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CoAPSO-34 촉매상에서 DTO (Dimethyl Ether to Olefins) 반응에 미치는 Co/Al 및 Si/Al 몰 비의 영향
김효섭 ( Hyo Sub Kim ),이수경 ( Su Gyung Lee ),최기환 ( Ki Hwan Choi ),이동희 ( Dong Hee Lee ),박주식 ( Chu Sik Park ),김영호 ( Young Ho Kim ) 한국공업화학회 2015 공업화학 Vol.26 No.2
Effects of Co/Al and Si/Al molar ratios of cobalt incorporated SAPO-34 catalysts (CoAPSO-34) on their catalytic lifetime were investigated in dimethyl to olefin (DTO) reaction. The property of CoAPSO-34 catalysts was characterized using XRD, SEM, 29Si MAS NMR, and NH3-TPD techniques. First, the lifetime of CoAPSO-34 prepared by varying Co/Al molar ratios was improved than that of using the SAPO-34 catalyst, and the optimal Co/Al molar ratio was 0.0025. The total acid site amounts increased from 0.432 to 1.111 mmol/g with increasing Si/Al molar ratios from 0.05 to 0.20 while fixing a Co/Al molar ratio of 0.0025. However, the catalysts with too high acid site amounts were deactivated rapidly with blockages of the pores due to the fast accumulation of polycyclic aromatic hydrocarbons in the cage. Therefore, the CoAPSO-34 catalyst with a proper Si/Al molar ratio of 0.10 was the most superior in terms of the lifetime, which was improved by about 87% as compared with that of the SAPO-34 catalyst.