Ceramic Catalyst Spheroids via Silicon Carbide Oxidation
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Solution Overview
Problem
Existing methods for producing ceramic catalysts for chlorine dioxide generation are complex and time-consuming, involving multiple processing steps, which complicates the production and stability of these catalysts.
Innovation Solution
A process involving mixing a catalyst precursor with mineral particulates, a binder, and silicon carbide to form unfired spheroids, which are then heated to oxidize the silicon carbide and catalyst precursor, forming a ceramic catalyst material suitable for in situ aqueous chlorine dioxide production, reducing the number of processing steps and minimizing desorption and fines release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple processing steps are used to produce ceramic catalysts, then the catalyst can be manufactured with controlled properties, but the production process becomes complex and time-consuming
Solution Approach 1:
The patent combines multiple separate processing steps into a single integrated process. The catalyst precursor, binder, and silicon carbide are mixed and formed into spheroids in one operation, then heated together in a single firing cycle. This merging of steps reduces process complexity while maintaining control over catalyst properties through the unified formulation and treatment.
Solution Approach 2:
The patent incorporates the catalyst precursor and binder into the silicon carbide spheroid formation process before the heating step. This preliminary mixing and formulation ensures that all components are properly distributed and bonded before firing, eliminating the need for separate coating or assembly steps while maintaining manufacturing precision.
2Manufacturing precision
If multiple processing steps are used to produce ceramic catalysts, then the catalyst can be manufactured with controlled properties, but the production time increases
Solution Approach 1:
The patent merges multiple processing operations into a single heating cycle. The mixed formulation of catalyst precursor, binder, and silicon carbide spheroids is heated together in one continuous operation, eliminating the time required for separate drying, coating, and firing steps. This integrated approach maintains manufacturing precision while significantly reducing total production time.
Solution Approach 2:
The patent maintains continuous heating throughout the formation and maturing of the catalyst spheroids. The heating process continues uninterrupted through the formation of the green spheroids, drying, and final firing stages, eliminating idle times between operations. This continuous useful action reduces production time while ensuring consistent catalyst property development.
3Ease of manufacture
If traditional catalyst production methods are used, then catalysts can be manufactured, but desorption and fines release occur
Solution Approach 1:
The patent creates a composite structure where the catalyst precursor is embedded within a binder matrix that is itself embedded within silicon carbide spheroids. This multi-layer composite formulation provides structural integrity that prevents desorption of the catalyst material and eliminates fines release during handling and operation, while maintaining ease of manufacture through the integrated formation process.
Solution Approach 2:
The binder serves as an intermediary material that binds the catalyst precursor to the silicon carbide support structure. This intermediary layer prevents direct contact and potential desorption of the catalyst material, while the silicon carbide outer layer provides additional mechanical stability to prevent fines release. This intermediary approach maintains manufacturing ease while preventing material loss.
4Ease of manufacture
If traditional catalyst production methods are used, then catalysts can be manufactured, but pressure drops occur
Solution Approach 1:
The patent forms all catalyst particles into spherical spheroids with smooth, uniform surfaces. This spheroidal geometry minimizes surface irregularities and reduces flow resistance through the catalyst bed, eliminating pressure drops that would occur with angular or irregular particle shapes. The spherical form is achieved through the integrated mixing and forming process, maintaining ease of manufacture while eliminating the harmful pressure drop effect.
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 process simplifies the production of ceramic catalysts, reduces desorption and fines release, and effectively eliminates pressure drops, resulting in a more efficient and stable catalyst material for chlorine dioxide generation.
Implementation Method 1
heating the unfired spheroids at a temperature effective to oxidize the silicon carbide and the catalyst precursor material to form the ceramic catalyst material
Data Source
AI summary
A process for making a ceramic catalyst material includes mixing a catalyst precursor material with a mineral particulate to form a mixture; adding a binder, silicon carbide, and a parting agent to the mixture to form unfired spheroids; and heating the unfired spheroids at a temperature effective to oxidize the silicon carbide and the catalyst precursor material to form the ceramic catalyst material. In another embodiment, the process includes the addition of a catalyst metal oxide salt to an aluminosilicate hydrogel aggregate mixture. Once the mixture sets, the set mixture is heated to a temperature to effective to produce a high surface area ceramic catalyst material.