Hydrocracking Catalyst Preparation via Ammonium Salt Mediation
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Solution Overview
Problem
Current hydrocracking catalysts exhibit poor performance due to uneven distribution of hydrogenation metals, leading to inadequate hydrocracking activity.
Innovation Solution
A process involving the use of an aqueous solution with an ammonium salt to deposit hydrogenation metals onto a shaped body comprising a zeolite and a binder, ensuring uniform distribution and proximity of the metal to the zeolite acid sites, thereby enhancing catalyst performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an aqueous solution of hydrogenation metal compound is used to deposit metal onto the shaped body, then the metal deposition process is simple, but the metal distribution becomes uneven between outer surface and inner body
Solution Approach 1:
An ammonium salt is introduced as an intermediary substance in the aqueous solution to mediate the deposition of hydrogenation metal. The ammonium salt modifies the solution chemistry to prevent preferential surface deposition, enabling uniform metal distribution throughout the shaped body while maintaining the simplicity of the aqueous deposition process
2Productivity
If hydrogenation metal is deposited mainly on the outer surface of the extrudate, then the deposition process is efficient, but the catalyst performance deteriorates due to poor metal distribution
Solution Approach 1:
The ammonium salt acts as a mediating agent that redistributes the hydrogenation metal deposition throughout the extrudate. It prevents the metal from concentrating only on the outer surface by modifying the deposition mechanism, thereby achieving both efficient deposition and uniform distribution for optimal catalyst performance
3Device complexity
If the hydrogenation metal is not in close proximity to the zeolite acid sites, then the catalyst structure is simple, but the hydrocracking activity is insufficient
Solution Approach 1:
The deposition process is optimized to achieve local concentration of hydrogenation metal at specific sites within the shaped body where zeolite acid sites are located. This ensures close proximity between metal and acid sites for high hydrocracking activity while maintaining overall catalyst structural simplicity
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 process results in a hydrocracking catalyst with high activity, achieving optimal benzene yield and low methane production, with improved catalyst durability and efficiency in hydrocracking processes.
Implementation Method 1
contacting a shaped body comprising a zeolite and a binder with an aqueous solution of a hydrogenation metal compound which is a complex or a salt of a hydrogenation metal to deposit the hydrogenation metal onto the shaped body, wherein the aqueous solution comprises an ammonium salt
Data Source
AI summary
The invention relates to a process for preparing a hydrocracking catalyst, comprising (i) contacting a shaped body comprising a zeolite and a binder with an aqueous solution of a hydrogenation metal compound which is a complex or a salt of a hydrogenation metal to deposit the hydrogenation metal onto the shaped body, wherein the aqueous solution comprises an ammonium salt and (ii) calcining the shaped body obtained by step (i).