Self-Bound Hybrid Catalysts for Stable C2-C4 Hydrocarbon Yield
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Solution Overview
Problem
Conventional catalysts with inactive binders suffer from low carbon conversion and stability issues due to dilution of active components and migration of dopants, leading to reduced production of C2 to C4 hydrocarbons.
Innovation Solution
The preparation of self-bound hybrid catalysts using a zirconia-based binder and microporous catalyst components, where the binder and support are the same material, prevents dopant migration and enhances long-term stability, allowing direct conversion of syngas to C2 to C4 hydrocarbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an inactive binder is used in hybrid catalysts to provide structural stability, then the catalyst maintains its shape and mechanical strength, but the active components are diluted and dopant migration occurs, reducing carbon conversion efficiency and long-term stability
Solution Approach 1:
The invention removes the inactive binder component from the catalyst formulation entirely. Instead, it uses a self-binding mechanism where the metal oxide support particles bind to each other through controlled aggregation and sintering processes, creating a binder-free hybrid catalyst structure that eliminates dopant migration while maintaining structural integrity
Solution Approach 2:
The metal oxide support performs dual functions: it serves as both the structural framework and the binding agent for the microporous catalyst component. The support particles self-assemble and bind together through thermal treatment, creating a stable structure without requiring external inactive binders, thereby preventing dopant migration and maintaining high carbon conversion efficiency
2Strength
If an inactive binder is used to hold catalyst components together, then the catalyst maintains structural integrity, but the concentration of active components is diluted, reducing productivity
Solution Approach 1:
The invention extracts and eliminates the inactive binder from the catalyst system, allowing the active metal oxide support and microporous catalyst components to constitute nearly 100% of the catalyst volume, thereby maximizing the concentration of active sites and hydrocarbon production capability while maintaining structural integrity through self-binding mechanisms
Solution Approach 2:
The invention creates a composite catalyst structure where metal oxide support particles and microporous catalyst components are intimately mixed and bound together through thermal treatment, forming a binder-free composite material with high active component concentration and enhanced structural integrity
3Ease of manufacture
If conventional hybrid catalysts with inactive binders are used, then the catalyst can be loaded into reactors in shaped form, but the catalyst rapidly loses activity over time due to dopant migration and low stability
Solution Approach 1:
The invention removes the inactive binder that causes dopant migration, replacing it with a thermal binding process where metal oxide support particles sinter and bind to each other and to the microporous catalyst component, creating a stable shaped catalyst structure that maintains its form while preventing dopant migration and preserving activity over time
Solution Approach 2:
The invention employs thermal treatment parameters (temperature, time, atmosphere) to transform the physical and chemical properties of the catalyst components, inducing sintering and binding of metal oxide support particles while simultaneously preventing dopant migration and enhancing long-term catalyst stability in the desired shaped form
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 self-bound hybrid catalysts achieve high and steady yield of C2 to C4 hydrocarbons by closely coupling reactions, maintaining catalyst activity over time, and improving carbon conversion efficiency.
Implementation Method 1
The binder component may comprise a zirconium salt solution, a zirconium salt gel, a zirconium salt slurry, a slurry of carbonates or oxides or hydroxides of zirconium or a colloidal solution of carbonates or oxides or hydroxides of zirconium
Implementation Method 2
The impregnation solution comprises a solution comprising one or more dopants that introduces the dopant or dopants onto the hybrid base catalyst support
Implementation Method 3
The self-bound hybrid catalyst can then be used for the direct conversion of a feed stream comprising hydrogen gas and a carbon-containing gas, such as syngas, to C2 to C4 hydrocarbons
Data Source
AI summary
According to embodiments, a method for preparing a self-bound hybrid catalyst may comprise mixing a powder mixture and a binder component to form a hybrid base catalyst and adding an impregnation solution comprising gallium to the hybrid base catalyst to form the self-bound hybrid catalyst after drying and calcination. According to embodiments, a process for preparing C2 to C4 hydrocarbons may comprise introducing a feed stream comprising hydrogen gas and a carbon-containing gas selected from the group consisting of carbon monoxide, carbon dioxide, and mixtures thereof into a reaction zone of a reactor and converting the feed stream into a product stream comprising C2 to C4 hydrocarbons in the reaction zone in the presence of a self-bound hybrid catalyst formed according to the methods described herein.