Nano manganese oxide molecular sieve for room temperature efficient nitrogen oxide removal and preparation method thereof

Abstract

The present invention relates to a nano manganese oxide molecular sieve for room temperature efficient nitrogen oxide removal and a preparation method thereof. The nano manganese oxide molecular sieve is prepared by doping a nano manganese oxide matrix with 0 to 30% by weight of an alkaline earth metal ion; the specific surface area of the nano manganese oxide molecular sieve is 160-270m<2 > / g; and the nano manganese oxide molecular sieve has surface oxygen vacancies. The nano manganese oxide molecular sieve has a high specific surface area, and thus having high nitrogen oxide adsorption storage capacity. The nano manganese oxide molecular sieve also has many surface defects (surface oxygen vacancies), and the surface defects can be used as catalytically active sites to enhance catalytic performance. Furthermore, by doping of the alkaline earth metal ion, the nano manganese oxide molecular sieve alkaline is enhanced, and acid nitrogen oxide adsorption storage capacity is enhanced.

Description

Technical field [0001] The invention provides a catalyst for efficiently removing low-concentration NOx at room temperature and a preparation method thereof, and relates to the preparation and application of inorganic nano materials, in particular to catalysis and environmental pollutant treatment. Background technique [0002] The development of cities and traffic roads gave birth to many semi-enclosed places such as road tunnels and indoor parking lots. In these semi-enclosed spaces, there is nitrogen oxide pollution (NO x , Of which NO accounts for more than 95%), far exceeding the national secondary air quality standards. As we all know, nitric oxide NO is a highly toxic and hazardous air pollutant. However, the harm and treatment of nitrogen oxides in these semi-enclosed spaces have not attracted enough attention. Because the enrichment effect of nitrogen oxide content caused by poor ventilation in these semi-enclosed spaces is bound to cause serious harm to the health of ...

AI Technical Summary

Problems solved by technology

However, for the low concentration of NO pollution with only a few ppm, neither of these two types of adsorption catalysts can obtain high adsorption efficiency.

On the other hand, although the Fe-Mn-based metal oxide catalyst with a mesoporous structure disclosed in CN103055799A can achieve efficient removal of low-concentration NO pollution at room temperature, it also has short duration of catalyst activity and rapid loss in humid environment. Lack of life

Images