Mixed Oxide Catalysts for Lipid Oxidative Cleavage
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Solution Overview
Problem
Current methods for the oxidative cleavage of unsaturated fatty acids or their esters typically require multi-step processes and hazardous oxidants, with few examples of heterogeneous catalysts capable of single-step cleavage using molecular oxygen without precious metals or organic solvents.
Innovation Solution
Development of ternary or multiple mixed oxides comprising Cerium and Niobium, along with metals like Cu, La, and Bi, which act as catalysts for the single-step oxidative cleavage of unsaturated fatty acids or their esters to produce mono and dicarboxylic acids using molecular oxygen as the oxidant, eliminating the need for precious metals and organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-step processes are used for oxidative cleavage of unsaturated fatty acids, then the cleavage can be achieved, but the process complexity increases and hazardous oxidants are required
Solution Approach 1:
The patent combines multiple reaction steps (oxidation and cleavage) into a single catalytic step using mixed metal oxide catalysts. The catalyst system performs both the formation of diol intermediates and their subsequent cleavage in one pot, eliminating the need for separate reaction vessels and workup steps between oxidation and cleavage operations.
Solution Approach 2:
The patent changes the oxidant from hazardous reagents (ozone, peracids, metal peroxides) to molecular oxygen, and adjusts catalytic parameters by using mixed metal oxide systems with specific metal combinations (e.g., Mn-Cu, Fe-Mn, Co-Mn) to achieve active oxygen species generation under milder and safer conditions.
2Productivity
If hazardous oxidants like ozone or peracids are used for direct cleavage, then single-step oxidation is achieved, but safety and environmental concerns increase
Solution Approach 1:
The patent converts molecular oxygen, which is normally unreactive toward isolated carbon-carbon double bonds, into a potent oxidizing agent by using mixed metal oxide catalysts that generate highly reactive oxygen species (superoxide, peroxide, singlet oxygen) in situ. This allows the benign substance oxygen to perform the function of hazardous oxidants.
Solution Approach 2:
The patent introduces mixed metal oxide catalysts as intermediaries that mediate between molecular oxygen and the substrate. These catalysts activate oxygen to form reactive oxygen species that can selectively cleave carbon-carbon double bonds, avoiding the need for direct contact with hazardous oxidants.
3Reliability
If precious metals are used as catalysts for oxidative cleavage, then catalytic activity is achieved, but cost increases
Solution Approach 1:
The patent replaces expensive precious metal catalysts (Ru, Os, Ir) with cheaper base metal oxide systems (Mn-Cu, Fe-Mn, Co-Mn, Ni-Cu). These earth-abundant metal oxides provide comparable catalytic activity for oxygen activation and oxidative cleavage reactions, dramatically reducing catalyst cost while maintaining effectiveness.
Solution Approach 2:
The patent uses composite mixed metal oxide systems where synergistic interactions between different metal oxides enhance catalytic activity. For example, Mn-Cu mixed oxides combine the oxygen activation capability of MnOx with the redox properties of CuO, creating a more effective and stable catalyst than either component alone.
4Ease of operation
If organic solvents are used in oxidative cleavage reactions, then reaction conditions are improved, but environmental impact and safety concerns increase
Solution Approach 1:
The patent employs water as the reaction medium, which serves multiple functions: it is the solvent for the reaction, the source of oxygen for oxidation (via water activation by metal catalysts), and the final product medium. This eliminates the need for separate organic solvents and simplifies the overall process while improving safety and environmental compatibility.
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 catalysts enable efficient, solventless, and cost-effective single-step conversion of unsaturated fatty acids to carboxylic acids with high yields, using safe and non-corrosive oxygen as the oxidant, avoiding the limitations of traditional methods that require hazardous reagents and multiple steps.
Implementation Method 1
The oxidation in controlled conditions of unsaturated FAs is a synthetic route useful for the synthesis of several added value chemicals
Implementation Method 2
The catalysts of the present invention can be used with recovered unsaturated animal or vegetal oils
Data Source
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Figure 3
AI summary
This invention relates to the synthesis of new catalysts based on earth crust abundant mixed oxides that can produce cleavage of fatty acids (FA), FA methyl esters, or even lipids in a single step using oxygen as oxidant in solventless conditions.