Synthesis of cobalt containing ZSM-5 |
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| Affiliation: | 1. Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand;2. Institute of Materials Chemistry/Physical Chemistry Division, Vienna University of Technology, Getreidemarkt 9/1060, Vienna, Austria;3. Center for Advanced Studies in Nanotechnology and Its Applications in Chemical, Food and Agricultural Industries, Kasetsart University, Bangkok 10900, Thailand;1. Federal University of São Carlos, Chemical Engineering Department, Catalysis Laboratory, 13565-905, São Carlos, SP, Brazil;2. Federal University of Alagoas, Institute of Chemistry and Biotechnology, Campus AC Simões, 57072-970, Maceio, AL, Brazil;1. Chemical Engineering Department, Federal University of São Carlos, São Carlos, São Paulo, Brazil;2. Physics Institute, Paulista State University, Araraquara, São Paulo, Brazil |
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| Abstract: | Cobalt-ZSM-5 is prepared by addition of various cobalt containing substrates to ZSM-5 synthesis gels. The existence and homogeneity of intrazeolitic cobalt is established from XPS and electron microprobe analyses. Variations in the synthesis gel composition were found to influence the amount of intrazeolitic cobalt in the ZSM-5. In at least one preparation, the ion exchange data are consistent with cobalt occupying framework sites. Cobalt-ZSM-5 exposure to 3 atm. H2 at 470°C and 21 atm. rsol|CO/H2 (1:1) at temperatures to 470°C did not reduce the cobalt to the zero-valent state and did not cause the cobalt to migrate to the outer surface of the ZSM-5. |
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