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Study of using Waste Industrial Catalyst for the Removal of Harmful Organic Compounds  

Seo, Seong-Gyu (Department of Environmental Education, Mokpo National University)
Kim, Sang-Chai (Department of Civil & Engineering, Yosu National University)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.20, no.5, 2004 , pp. 663-670 More about this Journal
Abstract
The catalytic oxidation of benzene, toluene and xylene over a spent industrial catalyst (Pd-based) was investigated in a fixed bed flow reactor system. According to the priming condition, the properties of a spent Pd-based catalyst were characterized by XRD(X-ray diffraction). BET(Brunauer-Emmett-Teller) and ICP(Inductively coupled plasma). When air was used as a primer, optimum priming temperature was found to be 200$^{\circ}C$, and the catalytic activity decreased as the priming temperature increased. When a spent Pd-based catalyst primed with air at 200$^{\circ}C$ was re-treated with hydrogen at 200$^{\circ}C$, 300$^{\circ}C$ or 400$^{\circ}C$, respectively, the catalytic activity increased and thermal effect were negligible. $HNO_3$ aqueous solution priming resulted in slight decrease of the catalytic activity, with little effects on $HNO_3$ concentrations. The activity of a spent Pd-based catalyst with respect to VOC molecule was observed to follow sequence: xylene> toluene> benzene. Benzene. toluene and xylene could be removed to almost 100% by a spent Pd-based catalyst primed with hydrogen.
Keywords
Spent industrial catalyst; Catalytic oxidation; Priming; Benzene; Toluene; Xylene;
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