Technical characteristics of a cellular catalyst for the reduction of nitrogen (II) and (IV) oxides and design of a suitable reactor

Abstract

The method of the designing of industrial reactors with metal cellular catalysts is considered in the article. The proposed catalysts can be used for the low-temperature purification of exhaust gases from nitrogen oxides using ammonia. The advantages of catalytic blocks are shown in comparison with the catalysts ABK-10 that is widely used in industry. The procedures of physicochemical study and analytical control are developed. Based on laboratory tests, the sizes and structure of the proposed reactors are determined. Required amount of catalyst in the form of metal cellular blocks is determined for two types of reactors: with rectangular and circular cross-sections. The length of catalytic units is calculated and production technology is proposed. Hydrodynamic calculations demonstrate that block catalysts have lower flow resistance that the granulated ones. The reactors of circular cross-section need catalytic units of smaller volume than rectangular ones; however, the latter have a lower resistance to gas flow. The study shows that the metal cellular catalytic blocks would allow avoiding the use of additional compressors for excessive pressure to purge gases through the catalyst bed, which should reduce economic costs, and, ultimately, reduce the cost of the product.