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CO_2还原是长期载人航天中生命保障系统的关键技术,针对作为CO_2还原系统核心的反应器及其中的催化剂的效率问题,在耦合原料气预热的Sabatier固定床反应器和Ru/Al2O_3催化剂上,在宽范围的原料气氢碳比(1∶1~5∶1)和流量(2~8 L/min)工况下,进行了Sabatier反应拉偏试验,结果表明:反应的起动温度为150℃,在不同原料气流量和氢碳比下,反应器温度梯度分布合理,贫组分的转化率达到98%以上(氢碳比4∶1除外)。耦合原料气预热的Sabatier固定床反应器结构合理,Ru/Al2O_3催化剂活性高,能够高效处理舱室中2~4人的代谢量。
CO 2 reduction is the key technology of life support system in long-term manned spacecraft. Considering the efficiency of the reactor and its catalyst which are the core of the CO 2 reduction system, on the Sabatier fixed bed reactor and Ru / Al 2 O 3 catalyst , The Sabatier reaction pull-off test was carried out under a wide range of feed gas (1: 1 ~ 5: 1) and flow rate (2 ~ 8 L / min). The results showed that the starting temperature of the reaction was 150 ℃, the temperature gradient of the reactor is reasonable under the different feed gas flow rate and hydrogen-carbon ratio, and the conversion rate of lean components reaches more than 98% (except hydrogen-carbon ratio 4: 1). The coupled Sabatier fixed-bed reactor with preheated feed gas has reasonable structure and high catalytic activity of Ru / Al 2 O 3 catalyst, which can effectively handle the metabolic capacity of 2 to 4 persons in the chamber.