贵金属催化剂活性组分分布对催化湿式氧化处理非达霉素提炼废水的影响

采用均匀型和蛋白型Ru/TiO₂催化剂为湿式氧化催化剂，应用于催化湿式氧化非达霉素提炼废水，以出水COD和TOC去除率作为指标来评价2种催化剂的催化活性差异；采用实验室连续评价装置对柱状颗粒催化剂在不同pH、不同废水流量和不同温度下处理非达霉素提炼废水进行了优化评价。结果表明：在265 ℃、pH=4.1、废水流量为10 mL·h⁻¹时，催化剂的催化活性最高，故确定此条件为该废水处理的最优条件；同时对比均匀型和蛋白型2种催化剂，蛋白型催化剂具有更高的催化效率；结合SEM及N₂-物理吸附结果，推断蛋白型催化剂活性组分集中分布在催化剂颗粒的较浅层，有利于降低反应过程中的扩散阻力，提高贵金属活性组分的利用率，进而提高催化剂的催化活性。以上结果对开发高效湿式氧化催化剂，充分利用贵金属活性组分降低催化剂成本具有十分重要的意义。

Influence of noble catalyst active component distribution on treating wastewater from fidaxomicin extract and purify process by catalytic wet air oxidation

The uniform type and egg-white type Ru/TiO2 catalyst were applied for catalytic wet air oxidation of an actual wastewater from fidaxomicin extract and purify process, the effluent COD and TOC removal were taken to evaluate the catalytic activity of these two catalysts. The experiments were conducted on a bench-scale continuous equipment to evaluate and optimize the cylindric particle catalyst under different pH, influent rate and temperature. The results demonstrated that the highest catalytic activity could be achieved under the conditions of 265 ℃, pH=4.1 and influent rate of 10 mL·h−1. And at this optimized condition, the egg-white type catalyst showed higher catalytic efficiency than the uniform type catalyst. Combined with the SEM images and N2 physical absorption-desorption data, we deduced that the active component of egg-white type catalyst existed in the shallow layer of the catalyst particle which could reduce the diffusion resistance, improve the utilization of noble metal component and then the catalytic activity. This work is very important for developing efficient catalysts in catalytic wet air oxidation and making full use of noble-metal active component to reduce the cost of catalyst preparation.