Vanadium Traps for FCC Catalysts Using Rare Earth and Magnesium Salts
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Solution Overview
Problem
Current catalytic cracking catalysts face challenges in effectively trapping vanadium species, leading to increased production of hydrogen and coke, which deactivates the catalyst and reduces gasoline yields, especially when processing heavy and high-sulfur crude oils.
Innovation Solution
A metal trap is developed using pre-formed microspheres impregnated with an organic acid salt of a rare earth element and a salt of calcium and/or magnesium, which enhances the trapping and passivation of vanadium, mitigating its detrimental effects by increasing the tolerance against sulfur poisoning and improving the catalyst's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional alumina traps are used to trap vanadium, then vanadium trapping is achieved, but sulfur blocks active sites making the traps less effective
Solution Approach 1:
The patent combines rare earth elements (such as lanthanum, cerium, or neodymium) with calcium and/or magnesium salts to create a composite metal trap material. This composite structure synergistically enhances vanadium trapping capability while providing sulfur resistance, where the rare earth elements form stable vanadates and the calcium/magnesium components resist sulfur poisoning, maintaining trap effectiveness in high-sulfur environments
Solution Approach 2:
The patent modifies the chemical composition parameters of the metal trap by incorporating specific ratios of rare earth elements (0.1-20 wt%), calcium (0.1-20 wt%), and magnesium (0.1-20 wt%). These parameter changes optimize the balance between vanadium affinity and sulfur resistance, transforming the trap's performance characteristics to withstand sulfur-containing feedstocks
2Productivity
If heavy and high sulfur crudes are processed, then feedstock utilization is achieved, but contaminant metals increase leading to catalyst deactivation
Solution Approach 1:
The patent applies preliminary anti-action by incorporating metal traps into the catalyst formulation before processing heavy and high-sulfur crudes. The traps are pre-positioned to capture vanadium and resist sulfur poisoning in advance, preventing catalyst deactivation before it occurs and maintaining stability throughout the feedstock conversion process
Solution Approach 2:
The metal trap acts as an intermediary between the harmful contaminant metals in heavy crude and the active catalyst components. The rare earth elements and calcium/magnesium salts in the trap selectively bind to vanadium and resist sulfur, mediating the interaction to protect the zeolite and matrix components from deactivation while allowing feedstock conversion to proceed
3Reliability
If vanadium traps are incorporated into the catalyst, then vanadium species are trapped, but the complexity of catalyst formulation increases
Solution Approach 1:
The patent merges multiple functions into a single metal trap component by combining rare earth elements with calcium and/or magnesium salts. This unified approach provides both vanadium trapping and sulfur resistance in one formulation step, reducing the need for separate additives and simplifying the overall catalyst composition despite the enhanced functionality
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 solution effectively reduces the yield of hydrogen and coke, improving the catalytic conversion of hydrocarbon feedstocks and extending the catalyst's lifespan by effectively capturing vanadium species, thereby enhancing the overall efficiency of the fluid catalytic cracking process.
Implementation Method 1
These agents combine with the metals and therefore either act as 'traps' or 'sinks' for mobile vanadium species
Data Source
AI summary
A metal trap for an FCC catalyst include pre-formed microspheres impregnated with a salt of calcium and/or magnesium and an organic acid salt of a rare earth element.