Notice of RetractionPreparation of Cyanamide by Decomposition of Urea

The paper mainly studies a new preparation technology of cyanamide. The auther designs a new technology: urea-cyanamide method. Different catalysts were used in the technoloy: ZSM-5 zeolite which are doped with transition metal cations selected from the Group A and Group B. The prepared catalysts were used in the decomposition of urea. Reaction conditions were as followed: with certain reaction temperature, reaction time, certain amount of catalyst, in the atmosphere of ammonia, so that the urea was decomposited into Cyanamide under normal pressure. This technology confirms atomic economical principle and it is low energy-consuming with little pollution and simple refining technology. Therefore it is a technology with good social and economic benefit. The difficulty of urea-cyanamide method is the selection of catalyst and high requirements for equipment.