In-situ Synthesis and Catalytic Properties of ZSM-5/Rectorite Composites as Propylene Boosting Additive in Fluid Catalytic Cracking Process

作为多产丙烯催化裂化助剂的ZSM-5/累托土复合材料的原位合成和催化性能(英文)

Using rectorite extrudates from calcined rectorite powder as the starting material, a series of ZSM-5/rectorite composites were prepared via the in-situ crystallization method. The physicochemical properties and propylene boosting performance of the resulting samples were characterized by using X-ray diffraction, scan- ning electronic microscopy/energy dispersive spectrometer, N2 adsorption-desorption, and Fourier transformed in/tared spectroscopy of pyndine adsorption, respectively, and assessed by using Daqing atmospheric residue as Iced- stock. The results showed that the ZSM-5/rectorite composites in which the ZSM-5 phase grows inositu as a 2-3 p,m thick layer on rectorite particles have a trimodal microporous-mesoporous-macroporous structure and thus exhibit outstanding propylene boosting performance. Compared with a commercial ZSM-5 incorporated fluid catalytic cracking catalyst, the ZSM-5/rectorite composite incorporated catalyst increased the yield and selectivity of propylene by 2.44% and 5.35%, respectively.

Using rectorite extrudates from calcined rectorite powder as the starting material,a series of ZSM-5/rectorite composites were prepared via the in-situ crystallization method.The physicochemical properties and propylene boosting performance of the resulting samples were characterized by using X-ray diffraction,scan-ning electronic microscopy/energy dispersive spectrometer,N2 adsorption-desorption,and Fourier transformed in-frared spectroscopy of pyridine adsorption,respectively,and assessed by using Daqing atmospheric residue as feed-stock.The results showed that the ZSM-5/rectorite composites in which the ZSM-5 phase grows in-situ as a 2-3 μm thick layer on rectorite particles have a trimodal microporous-mesoporous-macroporous structure and thus exhibit outstanding propylene boosting performance.Compared with a commercial ZSM-5 incorporated fluid catalytic cracking catalyst,the ZSM-5/rectorite composite incorporated catalyst increased the yield and selectivity of pro-pylene by 2.44% and 5.35%,respectively.