接触法生产H_2SO_4和固体SO_3的制备,是现行统编高一教材的一个课堂演示实验。过去介绍这方面的资料和经验以及具体的方法也很多,笔者都分别进行过实验,总的体会是,SO_2通过催化氧化成SO_3完全可靠,但如何将SO_2通过催化剂氧化制成固体SO_3困难很大。笔者对如何制得固体SO_3,曾在反应气体的制备、纯度和储存,催化剂的选 Production of H_2SO_4 and solid SO_3 by contact method is a classroom demonstration experiment of the current high school textbook. The past introduction of this information and experience as well as specific methods are many, the author has conducted experiments, the general experience is that SO_2 by catalytic oxidation to SO_3 completely reliable, but how the SO_2 catalyst oxidation to solid SO_3 difficult . The author of how to make solid SO_3, had in the reaction gas preparation, purity and storage, the catalyst of the election