铜基催化剂上富二氧化碳合成气制甲醇的研究

Study on the synthesis of methanol from CO_2-rich synthesis gas over a copper-based catalyst

采用两步共沉淀法制备了一种铜基催化剂,在微反装置上评价了反应条件对其催化富CO2合成气合成甲醇反应的影响。结果表明,随温度升高,CO转化率和甲醇时空收率都出现一个极大值,而CO2转化率呈上升趋势;在实验允许的范围内,增大压力是提高CO和CO2转化率和甲醇时空收率的有效手段;提高原料入塔气中H2含量,可提高CO和CO2的转化率,但甲醇时空收率下降;提高空速,可提高甲醇时空收率,但CO和CO2转化率下降。

A Cu-based catalyst was prepared by two-step co-precipitation, and the effects of reaction conditions on the synthesis of methanol from CO_-rich synthesis gas over this catalyst were investigated on a fixed-bed microreaetor. The results showed that with the increase of reaction temperature, both of methanol space-time yield and carbon monoxide conversion passed through a maximum value, but carbon dioxide conversion increased continuously; increasing pressure was efficient to improve carbon dioxide conversion and methanol space-time yield; increasing the hydrogenation concentration in feed gas could improve both of carbon monoxide and carbon dioxide conversion, but decrease the space-time yield of methanol, and the effect of space velocity was reverse.