摘要
选择Cu/Zn/Al_2O_3和拟薄水铝石,同时添加助剂,采用挤条法成型合成气一步法制备二甲醚的双功能催化剂,通过对催化剂进行强度测试、表征和性能评价,确定了最佳的催化剂制备条件为:Cu/Zn/Al_2O_3与拟薄水铝质量比1∶1,胶溶剂硝酸质量分数为4%,助挤剂质量分数柠檬酸为5%、田菁粉为2.5%,用水量与原料粉体的质量比为0.60。在此条件下制备的催化剂,其强度可达153N/cm,在250℃、3MPa、2500m L/(g·h)的条件下,催化剂CO转化率为79.8%,二甲醚的选择性为49.1%,甲醇的选择性为15.2%。
The Cu/Zn/Al2O3 was mixed with pseudo boehmite and extrusion assistants to prepare the shaped bi-functional catalyst for one-step synthesis of dimethyl ether from syngas by extrusion. Through strength measurement, characterization and activity tests of the shaped catalysts, the optimal extrusion shaping conditions were determined as follows： mass ratio of Cu/Zn/Al2O3 to pseudo hoehmite of 1 ： 1, peptizer （HNO3） mass fraction of 4%, lubricants citric acid and sesbaria cannabina powder of 5% and 2.5%, respectively, and mass ratio of water to solid material of 0.60. The catalyst shaped at the optimized conditions had a strength of about 153N/cm, and over it, under 250℃, 3MPa and GHSV of 1500mL/（g-h）, CO conversion was 79.8% with a DME selectivity of 49.1% and a methanol selectivity of 15.2%.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2016年第6期1-6,共6页
Natural Gas Chemical Industry
基金
国家科技支撑计划项目(2007BAA08B04)
关键词
合成气
二甲醚
双功能催化剂
挤条成型
syngas
dimethyl ether
hi-functional catalyst
extsruion shaping
