摘要
用XRD,TD-DTG,TPR,N2吸附及N2O滴定法考察了铝盐的加入方式对CuO／znO／A12O3系催化剂前体及催化剂物相组成的影响;用加压微反评价装置考察了其对合成甲醇反应性能的影响。实验结果表明,铝盐的加入方式对催化剂前体物相组成及催化剂的反应活性有明显影响。Cu-Zn和Zn-Al分别沉淀有利于提高催化剂的低温活性;而Cu-Zn-Al三元共沉淀由于形成较多的类尖晶石相(Cu,Zn)Al2O4,降低了催化剂的低温反应活性,但提高了催化剂的热稳定性。保持催化剂中(Cu,Zn)Al2O4含量在适当水平对提高催化剂的整体性能至关重要。
Effect of Al salt addition methods on properties of CuO/ZnO/Al2O3 catalysts was studied by means of XRD,TG-DTG and TPR techniques. Catalytic activity of the prepared catalysts for methanol synthesis were tested in fixed-bed flow reactor. Al salt addition methods remarkably affected phase composition of catalyst precursors and the following catalysts, which led to different catalyties activities for methanol synthesis. In case of Cu-Zn,Zn-Al separate precipitation, the catalyst showed higher initial catalytic activity at low temperatures; while in Cu-Zn-Al ternary coprecipitation, the precursor was composed of higher content of hydrotalcite-like (Cu,Zn)6Al2 (OH)16 CO3·4H2O phase and resulted higher content of spinel - like phase (Cu,Zn)Al2O4 in catalyst, thus initial catalytic activity of catalyst at low temperatures slackened, but heat-stability of catalyst was strengthened.
出处
《石油化工》
CAS
CSCD
北大核心
2004年第11期1041-1045,共5页
Petrochemical Technology
关键词
氧化铜
氧化锌
三氧化二铝
催化剂
前体
铝盐
加入方式
甲醇
<Keyword>copper oxide
zinc oxide
alundum
catalysts
precursor
alumina salt
addition method
methanol
