Preparation method of spherical nanoscale niobium pentaoxide powder

Abstract

The invention relates to a preparation method of spherical nanoscale niobium pentaoxide powder, comprising the following steps: niobium hydroxide and oxalic acid are heated and boiled in distilled water to prepare niobium oxalate solution; carbon black, the niobium oxalate solution and ethanediol are mixed according to proportion, the mass ratio of the niobium pentaoxide and the carbon black is 1:2-1:9, and the volume ratio of the niobium oxalate solution and the ethanediol is 1:2-1:3; pH value is adjusted to be 8-9 by ammonia water; the mixture is stirred, and the temperature is kept to be 60-70 DEG C for 8-15 minutes, and then cooling, water filling, placing still, filtering and drying are carried out; the dries product is calcined in a muffle furnace, so as to obtain the spherical nanoscale niobium pentaoxide powder. The prepared spherical nanoscale niobium pentaoxide powder has small grain diameter, particles are uniform and spherical and the dispersity is good; the purity of the product can reach more than 99.99 percent; the whole technological process is simple, the raw material source is wide, the price is low, the process is safe, and the method is beneficial to realizing industrialization.

Description

Technical field [0001] The invention relates to a method for preparing spherical nano-level niobium pentoxide powder, which can be used to prepare ceramic materials, nano materials and catalyst materials, and belongs to the field of nano materials and catalysts. Background technique [0002] As a new catalytic material, niobium oxide has attracted wide attention from scholars at home and abroad due to its unique catalytic performance. They can be used as active components, assistants or carriers of catalysts, and their catalytic effects are mainly derived from their unique catalytic properties. Acidity and redox properties, showing good catalytic performance in many reactions such as hydrocarbon conversion, selective oxidation, esterification, condensation, hydrolysis, hydration, hydrogenation / dehydrogenation. Not only that, niobium pentoxide is also widely used in ceramic capacitors, piezoelectric ceramics, new thermal materials, dielectric materials, magnetic materials and opti...

AI Technical Summary

Problems solved by technology

The niobium alcohol hydrolysis method uses niobium alkoxide as raw material, which is not only expensive, but also has very harsh process conditions; HF is used in the process of ammonia water precipitation after dissolving commercial niobium hydroxide, which seriously corrodes the equipment and safety in production Difficult to guarantee

In addition, these methods are difficult to prepare nano-niobium oxide with uniform particles, especially the electronic ceramic grade niobium pentoxide is required to have the characteristics of small particle size, narrow particle size distribution, less particle agglomeration and good dispersion.

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