Amorphous Cobalt-Silicon Oxide Catalyst for PMS Activation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current advanced oxidation processes for degrading organic pollutants in water, particularly those using peroxymonosulfate (PMS), are limited by the efficiency of catalysts, with crystalline cobalt oxides being more effective than amorphous counterparts despite the potential benefits of amorphous catalysts due to their lower economic costs and tunable porosities.
Innovation Solution
Development of an amorphous cobalt-inherent silicon oxide (Co—SiOx) catalyst that forms Co substitution for Si atoms in silicon oxide, altering Co coordination from tetrahedral to octahedral and increasing the average Co oxidation state, enhancing catalytic performance during PMS activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crystalline cobalt oxides are used as catalysts, then catalytic activity is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the structural parameter of the catalyst from crystalline to amorphous form, and modifies the coordination environment of cobalt atoms (from tetrahedral to octahedral) and oxidation state (increasing average Co oxidation state), thereby achieving high catalytic activity in an amorphous silica-supported cobalt catalyst that is more cost-effective than crystalline cobalt oxides
Solution Approach 2:
The patent creates a composite material system where cobalt species are supported on amorphous silica, forming a heterogeneous catalyst that combines the advantages of both components - the cost-effectiveness and tunable porosity of amorphous silica with the catalytic activity of cobalt, achieving performance comparable to or exceeding crystalline cobalt oxides
2Ease of manufacture
If amorphous catalysts are used, then manufacturing cost decreases and porosity becomes tunable, but catalytic activity is reduced
Solution Approach 1:
The patent changes the structural parameter of the catalyst from crystalline to amorphous form, and modifies the coordination environment of cobalt atoms (from tetrahedral to octahedral) and oxidation state (increasing average Co oxidation state), thereby achieving high catalytic activity in an amorphous silica-supported cobalt catalyst that is more cost-effective than crystalline cobalt oxides
Solution Approach 2:
The patent creates localized active sites on the amorphous silica surface by introducing cobalt species with specific coordination environments (octahedral Co with increased oxidation state), where the local structure around cobalt atoms is optimized for catalysis while the bulk amorphous structure provides cost benefits and tunable porosity
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 amorphous Co—SiOx catalyst exhibits superior catalytic activity in activating PMS, achieving nearly 100% degradation of 2,4-DCP within 6 minutes with a higher kinetic rate constant compared to crystalline cobalt oxides and silica, demonstrating robust and efficient PMS activation.
Implementation Method 1
amorphous cobalt-inherent silicon oxide (Co—SiOx) catalyst for use in catalytic activation of PMS
Implementation Method 2
forms Co substitution for Si atoms in silicon oxide, altering Co coordination from tetrahedral to octahedral and increasing the average Co oxidation state
Data Source
AI summary
Claimed herein is a method of applying amorphous Co—SiOx to activate PMS and produce SO4·− due to the formation of Co(II)-Ov, pairs via the substitution of Si by Co. The inherent Co significantly change the electronic structure of O and Si atoms in the Co—SiOx via final state effects and increase the conductivity in terms of more effective electron transfers. The claimed method using Co—SiOx functions as a more effective oxidative catalyst for the faster degradation of pollutants. The simplicity of the synthetic procedures indicates that the conductive Co—SiOx could be used for the activation of PMS and other electrochemical applications on a wider scale.