Preparation of Nanocatalysts Using Deposition Precipitation with Urea: Mechanism, Advantages and Results

Abstract The main works carried out on precipitation deposition with urea (DPU) are summarized. This method is widely applied and considered as excellent for the preparation of catalysts. It proved to be the optimum technique, e.g., in view of deposition yield, total reduced particle size, high particle distribution, and metal‐support interaction. The influence of several parameters on the DPU process, such as the effect of temperature during deposition, maturation time, annealing manner of the final powder, metal and the urea concentrations and others, are discussed. The main steps of the DPU, the preparation of monometallic catalysts by this variant, and the bimetallic catalysts obtained by co‐deposition precipitation with urea (CO‐DPU) are described.