Plate-Shaped Iron Oxide Particles With Molybdenum for High Dispersibility
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Solution Overview
Problem
Current methods for producing plate-shaped iron oxide particles do not achieve optimal characteristics such as high aspect ratio, small particle size, and dispersibility, and there is a need for improved production techniques that incorporate molybdenum and shape control agents effectively.
Innovation Solution
The production of plate-shaped iron oxide particles involves calcining an iron compound in the presence of a molybdenum compound and a shape control agent, such as silicon, at controlled temperatures, which results in particles with a median diameter of 0.01 μm to 0.5 μm, an aspect ratio of 5 to 500, and a specific surface area of 0.5 m2/g or more, with molybdenum unevenly distributed in the surface layer for enhanced catalytic activity and dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional hydrothermal reaction or arc plasma method is used to produce iron oxide particles, then particles can be obtained, but the aspect ratio is insufficient and dispersibility is poor
Solution Approach 1:
The invention changes the chemical composition parameters by introducing molybdenum compounds and shape control agents (silicon, germanium, or phosphorus) into the calcination process. This compositional modification enables the formation of plate-shaped particles with aspect ratios of 5-500 while simultaneously improving dispersibility through controlled surface properties.
Solution Approach 2:
The invention creates a composite structure by incorporating molybdenum and shape control agent atoms into the iron oxide particle matrix. This composite approach, where multiple elements are integrated at the atomic level, produces particles that exhibit both the desired plate shape and enhanced dispersibility characteristics.
2Area of moving object
If particle size is reduced to increase surface area, then catalytic activity improves, but production complexity increases
Solution Approach 1:
The invention controls the calcination temperature parameter (400-1000°C) to simultaneously achieve small particle size with plate morphology. By optimizing this thermal parameter in the presence of molybdenum and shape control agents, the process produces high-surface-area particles without requiring complex multi-step size reduction procedures.
3Ease of manufacture
If traditional production methods are used, then manufacturing is simpler, but energy consumption is high
Solution Approach 1:
The invention modifies the chemical environment parameters during calcination by adding molybdenum compounds and shape control agents. These compositional changes enable plate-shaped particle formation at relatively low temperatures (400-1000°C), significantly reducing energy consumption compared to traditional high-temperature sintering methods while maintaining manufacturing simplicity.
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
This method produces plate-shaped iron oxide particles with excellent catalytic activity and high dispersibility, achieving a high aspect ratio and small particle size while reducing production costs and energy consumption compared to traditional methods.
Implementation Method 1
calcining an iron compound in presence of a molybdenum compound and a shape control agent
Implementation Method 2
molybdenum and atoms derived from a shape control agent... molybdenum unevenly distributed in the surface layer
Implementation Method 3
plate-shaped iron oxide particles... aspect ratio obtained by dividing an average particle size of primary particles by a thickness thereof is 5 to 500
Data Source
AI summary
The present invention relates to plate-shaped iron oxide particles containing molybdenum and atoms derived from a shape control agent. The present invention relates to a method for producing the plate-shaped iron oxide particles, the method including a calcination step of calcining an iron compound in the presence of a molybdenum compound and a shape control agent.