氨的催化氧化是中学化学教学的重要内容之一。现行中学教材安排有用铂作催化剂进行氨催化氧化的实验。铂是一种昂贵的金属,目前许多中学没有铂丝,因而无法作这个实验。为寻求一种价廉易得的物质代替铂作为催化剂,进行氨的催化氧化实验,过去曾有过许多介绍。如介绍了用铜作催化剂,但进行实验时需要以纯氧代替空气,给实验带来麻烦。南京师范学院介绍以镀银镜铜丝代替铂作催化剂,这是一种行之有效的办法,值得推广。作者曾用三氧化二铬(以重铬酸铵加热分解制得)作为催化剂进行实验,也收到一定效果。最近我们用银石棉(即镀银镜的石棉)作催化剂,实验效果比上述几种都好,特别适于进行课堂演示实验。同时我们将用镀银铜丝进行实验的方法作了一些改进,实验效果有所提高,现一并介绍如下: The catalytic oxidation of ammonia is one of the important contents of chemistry teaching in middle school. The current middle school textbook arranges platinum as catalyst for ammonia catalytic oxidation experiment. Platinum is an expensive metal that many secondary schools do not currently have and can not make this experiment. There have been many introductions in the past to seek a cheap and readily available material to replace platinum as a catalyst for the catalytic oxidation of ammonia. Such as the introduction of copper as a catalyst, but the need for experiments with pure oxygen instead of air, to experiment with trouble. Nanjing Teachers College to silver mirror silver instead of platinum as a catalyst, which is an effective way, it is worth promoting. The author has used chromium oxide (with ammonium dichromate decomposition) as a catalyst for experiments, also received some results. Recently, we use silver asbestos (silver mirror asbestos) as a catalyst, the experimental effect is better than the above several, especially suitable for classroom demonstration experiments. At the same time, we will use silver-plated copper wire method of experiment made some improvements, experimental results have increased, now and introduced as follows: