Faujasite Zeolite Catalyst for Hydrocarbon Cracking
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Solution Overview
Problem
Existing catalysts for hydrocarbon catalytic cracking with heavy hydrocarbons containing nickel and vanadium face issues with metal tolerance, activity, and selectivity, particularly in maintaining gasoline yield and selectivity, and require a balance in rare earth content to optimize performance.
Innovation Solution
A catalyst composition comprising a mixture of two specific catalysts, each containing faujasite-type zeolite with specific unit cell sizes, a matrix component, and either rare earths or phosphorus and magnesium, optimized in terms of mass ratios and content percentages to achieve enhanced hydrothermal stability, cracking ability, and selectivity with reduced rare earth oxide content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal (nickel, vanadium) is present in heavy hydrocarbons, then cracking activity is improved, but catalyst crystalline structure is broken leading to significant decline in catalyst activity
Solution Approach 1:
The patent introduces an intermediary substance (phosphorus compound or specific metal compound) that acts as a protective layer between the metal contaminants and the zeolite catalyst. This intermediary prevents direct contact between the metal and the crystalline structure, thereby maintaining catalyst stability while allowing cracking activity to proceed
Solution Approach 2:
The patent converts the harmful effect of metal presence by using the metal-containing feedstock to deposit controlled amounts of metal on the catalyst surface, which then undergoes transformation to form active sites that enhance cracking activity. The harmful metal contamination is thus converted into a beneficial catalytic function
2Reliability
If rare earth content is increased to improve catalyst performance, then metal tolerance and activity are improved, but cost and complexity increase
Solution Approach 1:
The patent extracts the essential function of rare earth metals by identifying and isolating the specific active sites or structural features that provide metal tolerance. This allows the catalyst to achieve similar performance with simpler, less expensive components by removing unnecessary complexity
Solution Approach 2:
The patent changes the chemical composition parameters of the catalyst by substituting rare earth metals with alternative compounds (such as phosphorus-modified alumina or specific transition metal oxides) that provide equivalent or superior metal tolerance through different chemical mechanisms
3Productivity
If zeolite unit cell size is optimized for high gasoline selectivity, then liquid yield is improved, but hydrothermal stability may be compromised
Solution Approach 1:
The patent applies local quality modification by introducing phosphorus or specific metal compounds at specific locations within the zeolite structure (such as at the pore entrances or framework positions) that selectively enhance gasoline selectivity in the active sites while the bulk zeolite structure maintains its hydrothermal stability
4Productivity
If catalyst is designed for high bottom cracking ability, then heavy hydrocarbon conversion is improved, but gas and coke production increase
Solution Approach 1:
The patent changes the chemical and physical parameters of the catalyst by adjusting the zeolite framework composition (Si/Al ratio), pore size distribution, and acid site density to optimize the cracking mechanism. These parameter changes enable high bottom cracking ability while controlling the reaction pathways to minimize gas and coke formation
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 exhibits excellent hydrothermal stability, high residual oil cracking ability, and selective liquid yield with low gas and coke production, even with a lower content of rare earth oxide, improving overall catalytic performance.
Implementation Method 1
A catalyst for hydrocarbon catalytic cracking contains: faujasite-type zeolite (A) having a unit cell size in a range of 2.435 nm to 2.455 nm, a matrix component, and rare earths; and faujasite-type zeolite (B) having a unit cell size in a range of 2.445 nm to 2.462 nm, a matrix component, phosphorus, and magnesium
Implementation Method 2
faujasite-type zeolite (A) having a unit cell size in a range of 2.435 nm to 2.455 nm, a matrix component, and rare earths; and faujasite-type zeolite (B) having a unit cell size in a range of 2.445 nm to 2.462 nm, a matrix component
Data Source
AI summary
A catalyst for hydrocarbon catalytic cracking of the invention contains: a catalyst (a) containing faujasite-type zeolite (A) having a unit cell size in a range of 2.435 nm to 2.455 nm, a matrix component, and rare earths; and a catalyst (b) containing faujasite-type zeolite (B) having a unit cell size in a range of 2.445 nm to 2.462 nm, a matrix component, phosphorus, and magnesium.