改性ZSM-5分子筛催化臭氧氧化含硅间甲酚

Catalytic ozonation silicon-containing m-cresol by modified ZSM-5 molecular sieve

在高效催化臭氧氧化煤化工废水过程中,水中的硅酸盐会使催化剂失活。本研究以ZSM-5分子筛为载体,使用等体积浸渍的方法成功制备了一系列抗硅催化剂,考察了活性组分种类、前驱体盐溶液种类、焙烧温度和活性组分负载量等相关工艺参数对催化剂抗硅性能和催化臭氧氧化降解含硅间甲酚模型废水效果的影响,并对抗硅催化剂进行了表征分析。结果表明,ZSM-5分子筛以Fe(NO_(3))_(3)·9H_(2)O作为前驱体盐浸渍,500℃焙烧,活性组分Fe负载量为3%(质量分数)时的抗硅催化剂呈现出优异的空间结构、最佳的抗硅性能和最高的催化臭氧氧化TOC去除率,此时间甲酚转化率为100%,TOC去除率为36.35%。同时,该催化剂在进行了240 h寿命实验后仍保持优异的催化活性和抗硅稳定性。

In the high-efficiency catalytic ozonation process of coal chemical wastewater,the catalyst was deactivated due to silicate in the water. In this paper,with ZSM-5 molecular sieve as the carrier,a series of anti-silicon catalysts were prepared by the equal volume impregnation method. The effects of the types of active components,the types of precursor salt solutions,the roasting temperature,and the loading of active components on the anti-silicon performance of the catalyst and the degradation of siliconcontaining m-cresol wastewater by ozonation were investigated. The characterization analysis of anti-silicon catalysts was also investigated. The results showed that when ZSM-5 molecular sieve was impregnated with Fe(NO_(3))_(3)·9H_(2)O as the precursor salt,calcined at 500 ℃,and 3% Fe active ingredient,the anti-silicon catalyst showed excellent spatial structure,the best anti-silicon performance and the highest TOC removal efficiency of catalytic ozonation reaction. Meanwhile,the conversion efficiency of m-cresol was 100%,and the TOC removal efficiency is 36.35%. The catalyst still maintained excellent catalytic activity and anti-silicon stability after 240 h life test.