In this letter, the changes of aluminum content, acid amount and catalytic properties of AlMCM-41 after treatment by NaAlO2 in the presence/absence of cetyltrimethylammonium bromide (CTAB) were studied. The samples we...In this letter, the changes of aluminum content, acid amount and catalytic properties of AlMCM-41 after treatment by NaAlO2 in the presence/absence of cetyltrimethylammonium bromide (CTAB) were studied. The samples were characterized by XRD, N2 adsorption-desorption isotherm, 27Al MAS NMR and NH3-TPD. Characterization results revealed that the introduction of CTAB during the modification process played a crucial role in the adjustment of surface properties of AlMCM-41 including distribution of aluminum atoms and acid site numbers, otherwise the original ordered AlMCM-41 would be completely destroyed.展开更多
A series of Ni/AlMCM-41 catalysts with different nickel contents was prepared via the incipient wetness impregnation method. The effects of the nickel content on the structure, acidity and metal function of the cataly...A series of Ni/AlMCM-41 catalysts with different nickel contents was prepared via the incipient wetness impregnation method. The effects of the nickel content on the structure, acidity and metal function of the catalysts were studied by using different techniques. In the test of n-dodecane hydroconversion, it was found that the metal and acid functions were well balanced over a 2.0%Ni(mass fraction)/AlMCM-41 catalyst, which gave the maximal isomerization selectivity and a homolytic cleavage products.展开更多
The AlMCM-41 molecular sieves with two different pore sizes are hydrothermally synthesized in the presence of surfactants with two different chain lengths. H-AlMCM-41 and Ru-Sn-B/H-AlMCM-41 which are prepared by the ...The AlMCM-41 molecular sieves with two different pore sizes are hydrothermally synthesized in the presence of surfactants with two different chain lengths. H-AlMCM-41 and Ru-Sn-B/H-AlMCM-41 which are prepared by the conventional ion-exchange and incipient wetness techniques of the AlMCM-41 show fair catalytic activity for esterification of glycerol by oleic acid and selective hydrogenation of oleic acid methylester, respectively.展开更多
基金Beijing Natural Science Foundation(2052009)Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality(PHR200907129)
文摘In this letter, the changes of aluminum content, acid amount and catalytic properties of AlMCM-41 after treatment by NaAlO2 in the presence/absence of cetyltrimethylammonium bromide (CTAB) were studied. The samples were characterized by XRD, N2 adsorption-desorption isotherm, 27Al MAS NMR and NH3-TPD. Characterization results revealed that the introduction of CTAB during the modification process played a crucial role in the adjustment of surface properties of AlMCM-41 including distribution of aluminum atoms and acid site numbers, otherwise the original ordered AlMCM-41 would be completely destroyed.
基金the Funds for the National Key Fundamental Research and Developm ent Projects of China (No.G19990 2 2 4 0 2 )
文摘A series of Ni/AlMCM-41 catalysts with different nickel contents was prepared via the incipient wetness impregnation method. The effects of the nickel content on the structure, acidity and metal function of the catalysts were studied by using different techniques. In the test of n-dodecane hydroconversion, it was found that the metal and acid functions were well balanced over a 2.0%Ni(mass fraction)/AlMCM-41 catalyst, which gave the maximal isomerization selectivity and a homolytic cleavage products.
文摘The AlMCM-41 molecular sieves with two different pore sizes are hydrothermally synthesized in the presence of surfactants with two different chain lengths. H-AlMCM-41 and Ru-Sn-B/H-AlMCM-41 which are prepared by the conventional ion-exchange and incipient wetness techniques of the AlMCM-41 show fair catalytic activity for esterification of glycerol by oleic acid and selective hydrogenation of oleic acid methylester, respectively.
