Citation: MAO Dong-Sen, GUO Qiang-Sheng, MENG Tao. Effect of Magnesium Oxide Modification on the Catalytic Performance of Nanoscale HZSM-5 Zeolite for the Conversion of Methanol to Propylene[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2242-2248. doi: 10.3866/PKU.WHXB20100814 shu

Effect of Magnesium Oxide Modification on the Catalytic Performance of Nanoscale HZSM-5 Zeolite for the Conversion of Methanol to Propylene

1.
Research Institute of Applied Catalysis, School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 200235, P. R. China

Received Date: 4 March 2010
Available Online: 18 June 2010
Fund Project: 上海市教委重点科研项目(06ZZ81) (06ZZ81)上海市教委重点学科建设项目(J51503)资助 (J51503)

A series of nanoscale HZSM-5 zeolites modified with different amounts (0-8%, w) of magnesium were prepared by an impregnation method and characterized by X-ray diffraction (XRD), Al solid state magic angle spinning nuclear magnetic resonance (²⁷Al MAS NMR), N₂-adsorption/desorption, temperature-programmed desorption of NH₃ (NH₃-TPD), and pyridine adsorption Fourier transform infrared (FT-IR) methods. The conversion of methanol to propylene was tested in a continuous flow fixed-bed microreactor at atmospheric pressure, 500 ℃, and a methanol space velocity (WHSV) of 1.0 h^-1. The results indicated that with an increase in the amount of Mg, the selectivity of propylene and butene increased but those of methane, ethylene and aromatics decreased consistently. With an increase in the amount of Mg the stability of the catalyst was found to increase initially, pass through a maximum at 2% and then decrease with higher amounts of Mg. The effect of modification with magnesium oxide on the catalytic performance of the nanoscale HZSM-5 zeolite for the conversion of methanol to propylene can be attributed to the resultant changes in acidity and texture of the modified nanoscale HZSM-5 zeolites.
- Methanol,
- Propylene,
- Nanoscale HZSM-5 zeolite,
- Magnesium oxide modification,
- Selectivity,
- Stability
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