摘要
浆态床甲醇合成过程具有重要的工业应用价值,影响该过程工业化的根本原因是催化剂易失活.以合成气为原料,医用液体石蜡为溶剂,在5MPa,260℃和1100ml/(g.h)的反应条件下于浆态床反应器中考察了铜基甲醇合成工业催化剂C301的稳定性,并采用程序升温还原、X射线衍射、透射电镜、扫描电镜、扫描电镜能谱、元素分析和N2物理吸附等表征方法对不同失活程度的催化剂的物相组成和形貌进行了表征.结果表明,在本实验条件下,失活催化剂无中毒现象,但随着反应时间的延长,催化剂晶粒长大,比表面积减小,积炭和热烧结现象较明显,但不伴随活性组分铜的流失.
Compared with the traditional gas phase synthesis, slurry-phase synthesis of methanol has many advantages. The bottle neck for the commercialization of slurry-phase methanol synthesis is the catalyst deactivation. In this paper, the stability and deactivation of a commercial Cu-based C301 catalyst for methanol synthesis from syngas with paraffin in a slurry phase were studied using a stirred autoclave reactor system. Synthesis reactions were conducted under the conditions of 5 MPa, 260 ℃, and 1 100 ml/（g·h）, and the reactions were lasted for different times to obtain catalyst samples with different deactivation degrees. The composition and morphology of the catalyst samples before and after reaction were characterized by means of temperature-pro- grammed reduction, X-ray diffraction, transmission electron microscopy, scanning electron microscopy-energy dispersive spectroscopy, elemental analysis, and N2 physical adsorption. The results showed that the deactivated catalyst was not poisoned by impurities in the reaction system. The main causes for the deactivation of the Cu-based catalyst were the sintering and carbon deposition. The Cu composition in the catalyst did not change significantly during the reaction.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第1期51-56,共6页
基金
中国科学院海外杰出学者基金(2005-2-4)
关键词
铜基催化剂
浆态床
催化剂失活
甲醇合成
稳定性
Cu-based catalyst
slurry-phase reactor
catalyst deactivation
methanol synthesis
stability
