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以固体硅胶为硅源 ,用水热法合成了 β沸石 ,并对其主要物化性质进行了表征 .将USY沸石和 β沸石按不同比例复配作为催化剂的活性组分 ,用标准轻油微反 (MAT)方法对各催化剂样品进行了评价 ,考察了 β沸石加入量对反应产物的分布、汽油产品的辛烷值及催化剂上的积炭等的影响 .将磷或稀土改性的 β沸石加入到裂化催化剂中 ,考察了不同改性方法对催化剂性能的影响 .结果表明 ,在裂化催化剂中分子筛总量保持不变的条件下 ,随着 β沸石加入量的增加 ,MAT活性指数逐渐提高 ,气体产物中i C=4 收率和汽油产品的辛烷值均提高 ,而催化剂上积炭明显下降 .当 β沸石的加入量超过一定比例后 ,气体产物中i C=4 收率明显提高 ,但催化剂的活性降低 .在 β沸石加入量相同的条件下 ,磷改性 β沸石可进一步提高催化剂的活性 ,降低积炭 ,但对汽油产品组成的影响不大
The zeolite beta was synthesized by hydrothermal method and its main physicochemical properties were characterized by using solid silica gel as the silicon source.The USY zeolite and zeolite beta were compounded in different proportions as the active components of the catalyst, MAT) method was used to evaluate the effect of the addition of zeolite beta on the distribution of reaction products, the octane number of gasoline products and the coke deposition on the catalyst, etc. Phosphorus or rare earth-modified zeolite beta was added to Cracking catalyst, the effects of different modification methods on the catalyst performance were investigated.The results showed that the MAT activity index gradually increased with the addition of zeolite beta, while the total amount of molecular sieve remained unchanged in the cracking catalyst. The gas product I C = 4 yield and the octane number of gasoline products are increased, while the catalyst coke decreased significantly when the amount of β zeolite exceeds a certain percentage, the gas product i C = 4 yield was significantly increased, but the catalyst Decreased.The activity of catalyst was further improved by phosphorus modified zeolite beta with the same amount of zeolite beta, and the carbon deposition was reduced, but the effect on the product composition of gasoline was not significant