Hydrogen cyanide,an important basic chemical stock,has been widely used in the synthesis of medicine and fine chemicals.However,hydrogen cyanide is usually produced at more than 1 000 ℃,in which,the noble metal catalysts,i.e.,Pt or Pt-Rh alloy catalysts are employed necessarily.To solve this problem,using a dielectric barrier discharge plasma,CH_4/NH_3 coupling reaction can be promoted by Cr catalyst to synthesize hydrogen cyanide,with a by-product of acetonitrile.The effects of Cr loading and the support m...