富二氧化碳合成气重整过程中的电流促进效应

针对生物质合成气中二氧化碳含量高的特点，将生物质稻壳炭用于重整富二氧化碳合成气的反应，降低合成气中二氧化碳的含量以满足合成气使用的要求。利用固定床反应器研究了生物质炭和二氧化碳反应过程中的电流促进效应，结果表明，提高电流能有效地提高富二氧化碳合成气重整过程中的CO2转化率，在电流为4 A和温度为800 ℃的条件下，CO2转化率可达到99.5%。通过时间飞行质谱仪检测到热电子在NiO/Al2O3催化剂表面诱发CO2解离形成的碎片峰；对电流引起的局部过热效应进行研究，结果表明电流效应是热电子促进和局部热效应共同作用的结果。

CURRENT PROMOTION EFFECT IN CO2-RICH BIO-SYNGAS REFORMING

Previous studies show that the CO2-rich syngas is harmful to Fischer Tropsch (FT) and alcohols synthesis in terms of conversion and yield. Therefore, the reduction of CO2 content in bio-syngas is essential before synthesis. A novel enhanced reforming process of the CO2-rich bio-syngas into CO-rich bio-syngas by adding electric current was investigated at atmospheric pressure using a mixture of rice husk char and NiO/Al2O3 catalyst. The current promotion effect was examined in temperature ranges from 400 to 800 ℃ and current ranges from 0 to 4 A. The results indicate that the promotion effect of current is remarkable. The CO2 in bio-syngas is almost completely converted (99.5%) into CO at 4 A and 800 ℃. The current promotion effect is attributed to the synergy of dissociation of CO2 on the surface of NiO/Al2O3 catalyst induced by the thermal electrons, proved by the measurement of TOF-MS (time of flight mass spectrometer) and local heat effect which is helpful to the conversion of CO2.