关键词: 催化裂化, 原位晶化, 催化剂, 有机添加剂, 大孔

Abstract: NaY/kaolin composite microspheres and the corresponding FCC catalysts were prepared via in-situ synthesis by adding organic additives, starch and polymer PDDA. XRD, N2-adsorption and ACE were used to study the crystallinity, pore structures, and the cracking performances of the NaY/kaolin composites and catalysts. The results showed that the crystallinity of the composites is increased from 18% (blank) to 24% by adding starch or PDDA. The mesopore volume of the composites adding starch are increased from 0.180 cm3/g to 0.355 cm3/g, and further increased to 0.431 cm3/g by using PDDA additive. ACE tests showed the as-made catalyst using starch or PDDA improves the catalytic performances, the slurry yields are 1.98 and 2.43 percentage points lower than the reference, respectively, while the liquid yields increase 2.55 and 3.07 percentage points , respectively, compared to the catalysts prepared without additive.

Key words: FCC, in-situ crystallization, catalyst, organic additive, macropore