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以LaFeO3为载体,通过Fe(OH)3对载体进行改性,采用沉积沉淀法制备纳米金催化剂,并对催化剂进行XRD、XPS、AAS和BET测试,考察催化剂的活性和稳定性。结果显示,Fe(OH)3助剂的加入,对催化剂的活性提高不明显,但大大提高了催化剂在反应过程和放置过程中的稳定性。加入助剂的Au/Fe(OH)3/LaFeO3催化剂,由于Fe(OH)3和活性组分的相互作用,减缓了金颗粒的聚集,使得放置近半年的催化剂和新鲜催化剂具有相近的活性和稳定性。
The LaFeO3 was used as carrier to modify the support by Fe (OH) 3. The gold nanoparticles were prepared by deposition precipitation method. The catalysts were characterized by XRD, XPS, AAS and BET. The activity and stability of the catalysts were investigated. The results showed that the addition of Fe (OH) 3 promoter did not obviously improve the activity of the catalyst, but greatly enhanced the stability of the catalyst during the reaction and placement. The addition of Au / Fe (OH) 3 / LaFeO3 catalyst slows down the aggregation of gold particles due to the interaction between Fe (OH) 3 and the active components, which makes the catalyst and fresh catalyst that have been placed nearly half a year have similar activities stability.