Clay-Free FCC Catalyst Using Alumina and Silica Binders
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
FCC catalysts are prone to poisoning by contaminants like iron and calcium, leading to surface blockage and reduced performance, particularly when processing feedstocks with high Fe/Ca content, which affects their accessibility and bottoms upgrading ability.
Innovation Solution
An essentially clay-free FCC catalyst composition is developed, utilizing alumina-based components instead of clay to inhibit the formation of low melting eutectic phases with contaminants, combined with binder silicas to enhance attrition resistance and contaminant tolerance, comprising one or more zeolites, multiple alumina types, and silica components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If clay is used as a binder in FCC catalyst, then attrition resistance is improved, but contaminant resistivity deteriorates due to formation of low melting eutectic phases
Solution Approach 1:
The patent removes clay from the catalyst composition entirely, replacing it with alternative binders such as silica and alumina. This extraction of the problematic clay component eliminates the source of low melting eutectic phase formation while maintaining the necessary binding function through alternative materials that do not suffer from contaminant poisoning.
Solution Approach 2:
The patent employs a composite binder system consisting of multiple components (silica, alumina, and other inorganic materials) to replace the single clay binder. This composite approach provides both the required mechanical strength for attrition resistance and chemical stability against contaminants, as the composite materials work synergistically to prevent eutectic phase formation while maintaining structural integrity.
2Strength
If clay is used in catalyst composition, then particle strength is improved, but accessibility of active sites deteriorates due to surface blockage
Solution Approach 1:
By removing clay from the catalyst formulation, the patent eliminates the substance that causes surface blockage and accessibility loss. The alternative binder system provides mechanical strength without the harmful surface blocking effects, thereby maintaining both particle integrity and active site accessibility.
Solution Approach 2:
The patent utilizes porous inorganic binder materials that provide structural strength while maintaining open pore structures. These porous materials allow reactant molecules to access active sites effectively while still providing the mechanical framework necessary for particle strength, thus resolving the contradiction between strength and accessibility.
3Ease of manufacture
If traditional FCC catalyst with clay is used, then manufacturing simplicity is maintained, but bottoms upgrading ability deteriorates due to catalyst poisoning
Solution Approach 1:
The patent employs a composite inorganic binder system that, while slightly more complex in composition than traditional clay, provides superior performance in bottoms upgrading. The composite materials (silica, alumina, and other inorganics) work together to resist contaminant poisoning, thereby maintaining catalytic activity and productivity for converting heavy molecules into valuable products.
Solution Approach 2:
The patent changes the chemical composition parameters of the binder from clay-based to clay-free inorganic materials. This parameter change fundamentally alters the catalyst's interaction with contaminants, preventing the deactivation that would otherwise reduce bottoms upgrading ability, while the manufacturing process remains relatively straightforward.
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 improved iron tolerance and retention of accessibility, resulting in enhanced bottoms upgrading performance and attrition resistance, allowing for the processing of cheaper high Fe/Ca containing feedstocks with increased efficiency.
Implementation Method 1
utilizing alumina-based components instead of clay to inhibit the formation of low melting eutectic phases with contaminants
Implementation Method 2
a particulate FCC catalyst composition comprising one or more zeolites, at least one alumina component, at least one silica component
Implementation Method 3
combined with binder silicas to enhance attrition resistance and contaminant tolerance
Data Source
AI summary
Process for the preparation of a particulate FCC catalyst and a particulate FCC catalyst increased contaminants resistivity being essentially free of clay. Thus, in one embodiment, provided is a particulate FCC catalyst composition comprising one or more zeolites, at least one alumina component, at least one silica component, and being essentially free of clay. In a further embodiment, it is provided a particulate FCC catalyst composition comprising at least two different types of alumina and at least one silica component and being essentially free of clay. The alumina components can be selected from the group of peptizable quasicrystalline boehmite, non-peptizable microcrystalline boehmite phase, non-peptizable alpha phase or non-peptizable alumina containing gamma phase or non-peptizable alumina containing chi phase or gibbsite alumina. The silica component can be selected from the group of low sodium stabilized colloidal silica and acid or low sodium or ammonia stabilized colloidal silica or ploy silicic acid.