The invention relates to a preparation method for a platinum-rhodium alloy knitted catalytic sleeve net, the alloy composition mass percentage is: 2 ~ 10 rhodium, 7 ~ 9 palladium, platinum allowance, and includes the following steps: Vacuum intermediate frequency melting, alloy forging, casting rolling, alloy wire drawing, splicing mesh and finished catalytic net activation, wire drawing includes coarse wire drawing, medium wire drawing and fine wire drawing three steps, splicing mesh after washing the net 1 times, and then acid cleaning 1 times, finished catalytic net activation for the use of hydrogen flame activation. Beneficial effect: using the metal recovery function of palladium, increasing the proportion of palladium content in the catalytic net can recover the platinum dropped from the upper catalytic net, play a catalytic role again, can reduce the overall loss of platinum-rhodium metal, prolong the service life of the catalytic net, and save costs for enterprises.
Molybdenum rhodium alloy catalytic net is widely used in the production of nitric acid in the chemical industry, the production of caprolactam and hydrocyanic acid in the petrochemical industry. Take ammonia oxidation to nitric acid production as an example, due to the development of science and technology. The progress of production technology and equipment update and improvement, its production scale gradually increased, the production process gradually optimized. The catalytic network used has developed from single molybdenum network to ternary alloy, to binary, ternary and even multivariate alloy. Catalytic mesh structure from the original single flat woven development to the present knitting.
Catalytic system: the catalytic network is composed of molybdenum, rhodium and palladium alloys. According to the special production process, each layer of the network has different alloy components, so that the FTC catalytic system has the dual functions of catalysis and recovery. FTC catalytic system greatly reduces the amount of molybdenum, so as to save money, FTC catalytic network in reducing production costs at the same time, improve the ammonia oxidation rate, prolong the service life of molybdenum network.
In order to overcome the shortcomings of the traditional plain knitting net and the existing knitting net in terms of technology, performance and comprehensive use effect, the invention provides a new molybdenum rhodium alloy knitting catalytic net and a preparation method thereof.
