烟气体系下CO2与CH4重整反应的研究

使用以α-Al2O3和γ-Al2O3为载体的改性Ni负载型催化剂，在连续流动式固定床反应上评价了CO2-CH4-O2-He转化制合成气的性能。结果表明，在常压、500～700 ℃的温度范围以及原料中CO2体积分数为15%的条件下，反应温度越高，2种催化剂上反应生成的合成气的体积分数越大，但α-Al2O3基催化剂具有更高的活性和生成合成气的选择性；使用α-Al2O3催化剂时，临氧条件比非临氧条件更有利于合成气的生成，O2体积分数越高越有利于合成气的生成； CO2与CH4体积比越小越利于合成气的生成和CO2的转化；α-Al2O3基催化剂具有良好的再生性能。当CO2与CH4体积比为3：4，O2体积分数为2.5%，反应温度700 ℃，常压下反应尾气中合成气的体积分数可达83.8%，CO2的转化率可达95%。

INVESTIGATION OF CARBON DIOXIDE AND METHANE REFORMING REACTION IN FLUE GAS SYSTEM

The reforming of CO2, CH4, O2 and He mixture system to syngas was investigated in a continuous flowing fixed-bed reactor. The modified nickel catalysts supported on α-Al2O3 and γ-Al2O3, respectively were used in the reaction. It is found that the volume fraction of syngas obtained increased with the rise of temperature at 500 ℃ to 700 ℃, atmospheric pressure, and the 15% volume fraction of CO2 in feed gas. Compared with γ-Al2O3 supported catalyst, α-Al2O3 supported catalyst possesses a higher activity and selectivity. When α-Al2O3 supported catalyst was used, the presence of oxygen in feed gas promotes the production of syngas and the volume fractions of syngas increase as the volume fraction of O2 increases. Moreover, a lower volume ratio of CO2 to CH4 is conductive to the production of syngas and the conversion of CO2. α-Al2O3 supported catalyst possesses good regenerability. When the volume ratio of CO2 to CH4 is 3:：4 and the volume fraction of O2 is 2.5% in the feed gas, the volume fraction of syngas in product gas reaches 83.82% and the conversion of CO2 is up to 95.05% at atmospheric pressure and 700 ℃.