制备方法对钼基耐硫甲烷化催化剂性能的影响

发布时间：2019-01-06 13:18

【摘要】：合成气甲烷化是煤制天然气工艺的主要过程之一。与传统的镍基催化剂相比,钼基催化剂用于耐硫甲烷化可以省去精脱硫过程和水汽变换过程,具有一定的技术和成本优势。但是钼基催化剂活性相对较低,尤其是低温活性和高温稳定性有待提高。对比研究不同方法制备的MoO_3/ZrO_2催化剂在固定床反应器上的耐硫甲烷化性能,发现采用溶液燃烧法制备的催化剂在相同条件下具有较高的耐硫甲烷化活性,当空速为5000 h~(-1)、反应压力为3MPa、反应温度为300℃和400℃时其CO转化率可分别达到26%和79%。催化剂的N_2物理吸附、透射电镜、X射线衍射和Raman光谱等表征结果表明,溶液燃烧法制备的催化剂具有较小的ZrO_2晶粒尺寸和较大的比表面积,活性组分Mo物种在ZrO_2载体上的分散性更好。而采用共沉淀法和浸渍法制得的MoO_3/ZrO_2催化剂存在不同程度的Mo物种团聚现象,导致其耐硫甲烷化活性较低。
[Abstract]:The methanation of syngas is one of the main processes in the process of producing natural gas from coal. Compared with the traditional nickel based catalysts, molybdenum based catalysts can eliminate the refined desulfurization process and water vapor shift process in methanation of sulfur tolerance, which has certain technical and cost advantages. But the activity of molybdenum based catalyst is relatively low, especially the low temperature activity and high temperature stability need to be improved. The methanation resistance of MoO_3/ZrO_2 catalyst prepared by different methods in fixed bed reactor was studied. It was found that the catalyst prepared by solution combustion method had higher methanation activity under the same conditions. When the space velocity is 5000 h ~ (-1), the reaction pressure is 3 MPA and the reaction temperature is 300 鈩，

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