The effect of sulfur poisoning of dimethyl disulfide on the catalytic incineration over a Pt/Al 2O 3 catalyst

Abstract

Catalytic incineration was one of the cost-effective technologies to solve the troublesome VOCs. However, some sulfur containing VOCs, such as dimethyl disulfide, may deactivate the Pt catalyst that was commonly used in the catalytic incineration process. This article provides information on the poisoning effect of dimethyl disulfide. The catalytic incineration of dimethyl disulfide and ethanol, typically emitted from the petrochemical industry, over a Pt/Al 2O 3 fixed bed catalytic reactor were studied. The effects of operating parameters including inlet temperature, space velocity, VOCs concentration, O 2 concentration and catalyst size were characterized. Catalytic incineration on a mixture of dimethyl disulfide and ethanol was also tested. The results show that the conversions of C 2H 5OH and (CH 3)S 2 increase as the inlet temperature increases and the space velocity decreases. The higher the C 2H 5OH concentration is, the higher its conversion is. However, the reverse is true for the case of (CH 3) 2S 2. The O 2 concentration has no effects on the conversion of C 2H 5OH but has a positive effect on the conversion of (CH 3) 2S 2. (CH 3) 2S 2 has a poisoning effect on the Pt/Al 2O 3 catalyst, especially at a lower temperature. The conversion of C 2H 5OH is significantly suppressed by the existence of (CH 3) 2S 2 at a temperature lower than 300°C.