Comparative analysis of deactivation causes of two industrial methanol synthesis catalysts
The deactivation of methanol synthesis catalysts is one of the important factors leading to the shutdown of methanol synthesis units,which seriously affects the economic benefits of production enterprises.Characterization analysis was conducted on catalyst samples from two methanol factories to investigate the reasons for their deactivation,including X-ray fluorescence spectroscopy,X-ray diffraction,infrared spectroscopy,physical adsorption and inductively coupled plasma emission spectroscopy.The results show that after about two years of industrial use,the catalysts exhibite phenomena such as decreased radial strength,pulverization,increased copper grain size,decreased specific surface area and enrichment of harmful impurity elements(sulfur and iron).The maximum grain size of copper in the deactivated catalyst can reach 32.72 nm,and the corresponding specific surface area decreases from 102.3 m2/g to the lowest 16.0 m2/g.The sulfur and iron contents(mass fraction)increase from less than 0.05%and 362×10-6 to the highest 0.36%and 2629×10-6,respectively.The catalysts collected from two factories exhibit different deactivation characteristics,and targeted measures need to be taken to extend the service life of the catalysts.
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