Preparation of H-ZSM-5 Nano-Zeolite Using Mixed Template Method and its Activity Evaluation for ethanol to DME Reaction

Document Type : Research Paper

Authors

Chemical Engineering Department, Babol University of Technology, Babol, I. R. Iran

Abstract

H-ZSM-5 nano-zeolites were synthesized by hydrothermal method using tetrapropylammonium hydroxide (TPAOH) as a template in the presence of various TPABr concentrations. The effect of different TPABr/TPAOH molar ratios was studied on the catalytic performance of dehydration of methanol to dimethyl ether (DME) in a fixed bed reactor under the same operating conditions (T=300°C, P=1 atm, and WHSV=26 h−1). The prepared catalysts were characterized by XRD, SEM, BET and NH3-TPD. The characterization results showedthat the crystal sizes of the catalysts enlarge by increasing the concentration of TPABrin the synthesis reaction mixture. It was observed that H-form zeolite catalysts were active and selective for DME synthesis. These catalysts showed a high methanol conversion and also very high DME selectivity. It was found that by addition of up to 10 mole% TPABr in the synthesis reaction mixture, no significant effect was observed on the physical and chemical properties and catalytic activity of prepared catalysts.

Keywords

International Journal of Nanoscience and Nanotechnology
Volume 10, Issue 3 - Serial Number 3
September 2014
Pages 171-180

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