SYNTHESIS AND STRUCTURAL STUDIES ON COII-Y AND A UNIQUE COII(HYDRAZONE)/Y ZEOLITES USING THEM AS EFFICIENT ALTERNATIVES FOR NOBLE METAL CATALYSTS | ||
| Al-Azhar Bulletin of Science | ||
| Article 9, Volume 2006, Issue 6, June 2006, Pages 113-126 PDF (438.96 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/absb.2006.11644 | ||
| Author | ||
| AYMAN H. AHMED* | ||
| Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt. | ||
| Abstract | ||
| CoII(SBSH)/Y has been prepared by solid-solid interaction of CoII-Y with salicylidinebenzenesulphonylhydrazone ligand using the flexible ligand method and its activity toward CO oxidation was examined and compared with CoII-Y. The composition and structure of this new catalyst have been identified. The prepared zeolites have been characterized by elemental analysis, FTIR, UV-Vis., magnetic measurements, XRD and thermal (TG, DTA) as well as surface area measurements and nitrogen adsorption studies. The results showed that the Co(II) ions in zeolite-Y are coordinated with the ligand through the (C=N), (NH), (SO2) and (OH) groups with replacing of one proton from the latter group forming 3:1 metal - ligand encapsulated complex differs completely from that prepared in solution. The resulting catalyst was found to be thermally stable up to 1000 °C. Adsorption of CO at room temperature on CoII-Y and CoII(SBSH)/Y showed peaks characteristic to CO2 (as an oxidation product) and different Co-carbonyl species which indicated the presence of different oxidation states of cobalt. The FTIR spectra indicated the presence of carboxyl group and different carboxylate species after CO adsorption at room temperature (RT). It is concluded that, the oxidation of CO on Con+ (n ≤ 2) sites is already starting at room temperature and hence it may be considered as an efficient alternative for noble metal catalysts used in the CO oxidation reaction. | ||
| Keywords | ||
| Zeolite encapsulated CoII -hydrazone complexes; FL method | ||
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