Journal of Advanced Chemical Engineering

Effective decomposition of greenhouse gas SF₆ via heavy-metal solid waste derived catalyst

Joint Event on World Chemistry, Catalysis & Petro Engineering

MAY 13-14, 2019 | LONDON, UK

Jia Zhang, Qiang Liu and Guangren Qian

Shanghai University, China

Scientific Tracks Abstracts: J Adv Chem Eng

Abstract:

Sulfur hexafluoride (SF6) is a refractory greenhouse gas. Catalytic decomposition of SF6 was seldom reported. In this work, we synthesized novel multimetal containing catalysts from heavy-metal solid wastes, and applied them in green catalytic decomposition of SF6 for the first time. As a result, the waste-derived catalysts, which mainly contained Cr, Cu and Fe oxides, remarkably removed SF6 at a capacity of 1.10m mol/g at 600oC. This active temperature was 100-200oC lower than that of phosphate catalyst, but much lower than 5000 K by electrical arc reported elsewhere. XRD analysis showed that the solid phase transformed from metal oxides (e.g. Fe2O3) to fluorides (e.g. FeF3) with the consumption of SiO2. At the same time, on-line FTIR analysis detected that the evolved gases were SO2 and SiF4, with no toxic SOF4, SO2F2 and SF4 being detected. These generated gases were readily captured by alkaline solution. According to the above results, the reaction between SF6 and SiO2 was catalysed by CrCuFe oxides in solid waste derived material, resulting in the green reduction of SF6. Furthermore, Stainless Steel Slag (SSS), another kind of multi-metal containing solid waste, also decomposed SF6 effectively at 600oC. By comparison, CaFeMgMn oxides in SSS catalysed the reaction between SF6 and SiO2. Therefore, our works exhibited that heavy-metal solid waste was a kind of potential resource for the synthesis of high-value added catalyst

Biography :

Jia Zhang is currently an Associated Professor in SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University. He also works in Shanghai Institute of Materials Genome. Dr Zhang’s research interest and expertise mainly focused on high-value-added utilization of hazardous solid waste. To this aim, he synthesized catalyst from heavy-metal containing waste, and applied it in various catalysis, including decomposition of greenhouse gas SF6, selective catalytic reduction of nitric oxide, catalytic oxidization of hydrogen sulfide, photocatalytic decomposition of organic waste and Fischer-Tropsch synthesis. Besides, he is working on CH4/ H2S conversion to H2 from landfill gas by heavy-metal containing waste-derived catalyst at present. Dr Zhang has authored/co-authored >20 journal publications in the areas of high-value-added utilization of hazardous solid waste.

E-mail: irujam@shu.edu.cn