The choice of reduction condition in industrial reactor

In industrial devices, although the reduction rate should be considered because it relates to the time of non-production of enterprises, more importantly, it is the key factor to ensure the quahty of catalyst, that is, to ensme that all the catalyst are reduced thoroughly and the activity of reduced catalyst is not lost, because it is not involved in the present several hours or tens horns of non-production time, but the economic interest and production time of the whole catalyst of reactor for the next several years or even more than 10 years. 

For industrial devices, the most important part is not the rate, but the quality of reduction. The first consideration for the choice of reduction conditions is to ensure the quality, not the rate. The key factor for the reduction quality is temperature and water vapor concentration. Both of them will directly affect the a-Fe crystallite size, surface area size and activity level of the catalyst. The reduction rate is not indicated by the reduction time, but by the level of water vapor concentration, and this is the only criterion to control the rate of reduction. 

Therefore, for the choice of reduction conditions of catalyst in industrial devices, it is necessary to consider thermodynamics and the dynamics as well as the technology and the equipments which can provide suitable conditions. It is necessary to consider reducing speed and time as well as to ensure the reduction quality and activity of the catalyst. And all these cannot ignore the requirements of performance of catalysts. 

the reduction of ZA-5 or A301 type Fei xO-based catalysts which have extremely easy reduction properties are restricted by conditions of present process 

Catalysts Initial temp./°C Final temp. /°C Temp, with the fastest rate/°C Reduction degree R/% Time with 85% reduction degree/min Reduction rate/ relative Weight of H2O/ (kg-fi) 

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