO-11 catalysts were synthesized and characterized using techniques of X-ray powder diffraction, scanning electron microscopy, FTIR, nitrogen adsorption and X-ray fluorescency. The FTIR spectra of Pd and Pt modified MCM-22 and SAPO-11 exhibited lower amounts of Brønsted (B) and Lewis (L) acid sites than the unmodified MCM-22 and SAPO-11. The catalysts were tested in the transformation of n-butane to aromatic hydrocarbons. Aluminosilicate type of zeolite catalysts Pd-Na-MCM-22 and Pd-H-MCM-22 exhibited higher selectivity to aromatics than aluminophosphate Pt-SAPO-11. The pretreatment of the catalysts with oxygen and hydrogen was found to influence the n-butane conversion and selectivity to aromatic hydrocarbons. The hydrogen pretreated Pt-SAPO-11 exhibited higher n-butane conversion than the oxygen pretreated. The catalysts exhibited deactivation with time on stream due to coke formation and pore blocking. The specific surface areas of the Pt-SAPO-11, Pd-Na-MCM-22 and Pd-H-MCM-22 deactivated catalysts were found to be lower than the fresh because of coke deposits inside the pores.
| Original language | English |
|---|---|
| Pages (from-to) | 97-103 |
| Number of pages | 7 |
| Journal | Applied Catalysis A: General |
| Volume | 227 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 8 Mar 2002 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- Aromatization
- Catalyst synthesis
- Characterization
- Light hydrocarbons
- MCM-22
- n-Butane
- Noble metals
- SAPO-11
- Zeolite