Alumina Isomerization Catalyst Pore Structure Optimization
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Solution Overview
Problem
The existing isomerization catalysts in olefin isomerization and disproportionation processes become spent, leading to reduced reactivity and efficiency, necessitating frequent catalyst replacement.
Innovation Solution
An isomerization catalyst composition based on alumina with specific pore volume, pore diameter, and surface area characteristics, along with the inclusion of Group I and Group II cations, is developed to enhance catalyst performance and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional isomerization catalysts are used, then initial reactivity is achieved, but catalyst becomes spent quickly requiring frequent replacement
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pore size distribution (median pore diameter 70-150 Å, specific pore volume ratios) and surface area (200-400 m²/g) of the alumina catalyst support, along with optimizing the loading amounts of Group I and Group II cations. These parameter optimizations enable the catalyst to maintain both high initial reactivity and extended run time by preventing rapid deactivation while preserving active sites.
Solution Approach 2:
The patent employs composite materials by combining alumina base material with multiple metal cations (Group I cations like Na⁺, K⁺, Cs⁺ and Group II cations like Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺) to create a multi-component catalyst system. This composite structure synergistically enhances both the initial activity and the durability of the catalyst, allowing it to resist deactivation mechanisms that would otherwise limit run time.
2Reliability
If catalyst replacement is performed frequently, then reactivity is maintained, but process efficiency and productivity decrease
Solution Approach 1:
The patent achieves continuity of useful action by designing a catalyst that maintains stable reactivity over extended periods. The optimized pore structure and cation composition prevent rapid deactivation, allowing the catalyst to operate continuously at high efficiency without requiring frequent interruptions for replacement. This extends the productive lifespan of each catalyst charge significantly.
3Duration of action of moving object
If alumina catalyst with optimized pore structure is used, then catalyst longevity improves, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the alumina support (median pore diameter 70-150 Å, surface area 200-400 m²/g, specific pore volume distribution) that can be achieved through established industrial alumina synthesis methods. By defining clear target parameters rather than requiring novel materials, the invention balances performance improvement with manufacturing feasibility.
Solution Approach 2:
The patent applies local quality by introducing specific metal cations at controlled concentrations onto the alumina surface. This localized modification of the catalyst surface properties enhances longevity without requiring complete restructuring of the bulk alumina material, thereby maintaining relative ease of manufacture through surface treatment rather than bulk synthesis changes.
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 alumina-based isomerization catalyst composition improves catalyst run time by 70% and overall process efficiency, reducing the frequency of catalyst replacement and maintaining high reactivity levels.
Implementation Method 1
an alumina based catalyst, wherein the alumina based catalyst has a pore volume in pores of less than 70 Å pore diameter of less than about 5% of Total Pore Volume, a pore volume in pores of greater than 350 Å pore diameter of less than 10% of Total Pore Volume, a median pore diameter by volume of less than 200 Å, a water pore volume of less than 1.2 cc/g and a surface area of greater than 130 m2/g
Implementation Method 2
For use in an isomerization reactor, an isomerization catalyst composition includes an alumina based catalyst, wherein the alumina based catalyst has a pore volume in pores of less than 70 Å pore diameter of less than about 5% of Total Pore Volume
Data Source
AI summary
An isomerization catalyst composition includes an alumina based catalyst, wherein the alumina based catalyst has a pore volume in pores of less than 70 Å pore diameter of less than about 5% of Total Pore Volume, a pore volume in pores of greater than 350 Å pore diameter of less than 10% of Total Pore Volume, a median pore diameter by volume of less than 200 Å, a water pore volume of less than 1.2 cc/g and a surface area of greater than 130 m2/g. The isomerization catalyst composition may include Group I cations, Group II cations and mixtures thereof.