Application and research progress of iron-molybdenum catalysts for methanol oxidation to formaldehyde in fixed bed
To break through the"neck jamming"technology of iron-molybdenum formaldehyde catalysts and realize its localization and widespread application,the research progress of industrial application,laboratory preparation,reaction and deactivation mechanism of iron-molybdenum formaldehyde catalysts at home and abroad was reviewed.It is found that foreign iron-molybdenum formaldehyde catalysts achieve a formaldehyde yield of 93.3%after 70 years of industrial application and improvement,while domestic catalysts don't realize large-scale import substitution yet after industrial trials.Co-precipitation method is the mainstream method for preparing the catalyst,and the structure and performance of the catalyst will be affected by n(Mo)∶n(Fe),additives,precipitation temperature,pH value,stirring speed,aging time and calcination temperature.The reaction of methanol oxidation to formaldehyde on the catalyst followed redox mechanism,in which lattice oxygen plays a role of oxidizing active site,and the rate-determining step of the reaction is may be methoxy generation,methoxy dehydrogenation,or lattice oxygen transfer process,and the loss of molybdenum volatilization during reaction is an important reason for catalyst deactivation.It is pointed out that it's necessary at home to strengthen the research on iron-molybdenum formaldehyde catalysts formation mechanism,the influence law of preparation process on structure and performance of the catalyst,and the catalytic reaction and deactivation mechanism aimed at issues arising from industrial trials,so as to improve the catalyst performance,especially the catalyst stability.
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