A kind of preparation method of porous platinum oxide catalyst

Abstract

The invention belongs to the technical field of precious metal catalysts, and particularly relates to a preparation method of a porous platinum oxide catalyst. The method comprises the following stepsthat 1, platinum chloride is added into distilled water for even stirring to obtain a platinum ion solution; 2, aluminium chloride is added into the platinum ion solution, stirring is continued untilcomplete dissolution, then high-substituted hydroxypropyl cellulose is slowly added, and even stirring is conducted to obtain aluminium-platinum dispersion liquid; 3, ammonia gas is introduced circularly by means of sealed reflux until no sediment is generated, so that suspended dispersion liquid is obtained; 4, the suspended dispersion liquid is subjected to reduced pressure distillation reaction for 2-4 h, after cooling, viscous liquid is obtained, and then the viscous liquid is added into a mould for constant-temperature pressurizing solidification reaction for 2-4 h to obtain mixed solid;5, the mixed solid is immersed in distilled water for low-temperature stirring reaction for 2-4 h, and then porous solid is obtained after removal; 6, the porous solid is soaked in a hydrochloric acid solution for sealed micro-boiling reaction for 20-50 min, and then through filtering, washing and sintering, the porous platinum oxide catalyst is obtained.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalysts, and in particular relates to a preparation method of a porous platinum oxide catalyst. Background technique [0002] Due to their irreplaceable catalytic performance and selectivity, noble metal oxide catalysts play an extremely important role in the fields of petroleum, chemical industry, medicine, pesticide, energy and so on. Especially in recent years, with the rapid development of the national economy, the comprehensive construction of the expressway network, and the great improvement of living standards, cars have gradually integrated into people's daily lives. While bringing convenience to the society, they have also brought a series of social problems. , For example, the emission of automobile exhaust is a serious environmental pollution, which to a certain extent restricts the development of the national economy and endangers the health of the masses, becoming an important f...

AI Technical Summary

Problems solved by technology

In this method, platinum nitrate is first produced, and the latter is decomposed to release nitrogen oxides and oxygen to obtain platinum oxide. The platinum oxide produced by this method is not nano-scale, and the characteristics of many nano-materials cannot be reflected in the catalyst material.

[0004] The platinum oxide particles prepared by the traditional method are formed at high temperature during the sintering process, and the atoms between different platinum particles are easy to diffuse. Hundreds of nanometers to tens of microns, and may be sintered with other noble metal elements (such as rhodium) to form a larger alloy body, the catalytic activity of the noble metal alloy formed in this way is relatively weak. The relatively small surface area will inevitably cause the precious metal in the inner core of the particle to not be in direct contact with the exhaust gas components, reducing the effective and full utilization of precious metals and causing waste of precious metals in use