Well-ordered aluminosilicates(MAs)were prepared by in-situ assembly of pre-crystallized units of zeolite Y precursors at a commercial scale,and applied in an industrial fluid catalytic cracking unit for the first time...Well-ordered aluminosilicates(MAs)were prepared by in-situ assembly of pre-crystallized units of zeolite Y precursors at a commercial scale,and applied in an industrial fluid catalytic cracking unit for the first time.Compared with incumbent equilibrium catalyst,the surface area of trial equilibrium catalysts(30%inventory ratio)increased from 110 m^(2)g^(-1)to 120m^(2)g^(-1).Moreover,a significant increase of the mesoporous surfaceareaof trial equlibrium catalysts(30%inventoryrati)from 33 m g/to 40magi(22%increase).Furthermore,the equilibrium catalyst that contain 80%LPC-65 yields significantly lower heavy oil(0.23%)and higher total liquids(0.53%)compared with LDO-70.The industrial results demonstrated excellent hydrothermal stability and superior catalytic cracking properties,showing the promising futurein the industrial units.展开更多
The acidic strength of ordered mesoporous aluminosilicates of MAS-2, MAS-3, MAS-7 and MAS-9 and mi-croporous crystals of Y, L, beta, and ZSM-5 zeolites was systemically investigated by temperature-programmed desorptio...The acidic strength of ordered mesoporous aluminosilicates of MAS-2, MAS-3, MAS-7 and MAS-9 and mi-croporous crystals of Y, L, beta, and ZSM-5 zeolites was systemically investigated by temperature-programmed desorption of ammonia (NH3-TPD). Due to the use of preformed zeolite precursors of Y, L, beta and ZSM-5, the ordered mesoporous aluminosilicates with distinguished acidic strength were obtained, being dependent on the type of preformed zeolite precursors. Therefore, the acidic strength of these mesoporous aluminosilicates could be tai-lored and controlled.展开更多
Several 2.0 wt% nickel catalysts supported on nanometer bimodal mesoporous aluminosilicate (NBMAS), AlHMS and AlMCM-41 were prepared by means of the wetness impregnation method. The characterization tech-niques such a...Several 2.0 wt% nickel catalysts supported on nanometer bimodal mesoporous aluminosilicate (NBMAS), AlHMS and AlMCM-41 were prepared by means of the wetness impregnation method. The characterization tech-niques such as Py-FTIR and H2 chemisorption showed that the amount of Br鰊sted acid sites decreased in the order of Ni/AlHMS>Ni/AlMCM-41>Ni/NBMAS, while the nickel dispersion differed a little. In the catalytic n-dodecane hydroconversion, the highest conversion was obtained over Ni/NBMAS, and the lowest isomerization selectivity occurred over Ni/AlHMS. For the cracked products, the symmetrical carbon number distribution cen-tered at C6 was obtained on the Ni/AlMCM-41 catalyst due to the well balanced metal/acid functions, whereas the Ni/AlHMS and Ni/NBMAS catalysts led to more C3-C5 and C1+C11 products, respectively.展开更多
A unique templating approach for the synthesis of hexagonal mesoporous aluminosilicates via self assembly of pre formed aluminosilcate nanoclusters with the templating micella formed by cetyltrimethylammonium bromid...A unique templating approach for the synthesis of hexagonal mesoporous aluminosilicates via self assembly of pre formed aluminosilcate nanoclusters with the templating micella formed by cetyltrimethylammonium bromide (CTAB) is described. The obtained materials of MAS 5 are hydrothermally stable, which is shown by X ray diffraction (XRD) analysis. Furthermore, as characterized by NMR technique, MAS 5 has stable tetrahedral aluminum sites that is the major contributions to the acidity of aluminosilicate molecular sieve, and on non framework aluminium species in the samples was observed.展开更多
基金support through the research programs(Grant Nos.DQzX-KY-21-008,KYWX-21-023,and KYWX-21-022).
文摘Well-ordered aluminosilicates(MAs)were prepared by in-situ assembly of pre-crystallized units of zeolite Y precursors at a commercial scale,and applied in an industrial fluid catalytic cracking unit for the first time.Compared with incumbent equilibrium catalyst,the surface area of trial equilibrium catalysts(30%inventory ratio)increased from 110 m^(2)g^(-1)to 120m^(2)g^(-1).Moreover,a significant increase of the mesoporous surfaceareaof trial equlibrium catalysts(30%inventoryrati)from 33 m g/to 40magi(22%increase).Furthermore,the equilibrium catalyst that contain 80%LPC-65 yields significantly lower heavy oil(0.23%)and higher total liquids(0.53%)compared with LDO-70.The industrial results demonstrated excellent hydrothermal stability and superior catalytic cracking properties,showing the promising futurein the industrial units.
基金the National Natural Science Foundation of China (Nos. 29825108, 20173022 and 20121103), the Major State Basic Research Development Program (No. 20000077507) and the National Advanced Materials Committee of China.
文摘The acidic strength of ordered mesoporous aluminosilicates of MAS-2, MAS-3, MAS-7 and MAS-9 and mi-croporous crystals of Y, L, beta, and ZSM-5 zeolites was systemically investigated by temperature-programmed desorption of ammonia (NH3-TPD). Due to the use of preformed zeolite precursors of Y, L, beta and ZSM-5, the ordered mesoporous aluminosilicates with distinguished acidic strength were obtained, being dependent on the type of preformed zeolite precursors. Therefore, the acidic strength of these mesoporous aluminosilicates could be tai-lored and controlled.
基金Project supported by the National Key Fundamental Research and Development Projects of China (No. G1999022402).
文摘Several 2.0 wt% nickel catalysts supported on nanometer bimodal mesoporous aluminosilicate (NBMAS), AlHMS and AlMCM-41 were prepared by means of the wetness impregnation method. The characterization tech-niques such as Py-FTIR and H2 chemisorption showed that the amount of Br鰊sted acid sites decreased in the order of Ni/AlHMS>Ni/AlMCM-41>Ni/NBMAS, while the nickel dispersion differed a little. In the catalytic n-dodecane hydroconversion, the highest conversion was obtained over Ni/NBMAS, and the lowest isomerization selectivity occurred over Ni/AlHMS. For the cracked products, the symmetrical carbon number distribution cen-tered at C6 was obtained on the Ni/AlMCM-41 catalyst due to the well balanced metal/acid functions, whereas the Ni/AlHMS and Ni/NBMAS catalysts led to more C3-C5 and C1+C11 products, respectively.
文摘A unique templating approach for the synthesis of hexagonal mesoporous aluminosilicates via self assembly of pre formed aluminosilcate nanoclusters with the templating micella formed by cetyltrimethylammonium bromide (CTAB) is described. The obtained materials of MAS 5 are hydrothermally stable, which is shown by X ray diffraction (XRD) analysis. Furthermore, as characterized by NMR technique, MAS 5 has stable tetrahedral aluminum sites that is the major contributions to the acidity of aluminosilicate molecular sieve, and on non framework aluminium species in the samples was observed.
