Non-Thermal Plasma-Modified Ru-Sn-Ti Catalyst for Chlorinated Volatile Organic Compound Degradation

Abstract

Chlorinated volatile organic compounds (CVOCs) are vital environmental concerns due to their low biodegradability and long-term persistence. Catalytic combustion technology is one of the more commonly used technologies for the treatment of CVOCs. Catalysts with high low-temperature activity, superior selectivity of non-toxic products, and resistance to chlorine poisoning are desirable. Here we adopted a plasma treatment method to synthesize a tin-doped titania loaded with ruthenium dioxide (RuO2) catalyst, possessing enhanced activity (T90%, the temperature at which 90% of dichloromethane (DCM) is decomposed, is 262 °C) compared to the catalyst prepared by the conventional calcination method. As revealed by transmission electron microscopy, X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, and hydrogen temperature-programmed reduction, the high surface area of the tin-doped titania catalyst and the enhanced dispersion and surface oxidation of RuO2 induced by plasma treatment were found to be the main factors determining excellent catalytic activities.

A review of the advances in catalyst modification using nonthermal plasma: Process, Mechanism and Applications

“…Correspondingly, the T 90 of toluene abatement decreased from 287 o C to 208℃, compared with the calcination method [109]. Fu et al [110] reported that the Ru-Sn-Ti catalyst was treated with O 2 plasma, achieving a higher dichloromethane (DCM) degradation activity (T 90 : 262°C) in contrast to a T 90 of 299 o C using the calcination method. It was revealed that the higher surface area, the enhanced dispersion of RuO 2 and surface oxidation of RuO 2 induced by O 2 plasma treatment were found to be the main factors determining excellent catalytic activities.…”

Towards Catalysts Prepared by Cold Plasma

“…In this way, Fu et al [11] produced a RuO 2 /Sn 0.2 Ti 0.8 O 2 catalyst for chlorinated volatile organic compound degradation. They found that the plasma treatment was the main factor that determined the excellent improvement of catalytic efficiency compared to the catalyst produced via conventional calcination.…”