直接合成二甲醚催化剂Cu-Zn-Al-Fe/HZSM-5的研究

采用水热法合成Cu-Zn-Al-Fe催化剂,使用HZSM-5作载体,考察了硝酸盐溶液浓度、老化温度、Fe含量对催化剂的影响.对制备的催化剂进行了SEM,BET,FT-IR和XRD检测.在4MPa,260℃,H2和CO2体积分数比为3的条件下,由二氧化碳加氢直接合成二甲醚(DME).结果表明:硝酸盐质量分数为10%,老化温度为150℃时制备的催化剂粒径最小,约500 nm,比表面积达200.6m2/g.在Fe的质量分数为5%时CO2的转化率达41.4%,DME的选择性达45.2%.

Cu-Zn-Al-Fe/HZSM-5 Catalyst for Direct Synthesis of Dimethyl Ether

Cu-Zn-Al-Fe catalyst was prepared by the hydrothermal method,using HZSM-5 as a support.The influence of nitrate content,aging temperature and Fe content on the catalyst was investigated.SEM,BET,FT-IR and XRD were applied to the characterization of the catalyst.Dimethyl ether(DME) was synthesized by feeding CO2 and H2 into a reactor under the pressure of 4 MPa,the temperature of 260 ℃ and the H2/CO2 ratio(volume fraction) of 3.The results showed that when the mass fraction of nitrate is 10% and the aging temperature is 150 ℃,the particle size of the catalyst is the minimum(about 500 nm) and the specific surface area is 200.6 m2/g.During synthesizing DME,the catalyst with 5%Fe shows the best effect,with CO2 conversion ratio of 41.4% and DME selectivity of 45.2% obtained.