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CATALYTIC OXIDATION OF AIR POLLUTANTS FROM PULP AND PAPER INDUSTRY USING OZONE
Citation:
SAHLE-DEMESSIE, E., V. DEVULAPELLI, AND C. SEHKER. CATALYTIC OXIDATION OF AIR POLLUTANTS FROM PULP AND PAPER INDUSTRY USING OZONE. Presented at 37th Mid-Atlantic Industrial & Hazardous Waste Conference, Cincinnati, OH, March 22, 2007.
Impact/Purpose:
To inform the public
Description:
Major pollutants from pulp and paper mills include volatile organic compounds (VOCs) such as methanol and total reduced sulfur compounds (TRS) such as dimethyl sulfide. The conventional treatment technologies including incineration or catalytic thermal oxidation are energy intensive or require large amount of capital investment. In this study a series of vanadia catalysts were prepared using sol-gel and impregnation procedures by varying the vanadia content. Attempt has been made to introduce the basic property by incorporating the Mg in sol-gel process. The catalysts bulk and surface composition was determined by XRD and SEM-EDAX, respectively. Active site densities were measured by redox-titations using Micrometric sorption unit. The catalysts activity and stability were elucidated in vapor phase oxidation of methanol using ozone or oxygen as oxidant. Both oxygen and ozone produced mainly CO2 with small quantities of mythyl formate. However, in the presence of ozone the reaction temperature and the activation energies were significantly lower. The result of the study reveals that vanadia content has significant influence on the activity and the optimum V/Ti ratio is found to be equal to 0.4. Higher turnover frequencies were observed over sol-gel catalysts than catalyst prepared by the impregnation method. In the absence of ozone the catalysts observed very low activity where as the ozone is directly influencing the V4 and V5 redox cycle of the catalyst. No catalyst deactivation was observed for 40 hours of operation