双氧水催化氧化中Cu/γ-Al_2O_3催化剂的稳定性研究

Study on stability of CuO/γ-Al_2O_3 catalyst in catalytic wet hydrogen peroxide oxidation

针对废水湿式双氧水催化氧化,采用浸渍法制备Cu催化剂,研究非均相Cu催化剂在常温常压湿式双氧水催化氧化中的稳定性与失活问题。研究表明,催化剂制备条件及催化氧化反应条件对催化剂中Cu2+溶出均有影响。研究同时表明,催化剂失活与活性组分流失和活性组分被有机中间产物覆盖有关,高温焙烧可对催化剂再生。

CuO/γ-Al2O3 catalysts for the H2O2 wet oxidation of phenol are prepared by impregnating process.The stability and deactivation of heterogeneous Cu/γ-Al2O3 catalysts were studied at room temperature and atmospheric pressure in the catalytic wet hydrogen peroxide oxidation（CWPO）.Results showed that both the catalyst preparation conditions and the catalytic oxidation reaction conditions would affect the dissolution of the Cu2＋ active component.The catalyst deactivation was related with the loss of active components and the catalyst surface coverage by the oxidation intermediates.The catalyst can be regenerated by calcination at high-temperature.