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Carbon dioxide as the final oxidation product of carbon and carbon containing compounds, whether it is from the comprehensive utilization of carbon resources, but also from environmental pollution control, the research and development of its transformation and utilization has a very important significance. In this paper, the microwave plasma body technology is applied to the conversion of carbon dioxide. H2/CO2 ratio, CO2 flow rate and microwave power on the influence of carbon dioxide conversion rate are studied. The results show that the CO2 conversion rate is 88.6% in the reaction conditions of H2/CO2 ratio 0.5 and CO2 volume flow 120ml/min and microwave power 120W. Microwave plasma technology for carbon dioxide conversion is a kind of green and effective method. Introduction Carbon dioxide in the atmosphere is increasing, although it is a greenhouse gas, the environment of human survival has caused the accumulation of the serious damage, but it is also a valuable C1 resources, if it can reasonably develop the use of CO2, not only to control environmental pollution, greenhouse effect, but also the comprehensive utilization of carbon resources are significant. However, CO2 is a stable compound, the focus of our research is on how to turn it into high value-added products. Plasma technology has been used in chemical reactions, such as the promotion, esterification, hydrolysis, oxidation and so on[1]. The technology is also applied in environmental management, waste gas treatment, sewage detection and solid waste. The use of radio frequency plasma technology for CO2 transformation has been reported[2-5], and this paper uses microwave plasma technology, through the microwave energy to stimulate the gas molecules group and generate plasma, activation and recombination into a new value of the compound, so as to achieve the purpose of CO2 transformation. Materials and Equipment Microwave plasma equipment (self made processing),Gas chromatograph (Shanghai Precision Scientific Instrument Co., ltd.), Rotor flow meter (Yuyao Yinhuan flowmeter Co. ltd.), Carbon dioxide (Wuhan heaven sent Gas Co., Ltd.), Hydrogen (Wuhan heaven sent Gas Co., Ltd.). Experiment Technology Schematic diagram of the process is shown in Figure 1. Microwave plasma equipment uses microwave to excite the thin gas discharge, which can produce plasma. The vacuum chamber is 50mm diameter quartz tube cavity, which are arranged at both ends of double water to cool down the protective sleeve. The vacuum system of the device adopts 2XZ-2 type rotary vane vacuum pump, and the mechanical pump and the vacuum chamber are provided with the electromagnetic valve and the high vacuum diaphragm valve, the bypass pipe is set up to the other valve to facilitate the operation safety of the vacuum system and the flexible control of the reaction gas pressure. 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology (MMECEB 2015) © 2016. The authors Published by Atlantis Press 570

Study on the Conversion of Carbon Dioxide by Microwave Plasma Technology