改进型铜基甲醇合成催化剂NC208的DTA研究

对改进型铜基催化剂进行了研究，活性评价结果表明，改进型铜基甲醇合成催化剂ＮＣ２０８（Ｃｕ－Ｚｎ－Ａｌ－Ｍ１２）初始活性比工业催化剂Ｃ２０７（Ｃｕ－Ｚｎ－Ａｌ）提高约１８％；耐热试验后比Ｃ２０７提高约４６％。两种催化剂的ＤＴＡ对比试验显示，工作态ＮＣ２０８催化剂热稳定性明显优于Ｃ２０７；ＮＣ２０８催化剂前驱体含Ｃｕ（ＮＯ３）２·３Ｃｕ（ＯＨ）２、Ｚｎ５（ＯＨ）６（ＣＯ３）２和（ＣｕＺｎ）（ＯＨ）２ＣＯ３等成分比Ｃ２０７多，其分解温度小于３５０℃；ＮＣ２０８催化剂还原最高温度为２３５℃。

DTA study on NC208 modified Cu based catalyst for methanol synthesis

A study is carried out on NC208 modified Cu based catalyst, prepared by adding small amount of MO x to the commercial C207 catalyst, for methanol synthesis. The experimental results show that the activities of NC208 (Cu Zn Al M 12 ) are about 18% higher initially in methanol synthesis at 5.0 MPa and 250℃ and about 46% higher after a heat treatment at 400℃ for 3h than those of C207 (Cu Zn Al), respectively. In DTA comparative tests on both, the two catalysts show that the heat stability of NC208 is obviously better than that of C207. The precipitates in the NC208 system contain more Cu(NO 3) 2·3Cu(OH) 2, Zn 5(OH) 6(CO 3) 2 and (CuZn)(OH) 2CO 3 than those in the C207 system. All those three compounds decompose at a temperature lower than 350℃. The highest reduction temperature of NC208 is 235℃.