CAJ | 학술논문

采用不同方法表征了硅铝比(SiO2/Al2O3)为33、266和487的质子型ZSM-5分子筛，并研究了ZSM-5分子筛作为助催化剂在渣油裂解中的应用。与USY分子筛基催化剂混合后，在固定流化床上，评价了ZSM-5分子筛助催化剂的催化裂化性能。研究发现，提高ZSM-5分子筛硅铝比，可以有效抑制混合催化剂对汽油烯烃的裂解，从而避免了汽油烷烃的大量损失。加入ZSM-5助催化剂后，伴随着液化气(LPG)产率的增加，异丁烷和异戊烷产率增加，这可能是由USY基催化剂和ZSM-5助催化剂的综合效应引起的。汽油烷烃和芳烃含量的变化，引起了汽油辛烷值的增加。高硅铝比ZSM-5分子筛(硅铝比为266和487)不仅可以显著改善汽油的辛烷值，而且有效避免了汽油的大量损失。催化汽油辛烷值的改善主要是由于高硅铝比ZSM-5分子筛具有适宜的芳构化和异构化活性，这些变化主要源于高硅铝比ZSM-5分子筛小的孔道直径和适宜的酸性。
채용불동방법표정료규려비(SiO2/Al2O3)위33、266화487적질자형ZSM-5분자사，병연구료ZSM-5분자사작위조최화제재사유렬해중적응용。여USY분자사기최화제혼합후，재고정류화상상，평개료ZSM-5분자사조최화제적최화열화성능。연구발현，제고ZSM-5분자사규려비，가이유효억제혼합최화제대기유희경적렬해，종이피면료기유완경적대량손실。가입ZSM-5조최화제후，반수착액화기(LPG)산솔적증가，이정완화이무완산솔증가，저가능시유USY기최화제화ZSM-5조최화제적종합효응인기적。기유완경화방경함량적변화，인기료기유신완치적증가。고규려비ZSM-5분자사(규려비위266화487)불부가이현저개선기유적신완치，이차유효피면료기유적대량손실。최화기유신완치적개선주요시유우고규려비ZSM-5분자사구유괄의적방구화화이구화활성，저사변화주요원우고규려비ZSM-5분자사소적공도직경화괄의적산성。
Three proton-type ZSM-5 zeolites with different SiO2/Al2O3 ratios (SARs) of 33, 266, and 487 were characterized and examined as fluid catalytic cracking catalyst additives for residue oil cracking. The catalytic performance of the ZSM-5 additives was evaluated using an ultra-stable Y-zeolite (USY)-based fluid catalytic cracking catalyst in a fixed fluid bed unit. As observed, the cracking of primary olefins over the hybrid catalysts consisting of USY-based catalyst and ZSM-5 additive was considerably inhibited by increasing the SAR of the ZSM-5 zeolite, thus avoiding substantial loss of gasoline paraffins. The introduction of ZSM-5 additives led to higher liquid petroleum gas yields as well as higher isobutane and isopentane yields. The improved yields were attributed to the com-bined effects of the ZSM-5 additives and USY-based catalyst. The variations of gasoline paraffins and aromatics both accounted for the enhancement in the octane number values. The use of ZSM-5 with higher SARs (266 and 487) led to an enhancement in the octane number with minimal loss of gaso-line. This enhancement was mainly attributed to the moderate aromatization and isomerization reactivity of the ZSM-5 additives that mainly originated from their relatively small pores and suita-ble acidic properties with higher SARs.