Font Size: a A A

Preparation Of Mesoporous Catalyst And Application In Wet Air Oxidation

Posted on:2009-10-24Degree:MasterType:Thesis
Country:ChinaCandidate:N LiuFull Text:PDF
GTID:2121360245986404Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
Wet air oxidation (WAO)is one technology for the treatment of hazardous, toxic and high concentrated organic wastewater under the high temperature and pressure However, the severe operation conditions have restricted it from being widely used. Catalytic wet oxidation technique (CWAO) gains great attention for it could decrease reaction temperature and press, shorten reaction time and raise oxidation efficiency, so the development of catalysts with high activity and stability has been focally researched and become the key point of CWAO application.In this paper, ordered mesoporous silicates assembled from preformed nanosized aluminosilicate zeolites in basic media was prepared successfully. CuO was loaded in MSU-s by soakage, direct inserting and precursor soakage, so CuO/MSU-s was prepared.Mesoporous catalyst CuO/MSU-s was tried to used in Catalyst Wet air oxidation(CWAO), which is used to treat hazardous, toxic and high concentrated organic wastewater under the high temperature and pressure. The technical conditions such as the content of CuO, calcination temperature and calcination time were optimized. and the optimum content of CuO is 3%. Applied this techinics to CWAO of H-acid and optimized.The processing parameters such as reaction temperature and dosage of the catalyst were optimized. The optimized conditions was get as follows: reaction temperature is 170℃, oxygen partial pressure is 3MPa, and dosage of the catalyst is 1g/L. TG-DTA, XRD and N2 adsorption-desorption were used to investigate the relationship between the microstructure and catalytic activity and that between the reusing times and catalytic activity. The results showed that the decreasing of the catalytic activity should be ascribed to the damage of the mesoporous formation in high temperature. If using soakage catalyst to make CWAO experiment, the COD removal is only 80.67%; if using direct inserting to prepare CuO/MSU-s, the COD removal can be 94.81%; but the direct inserting is hard to realize, therefore, in this paper, we tried to use precursor soakage to prepare CuO/MSU-s. We found that this method is simple, and it can keep perfect structure. the COD removal can be 92.6%.
Keywords/Search Tags:catalytic wet air oxidation, mesoporous catalyst, Cu(NO3)2, H-acid
PDF Full Text Request
Related items