Catalytic Effect of Alkaline Earth Salt on the Oxidation Reaction of Char from Phenol-aldehyde Resin with Carbon Dioxide

Abstract

The catalytic effects of alkaline earth acetate on oxidation reaction between char made from phenol-aldehyde resin and carbon dioxide has been investigated by thermogravimetry and X-ray diffraction method.For examination of the catalytic activity of alkaline earth metal, thermogra-vimetric (TG) curves of mixture of char and alkaline earth acetate were measured at 10°C/min to 900°C in carbon dioxide, and weight decrease and rate of weight cderease of oxidation reaction were obtained from TG curves.As the results, it has been shown, the degree of weight decrease in the TG curves became larger in the following order, Calcium, Strontium and Barium acetate. The catalytic activity of Magnesium salt was recognized very little. As the concentration effect of these metal in the char, the degree of weight decrease by oxidation reaction on char became larger with increase of the concentration when the concentration of Calcium or Strontium metal was under 1% and that of Barium metal under 5%, while above these concentration the increase of weight decrease in each TG curves became negligible. And from the examination of the catalytic mechanism by the data of TG curves and X-ray diffraction in helium or carbon dioxide, it was suggested that alkaline earth metals repeat the cycle of oxide-carbonate.