Biomass Conversion via Cu-Doped Catalyst Equilibria
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Solution Overview
Problem
Current methods for converting biomass into liquid and gaseous products, such as pyrolysis and gasification, are non-selective and produce significant char, while hydrolysis faces challenges with water separation and resistant chemical bonds in woody biomass.
Innovation Solution
A catalytic method using a Cu-doped metal oxide catalyst to establish equilibria such as CH3OH═CO+2H2 and CO+H2O═CO2+H2, which depolymerizes lignin and cellulose, hydrogenates oxygenated aromatic rings, and converts biomass into soluble materials and synthesis gas, reducing char formation and eliminating the need for separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pyrolysis or gasification is used to convert biomass to liquid or gaseous products, then the process is simple and produces ready-to-go products, but significant char is formed which is cumbersome and problematic
Solution Approach 1:
The patent introduces water as an intermediary substance that reacts with biomass at subcritical conditions to produce hydrolyzed sugars and lignin derivatives. This water-mediated hydrolysis pathway avoids the direct thermal decomposition that leads to char formation, while still enabling conversion to liquid fuels and chemicals.
Solution Approach 2:
The patent operates at subcritical water conditions (temperatures below the critical point of water at 374°C and pressures below 22.1 MPa), which fundamentally changes the reaction pathway compared to pyrolysis or gasification. This parameter change enables selective hydrolysis of biomass components while preventing excessive char formation through controlled water-gas shift reactions.
2Quantity of substance
If hydrolysis is used to convert cellulose and hemicellulose to fermentable sugars, then sugars are produced, but water must be separated from the final product and aryl ether bonds are resistant to hydrolysis
Solution Approach 1:
The patent converts the presence of water, which would normally require separation, into a beneficial reactant. Water participates in hydrolysis reactions and water-gas shift reactions to produce hydrogen and liquid fuel products directly in the aqueous phase, eliminating the need for energy-intensive water removal steps.
Solution Approach 2:
The reaction system is designed to produce hydrogen in situ through water-gas shift reactions using the water already present in the system. This self-generated hydrogen then participates in subsequent reduction reactions to form liquid fuels, making the water both a solvent and a reactant that serves multiple functions without requiring separation.
3Loss of substance
If catalytic conversion with methanol is used to establish equilibria CH3OH═CO+2H2 and CO+H2O═CO2+H2, then char formation is reduced and separation is eliminated, but the process complexity increases
Solution Approach 1:
The patent combines multiple functions into a single catalytic system that simultaneously performs: (1) biomass hydrolysis, (2) methanol decomposition to CO and H2, (3) water-gas shift to generate additional hydrogen, and (4) in-situ hydrogenation of intermediates. This consolidation eliminates char formation and avoids separation steps despite the increased reaction complexity.
Solution Approach 2:
The catalyst system is designed to be multi-functional, enabling it to catalyze different types of reactions (hydrolysis, decomposition, water-gas shift, hydrogenation) under the same reaction conditions. This universal catalytic approach handles the complexity of converting recalcitrant biomass to liquid fuels while maintaining a relatively simple single-step process configuration.
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 method achieves efficient conversion of biomass into internal combustion engine-ready fuels and chemicals with minimal char formation, reducing the demand for petroleum-derived products and emissions, and regenerating energy from cellulose.
Implementation Method 1
at least one catalyst that establishes one or both of the following equilibria: a) CH3OH═CO+2H2; b) CO+H2O═CO2+H2
Implementation Method 2
CO+H2O═CO2+H2
Implementation Method 3
act to depolymerize lignin and/or lignocellulose in the biomass by aryl ether hydrogenolysis
Implementation Method 4
act on the reaction products to hydrogenate oxygenated aromatic rings
Implementation Method 5
dehydrate and hydrogenate reaction products to produce chemical compounds such as methane and alkylcyclohexanols with concomitant loss of water
Implementation Method 6
methanol at temperatures in excess of its critical temperature Tc=240° C.) is used as a solvent and source of the reducing gases hydrogen and carbon monoxide
Implementation Method 7
act to extensively dehydrate and hydrogenate the reaction products to produce chemical compounds such as isomers of pentanol and hexanol with concomitant loss of water
Implementation Method 8
Dehydration of lignin-, cellulose-, hemicellulose-, and lignocellulose-derived chemicals and materials produces unsaturated intermediates, and the unsaturated intermediates are rapidly hydrogenated, preventing over-dehydration of the materials and chemicals to char
Data Source
AI summary
A method of catalytically preparing a fluid product from solid carbonaceous material is described. In the method, at least one of the following equilibria is established by one or more catalysts: a) CH3OH═CO+2H2, b) CO+H2O═CO2+H2. In some versions, the solid carbonaceous material is woody biomass. Components of the fluid product can include one or a combination of C5-C9 alcohols. In certain versions, the method can he practiced with substantially all of the carbon in the carbonaceous material being converted to the fluid product. Also, in some versions, the fluid product can be prepared with substantially no char formation. The fluid product of various versions can be used directly as fuel or as a reagent for preparing commodity chemicals without the need for separating the fluid product components.