微波等离子体甲烷转化反应中积炭的形成及其与氢气的反应

Polymeric Deposit and Its Reactivity with hydrogen in Microwave Plasma of Methane

考察了微波等离子体甲烷转化反应中积炭的形成条件。积炭的形成主要是由于微波功率增大导致了甲烷深度脱氢自由基CH、C原子和C2物种的相对数量增多。这些深度脱氢物种的增多能够提高C2烃中乙炔的生成选择性，但也容易通过多聚形成积炭。积炭能够与氢气等离子体反应转化成甲烷和乙炔。积炭在组成上可以看作是乙炔和乙烯的多聚物，因为积炭的H／C比例在1．4～1．5附近。

Formation of polymeric deposit was investigated in methane conversion by microwave plasma. The increase of the deeply dehydrogenated radical CH, C atom and C2 species at high microwave power level was ascribed to the polymeric deposit. The increase of radical CH and C atom also enhanced acetylene selectivity in C2 product. A part of polymeric deposit can be reconverted into methane and acetylene by hydrogen plasma. The polymeric deposit was presumed to be formed via polymerizing of acetylene and ethylene or related radicals because the H/C atom ratio of it is 1.4-1.5.