稀土改性SAPO-11分子筛及其异构化性能

采用过量溶液浸渍法，以硝酸镧为改性剂，对SAPO-11分子筛进行了稀土改性。结果表明:与未改性SAPO-11分子筛相比，改性后La/SAPO-11分子筛颗粒完整，具有较高的结晶度，介孔比表面积和介孔孔体积均增加，水热稳定性明显改善；在分子筛加入质量分数为6%的条件下，与ZSM-5分子筛相比，在La/SAPO-11（负载La质量分数为4%）分子筛制备的催化裂化（FCC）催化剂生产的产物中，汽油收率（质量分数，下同）与轻质油收率分别提高了0.34，0.24个百分点，汽油研究法辛烷值增加了0.5个单位；由该分子筛制备的FCC催化剂催化性能提高，异构化性能明显增强。

Rare earth modification of SAPO-11 molecular sieve and its isomerization performance

SAPO-11 molecular sieve was modified with rare earth elements by excess solution impregnation method with lanthanum nitrate as modifier. The results showed that compared with unmodified SAPO-11 molecular sieve，the modified La/SAPO-11 molecular sieve had showed more complete particles and higher crystallinity，higher mesoporous specific surface area and mesoporous volume， and its hydrothermal stability was significantly improved. Compared with catalyst prepared with ZSM-5 molecular sieve，the gasoline yield and light oil yield of the fluid catalytic cracking（FCC） catalyst prepared by La/SAPO-11（La load mass fraction of 4%） molecular sieve，had increased by 0.34 and 0.24 percentage points respectively，and the RON had increased by 0.5 units when the mass fraction of both mentioned molecular sieves in catalysts was 6%. The FCC catalyst containing the modified above prepared molecular sieve had exhibited higher catalytic performance and better isomerization performance.