Nitride Support Fischer-Tropsch Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Fischer-Tropsch synthesis catalysts face challenges with low thermal conductivity, poor hydrothermal stability, and abrasion resistance, leading to reduced catalytic activity and selectivity due to the use of refractory oxides like silica and alumina, which retain reaction heat and are affected by high water partial pressures.
Innovation Solution
A Fischer-Tropsch synthesis catalyst comprising a Group VIIIB metal supported on a boron nitride or silicon nitride carrier with a high specific surface area, enhancing mass and heat transfer, and mechanical strength to improve catalytic activity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If refractory oxides (silica, alumina) are used as catalyst carriers, then mechanical strength is improved, but thermal conductivity deteriorates leading to heat retention and catalyst sintering
Solution Approach 1:
The patent uses carbide materials (such as silicon carbide, silicon nitride, boron carbide, or boron nitride) as catalyst carriers instead of traditional refractory oxides. These carbide materials possess both high mechanical strength and high thermal conductivity, creating a composite effect that simultaneously resolves the contradiction between mechanical strength and heat dissipation. The carbide carrier maintains catalyst structural integrity while efficiently conducting heat away from the active sites, preventing sintering and maintaining catalytic activity.
2Stability of the object's composition
If refractory oxides are used as catalyst carriers, then catalyst structure stability is improved, but hydrothermal stability deteriorates under high water partial pressure
Solution Approach 1:
The patent changes the chemical composition parameter of the catalyst carrier from oxide-based to carbide-based materials. This fundamental parameter change transforms the chemical properties of the carrier, making it resistant to hydrothermal degradation. Carbide materials maintain their structural stability and chemical inertness under high water partial pressure conditions, preventing the carrier transformation and catalyst deactivation that occur with traditional oxide carriers in hydrothermal environments.
3Ease of manufacture
If conventional carriers are used, then catalyst preparation is simplified, but mass transfer efficiency and heat transfer deteriorate
Solution Approach 1:
The patent employs carbide materials with optimized porous structures as catalyst carriers. The porous structure provides high specific surface area for catalyst dispersion while maintaining excellent mass and heat transfer properties. The pore network facilitates efficient diffusion of reactants and products, while the high thermal conductivity of the carbide material ensures effective heat dissipation. This porous carbide structure achieves both ease of catalyst preparation and superior mass/heat transfer efficiency.
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 exhibits increased catalytic activity, long-period stability, and high selectivity for C5+ hydrocarbons, maintaining activity and stability under harsh reaction conditions, outperforming conventional catalysts with low specific surface area carriers.
Implementation Method 1
the poor thermal conductivity of the catalyst may cause a retention of a large amount of reaction heat in the catalyst particles during the reaction... It is very important to promptly remove a large amount of reaction heat released from the inside of the catalyst particles
Implementation Method 2
Syngas, which is a mixed gas containing CO, H2, and a small amount of CO2, methane and N2, can be converted into hydrocarbon compounds under the action of catalysts. This reaction is referred to as the Fischer-Tropsch synthesis reaction, and the Group VIIIB transition metals, such as iron, cobalt, nickel, and ruthenium, are the active components of the catalysts commonly used in this reaction
Data Source
AI summary
Disclosed are a Fischer-Tropsch synthesis catalyst, a preparation method therefor and use thereof in a Fischer-Tropsch synthesis reaction. Wherein the catalyst comprises: an active component, being at least one selected from VIIIB transition metals; an optional auxiliary metal; and a nitride carrier having a high specific surface area. The catalyst is characterized in that the active metal is supported on the nitride carrier having the high specific surface, such that the active component in the catalyst is highly dispersed. The catalyst has a high hydrothermal stability, an excellent mechanical wear resistance, a high Fischer-Tropsch synthesis activity and an excellent high-temperature stability.