| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalytic combustion type purification technique by which the purification of organic silicon-containing exhaust gas can be kept at a low cost for a long time at a high purification rate. <P>SOLUTION: In an alternately-operated heat accumulating catalytic combustion apparatus (shown in the figure) a catalyst 3 on the low temperature side and the catalyst 5 on the high temperature side, the performance of each of which is deteriorated by an organic silicon compound, are drawn out from catalyst layers respectively and exchanged for each other. The exhaust gas containing a volatile organic compound and silicon is led to a distribution valve 1 and made to flow to the black or white arrow directions by switching it periodically. In the case of the black arrow the exhaust gas is led to noble metal-deposited catalysts 3 and 5 from a heat accumulating material 2 and purified oxidatively and the purified exhaust gas is made to pass through another heat accumulating material 4 and the valve 1 and discharged to the outside. In the case of the white arrow the exhaust gas is treated in the same manner. As a result, the deteriorated catalyst can be regenerated easily, the exchange time of the expensive catalyst can be extended drastically and the running cost can be reduced. <P>COPYRIGHT: (C)2004,JPO |
