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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.
Ali Gharaee,Mohammad Reza Khosravi Nikou,Bagher Anvaripour 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Contaminated soil via crude oil was remediated through advanced oxidative process. A combination ofultraviolet and ultrasonic irradiation enhanced by Fenton reagents was presented as a promising methodwith high efficiency for this purpose. The total petroleum hydrocarbon (TPH) removing was designatedby central composite design (CCD) to operate at room temperature for 15 g/kg contaminant. The initialcontaminant concentration, hydrogen peroxide concentration, reaction time andfinally nano zero valentiron (NZVI) dosage were optimized to obtain high removal efficiency. It was found that sono-photo-Fenton oxidation has the highest removal efficiency among other methods.
Seyyed Yaghoob Hosseini,Mohammad Reza Khosravi Nikou 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
This research includes synthesis of nano-sized g-Al2O3 catalyst for methanol dehydration reaction toproduce DME. A co-precipitation method with four precipitants including sodium carbonate, sodiumbicarbonate, ammonium carbonate and ammonium bicarbonate was used for this purpose. The catalystswere characterized by XRD, FTIR, NH3-TPD, SEM, TEM and N2 adsorption–desorption techniques. In orderto investigate the catalyst activity, they were used in the fixed bed micro reactor for methanoldehydration reaction at different operating conditions. Also, a commercial γ-Al2O3 nanocatalyst wasutilized for comparison purposes. The catalyst prepared by ammonium carbonate showed the highestyield of DME in comparison with other ones.
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.