不同高岭土系黏土性质及在催化裂化催化剂中的应用

随着原料油重质化、劣质化程度逐渐增高,催化裂化催化剂基质不仅需要保证催化剂有良好的磨损性能和流化性能,还需要具有适当的孔和一定的酸性对原料油中的大分子进行预裂化。半合成催化裂化催化剂中的高岭土系黏土对催化剂性能有重要影响。高岭土可直接或经酸、碱改性作为催化剂基质,也可通过原位晶化技术合成分子筛或含有Y型分子筛的催化剂。累托石通过交联反应可以合成层柱分子筛用于催化裂化催化剂制备。埃洛石因其管状结构,作为基质时催化剂具有孔体积和比表面积大及活性高的特点。对催化裂化催化剂中高岭土系黏土结构、改性方法及在催化裂化催化剂中应用进行综述,并对今后高岭土在催化裂化催化剂中的研究方向进行展望。

Properties of different kaolin clays and their application in FCC catalysts

With using heavier and inferior quality of crude oil,catalytic cracking catalyst matrix not only ensures good attrition resistance and fluidization performance,but also needs proper pore and certain acidity to pre-crack the large molecule in raw oil.The kaolin clay in semi synthetic FCC catalyst has an important effect on performance of catalyst.Kaolin can be used as catalyst matrix directly or modified by acid or alkali,it also can be used to synthesize zeolites or catalysts containing zeolite Y by in-situ crystallization technique.Interlayered clay molecular sieve can be synthesized by cross-linking reaction of rectorite for catalytic cracking catalysts preparation.Because of its tubular structure,catalysts synthesized of halloysite have characteristics of large pore volume,large specific surface area and high activity.The clay structure,modification methods and application in catalytic cracking of kaolin clay in FCC catalysts are reviewed and the future research direction of kaolin clay in FCC catalyst is prospected.