摘要
围绕6种国内外不同型号的工业甲醇合成催化剂(分别标记为GX、Z、CM、T、GH和D)进行了实验室合成气制甲醇催化性能评价,并与其中3种催化剂的工业应用数据进行了对比。考察了催化剂的甲醇时空收率、粗甲醇产物中主要杂质乙醇含量和催化剂热稳定性;采用N_(2)吸/脱附、N_(2)O分解、XRD、H2-TPR、H2-TPD、CO-TPD、XPS分析了催化剂的“构效关系”。结果表明,催化剂T和GH具有较高的甲醇时空收率,其中T的热稳定性最好(可达99.4%);催化剂GX拥有较高的抑制杂质乙醇生成的性能,乙醇质量分数可以控制在1.05×10^(-3)。还原态催化剂活性Cu比表面积的提高利于提高甲醇合成催化剂甲醇的时空收率;催化剂表面Zn的适当富集能够抑制杂质乙醇的生成;催化剂优良的热稳定性与还原态催化剂表面CO主要吸附位的均匀性有关。
The catalytic performance of six different types of industrial methanol synthesis catalysts(labeled as GX,Z,CM,T,GH and D,respectively)at home and abroad for synthesis gas to methanol were evaluated in laboratory,and compared with the industrial application data of three catalysts.The space-time yield(STY)of methanol,the main impurity ethanol content in the crude methanol product and the thermal stability of the catalyst were investigated.The"structure-performance relationship"of the catalyst was analyzed by N_(2)adsorption/desorption,N_(2)O decomposition,XRD,H2-TPR,H2-TPD,CO-TPD and XPS.The results show that the catalysts T and GH have higher STY of methanol compared with others catalysts,and T has the best thermal stability(up to 99.4%).The GX behaved much better on restraining the formation of impurity ethanol,and the mass fraction of ethanol can be controlled at 1.05×10^(-3) in the crude methanol.The increase of Cu active surface area of the reduced catalyst is beneficial to increasing STY of methanol of the catalyst.The appropriate enrichment of Zn on the catalyst surface can inhibit the formation of impurity ethanol.The excellent thermal stability of the catalyst is related to the uniformity of the major adsorption sites of CO on the reduced catalyst surface.
作者
李忠于
LI Zhong-yu(SINOPEC Research Institute of Nanjing Chemical Industry Co.,Ltd.,Nanjing 210048,Jiangsu,China)
出处
《天然气化工—C1化学与化工》
CAS
北大核心
2021年第2期31-38,共8页
Natural Gas Chemical Industry
基金
中国石化重点项目(419022-4)。
