Modified Zeolite Catalyst for FCC Gasoline Isomerization
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Solution Overview
Problem
Existing catalysts for converting paraffins, olefins, and aromatics in FCC gasoline into isoparaffins face issues such as rapid deactivation due to coke formation, undesirable aromatic production, and octane loss during sulfur removal, with limited improvement in porosity and acidity, which affects the quality of the resulting gasoline.
Innovation Solution
A porosity and acidity modified zeolite catalyst comprising noble metals like Pt and Pd, treated with steam and acid, is used to convert paraffins, olefins, and aromatics into isoparaffins, enhancing the octane number and reducing undesirable gases, with a composition optimized for improved surface area, pore volume, and acidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional sulfur removal process is used, then sulfur content is reduced, but octane number is lost
Solution Approach 1:
The patent changes the chemical parameters of the catalyst through dealumination treatment, which modifies the acidity and porosity of the zeolite structure. This parameter change enables the catalyst to simultaneously achieve sulfur removal and octane preservation by creating optimal active sites for selective reactions
Solution Approach 2:
The patent uses a composite catalyst system combining dealuminated zeolite with noble metals (Pt and/or Pd). This composite material integrates the sulfur removal capability of zeolite with the hydrogenation activity of noble metals, achieving both sulfur elimination and octane number maintenance through synergistic effects
2Productivity
If conventional zeolite catalyst is used for hydrocarbon conversion, then paraffins and olefins are converted, but catalyst deactivates rapidly due to coke formation
Solution Approach 1:
The patent applies porosity modification through dealumination, which creates larger and more accessible pore structures in the zeolite. This porous structure modification reduces coke deposition by improving reactant access and product diffusion, thereby extending catalyst lifetime while maintaining high conversion rates
Solution Approach 2:
The dealumination treatment changes the physical and chemical parameters of the zeolite, including pore size distribution, surface area, and acidity. These parameter changes create a catalyst that resists deactivation by optimizing the balance between activity and stability
3Productivity
If conventional catalyst is used for isomerization, then paraffins are converted to isoparaffins, but considerable amount of aromatics is formed
Solution Approach 1:
The patent creates local quality differences in the catalyst by introducing noble metal sites (Pt/Pd) dispersed on the dealuminated zeolite support. These localized active sites promote hydrogenation reactions that convert aromatic precursors to saturated compounds, preventing harmful aromatic formation while maintaining isomerization productivity
Solution Approach 2:
The noble metals act as intermediary catalysts that facilitate hydrogenation reactions. They mediate the conversion of aromatic compounds and olefins to saturated isoparaffins through hydrogen addition, thereby eliminating the harmful aromatic byproduct while achieving the desired isomerization
4Productivity
If zeolite with improved porosity and acidity is used, then conversion of aromatics and olefins to isoparaffins is enhanced, but catalyst complexity increases
Solution Approach 1:
The patent applies preliminary action by performing dealumination treatment on the zeolite before the main catalytic application. This pre-treatment modifies the zeolite structure in advance to achieve optimal porosity and acidity, simplifying the overall process by eliminating the need for complex catalyst formulations during operation
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 modified zeolite catalyst effectively increases the octane number of FCC gasoline by 10-15 units, reduces aromatics and olefins, and enhances the production of branched paraffins, achieving a 20-40% increase in research octane number and 30-70% increase in branched paraffins compared to the feedstock, while minimizing octane loss.
Implementation Method 1
A porosity and acidity modified zeolite catalyst comprising one or two noble metals is used to convert paraffins, olefins, and aromatics into isoparaffins
Implementation Method 2
A porosity and acidity modified zeolite catalyst comprising one or two noble metals, treated with steam and acid, is used to convert paraffins, olefins, and aromatics into isoparaffins, enhancing the octane number
Data Source
AI summary
The invention relates to a modified zeolite catalyst, useful for the conversion of paraffins, olefins and aromatics in a mixed feedstock such as FCC gasoline that contain high content of olefin, aromatic and n-paraffin into isoparaffins. The invention further relates to the use of such a catalyst, for example but not limited to, in a process for the conversion of paraffins, olefins and aromatics in a mixed feedstock into the product having high amount of branched paraffins with decreased aromatics and olefins, a useful gasoline blend, with negligible production of lighter gases.