Silicon-Modified Zinc Oxide Thermal Sintering Resistance
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Solution Overview
Problem
Zinc oxide materials used in catalysts and absorbents suffer from thermal sintering, which reduces their surface area and impacts their performance over time.
Innovation Solution
The development of silicon-modified zinc oxide materials prepared by precipitation, which have a BET surface area of at least 50 m2/g, a Si:Zn atomic ratio between 0.001 and 0.5:1, and are formulated into shaped units such as pellets, extrudates, or granules, or applied as a wash-coat on a monolith support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc oxide materials are used in catalysts and absorbents, then they provide catalytic activity and hydrogen sulphide removal capability, but thermal sintering occurs which reduces their surface area and impacts performance over time
Solution Approach 1:
Silicon is incorporated into the zinc oxide lattice during the precipitation process before the material is put into service. This preliminary modification prevents thermal sintering from occurring during subsequent high-temperature operation, thereby maintaining surface area and catalytic stability over time
Solution Approach 2:
The chemical composition of zinc oxide is modified by incorporating silicon at controlled levels (Si:Zn atomic ratio of 0.001 to 0.5:1). This parameter change in composition fundamentally alters the thermal behavior of the material, preventing sintering and maintaining surface area stability at elevated temperatures
2Stability of the object's composition
If silicon is incorporated into zinc oxide to prevent thermal sintering, then thermal stability and surface area are improved, but the material composition and structure become more complex
Solution Approach 1:
Silicon is incorporated locally into the zinc oxide lattice at specific atomic ratios rather than uniformly mixing two separate materials. This localized modification within the crystal structure achieves thermal stability while maintaining a relatively simple single-phase material composition
Solution Approach 2:
A silicon-modified zinc oxide composite material is created where silicon and zinc oxide are combined at the atomic level. This composite approach provides enhanced thermal stability while maintaining a controlled and relatively simple overall material composition suitable for industrial applications
3Quantity of substance
If zinc oxide crystallites are allowed to coalesce through thermal sintering, then material density may increase, but surface area is reduced which impacts catalyst and absorbent effectiveness
Solution Approach 1:
Silicon modification is applied in advance to prevent the harmful coalescence of zinc oxide crystallites. This preliminary anti-action counteracts the natural tendency toward sintering, thereby preserving both surface area and controlling density characteristics for optimal catalyst and absorbent performance
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 silicon-modified zinc oxide materials exhibit improved thermal stability, maintaining higher surface areas and extended catalyst or sorbent life, leading to enhanced process efficiency.
Implementation Method 1
these materials in use can suffer from thermal sintering by which zinc oxide crystallites coalesce thereby reducing their surface area
Implementation Method 2
the silicon is incorporated into the zinc oxide lattice
Data Source
AI summary
A silicon-modified zinc oxide material, wherein the silicon-modified zinc oxide material (i) has a BET surface area of at least 50 m2/g, (ii) has a Si:Zn atomic ratio in the range of 0.001 to 0.5:1 and (iii) is in the form of a shaped unit selected from a pellet, extrudate or granule, or a wash-coat on a monolith support. The silicon-modified zinc oxide material has improved resistance to thermal sintering and may be used as a catalyst or sorbent material.