【摘要】 利用硝酸盐熔融法制备Co/Bi催化剂,用于催化湿法氧化(CWAO)处理垃圾渗滤液。对一次利用后的 Co/Bi催化剂进行回收和再生,在反应温度260 ℃、催化剂用量 2 g、氧分压 0. 5 MPa条件下,催化剂的回收率可达到(97. 09±0. 74)%。利用XRD、BET分析方法对新鲜制备、一次回收、一次再生、二次回收的催化剂进行表征,根据表征结果可知催化剂的活性为:新鲜制备>一次再生>二次回收>一次回收。利用上述催化剂在不同温度条件下降解垃圾渗滤液,在 280 ℃、300 ℃条件下,催化剂的活性为新鲜制备≈一次再生>一次回收,而在220 ℃、240 ℃、260 ℃条件下,则是新鲜制备>一次再生≈一次回收,表明低温条件下,一次再生的催化剂和一次回收的催化剂出现失活现象,并分析了催化剂失活的原因。更多还原

【Abstract】 The Co/Bi catalyst was prepared to deal with landfill leachates by melting Co(NO 3) 2·6H 2O and Bi(NO 3) 3·5H 2O with HNO 3(AR). Once used Co/Bi catalyst was recovered and regenerated, and the recovery ratio was (97.09±0.74)% after the reaction process (the temperature of 260 ℃, the catalyst dosage of 2 g, and oxygen partial pressure of 0.5 MPa). XRD and BET methods were employed to characterize the fresh, once used, once regenerated, and secondary recovered catalysts. BET and XRD information indicated that, for catalytic activity, fresh catalyst>once regenerated catalyst>secondary recovered catalyst>once reclaimed catalyst. The catalytic activity of the catalysts used is that fresh catalyst≈once regenerated catalyst>once used catalyst at the temperatures of 280 and 300 ℃ with a little difference of fresh catalyst>once regenerated catalyst≈once used catalyst at the temperatures of 220, 240, and 260 ℃, revealing that at the relative low temperature, the activity of once regenerated and once used catalysts was deactivated.更多还原