Spray Pyrolysis Metal Oxide Production Spatial Segmentation
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Solution Overview
Problem
Existing spray pyrolysis processes for producing metal oxides often result in undesirable products such as hollow spheres and broad particle size distributions, particularly when scaled up, which affects the homogeneity and quality of the metal oxide powders.
Innovation Solution
A spray pyrolysis process where a mixture containing ammonia and an aerosol, obtained by spraying a solution with a metal compound using an atomizing gas, is introduced into a high-temperature zone in an oxygen-containing atmosphere, with the flame and mixture being at least partially spatially separated, and the reaction conditions are optimized to control the particle size distribution and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray pyrolysis is used to produce metal oxides, then metal oxide powders can be produced efficiently, but hollow spheres and broad particle size distributions are formed
Solution Approach 1:
The process segments the reaction zone into distinct spatial regions: a flame generation zone and a separate reaction zone where the aerosol mixture reacts. This spatial segmentation prevents the aerosol from being directly exposed to the flame core, thereby avoiding the formation of hollow spheres and controlling particle size distribution more uniformly.
Solution Approach 2:
An atomizing gas (nitrogen or air) is introduced as an intermediary carrier to transport the metal compound solution as an aerosol into the reaction space. This intermediary aerosol medium allows controlled interaction between the metal compounds and the oxygen-containing atmosphere, preventing direct flame contact and improving particle homogeneity.
2Productivity
If the flame and mixture are completely mixed, then reaction efficiency is high, but homogeneity of metal oxide particles deteriorates
Solution Approach 1:
The reaction space is designed with local quality differentiation: the flame is generated in one region while the aerosol mixture reacts in a separate region with oxygen-containing atmosphere. This local spatial differentiation allows the reaction to proceed efficiently while maintaining uniform particle composition and structure throughout the metal oxide powder.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process achieves a high degree of homogeneity in particle size distribution and improved quality of metal oxide powders, with lower BET surface area and average particle size, enhancing the production of metal oxides like Li x La 3 Zr 2 M y O 8.5+0.5x+z and Li x La 3 Zr 2 Al y O 8.5+0.5x+1.5y compositions.
Implementation Method 1
spraying a solution containing a metal compound using an atomizing gas, preferably nitrogen or air, into a high-temperature zone
Implementation Method 2
a flame which is formed by the reaction of an oxygen-containing gas and a fuel gas
Implementation Method 3
where they are oxidized and/or hydrolyzed to produce metal oxides
Implementation Method 4
subsequently separates the solid, the high-temperature zone into which the mixture is introduced
Data Source
Figure 1A~2B
AI summary
The invention relates to a method for producing a metal oxide powder by means of spray pyrolysis, in which a mixture containing ammonia and an aerosol, which is obtained by spraying a solution containing a metal compound by means of an atomizing gas, is introduced into a high temperature zone of a reaction chamber where it is then reacted in an oxygen-containing atmosphere and subsequently, the solid material is separated.