Synthesis of Si-Modified Pseudo-Boehmite@kaolin Composite and Its Application as a Novel Matrix Material for FCC Catalyst

Abstract

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.

Study on the Regeneration of Waste FCC Catalyst by Boron Modification

“…Figure 4 exhibits the NH 3 -TPD profiles of ECat and R-ECat. As it shown, both ECat and R-ECat display two main NH 3 -desorption peaks at around of 200 °C and 400 °C respectively, which could be attributed to moderated acid sites and strong acid sites respectively [ 17 ]. Compared with ECat, the NH 3 -desorption peak area at around of 400 °C for R-ECat obviously decreases, indicating the strong acid sites of R-ECat are successfully weaken by boron modification.…”

The Research on Anti-Nickel Contamination Mechanism and Performance for Boron-Modified FCC Catalyst

“…Presently, fluid catalytic cracking (FCC) is still a main processing technology for crude oil lightening and has occupied a very important position in the refining area, in which the FCC catalyst is considered as a critical factor that could greatly influence the state of the FCC unit [ 1 , 2 , 3 ]. In recent years, as the quality deterioration of crude oil has become more and more serious worldwide, the heavy metals content in crude oil has been significantly increased, which has called for the excellent heavy metals-tolerance performance of FCC catalysts [ 4 , 5 , 6 ].…”