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Effect of the P/Al ratio on the performance of modified HZSM-5 for methanol dehydration reaction
Yadollah Tavan,Mohammad Reza Khosravi Nikou,Ahmad Shariati 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The precipitation method was used to modify HZSM-5 by coating it with aluminophosphate at P/Almolar ratios of 0.3, 0.8, 1.2 and 1.5. These catalysts were characterized by XRD, NH3-TPD, BET, FT-IR, ICPTEOSand SEM and evaluated as catalysts for the methanol dehydration reaction. The ZALPO0.8 catalystachieved 86% conversion which was the highest conversion till 315 ℃. It was found that primary benefitsof AlPO modification were that it tended to retard the activity of the highly active acid sites whichpromote dimethyl ether decomposition and led to decrease in the apparent activation energy.