Yang M, Sun Y, Xu A H, Lu X Y, Du H Z, Sun C L, Li C
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.
Bull Environ Contam Toxicol. 2007 Jul;79(1):66-70. doi: 10.1007/s00128-007-9150-6. Epub 2007 Jun 27.
Catalytic wet air of coke-plant wastewater was studied in a bubbling bed reactor. Two types of supported Ru-based catalysts, eggshell and uniform catalysts, were employed. Compared with the results in the wet air oxidation of coke-plant wastewater, supported Ru uniform catalysts showed high activity for chemical oxygen demand (COD) and ammonia/ammonium compounds (NH3-N) removal at temperature of 250 degrees C and pressure of 4.8 MPa, and it has been demonstrated that the catalytic activity of uniform catalyst depended strongly on the distribution of active sites of Ru on catalyst. Compared to the corresponding uniform catalysts with the same Ru loading (0.25 wt.% and 0.1 wt.%, respectively), the eggshell catalysts showed higher activities for CODcr removal and much higher activities for NH3-N degradation. The high activity of eggshell catalyst for treatment of coke-plant wastewater can be attributed to the higher density of active Ru sites in the shell layer than that of the corresponding uniform catalyst with the same Ru loading. It has been also evidenced that the active Ru sites in the internal core of uniform catalyst have very little or no contribution to CODcr and NH3-N removal in the total oxidation of coke-plant wastewater.
在鼓泡床反应器中对炼焦厂废水的催化湿式空气氧化进行了研究。采用了两种负载型钌基催化剂，即蛋壳型催化剂和均匀型催化剂。与炼焦厂废水湿式空气氧化的结果相比，负载型钌均匀型催化剂在250℃温度和4.8MPa压力下对化学需氧量（COD）和氨/铵化合物（NH₃-N）的去除表现出高活性，并且已经证明均匀型催化剂的催化活性强烈依赖于钌在催化剂上活性位点的分布。与具有相同钌负载量（分别为0.25wt.%和0.1wt.%）的相应均匀型催化剂相比，蛋壳型催化剂对CODcr的去除表现出更高的活性，对NH₃-N的降解表现出更高得多的活性。蛋壳型催化剂处理炼焦厂废水的高活性可归因于壳层中活性钌位点的密度高于具有相同钌负载量的相应均匀型催化剂。还证明了在炼焦厂废水的完全氧化中，均匀型催化剂内芯中的活性钌位点对CODcr和NH₃-N的去除贡献很小或没有贡献。
