Several definitions of catalysts
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Definitions of catalyst coking, activation, and sulfidation
During operation, coke forms on the surface of the catalyst and within its pores, which affects its performance; therefore, coking treatment is necessary to restore the catalyst’s activity. Due to processes such as loading, the catalyst inevitably comes into contact with air, and some catalysts can catch fire when exposed to oxygen. To prevent this, these catalysts are passivated during production. After being loaded into the reactor, the catalysts need to be activated in order to regain their activity