Cu-Ni/TiO2 Catalyst Core-Shell Structure for Biomass Biorefining
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Solution Overview
Problem
Current catalytic processes for converting biomass-derived 5-(hydroxymethyl)furfural (HMF) and furfural (FF) to methylated furans face challenges in achieving high yields, selectivity, and catalyst stability, with existing base metal catalysts experiencing issues like decarbonylation and ring hydrogenation, and noble metal catalysts being economically unviable for industrial use.
Innovation Solution
A Cu—Ni/TiO2 catalyst system is developed, where copper-nickel particles form core-shell structures with copper enriched at the surface, enabling high yields of dimethyl furan (DMF) and methyl furan (MF) through support-induced metal segregation, enhancing stability and regeneration compared to monometallic Cu catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If base metal catalysts (Ni, Co, Fe) are used for HDO of HMF and FF, then cost is reduced and toxicity is controlled, but undesired reactions (decarbonylation and ring hydrogenation) occur and catalyst stability is low
Solution Approach 1:
The patent uses a bimetallic Cu-Ni composite catalyst where copper and nickel work synergistically. The Cu-rich surface provides selectivity for hydrogenation reactions while minimizing decarbonylation and ring hydrogenation, while the Ni component enhances overall catalytic activity. This composite structure resolves the contradiction by combining the low cost and reduced toxicity of base metals with improved stability and selectivity through metal synergism.
Solution Approach 2:
The patent creates a non-uniform catalyst surface with Cu enrichment at the surface and Ni enriched in the bulk/subsurface regions. This local quality distribution allows the Cu-rich surface to selectively promote hydrogenation while suppressing unwanted reactions, while the Ni in the bulk provides structural stability and enhanced activity. The local composition control resolves the stability-selectivity contradiction.
2Object-generated harmful factors
If Cu catalysts are used for HDO of FF, then decarbonylation and ring hydrogenation are minimized, but conversion of FOL to MF is slow due to weak interaction
Solution Approach 1:
The patent merges Cu and Ni into a bimetallic catalyst system where the components work synergistically. The Cu component maintains low side reactions while the Ni component enhances the interaction strength with FOL intermediates. The combination resolves the contradiction by integrating the selective nature of Cu with the higher reactivity of Ni, achieving both low unwanted reactions and high productivity.
Solution Approach 2:
The patent changes the catalyst composition parameter by introducing Ni into the Cu catalyst system. This compositional change modifies the electronic and geometric properties of the catalyst surface, enhancing the interaction strength with FOL while maintaining the selective hydrogenation pathway. The parameter change from monometallic Cu to bimetallic Cu-Ni resolves the rate-selectivity trade-off.
3Manufacturing precision
If multiple processing steps are used for biomass conversion, then product yield requirements per step are reduced, but overall process complexity and cost increase
Solution Approach 1:
The patent develops a universal Cu-Ni/TiO2 catalyst system that can simultaneously handle HDO of both HMF and FF in a single reactor. This multi-functional catalyst performs multiple transformations (hydrogenation, hydrogenolysis) for different substrates under the same conditions, eliminating the need for separate processing steps. The universality of the catalyst resolves the contradiction by consolidating multiple steps into one, maintaining acceptable yields while reducing complexity.
Solution Approach 2:
The patent merges the conversion of HMF and FF into a single one-pot reaction using the bimetallic catalyst. Both substrates are converted to their respective products (DMF and MF) simultaneously in the same reactor with the same catalyst, combining what would traditionally require separate processing steps. This merging approach reduces process complexity while maintaining high yields for both products.
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 Cu—Ni/TiO2 catalyst achieves 87.5% yield of DMF from HMF and 88.5% yield of MF from FF in a one-pot reaction, demonstrating improved stability and regeneration, outperforming previous catalyst systems by maintaining high selectivity and activity across multiple recycles.
Implementation Method 1
selective hydrodeoxygenation (HDO) (hydrogenation followed by hydrogenolysis)
Implementation Method 2
selective hydrodeoxygenation (HDO) (hydrogenation followed by hydrogenolysis)
Implementation Method 3
catalytic production of DMF and MF from biomass derived HMF and FF
Data Source
AI summary
A method is disclosed for converting biomass into a fuel additive, the method comprising: liquefying the biomass to form a liquor; neutralizing the liquor; precipitating lignin out of the liquor; extracting furfural (FF) and 5-hydroxymethylfurfural (HMF) from the liquor; and hydrodeoxygenating (HDO) the extracted furfurals over a Cu—Ni/TiO2 catalyst. The catalyst for hydrodeoxygenating (HDO) furfural (FF) and 5-hydroxymethylfurfural (HMF) to methylated furans comprises copper-nickel (Cu—Ni) particles supported on titanium dioxide (TiO2), and wherein the copper-nickel particles form core-shell structures in which copper (Cu) is enriched at a surface of the catalyst.