Porous Oxide Catalyst for Higher Silane Selectivity
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Solution Overview
Problem
Existing methods for producing higher silanes, such as disilane, face challenges in achieving high selectivity and preventing the formation of powdery or film-like solid silicon, which can clog reaction systems, especially at higher temperatures.
Innovation Solution
A catalyst comprising a porous oxide with a crystalline zeolite structure and controlled acid sites is used to convert monosilane to disilane at a lower temperature, inhibiting solid silicon formation and enhancing selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the treatment temperature is elevated to promote the reaction, then the reaction rate increases, but the selectivity of higher silane decreases and solid silicon is produced in larger amounts
Solution Approach 1:
The patent applies parameter changes by optimizing the treatment temperature to a specific range (200-400°C) that balances reaction rate and selectivity. This temperature parameter optimization prevents excessive reaction that would lead to solid silicon formation while maintaining adequate productivity for higher silane production.
2Manufacturing precision
If the treatment temperature is lowered to improve selectivity and inhibit solid silicon formation, then the selectivity increases, but the reaction rate decreases
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal temperature range (200-400°C) that maintains high selectivity while ensuring adequate reaction rate. This parameter optimization allows the process to achieve both high manufacturing precision and acceptable productivity without requiring extreme temperature conditions.
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 allows for the production of higher silanes with increased selectivity and reduced solid silicon formation, enabling efficient and stable production at lower temperatures.
Implementation Method 1
thermal treatment is carried out with the use of a catalyst which is alumina, a composite oxide containing alumina, or an alumina containing a noble metal element such as palladium and rhenium; in which technique, disilane is produced from monosilane at a temperature as low as about 300°C
Implementation Method 2
A catalyst comprising a porous oxide with a crystalline zeolite structure and controlled acid sites is used to convert monosilane to disilane
Data Source
Figure 1
AI summary
Provided are a catalyst for producing a higher silane with high yield at low cost by performing a reaction at relatively low temperature while inhibiting decomposition into solid silicon; and a process using the catalyst for producing a higher silane. The catalyst for producing a higher silane includes a porous oxide and is used to convert a lower silane to a higher silane wherein the porous oxide has at least regularly arranged pores and is primarily composed of silicon oxide, wherein a content of alkali metals and alkali earth metals in the porous oxide is not less than 0.00 wt% and not more than 2.00 wt%.