CAJ | 학술논문

为了考察硅源对ZSM-5分子筛合成和催化性能的影响，分别采用白炭黑、硅胶、硅溶胶和单分散SiO2为硅源合成ZSM-5分子筛，对合成的ZSM-5分子筛进行XRD、SEM、BET和NH3-TPD表征，并以C4烯烃为原料评价合成的ZSM-5分子筛的催化裂解性能。结果表明，以硅溶胶为硅源合成的ZSM-5分子筛具有较好的结晶度和催化活性。水热处理使分子筛酸量减少，孔容缩小，改善了分子筛的乙烯丙烯选择性。经600℃水热处理4 h的ZSM-5分子筛在常压、580℃和空速9 h-1反应条件下，丁烯催化裂解为乙烯和丙烯平均转化率为90.2%，乙烯和丙烯总收率达61.1%。
위료고찰규원대ZSM-5분자사합성화최화성능적영향，분별채용백탄흑、규효、규용효화단분산SiO2위규원합성ZSM-5분자사，대합성적ZSM-5분자사진행XRD、SEM、BET화NH3-TPD표정，병이C4희경위원료평개합성적ZSM-5분자사적최화렬해성능。결과표명，이규용효위규원합성적ZSM-5분자사구유교호적결정도화최화활성。수열처리사분자사산량감소，공용축소，개선료분자사적을희병희선택성。경600℃수열처리4 h적ZSM-5분자사재상압、580℃화공속9 h-1반응조건하，정희최화렬해위을희화병희평균전화솔위90.2%，을희화병희총수솔체61.1%。
ZSM-5 zeolites were synthesized by using fumed-silica,silica gel,silica sol and monodisperse silica as silicon sources,respectively. The influence of silicon sources on synthesis and catalytic properties of ZSM-5 zeolites was investigated. The as-synthesized zeolites were characterized by XRD,SEM,BET and NH3-TPD,and their catalytic performance was evaluated by cracking of butene. The results indicated that the zeolite prepared with silica sol as silicon source exhibited higher relative crystallinity and better catalytic performance than other three zeolites. The hydrothermal treatment made the acid amount and pore volume of ZSM-5 zeolites decrease,which was favorable to the improvement of the selectivity to ethene and propene. Under the reaction condition of atmospheric pressure,580 ℃ and WHSV 9 h-1 ,the conversion of butene was 90 . 2% and the total yield of ethene and propene was 61 . 1% over ZSM-5 zeolite treated by stream at 600 ℃ for 4 h.