微波诱导甲烷在活性炭/碳化硅上直接转化制C2烃

 在高功率脉冲微波辐照下甲烷可在常压条件下在活性炭/碳化硅和活性炭碳化硅等 三种催化剂上直接转化为C2烃。研究结果表明，当使用合适的微波作用条件时，微波加热与微波 等离子协同作用可使甲烷在多孔碳化硅担载的活性炭催化剂上以很高的转化率和选择性直接转化为乙炔，除单独的微波加热诱导作用和微波等离子催化作用外，转移反应机制可能是微波加热与微波等离子交互作用的具体表现形式，对促进甲烷向乙炔直接转化起了重要作用。

HIGH-POWER PULSED MICROWAVE INDUCED DIRECT CONVERSION OF METHANE TO C2 HYDROCARBONS OVER C/SiC

Basing on the comparison of microwave heating induced catalysis and microwave plasma catalysis, a novel method to obtain high yield of C 2 hydrocarbons from methane conversion was proposed. In this process, microwave heating and microwave induced plasma are combined in the same microwave applicator, and the high power pulsed microwave is used to heat active component supported by powder or monolithic support and induce plasma on the support surface simultaneously under atmospheric pressure. C/SiC catalyst was designed to meet this requirement. By this way, the limitations of independent microwave heating and microwave plasma induced methane conversion will be mostly overcome, the advantages of both processes, however, will be maintained. The optimized parameters of microwave pulse, 90% power, 1% duty and 20 s period, were confirmed through a great number of experiments. After irradiation of 400 microwave pulses with the best parameter, 65% yield of acetylene and 10% yield of ethylene have been obtained from direct conversion of methane over C/SiC catalyst. Comparing with the results obtained by use of high power pulsed microwave induced methane conversion over activated carbon powder and SiC powder respectively, it is believed that a synergetic catalysis of microwave heating microwave plasma exists in the above mentioned methane conversion process. Besides independent microwave heating induced methane conversion and microwave plasma induced methane conversion, transferring reaction, a specific manifestation of microwave heating microwave plasma interaction in synergetic catalysis, is a possible important mechanism to obtain the high yield of C 2 hydrocarbons from methane.