摘要
铝元素是Cu/ZnO/Al_2O_3合成甲醇催化剂的重要组成部分,本文研究了不同铝添加方式对Cu/ZnO/Al_2O_3催化剂性能的影响.实验采用一步共沉淀法和分步沉淀法,制备了一系列不同含铝前驱体组成的催化剂样品,通过X射线衍射(XRD)、热重-质谱(TG-MS)、荧光光谱仪(XRF)、N2物理吸附、程序升温还原实验(TPR)和X射线光电子能谱(XPS)对这些样品进行了表征.结果表明,铝添加方式对样品碱式碳酸盐晶体中的Cu-Zn取代程度产生影响,进而影响到催化剂的性能.以氢氧化铝为含铝前驱体的催化剂表现出相对较高的Cu-Zn取代率,同时前驱体含有相对较多的类孔雀石相和绿铜锌矿相.结果表明,以氢氧化铝为含铝前驱体的催化剂的活性和稳定性均优于共沉淀法制备的催化剂.以氢氧化铝为含铝前驱体更适于制备Cu/ZnO/Al_2O_3合成甲醇催化剂.
Aluminum is an important ingredient in the ternary Cu/ZnO/Al2O3 catalyst for methanol synthesis from syngas. The objective of this work is to investigate the effect of AI addition methods on the property of Cu/ZnO/Al2O3 catalyst. A series of Cu0.6Zn0.3Al0.l catalysts with various Al-containing precursors were prepared by co-precipitation and fractional-precipitation methods. The catalyst samples were characterized by XRD, TG-MS, XRF, N2 physisorption and TPR. Results show that the Al addition methods have strong effect on the substitution of Cu by Zn in the subcarbonate lattice, leading to various performances of the obtained catalysts. A1 addition with fractional precipitation performed higher substitution of Cu than that with the traditional co-precipitation method. And thus, it can be a promising method for preparing the Cu/ZnO/Al2O3 methanol synthesis catalyst.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2017年第11期1326-1334,共9页
SCIENTIA SINICA Chimica
关键词
碱式碳酸盐
分步沉淀
类水滑石
Cu-Zn取代
类孔雀石
subcarbonates, fractional precipitation, hydrotalcite-like compounds, Cu-Zn substitution, rosasite
