FCC催化剂后处理工艺的探索

RESEARCH ON POST-TREATMENT OF FCC CATALYST

针对目前FCC催化剂制备方法工艺流程复杂的现状,进行催化剂后处理工艺条件的探索。直接以NaY分子筛与拟薄水铝石、铝溶胶、高岭土打浆混合,喷雾干燥得到催化剂粉体,对该催化剂粉体进行基本性质的表征。利用已经制备好未经改性的催化剂进行一次焙烧和一次稀土交换,再分别采用三次焙烧和三次常温(<90℃)铵盐交换、两次焙烧和两次高温(>90℃)铵盐交换,探索了优化的工艺条件,两种铵盐交换方法得到的催化剂中Na2O质量分数均达到0.3%以下。

Due to the complexity of present FCC catalyst preparation process, catalyst post-treatment technology was explored. NaY zeolite, pseudo-boehmite, aluminum sol and kaolin were mixed and spray-dried into catalyst microsphere NAY35. The basic properties of the unmodified NAY35 were characterized by XRF, XRD, BET. The NAY35 catalyst was treated by once calcination and then once rare earth ion exchange. The treated NAY35 was used as a starting precursor. The precursor was then trea- ted by three times calcinations and three times ammonium ion exchanges at normal temperature （〈90℃）, and two times calcinations and two times ammonium ion exchanges at high temperature （〉90 ℃ ）, respectively to explore the optimized post-treatment conditions for FCC catalyst. The test re-suits indicate that the Na2O contents in both prepared catalysts are less than 0.3%.