Surface modification of Fe/MCSAC catalysts with coaxial cylinder dielectric barrier discharge plasma for low-temperature catalytic hydrolysis of CS2

•The catalytic activity of Fe/MCSAC could be enhanced after NH3 NTP modification.•K species and NH2− act as co-catalysts, which could promote the hydrolysis of CS2.•The abundance of oxygen-containing groups block the CS2 adsorption sites.•More acidic functional groups (-COOH) were unfavourable to the hydrolysis of CS2.

The removal performances of carbon disulphide (CS2) from gas streams over microwave coconut shell activated carbon (MCSAC) supported Fe (Fe/MCSAC) modified by a dielectric barrier discharge (DBD) non-thermal plasma (NTP) were investigated. The properties of Fe/MCSAC catalysts modified by NTP in different conditions, including the reactor structures, modification atmospheres, input voltages, treatment times and discharge intervals, were also studied. A study of the catalytic activities showed that Fe/MCSAC catalysts with NTP modification better catalytically hydrolyse CS2, and the optimal reactor type, modification atmosphere, input voltage and treatment time were a coaxial cylinder, an NH3 atmosphere, 20 V, 10 min and 2 mm, respectively. Temperature programmed desorption of CO (CO-TPD), X-ray photoelectron spectroscopy (XPS), Brunauer Emmett Teller (BET), theoretical calculation and Fourier transform infrared spectrum (FT-IR) analysis methods, which were designed to understand the effect of the plasma treatment and the hydrolysis mechanism of CS2. The catalytic activity could be enhanced effectively by improving the dispersion of the active components and increasing the number of oxygen-containing groups and potassium-containing groups after NTP modification. The investigation indicated that NTP treatment is an effective way to manipulate the catalyst surface properties for the CS2 catalytic hydrolysis reaction.

Graphical abstractNTP treatment is an effective way to manipulate the catalyst surface properties for the CS2 catalytic hydrolysis reaction.Download high-res image (100KB)Download full-size image