丙烯腈废气净化催化剂性能评价

Evaluation on performances of acrylonitrile waste-gas cleaning catalyst

在丙烯腈废气净化侧线评价装置上,对自制的含Pt,Pd贵金属蜂窝状燃烧催化剂进行了性能评价,并考察了反应温度、空速等操作条件对催化性能的影响。结果表明：废气中可燃物的起燃温度约为255℃,催化剂适应空速为28000-43000 h^-1,并要求废气中水蒸气体积分数小于20%、反应后气体中的残氧体积分数不得低于0.5%;满足上述工艺条件后,该催化剂表现出良好的催化活性和较好的热稳定性,1000 h运转过程中,废气净化率均在99%以上,净化后尾气中总烃体积分数小于30×10^-6,能够满足工业应用的要求。

The performances of the self - made noble metal honeycomb catalyst containing platinum and palladium were evaluated in an acrylonitrile waste - gas cleaning sideline experiment unit. The influences of operation conditions such as reaction temperature and space velocity et al on catalytic performances were investigated. The results showed that the optimal conditions were：initial burning temperature of combustible substances in waster- gas about 255 ℃, feasible space velocity for the catalyst ranging from 28 000 h^- 1 to 43 000 h^- 1, volume fraction of water vapor in waster - gas less than 20%. Under these conditions, the catalyst had good catalytic activity and thermal stability. The waster - gas cleaning rate was more than 99% and the volume fraction of total hydrocarbon in cleaned tail gas was less than 30 × 10^-6 during 1 000 h running test. The performances of the catalyst could meet the needs of industrial application.