Yuan Chengyuan, Li Zhongfu, Zhou Lei, Ju Guannan
School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China.
Materials (Basel). 2022 Mar 15;15(6):2169. doi: 10.3390/ma15062169.
Fluid catalytic cracking (FCC) has been the primary processing technology for heavy oil. Due to the inferior properties of heavy oil, an excellent performance is demanded of FCC catalysts. In this work, based on the acid extracting method, Si-modified pseudo-boehmite units (Si-PB) are constructed in situ and introduced into the structure of kaolin to synthesize a Si-PB@kaolin composite. The synthesized Si-PB@kaolin is further characterized and used as a matrix material for the FCC catalyst. The results indicate that, compared with a conventional kaolin matrix, a Si-PB@kaolin composite could significantly improve the heavy oil catalytic cracking performance of the prepared FCC catalyst because of its excellent properties, such as a larger surface area, a higher pore volume, and a good surface acidity. For the fresh FCC catalysts, compared with the FCC catalysts using conventional kaolin (Cat-1), the gasoline yield and total liquid yield of the catalyst containing Si-PB@kaolin (Cat-2) could obviously increase by 2.06% and 1.55%, respectively, with the bottom yield decreasing by 2.64%. After vanadium and nickel contamination, compared with Cat-1, the gasoline yield and total liquid yield of Cat-2 could increase by 1.97% and 1.24%, respectively, with the bottom yield decreasing by 1.80 percentage points.
流化催化裂化（FCC）一直是重油的主要加工技术。由于重油性质较差，对FCC催化剂提出了优异性能的要求。在本工作中，基于酸萃取法，原位构建硅改性拟薄水铝石单元（Si-PB）并引入高岭土结构中，合成了Si-PB@高岭土复合材料。对合成的Si-PB@高岭土进行进一步表征，并用作FCC催化剂的基质材料。结果表明，与传统高岭土基质相比，Si-PB@高岭土复合材料由于具有较大的表面积、较高的孔体积和良好的表面酸性等优异性能，能够显著提高所制备FCC催化剂的重油催化裂化性能。对于新鲜的FCC催化剂，与使用传统高岭土的FCC催化剂（Cat-1）相比，含Si-PB@高岭土的催化剂（Cat-2）的汽油产率和总液体产率分别可明显提高2.06%和1.55%，而底部产物产率降低2.64%。在受到钒和镍污染后，与Cat-1相比，Cat-2的汽油产率和总液体产率分别可提高1.97%和1.24%，底部产物产率降低1.80个百分点。
