甲醇气相脱水制二甲醚的催化剂

Catalyst for dehydration of methanol to dimethyl ether

采用硝酸铝和氨水中和方法得到拟薄水铝石为原料,制备了甲醇制二甲醚催化剂。考察拟薄水铝石制备过程中的中和pH值、中和温度以及催化剂制备过程中的煅烧温度对甲醇气相脱水制二甲醚性能的影响。结果表明,当中和pH值在8.0±0.2、中和温度为50～60℃以及煅烧温度在550～600℃时得到的甲醇制二甲醚催化剂活性最高。通过在催化剂上添加SiO2、SO42、PO43等对甲醇脱水催化剂进行改性表明,改性后甲醇脱水催化剂活性有明显的提高。

Pseudo-boehmite was synthesized by neutralization of aluminium nitrate with ammonia water,and then used as the raw material to prepare the catalyst for dehydration of methanol to dimethyl ether.The precipitation pH,reaction temperature in the pseudo-boehmite synthesis process and calcination temperature in catalyst preparation that influenced the performance of catalyst in dehydration of methanol to dimethyl ether were investigated.The results indicated that at precipitation pH 8.0±0.2,reaction temperature 50～60 ℃,and calcination temperature 550～650 ℃,the catalyst had the best activity.Modifying the catalyst with SiO2,SO42,PO43 improved further catalytic activity.