Tri-Metallic Steamed Biochar Catalyst for Hydrogen and Nanotube Production
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Solution Overview
Problem
Current methods for hydrogen production from methane, such as steam reforming and thermal decomposition, face challenges including high greenhouse gas emissions, catalyst degradation, and uncontrollable carbon product formation, necessitating a more efficient and environmentally friendly process.
Innovation Solution
A catalyst composition comprising steamed biochar and a tri-metallic catalyst with nickel, copper, and zinc loadings of 20-60 wt%, 0.5-5.0 wt%, and 0.5-5.0 wt% respectively, which is prepared by heating raw biochar with steam and impregnating the tri-metallic catalyst on the steamed biochar followed by calcination, allowing for the production of hydrogen and carbon nanotubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If steam reforming of methane is used for hydrogen production, then hydrogen can be produced, but large quantity of carbon dioxide is released and additional purification steps are required
Solution Approach 1:
The invention converts the harmful carbon dioxide byproduct of steam reforming into useful carbon nanotubes through catalytic transformation. The carbon that would otherwise be waste or harmful emission is transformed into a valuable product, eliminating the harmful effect while maintaining hydrogen production.
Solution Approach 2:
The invention changes the reaction parameters and pathway from conventional steam reforming to catalytic decomposition using a specific tri-metallic catalyst system. This parameter change transforms the reaction to produce hydrogen with carbon nanotubes as the carbon product instead of carbon dioxide, resolving the emission problem.
2Object-generated harmful factors
If thermal decomposition of methane is used for hydrogen production, then greenhouse gas emissions are reduced, but temperatures of over 1300° C. are required
Solution Approach 1:
The invention introduces a tri-metallic catalyst (nickel-copper-zinc) as an intermediary substance that mediates the methane decomposition reaction. This catalyst enables the reaction to proceed at lower temperatures (600-800° C.) by providing an alternative reaction pathway with lower activation energy, thus avoiding the need for extreme temperatures while maintaining low greenhouse gas emissions.
Solution Approach 2:
The invention changes the temperature parameter from over 1300° C. to 600-800° C. by implementing catalytic decomposition. This parameter change is achieved through the use of the tri-metallic catalyst system, which lowers the activation energy requirement and enables the reaction to occur at milder conditions.
3Quantity of substance
If conventional catalysts are used for methane decomposition, then hydrogen production is achieved, but catalyst life is short and carbon products cannot be controlled
Solution Approach 1:
The invention uses a composite tri-metallic catalyst system comprising nickel, copper, and zinc metals supported on steamed biochar. This composite structure combines the advantages of multiple metals and a stable support material, resulting in enhanced catalyst durability, resistance to deactivation, and controlled carbon product formation, thereby extending catalyst life significantly.
Solution Approach 2:
The invention applies local quality by distributing the three different metals (nickel, copper, zinc) in specific proportions (20-60 wt% Ni, 0.5-5.0 wt% Cu, 0.5-5.0 wt% Zn) on the biochar support. Each metal contributes specific properties: nickel for catalytic activity, copper for stability, and zinc for controlling carbon morphology. This localized composition optimization enhances both catalyst life and carbon product control.
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 composition achieves high selectivity for hydrogen production with minimal carbon dioxide emissions, maintaining catalyst activity, and facilitates the separation of high-purity carbon nanotubes, reducing operational costs and energy consumption.
Implementation Method 1
contacting at least one gaseous hydrocarbon and the catalyst composition of claim 1 to obtain a mixture and hydrogen gas
Implementation Method 2
heating a raw biochar with steam to obtain at least one steamed biochar
Implementation Method 3
a thermal decomposition of methane, also called thermal cracking of methane. This method provides the thermal decomposition of methane to solid carbon and hydrogen
Data Source
AI summary
The present disclosure discloses a catalyst composition comprising: (a) at least one steamed biochar; and (b) at least one tri-metallic catalyst, comprising metals selected from the group consisting of nickel, copper, zinc, and combinations thereof, wherein nickel loading is in the range of 20-60 wt %, the copper loading is in the range of 0.5-5.0 wt %, and the zinc loading is in the range of 0.5-5.0 wt with respect to the at least one steamed biochar. The instant disclosure further relates to a process of preparation of the catalyst composition and a process for production of hydrogen gas and carbon nanotubes.