TiO2 Catalyst Precursor with Auxiliary Shaping Agents
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Solution Overview
Problem
Current titanium dioxide-based catalyst precursor materials lack high specific surface areas and mechanical strength, making them unsuitable for producing shaped parts that can withstand reactor conditions in catalytic applications.
Innovation Solution
A TiO2-based catalyst precursor material in powder form with a specific surface area of at least 150 m2/g, coated with auxiliary shaping agents, is developed to enhance mechanical strength and specific surface area, allowing for the production of titanium dioxide shaped parts with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If titanium dioxide powder is used to produce shaped catalysts, then the catalyst can be used for certain applications, but the mechanical strength is insufficient causing disintegration under reactor conditions
Solution Approach 1:
The patent introduces auxiliary shaping agents (binders, plasticizers, lubricants) as intermediary substances that mediate between the titanium dioxide powder particles. These agents form a matrix that binds the particles together, providing mechanical strength while maintaining the catalyst's functional properties. The binder creates a cohesive structure that prevents disintegration under reactor conditions.
Solution Approach 2:
The patent creates a composite material system combining titanium dioxide powder with auxiliary shaping agents. This composite structure integrates the catalytic functionality of TiO2 with the mechanical strength provided by the binder system, achieving both chemical and mechanical performance requirements for catalyst applications.
2Strength
If titanium dioxide is mixed with auxiliary shaping agents to produce shaped parts, then mechanical strength improves, but the specific surface area decreases
Solution Approach 1:
The patent applies auxiliary shaping agents locally and in controlled amounts, primarily at the interfaces between TiO2 particles and in the void spaces between particles. This localized application provides mechanical binding strength without forming thick continuous layers that would significantly reduce the overall specific surface area of the catalyst.
Solution Approach 2:
The patent utilizes a porous structure where auxiliary shaping agents are distributed within the interparticle voids rather than forming dense coatings. This porous arrangement maintains high surface area by preserving the external surface of TiO2 particles while providing internal binding pathways for mechanical strength.
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 material achieves high mechanical strength and specific surface area, enabling the production of titanium dioxide shaped parts that are suitable for catalytic applications, such as Claus catalysis and selective catalytic reduction of nitrogen oxides, with enhanced durability and performance.
Implementation Method 1
a TiO2-based catalyst precursor material in powder form which contains TiO2 particles with the formula TiO(2-x)(OH)2x (x=0-1), wherein the particles are coated with one or more auxiliary shaping agents
Data Source
AI summary
A TiO2-based catalyst precursor material in powder form includes TiO2 particles with the formula TiO(2-x)(OH)2x (x=0-1). The particles are coated with one or more auxiliary shaping agents and after coating and drying have a specific surface area of at least 150 m2/g. The material has a content of 1) 50-99.5% by weight of the titanium-oxygen compound with the general formula TiO(2-x)(OH)2x, wherein x=0 to 1, or mixtures thereof, wherein the crystalline phases of the titanium-oxygen compound are in the anatase form, and 2) 0.5-50% by weight of an auxiliary shaping agent or mixtures thereof, which evaporates, sublimates and/or decomposes upon heating to temperatures below the transformation temperature from anatase to rutile, wherein the % by weight are relative to the total weight of the dried catalyst precursor material.