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Preparation and Application of Intercalated Zinc Oxide Carbon Molecular Sieves
- Synthetic carbon molecular sieves (CMS) have been prepared by pyrolysis of polyvinyl chloride (PVC) at different temperatures. Pyrolysis of PVC at different temperatures showed polymer derived carbon was formed. Only at the optimum temperature of 900ºC, a thermally stable CMS with a yield of 3.03% was found to be produced. It was also characterized for its molecular sieves character by EDXRF, FT-IR, XRD, SEM, TGA and DSC (thermal analyses). The thermal stability of carbon molecular sieves was confirmed by TGA and DSC. FT-IR, XRD, SEM indicates the semi-crystallite structure (graphitic layer) and mesoporous nature of carbon molecular sieves. The prepared carbon molecular sieves at 600ºC to 900ºC were tested with iodine solution, methylene blue solution and phenol solution, three of the chemical sorption tests used to characterize the nature of carbon molecular sieves. Intercalated zinc oxide carbon molecular sieves (ZnO -CMS) has been prepared by using polyvinyl chloride (PVC) derived carbon molecular sieves (CMS) and zinc oxide at various temperatures of 300ºC to 900ºC. It was found to be most effective in the intercalation of zinc oxide particularly at 600ºC and 18.09 ± 1 % of zinc (22.5 ±1% of ZnO) was intercalated in the CMS matrix. Only at these temperatures intercalation of zinc oxide was observed to take place because of the thermal stability of CMS, particularly at 900'C. Intercalative nature of zinc oxide in the graphitic CMS was characterized by-using EDXRF, XRD, SEM, TGA and DSC (thermal analyses). The intercalation of zinc oxide was revealed by XRD, SEM studies of ZnO-CMS morphology before and after acid and base treatments on the intercalated sample. The catalytic activity performances of prepared intercalation zinc oxide carbon molecular sieves (ZnO-CMS) were used in the specific and lean air catalytic oxidation of methanol to formaldehyde. The liquid product was confirmed by organic qualitative test and FT-IR spectrum. The formaldehyde content was determined by iodimetric method. It was found that 12.16% strength of formaldehyde was achieved. The use of the intercalated compound as catalyst in this organic conversion shows that the zinc oxide carbon molecular sieves as an efficient and active catalyst.
Khin Mar Tun
- Universities Research Journal (URJ)