USY Zeolite Catalyst for Light Olefin Yield
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Solution Overview
Problem
Current catalytic cracking processes for hydrocarbon streams struggle to maximize the yield of light olefins, particularly with paraffinic feedstocks, and none utilize catalyst compositions with high silica/alumina (>40) ratio Y zeolite for efficient production.
Innovation Solution
A catalyst composition comprising high silica/alumina ratio USY zeolite, medium pore pentasil zeolite (ZSM-5 or ZSM-11), a phosphate compound, and an alumina silica binder, optionally impregnated with cerium oxide, is used for catalytic cracking of hydrocarbon streams to enhance light olefin yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional catalyst compositions are used for catalytic cracking, then the process is simple and easy to operate, but the yield of light olefins is limited and cannot be maximized
Solution Approach 1:
The patent employs a composite catalyst system combining USY zeolite with high silica/alumina ratio (>40), medium pore pentasil zeolite, phosphate compound, and alumina silica binder. This composite structure synergistically enhances light olefin yield (up to 50 wt.%) while managing the complexity through defined composition ratios and preparation methods
Solution Approach 2:
The patent optimizes specific parameters including silica/alumina ratio of USY zeolite (>40), pore size distribution (medium pore for pentasil, large pore for USY), and additive concentrations (phosphate compound 0.1-5 wt.%, cerium oxide 0.1-5 wt.%). These parameter optimizations maximize light olefin production while controlling catalyst complexity
2Productivity
If high silica/alumina ratio USY zeolite is used to enhance light olefin yield, then olefin production increases, but catalyst preparation becomes more complex and costly
Solution Approach 1:
The patent specifies precise parameter ranges for ease of manufacture: USY zeolite with silica/alumina ratio >40, pentasil zeolite content 5-40 wt.%, phosphate compound 0.1-5 wt.%, and cerium oxide 0.1-5 wt.%. These defined parameters standardize the manufacturing process while achieving high light olefin yields
Solution Approach 2:
The phosphate compound and alumina silica binder serve as intermediaries that facilitate the integration of high silica/alumina USY zeolite with pentasil zeolite. These intermediaries simplify the manufacturing process by providing a structured framework for catalyst preparation while enhancing the overall catalytic performance
3Reliability
If cerium oxide is incorporated to improve acid strength and dehydrogenation effects, then catalytic performance enhances, but the catalyst composition and processing become more complex
Solution Approach 1:
The patent optimizes cerium oxide content at 0.1-5 wt.% to enhance acid strength and dehydrogenation effects. This controlled addition improves catalytic reliability for light olefin production while limiting complexity through defined concentration ranges and standardized impregnation procedures
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 composition achieves higher light olefin yields, up to 50 wt.%, compared to traditional catalysts, with improved acid strength and dehydrogenation effects when cerium is incorporated, effectively cracking a wide range of hydrocarbon fractions.
Implementation Method 1
catalytic cracking of hydrocarbon streams to produce light olefins
Implementation Method 2
improved acid strength and dehydrogenation effects when cerium is incorporated
Data Source
AI summary
The present invention relates to a novel catalyst composition for catalytic cracking of hydrocarbon streams to enhance the yield of light olefins. The catalyst composition for the cracking of hydrocarbon feed streams to light olefins, comprises a USY zeolite with silica/alumina ratio of more than 40, pentasil zeolite, a phosphate compound and alumina silica binder. The yield of olefins is further increased when the catalyst composition is impregnated with a cerium oxide. The present invention also provides a process of increasing the yield of light olefins from hydrocarbon feed streams comprising contacting the hydrocarbon streams with catalyst compositions of the present invention.