Fluidized Catalyst Regeneration with Surface Doping
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Solution Overview
Problem
Traditional methods for producing doped FCC catalysts are inefficient and costly due to the embedding of doping agents within the catalyst matrix, making it difficult to adjust catalyst activity or selectivity in response to varying hydrocarbon feedstock compositions, especially when using marginal quality crude oil with highly variable compositions.
Innovation Solution
The method involves regenerating coked-catalyst particles by removing coke with oxidants and depositing doping agents onto the surface of the catalyst particles during the regeneration process, allowing for selective adjustment of catalyst activity or selectivity by changing the doping agents in the regeneration zone based on feedstock variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If doping agents are uniformly dispersed within the catalyst matrix through traditional multi-step processes, then a uniform highly porous catalyst can be produced, but the doping agent is embedded deep within the catalyst particle making it unavailable to the cracking process
Solution Approach 1:
The doping agent is added to the catalyst during the regeneration process before the catalyst returns to the reactor, ensuring the doping agent is already positioned on the catalyst surface when needed for cracking. This preliminary action eliminates the need for the doping agent to diffuse from deep within the matrix.
Solution Approach 2:
The doping agent is extracted from the traditional pre-mixed catalyst formulation and applied separately during regeneration. This allows the doping agent to be deposited on the external surface rather than being embedded in the matrix, making it immediately available for cracking reactions.
2Adaptability or versatility
If the composition of incoming hydrocarbon feedstock is highly variable, then it may be desirable to adjust the doping agent type or concentration, but with a traditional catalyst the doping agent remains embedded within the catalyst matrix requiring complete replacement of the catalyst charge
Solution Approach 1:
The system transitions from a static catalyst composition (fixed during catalyst charge life) to a dynamic composition that can be adjusted continuously during operation. The doping agent concentration and type can be modified in real-time during regeneration cycles to match changing feedstock requirements.
Solution Approach 2:
Instead of discarding the entire catalyst charge when composition adjustment is needed, the system recycles the catalyst continuously and adjusts the doping agent levels during regeneration. This allows selective removal and replacement of only the doping agent portion while retaining the catalyst support structure.
3Stability of the object's composition
If doping agents are embedded within the catalyst matrix, then catalyst structure stability is maintained, but changing catalysts and doping agents in response to feedstock variations requires complete replacement of the catalyst charge
Solution Approach 1:
The catalyst system is segmented into two functional components: the catalyst support structure (maintained for stability) and the doping agent (adjusted as needed). This segmentation allows the stable catalyst matrix to be retained while only the adjustable doping agent portion is modified during regeneration cycles.
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 approach enables rapid adjustment of catalyst performance by ensuring that doping agents are available on the catalyst surface, reducing the need for frequent catalyst replacements and minimizing waste, thereby improving operational efficiency and reducing costs.
Implementation Method 1
regenerating the coked-catalyst particles by removing coke therefrom with oxidants
Implementation Method 2
depositing doping agents onto the surface of the catalyst particles during the regeneration process
Data Source
AI summary
Systems and methods for producing and using one or more doped catalysts are provided. One or more coked-catalyst particles can be fluidized in the presence of one or more oxidants to provide a fluidized mixture. The coke from the one or more coked-catalyst particles can be removed to provide regenerated catalyst particles within the fluidized mixture. One or more doping agents can be distributed to the fluidized mixture, and the one or more doping agents can be deposited onto the surface of the regenerated catalyst particles to provide a regenerated, doped catalyst particle.