Method for synthesizing nano three-way catalyst

Abstract

The invention provides a method for synthesizing a nano three-way catalyst and belongs to the technical field of a catalyst preparation process. The method takes a metal organic salt and a commercial carrier as raw materials and comprises the following steps: reacting in a solvent at 60-300 DEG C for 1-720 minutes; and controlling experimental parameters including a mol ratio of reactants, the concentration of the reactants, a reducing agent, a reaction temperature and the like to form the nano three-way catalyst which is formed in series and has controllable structure, shape and size. The method provided by the invention has the advantages that the raw materials are cheap and easy to obtain, time for a reaction is short, the solvent can be repeatedly utilized, the equipment is simple, and the method is easy to realize and control, has good process repeatability and stable product quality, is safe and reliable to operate, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a method for synthesizing nanometer three-way catalyst powder, and belongs to the technical field of catalyst preparation technology. Background technique [0002] In recent years, with the development of the economy and the improvement of people's living standards, the number of residents' car ownership has continued to increase, and the impact of motor vehicle exhaust pollution on the environment has become increasingly prominent. Three-way catalysts can effectively remove harmful gas pollutants such as hydrocarbons, nitrogen oxides, and carbon monoxide in motor vehicle exhaust, and have been widely used. Many governments have mandated that motor vehicles must be equipped with exhaust gas treatment devices loaded with three-way catalysts. Due to the prominent environmental problems, the requirements for the performance of three-way catalysts are also increasing. [0003] At present, the improvement of the three-way catalyst ...

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Problems solved by technology

But need lower solution concentration, pressure is bigger in the hydrothermal kettle, required temperature is higher, thereby output is limited, there is certain safety problem again after amplifying; Mazumder etc. ) developed a method using oleylamine as a solvent and surfactant, and a noble metal salt as a precursor, but the solvent oleylamine used is expensive, and the solvent used is not easy to separate, and it needs to be loaded on a carrier later, and the loading process is also prone to loss of precious metals. The process is complicated, the cost is high, and it is difficult to enlarge the production

Hydrothermal, oleylamine, sodium oleate, etc., but the low output, the loss caused by after-loading and the complexity of the process limit its industrial application. In order to effectively control tail gas pollution, develop a catalyst with uniform particle size and controllable process difficulty. It is imminent to prepare catalysts that are convenient for industrial production, have high utilization rate of noble metal atoms and good catalytic performance

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