Cerium Oxide Catalyst for Cycloalkane Oxidation
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Solution Overview
Problem
Current processes for oxidizing cyclohexane to produce cyclohexanone and cyclohexanol, known as KA oil, rely on environmentally unfriendly catalysts like chromium and cobalt, which are costly and have a significant environmental footprint, necessitating the development of cost-effective, non-toxic alternatives with high oxidation ability and selectivity.
Innovation Solution
A method involving the use of a cerium oxide-based catalyst to oxidize cycloalkanes with hydroperoxide compounds, producing a mixture of alcohol and ketone with high conversion and selectivity, thereby replacing traditional catalysts and improving process economics and environmental sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chromium or cobalt catalysts are used for cyclohexane oxidation, then high oxidation ability and selectivity are achieved, but environmental harm and cost increase
Solution Approach 1:
The patent changes the chemical composition parameter of the catalyst from toxic chromium/cobalt-based catalysts to non-toxic cerium oxide-based catalysts. This parameter change maintains the catalytic function while eliminating environmental harm, directly resolving the contradiction between oxidation ability and environmental harm.
Solution Approach 2:
The patent employs a heterogeneous catalyst (cerium oxide-based) that can be easily separated and potentially reused, replacing expensive and environmentally harmful homogeneous catalysts. The heterogeneous nature allows for simpler disposal or regeneration, reducing long-term environmental impact and cost.
2Reliability
If chromium or cobalt catalysts are used for cyclohexane oxidation, then high oxidation ability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive chromium and cobalt catalysts with cheaper cerium oxide-based catalysts. Cerium is a more abundant and less expensive rare earth element, significantly reducing catalyst manufacturing cost while maintaining acceptable oxidation performance.
Solution Approach 2:
The patent changes the catalyst composition from expensive precious metals (chromium, cobalt) to more economical cerium oxide. This parameter substitution directly addresses the cost issue while preserving the essential catalytic oxidation function through optimized reaction conditions.
3Productivity
If traditional two-step oxidation process is used, then KA oil is produced, but process complexity and time increase
Solution Approach 1:
The patent combines the thermal auto-oxidation step and the catalytic decomposition step into a single integrated process. By using cerium oxide-based catalysts that can facilitate both oxidation and decomposition reactions, the process reduces the number of separate steps, simplifying the overall manufacturing complexity while maintaining productivity.
Solution Approach 2:
The cerium oxide-based catalyst exhibits multi-functionality, serving both as an oxidation catalyst and a decomposition catalyst. This universal catalytic action eliminates the need for separate catalyst systems for each step, reducing process complexity and improving overall efficiency.
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 cerium oxide-based catalyst achieves high oxidation ability and selectivity in producing KA oil, enabling efficient production of adipic acid and polyamides while reducing the need for toxic catalysts, thus enhancing process efficiency and environmental sustainability.
Implementation Method 1
contacting a cycloalkane with a hydroperoxide compound in the presence of a catalytic effective amount of a cerium oxide based catalyst
Data Source
AI summary
The present invention concerns a method of oxidizing a cycloalkane to form a product mixture containing a corresponding alcohol and ketone, said method comprising contacting a cycloalkane with a hydroperoxide compound in the presence of a catalytic effective amount of a cerium oxide based catalyst.