以正十二烷为模型化合物 ,考察了不同类型分子筛和不同Y型分子筛的氢转移性能及其对裂化产物中液相烯烃产率的影响。结果表明 ,HY分子筛以具有更适合双分子氢转移反应的特点而具有最高的氢转移性能和最好的降烯烃效果。Y型分子筛中较高的稀土质量分数会促进分子筛的氢转移催化性能 ,但引起焦炭产率增加。含稀土分子筛的磷改性可以调变其表面酸性。磷改性后的分子筛不但具有良好的焦炭选择性 ,同时具有更好的氢转移性能 ,在此基础上提出了“选择性氢转移反应”的概念 Using n-dodecane as a model compound, the hydrogen transfer properties of different types of molecular sieves and different Y-type molecular sieves and their effects on the yield of liquid phase olefins in the cracked products were investigated. The results show that HY molecular sieve has the highest hydrogen transfer performance and the best olefin reduction effect with more suitable characteristics of bimolecular hydrogen transfer reaction. The higher rare earth content in Y zeolite will promote the hydrogen transfer catalytic performance of molecular sieve, but it will cause the increase of coke yield. Phosphate modified with rare earth molecular sieve can change the surface acidity. Phosphorus modified molecular sieve not only has good coke selectivity, but also has better hydrogen transfer properties, based on which the concept of “selective hydrogen transfer reaction” is proposed