In case catalyst poisons, such as organic silicone and phosphorus, exist in exhaust gas stream, installation of guard bed catalyst may extend catalyst life. Since guard bed catalyst cannot remove catalyst poisons physically, however catalyst poisons will gradually accumulate on surface of the catalyst.

Our chemical rejuvenation is suitable to recover catalyst performance from the poisoned catalysts by organic silicon and phosphorous. Chemical rejuvenation is workable for only catalyst poison of organic silicon, phosphorous, etc. which formed nonvolatile oxides on the active metals on catalyst. On the other hand, the catalysts rejuvenated by several times or catalysts exposed to thermal sintering are not fully recovered their catalyst performance.

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