Performance Characterization of Vanadium Catalysts During Thermal Inactivation
[Purposes]The change of pore size of vanadium catalyst during thermal deactivation was ana-lyzed,and the conversion rate and activity change trend of SO2 to SO3 at 410 ℃,440 ℃,480 ℃ and 520 ℃ were analyzed,and the change of microstructure was analyzed.[Methods]Through the heat resis-tance test of vanadium catalyst,the microscopic surface structure change process of thermally deacti-vated vanadium catalyst was observed by SEM scanning electron microscope,and the pore size analysis and conversion activity detection of vanadium catalyst in the process of thermal deactivation were carried out.[Findings]With the thermal deactivation process,the pore size of the vanadium catalyst obviously moved to the large pore direction,and the conversion rate of the vanadium catalyst gradually decreased.In the test temperature range,the activity decay rate of the catalyst generally shows a trend from slow to fast.When the test temperature is 410 ℃,480 ℃,and 520 ℃,the activity decay rate decreases first and then increases.At 440 ℃,the activity decay rate increases with the increase of thermal deactivation pro-cess.[Conclusions]With the increase of heat resistance time,the thermal deactivation phenomenon is obvious,and the pore size moves to the macropore direction.During the use of vanadium catalyst,the gas diffusion rate changes,and the conversion rate decreases,resulting in a significant decrease in the activ-ity of vanadium catalyst.The active components and metal promoters are gradually melted during the heat-resistant process,resulting in a shorter service life of the vanadium catalyst.
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