Platinum-Palladium Bimetallic Catalyst Jet Fuel Yield
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Solution Overview
Problem
Current hydrocracking catalysts face challenges in achieving improved conversion and yield of desired distillate products, particularly in second-stage hydrocracking processes, with limitations in capital and operating costs, and flexibility in using alternative catalysts for distillate fuels production.
Innovation Solution
A bimetallic platinum-palladium hydrocracking catalyst comprising a base material of alumina, amorphous silica-alumina, and Y zeolite, with catalytically active platinum and palladium metals dispersed on or impregnated within, is developed, along with a process involving extrusion, impregnation, and calcination to enhance catalyst performance and jet fuel yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hydrocracking catalysts are used, then the process is simpler and costs are lower, but the jet fuel yield and sulfur tolerance are insufficient
Solution Approach 1:
The patent employs a bimetallic catalyst comprising both platinum and palladium metals deposited on a support material. This composite catalyst structure combines the benefits of both metals: platinum provides high catalytic activity for hydrocracking reactions while palladium enhances sulfur tolerance. The synergistic interaction between the two metals achieves superior jet fuel yield and sulfur resistance compared to conventional single-metal catalysts, directly resolving the technical contradiction between productivity improvement and device complexity acceptance.
Solution Approach 2:
The catalyst design incorporates different metals at different functional locations within the catalyst structure. Platinum is primarily distributed to provide hydrocracking activity on the external surface, while palladium is positioned to provide sulfur tolerance throughout the catalyst. This localized functional distribution optimizes performance for each metal's strengths, achieving high jet fuel yield while managing the complexity through targeted metal placement rather than uniform distribution.
2Reliability
If conventional single-metal catalysts are used, then the catalyst structure is simpler and cost is lower, but sulfur tolerance is insufficient
Solution Approach 1:
The bimetallic catalyst combines platinum and palladium in specific ratios (typically Pd:Pt from 1:4 to 4:1) to achieve synergistic effects. Palladium specifically enhances sulfur tolerance by resisting sulfur poisoning, while platinum maintains high hydrocracking activity. This composite structure resolves the contradiction by integrating two metals that complement each other's weaknesses, achieving reliable sulfur tolerance without requiring overly complex multi-component systems.
Solution Approach 2:
The catalyst design converts the presence of sulfur, which is typically harmful to catalyst activity, into a manageable condition through palladium's inherent sulfur tolerance. Palladium acts as a protective component that withstands sulfur exposure, allowing the catalyst to maintain performance in sulfur-containing feedstocks. This transforms the harmful effect of sulfur into a condition that the bimetallic catalyst can reliably handle, resolving the contradiction between reliability improvement and structural complexity.
3Productivity
If higher metal loading is used to improve activity, then hydrocracking activity increases, but capital and operating costs increase
Solution Approach 1:
The patent optimizes the metal loading parameters by using a bimetallic system with specific Pt and Pd ratios rather than increasing the loading of a single metal. The synergistic interaction between platinum and palladium allows for lower total noble metal content while maintaining or enhancing hydrocracking activity. This parameter optimization resolves the contradiction by achieving high productivity through efficient metal utilization rather than simply increasing metal quantity, thereby reducing capital and operating costs.
Solution Approach 2:
The bimetallic catalyst uses the complementary properties of platinum (high activity) and palladium (sulfur tolerance and stability) to achieve high hydrocracking activity at lower total metal loadings. The synergistic effect means that less total noble metal is required compared to using platinum alone at higher loadings, thus reducing the quantity of expensive substances needed while maintaining high productivity and reducing costs.
4Adaptability or versatility
If conventional catalysts are used, then flexibility in catalyst selection is limited, but the process is more straightforward
Solution Approach 1:
The bimetallic catalyst design provides multi-functionality by combining hydrocracking activity (from platinum) and sulfur tolerance (from palladium) in a single catalyst system. This universal catalyst can handle various sulfur-containing feedstocks and produce different product distributions by adjusting the Pd:Pt ratio, offering flexibility in catalyst selection and application without requiring multiple specialized catalysts. The system achieves adaptability while managing complexity through a unified bimetallic approach rather than multiple separate catalyst systems.
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 bimetallic catalyst provides increased jet fuel yield and greater sulfur tolerance compared to non-bimetallic catalysts, while maintaining comparable hydrocracking activity and product selectivity, thus addressing the limitations of existing catalysts in terms of cost and flexibility.
Implementation Method 1
A hydrocracking catalyst comprising a base material of an alumina, an amorphous silica-alumina, and a Y zeolite; and a bimetallic platinum-palladium modifier metal composition dispersed on and/or impregnated within the base material
Implementation Method 2
contacting the extruded base material with an impregnation solution comprising an optionally pH buffered aqueous solution comprising platinum and palladium, and/or platinum and/or palladium precursor compounds thereto
Implementation Method 3
calcining the dried base material
Data Source
AI summary
Bimetallic platinum-palladium hydrocracking catalysts are disclosed. The bimetallic catalyst generally comprises a base material comprising an alumina, an amorphous silica-alumina, and a Y zeolite, and a bimetallic platinum-palladium modifier metal composition dispersed on and/or impregnated within the base material. The catalyst is useful as a hydrocracking catalyst for hydrocarbon feedstocks, including as a second stage catalyst to produce fuels, and more particularly to produce higher yields of jet fuels.