Catalytic activity of alkaline earth chlorides on the gasification of carbon by carbon dioxide. Importance of contact between catalyst and carbon.:Importance of Contact between Catalyst and Carbon

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In the gasification of phenol-formaldehyde resin char (PFC) added alka-line earth chlorides of Mg, Ca, Sr, and Ba as catalysts by carbon dioxide, the catalytic activ-ity measured by thermogravimetry (TG) was discussed in connection with the contact be-tween catalyst species and carbon and the chemical transformation of the catalyst in the gasification temperature range by means of contact angle measurement (CAM) and X-ray diffraction (XRD).<BR>According to temperature-programmed TG curves obtained, the catalytic activity se-quence was found to be Ca> Sr > Ba > Mg. This was different from the order Ba > Sr-Ca > Mg for carbonate and nitrate already reported. The catalytic mechanism of the chloride would be based on the cyclic raction of oxide-carbonate similarly to acetate from the result by XRD. But, the information of CAM indicated that the catalytic activity of chlorides was more greatly governed by the melting and wetting on PFC than the chemical change into the corresponding oxide and carbonate.
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