▎ 摘　　要

NOVELTY - Regenerating metal particle mixtures comprises vacuum-washing metal particle mixture at 200-440° C under a pressure of 1-100 mbar, and performing hydrogen activation at 250-440° C. USE - The metal particle mixtures is useful for refining raw material for olefin metathesis. ADVANTAGE - The method: absorbs and removes catalyst poison-causing substances and impurities from raw materials e.g. natural oils and oil derivatives; recycles and reuses metal particle mixture; recycles water; maximizes the activity of the metathesis; is economical; has improved process efficiency. DETAILED DESCRIPTION - AN INDEPENDENT CLAIM is also included for purifying a raw material for olefin metathesis comprising (i) contacting the raw material for the olefin metathesis reaction with the metal particle mixture to purify the raw material for the olefin metathesis reaction, (ii) reactivating the metal particle mixture used in the purification step by vacuum washing and hydrogen activation treatment, and (iii) reusing the reactivated metal particle mixture for refining the raw material for olefin metathesis reaction, where metal particle mixture is in an unsupported state or in state in which a porous material is supported.