알루미나에 담지된 귀금속 촉매에 의한 공기 중의 dimethyl methylphosphonate(DMMP) 분해에 대하여 고정층 연속식 반응기를 이용하여 연구를 수행한 결과 여러 귀금속 중에서 백금이 담지된 촉매가 가장 우수한 성능을 보였다. 모든 촉매의 경우 반응초기에는 분해율이 100%에 이르는 좋은 성능을 보였지만 시간이 경과함에 따라 성능이 급격하게 저하되었으므로 반응 생성물과 촉매의 표면 분석을 통하여 촉매상에서의 DMMP 분해 및 촉매의 활성저하 메카니즘을 밝히고자 하였다. 실험결과 DMMP의 메톡시기가 담체인 알루미나의 가수분해 작용에 의하여 먼저 떨어져 나오고 떨어져 나온 메탄올은 귀금 속의 산화작용에 의하여 이산화탄소와 물로 분해되는 과정을 거치게된다. 인이 포함된 분해화학종은 대부분 비휘발성의monomethyl methylphosphonate(MMMP)
와 methylphosphonic acid(MPA)이며 이들 중 일부가 촉매 표면에 강하게 고정되어 촉매 표면의 활성을 저하시키는 작용을 하였다.

The catalytic decomposition of vaporized dimethyl methylphosphonate(DMMP) by alumina-sup-ported precious metal catalysts was studied with a fixed bed flow reactor. The platinum catalyst showed the best performance for the reaction. DMMP vapor in air stream was decomposed perfectly at the beginning but the performances of the catalysts were reduced rapidly with the lapse of time. So we tried to elucidate the decomposition mechanism of DMMP and the deactivation mechanism of the catalysts in process of reaction by analyzing the reaction products and the surfaces of the catalysts. According to the test results, methoxy groups of DMMP were separated by hydrolysis reaction over the alumina support, and the methanol formed from the methoxy groups was decomposed to carbon dioxide and water by oxidation reaction over the precious metals. The decomposed chemicals containing phosphorous were mainly nonvolatile monomethyl methylphosphonate(MMMP) and methyphosphonic acid(MPA). A part of the nonvolatile products adhered strongly to the surfaces of the catalysts, so the catalysts were deactivated seriously.

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