Direct Chlorination of Carbon by Copper Chloride in a Thermal Process
时间：2009-04-06 阅读： 我要评论:
Abstract
A high concentration of chlorinated organic compounds such as dioxins, PCBs, and chlorobenzenes, etc., has been found in the fly ash of the postcombustion zone in a thermal process, i.e., waste incineration. The behavior of Cu and Cl in model fly ash was studied by using in situ X-ray absorption fine structure and diffraction technique using synchrotron radiation. Copper chloride changed its chemical state during rising temperature. These chemical states of copper played three types of roles: First, a two-step dechlorination at around 300 °C (the reduction of CuCl2 to CuCl) and 400 °C (the oxidation CuCl to CuO) and chlorination of the carbon matrix occurs. Chlorides from reduced copper chloride directly bonded aromatic or aliphatic carbon at the temperature that most of the chlorinated organic compounds formed. Second, catalyzed by CuO and CuCl, carbon gasification is promoted over 250 °C. Third, the formation of surface oxygen complexes may be catalyzed by CuCl at 300−350 °C. The control of copper may be important to reducing the formation of chlorinated organic compounds.
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