caa a22 4500 469126337 CHVBK 20180323133151.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF02697407 doi (NATIONALLICENCE)springer-10.1007/BF02697407 Preparation and characterization of vanado-, ferri-, and gallosilicate catalysts in the presence of fluoride ions [Elektronische Daten] [Suk Hong, Chang Kim, Young Uh, Yong Park, Seong Woo] Vanado-, ferri-, and gallosilicate catalysts were prepared from the mixtures containing colloidal silica, corresponding metal source, tetrapropylammonium bromide, and NH4F by hydrothermal crystallization at 175°C for 7 days. The pH value of the reaction mixture was low (pH<8) compared to the conventional methods. The metal compounds have higher solubilites in these conditions than conventional conditions (pH>10). The size distribution and the size of final products were found to be more homogeneous and larger than those of metallosilicates prepared in strong alkaline media. The characterization of metallosilicates with IF!, X-ray diffraction, SEM, EPR, and29Si MAS NMR, indicated that corresponding metal atoms were successfully incorporated into the tetrahedral lattice sites of the ZSM-5 structure. Korean Institute of Chemical Engineering, 1992 Hong Suk Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut Kim Chang Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut Uh Young Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut Park Yong Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut Woo Seong Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut Korean Journal of Chemical Engineering Springer-Verlag 9/1(1992-01-01), 16-22 0256-1115 9:1<16 1992 9 11814 https://doi.org/10.1007/BF02697407 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02697407 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hong Suk Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut NATIONALLICENCE 700 1- Kim Chang Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut NATIONALLICENCE 700 1- Uh Young Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut NATIONALLICENCE 700 1- Park Yong Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut NATIONALLICENCE 700 1- Woo Seong Department of Chemical Engineering, KAIST, P.O. Box 150, Cheongryang, Seoul, Korea aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer-Verlag 9/1(1992-01-01), 16-22 0256-1115 9:1<16 1992 9 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer