STUDY OF THE DESULFURIZATION MECHANISM BY DINUCLEAR COBALT-PHTHALOCYANINE SULFONATE (PDS) CATALYST Ⅱ.THE MECHANISM AND DYNAMICS OF DESULFURIZATION
Yang, Shu-qing;Chen, Bin; Du, Xi-guang; Shao,Yun; Zhao, Yong-liang and Zhao,Cheng-da(Department of Chemistry, Northeastern Normal University, Changchun 130024)
The mechanism and dynamics of the desulfurization with PDS catalyst were discussed. The results suggested that the desulfurizing process was a free radical mechanism. In which the electron transfer between oxygen and the fifth ligands, such as HS-,OH-, NH3 etc, set off by the coordinated center Co(Ⅱ) of PDS was the rate-controlling step. The reaction was first order with respect to PDS and HS- concentrations as well as the oxygen pressure. The activation energy of this reaction was 43.23kJ/ mol. The optimum conditions for desulfurization were found as follows: the PDS concentration 0.543-2.713 mmol/m3, the temperature≈308 K and the pH value of washing solution≈8.2.