Cu-Mg Carbonized Wood Sponge Catalyst for Mild Plastic-to-Fuel Conversion
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Solution Overview
Problem
Conventional methods for converting plastic waste into fuel are inefficient, energy-intensive, and produce environmental pollution, while existing advanced oxidation processes struggle to effectively degrade plastics due to their high molecular weights.
Innovation Solution
A copper-magnesium co-doped carbonized wood sponge material is prepared by impregnating wood with polydopamine, metal salts, and 2-methylimidazole, followed by freeze-drying and calcination, creating a catalyst that activates persulfate to generate reactive species for converting plastics into hydrocarbon and oxygen-containing fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional thermal treatment is used to convert plastic waste into fuel, then the fuel has higher calorific value and performance close to gasoline and diesel, but the process requires high temperature, long reaction time, and produces pipe clogging and environmental pollution
Solution Approach 1:
The invention changes the reaction parameters from high-temperature thermal treatment to mild-temperature Fenton-like oxidation. The copper-magnesium co-doped carbonized wood sponge catalyst enables the reaction to proceed at lower temperatures with shorter time, reducing energy consumption while maintaining high conversion efficiency through catalytic action
Solution Approach 2:
The invention employs Fenton-like oxidation using copper-magnesium co-doped carbonized wood sponge as catalyst, which generates highly reactive hydroxyl radicals. This strong oxidation system accelerates the degradation of plastic waste into fuel components under mild conditions, avoiding the need for high-temperature thermal treatment
2Productivity
If advanced oxidation processes are used to convert plastic waste, then the reaction occurs under relatively mild conditions with reduced energy consumption, but the process struggles to effectively degrade plastics due to their high molecular weights
Solution Approach 1:
The invention uses a composite catalyst system combining copper and magnesium dopants in carbonized wood sponge structure. This composite material provides multiple active sites for radical generation and enhances the overall catalytic activity, enabling effective degradation of high molecular weight plastics under mild oxidation conditions
Solution Approach 2:
The carbonized wood sponge structure provides localized porous regions with high surface area and distributed active sites. The copper and magnesium dopants create localized zones of high catalytic activity within the sponge matrix, enhancing the ability to attack and degrade plastic polymer chains at multiple points simultaneously
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 catalyst achieves an 80% conversion rate of polypropylene plastics into valuable fuel products, with a high yield of chain hydrocarbons and oxygen-containing compounds, and is recyclable, addressing the inefficiencies of previous methods.
Implementation Method 1
method for converting plastics into fuel based on a Fenton-like system
Implementation Method 2
generation of reactive species with high standard reduction potentials, such as sulfate radicals (SO4·−, E0=3.1 V vs normal hydrogen electrode (NHE)) and hydroxyl radicals (·OH, E0=2.7 V vs NHE)
Implementation Method 3
compounding a wood raw material with a dopamine solution, and performing polymerization to obtain a wood material attached with polydopamine (PDA)
Implementation Method 4
performing calcination of the freeze-dried material to obtain a copper-magnesium co-doped carbonized wood sponge material
Implementation Method 5
performing pre-freezing treatment and freeze-drying treatment of an obtained material
Data Source
AI summary
The present disclosure provides a copper-magnesium co-doped carbonized wood sponge material, a preparation therefor, and an application thereof, and a method for converting plastics into fuel based on a Fenton-like system. In the present disclosure, a copper-magnesium co-doped carbonized wood sponge catalyst is prepared by high-temperature pyrolysis after a wood raw material is coated with polydopamine (PDA) and a copper element and a magnesium element are loaded on a wood sponge substrate, realizing the loading of a nanoreactor on a wood sponge layered structure, and forming a unique spatial microenvironment and synergistic effect by combining a superior three-dimensional lamellar structure of the wood sponge substrate with the structural advantages of the nanoreactor to promote an electron transfer pathway on a surface.