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Hamed Rashidi,Ahmad Shariati,Mohammad Reza Khosravi Nikou,Touba Hamoule 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.8
MSU-S catalyst, assembled from ZSM-5 zeolite seed (MFI), was synthesized with silica to alumina ratio 55 and characterized by XRD, NH3-TPD, BET and FT-IR techniques. It was tested in a vertical fixed bed reactor for selective production of light olefins from methanol (MTO) at temperatures of 400, 450 and 500 oC and WHSV of 1, 5 and 25 h−1. After thorough investigation, it was found that WHSV=5 h−1 and temperature of 500 oC are the optimum conditions for maximum light olefin yield, which was 52% with propylene to ethylene ratio of 4.57. Acidity of MSU-S was promoted by incorporation of phosphotungusticacid (HPW) and a direct method to reach high HPW dispersion and thermal stability. Maximum light olefin yield was observed over HPW-MSU-S at the optimum reaction conditions to be nearly 60% with propylene to ethylene ratio of 4.3.
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.