摘要
催化裂化过程(FCC)中使用催化剂脱硫对生产清洁燃料具有重要意义。文中通过文献调研,阐述了噻吩类硫化物在FCC催化剂上的裂化依赖于B酸和L酸的协同作用原理,指出以L酸碱对化合物修饰FCC催化剂可改善其表面的弱L酸分布,增强催化剂对噻吩类硫化物的选择性吸附能力,提高FCC催化剂脱除噻吩类硫化物性能。氧化钒作为典型的L酸碱对化合物,利用其修饰FCC催化剂可改善裂化催化剂的脱硫活性。鉴于氧化钒对FCC催化剂的活性组分分子筛存在一定的破坏作用,FCC催化剂的载体是较适宜的修饰位置。低价态钒较高价态钒对噻吩有着更强的化学吸附能力,因而采用还原预处理后的催化剂可得到较好的脱硫效果。
It is important for producing clean fuel if the content of sulfur can be reduced by FCC catalyst in the fluidized-bed catalytic cracking （FCC） process. The cracking of thiophene sulfur on the FCC catalyst depends on the synergy of the Bronsted acid and Lewis acid from the literature. The distribution of the weak Lewis acid on the FCC catalyst can be improved when the catalyst is modified by compound that contains both Lewis acid and Bronsted acid, and then more thiophene sulfur can be adsorbed and cracked. As a typical compound mentioned above, FCC catalyst modified by vanadium oxide contributes to reduce thiophene sulfur. Because vanadium oxide may damage the active component of FCC catalyst, the FCC catalyst carrier is more suitable to be the modified part. Compared to high valence state of vanadium, low valence state vanadium has stronger chemical adsorption capacity, so adopting a reduction pretreatment can achieve a better removal effect.
出处
《化学工程》
CAS
CSCD
北大核心
2013年第4期69-73,共5页
Chemical Engineering(China)
关键词
钒
FCC催化剂
噻吩类硫化物
表面修饰
L酸碱对化合物
vanadium
FCC catalyst
thiophene sulfide
surface modification
compound containing both Lewis acid and Bronste acid
