CAJ | 학술논문

在区分氢负离子转移反应与氢转移反应、非选择性氢转移反应与总的氢转移反应的情况下，通过合成物性相近但酸性不同的氧化铝，用以作为裂化催化剂基质材料，在固定床反应器上考察了催化裂化过程，基质酸性位类型及基质表面Lewis及Br?nsted酸性位接触顺序对小分子烯烃(丙烯、丁烯)收率的影响。结果表明，催化裂化生成小分子烯烃过程中，分子筛与基质所呈现出的反应特点存在较大的区别，前者活性虽高，但总的氢转移反应活性过强。基质材料裂化活性虽低但其表面以氢负离子转移反应为主，反应路径角度更有利于小分子烯烃收率的提高。另外，基质表面存在Br?nsted酸性位，或原料油首先与基质表面Lewis酸性位相接触再与Br?nsted酸性位反应的预裂化过程，会在促进裂化反应发生的同时抑制总的氢转移反应，更有利于小分子烯烃收率的提高。
재구분경부리자전이반응여경전이반응、비선택성경전이반응여총적경전이반응적정황하，통과합성물성상근단산성불동적양화려，용이작위열화최화제기질재료，재고정상반응기상고찰료최화열화과정，기질산성위류형급기질표면Lewis급Br?nsted산성위접촉순서대소분자희경(병희、정희)수솔적영향。결과표명，최화열화생성소분자희경과정중，분자사여기질소정현출적반응특점존재교대적구별，전자활성수고，단총적경전이반응활성과강。기질재료열화활성수저단기표면이경부리자전이반응위주，반응로경각도경유리우소분자희경수솔적제고。령외，기질표면존재Br?nsted산성위，혹원료유수선여기질표면Lewis산성위상접촉재여Br?nsted산성위반응적예열화과정，회재촉진열화반응발생적동시억제총적경전이반응，경유리우소분자희경수솔적제고。
A series of alumina with similar textural properties but different acidities were prepared and used as the matrix components of the FCC catalysts. The effect of acid type of matrices and contacting order of acid sites of different types on the yield of LPG olefins in catalytic cracking of heavy vacuum gas oil ( HVGO ) was investigated. The results showed that the matrix is more conductive to the formation of LPG olefins from the aspect of reaction route, in comparison with the REUSY molecular sieves. When there are Br?nsted acidity on the matrix surface and/or HVGO molecules first contact with Lewis acid sites and then react with Br?nsted acid sites during the matrix-precracking process, cracking reactions are enhanced while hydrogen transfer reactions are restricted, which facilitate to increase the yield of LPG olefins.