改进型XC502低压甲醇合成催化剂的制备

The Study on the Preparation of a Modified Copper based Catalyst XC502 for Methanol Synthesis at Low Pressure

采用离子掺杂价态补偿原理及正交试验方法，在三组份Ｃｕ－Ｚｎ－Ａｌ低压甲醇合成催化剂中添加适量的ＩＶＢ族和ＶＢ族金属氧化物助剂，研制五组份多促进的Ｃｕ－Ｚｎ－Ａｌ－Ｍ１－Ｍ２的甲醇合成催化剂ＸＣ５０２．实验结果表明，在５．０ＭＰａ、２４０℃的条件下，ＸＣ５０２催化剂耐热前的活性比Ｃｕ－Ｚｎ－Ａｌ催化剂高约１０％，耐热后高约２９％；ＸＲＤ和ＤＴＡ表征显示，ＸＣ５０２催化剂前驱态含绿铜锌矿［（Ｃｕ，Ｚｎ）（ＯＨ）２（ＣＯ３）］和孔雀石［（Ｃｕ２（ＯＨ）２ＣＯ３］构型的组份较多，分散度较好．这与ＸＣ５０２型催化剂具有低温高活性和较好的热稳定性密切相关．

Based upon the principle of valency compensation and orthographic test method, a modified copper based catalyst XC502 by adding a small amount of IVB and VB groups metal oxide to traditional Cu Zn Al catalyst for methanol synthesis at low pressure has been investigated.The experimental results showed that under the reaction conditions of 5.0 MPa and 240 ℃, the catalytic activity for methanol synthesis over XC502 catalyst was about 10% higher than that of Cu Zn Al catalyst, and about 29% higher when a pretreatment of the catalyst XC502 was carried out at 400 ℃ for 3 h.By means of XRD and DTA methods, a comparative studies of the precursors of the two catalysts showed that the components of the aurichaicite and malachite in catalyst XC502 were found to be more than that in Cu Zn Al and the decomposed temperature of the XC502 precursor was 353 ℃.