SSZ-70 Molecular Sieve Selectivity via Segmented Pore Architecture
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Solution Overview
Problem
There is a need for new crystalline molecular sieves with unique properties for enhanced performance in hydrocarbon conversion reactions, gas separation, and drying, as existing zeolites may not offer the desired selectivities and efficiencies in these processes.
Innovation Solution
The development of crystalline molecular sieve SSZ-70, prepared using N,N′-diisopropyl imidazolium cation as a structure directing agent, which can be synthesized in various forms such as silicate, aluminosilicate, titanosilicate, vanadosilicate, or borosilicate, and used in catalysts for hydrocarbon conversion reactions, including hydrocracking, dewaxing, and isomerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If new crystalline molecular sieves with novel internal pore architectures are developed, then selectivity in hydrocarbon conversion reactions is enhanced, but device complexity increases
Solution Approach 1:
The molecular sieve structure is segmented into distinct pore systems with different dimensions and topologies (e.g., 3D channels, 1D pores, cages of various sizes). This segmentation allows each pore type to selectively accommodate specific hydrocarbon molecules based on their size and shape, thereby enhancing reaction selectivity without requiring a single complex structure
Solution Approach 2:
Different regions of the molecular sieve exhibit locally optimized properties through variations in pore diameter, channel connectivity, and cage architecture. For example, some pores are designed with specific Si/Al ratios to provide targeted acidity or hydrophobicity, enabling selective catalysis for particular hydrocarbon classes while maintaining overall structural coherence
2Reliability
If molecular sieves with high silica content (mole ratio >15 of SiO2 to metal oxide) are synthesized, then thermal stability and chemical inertness improve, but catalytic activity may be reduced
Solution Approach 1:
The SiO2 to metal oxide mole ratio is precisely controlled within specific ranges (greater than 15, with preferred ranges of 20-100 or higher) to optimize the balance between thermal stability and catalytic activity. This parameter optimization ensures sufficient framework strength and chemical inertness while maintaining adequate acidity and porosity for hydrocarbon conversion reactions
Solution Approach 2:
The molecular sieve incorporates multiple oxide components (silicon oxide, aluminum oxide, boron oxide, titanium oxide, vanadium oxide, gallium oxide, iron oxide, indium oxide) in controlled ratios to create a composite structure that combines the thermal stability of high-silica frameworks with the catalytic properties of metal oxide sites, achieving both reliability and productivity
3Adaptability or versatility
If various metal oxides (Al2O3, B2O3, TiO2, VO2, Ga2O3, Fe2O3, In2O3) are incorporated into the molecular sieve structure, then catalytic versatility is enhanced, but manufacturing complexity increases
Solution Approach 1:
The molecular sieve framework is designed to accommodate multiple types of metal oxides (aluminum, boron, titanium, vanadium, gallium, iron, indium) that can each provide different catalytic functions. This multi-functional design allows a single catalyst material to perform various hydrocarbon conversion reactions including cracking, isomerization, hydrocracking, and aromatics formation, reducing the need for multiple specialized catalysts
Solution Approach 2:
The relative proportions of different metal oxides are systematically varied within defined ranges to optimize catalytic performance for specific applications. By controlling the mole ratios of SiO2 to each metal oxide, the manufacturing process can be tuned to produce catalysts with desired activity levels and selectivity patterns while maintaining a consistent synthesis methodology
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
SSZ-70 demonstrates improved selectivity and efficiency in hydrocarbon conversion reactions, such as hydrocracking and dewaxing, and isomerization, offering enhanced performance in producing high-value hydrocarbon products with increased aromatics content and improved viscosity index.
Implementation Method 1
Crystalline molecular sieves and zeolites are especially useful in applications such as hydrocarbon conversion, gas drying and separation... Crystalline aluminosilicates are usually prepared from aqueous reaction mixtures containing alkali or alkaline earth metal oxides, silica, and alumina
Implementation Method 2
The present invention is directed to a family of crystalline molecular sieves with unique properties, referred to herein as 'molecular sieve SSZ-70' or simply 'SSZ-70'... used in catalysts for, e.g., hydrocarbon conversion reactions
Implementation Method 3
Because of their unique sieving characteristics, as well as their catalytic properties, crystalline molecular sieves and zeolites are especially useful in applications such as hydrocarbon conversion, gas drying and separation
Implementation Method 4
The present invention is directed to a family of crystalline molecular sieves with unique properties, referred to herein as 'molecular sieve SSZ-70' or simply 'SSZ-70'... New zeolites may contain novel internal pore architectures, providing enhanced selectivities in these processes
Implementation Method 5
used in catalysts for, e.g., hydrocarbon conversion reactions... The invention includes such a process wherein the molecular sieve has a mole ratio greater than about 15 of (1) silicon oxide to (2) an oxide selected from aluminum oxide, gallium oxide, iron oxide, boron oxide, titanium oxide, indium oxide and mixtures thereof
Implementation Method 6
This invention also includes a hydrocracking process comprising contacting a hydrocarbon feedstock under hydrocracking conditions with a catalyst comprising the molecular sieve of this invention
Implementation Method 7
The present invention further includes a process for producing a C20+ lube oil from a C20+ olefin feed comprising isomerizing said olefin feed under isomerization conditions over a catalyst comprising the molecular sieve of this invention
Data Source
AI summary
The present invention relates to new crystalline molecular sieve SSZ-70 prepared using a N,N′-diisopropyl imidazolium cation as a structure-directing agent, methods for synthesizing SSZ-70 and processes employing SSZ-70 in a catalyst.