Halloysite-Based Zeolite Catalyst for Polyaromatic Cracking
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Solution Overview
Problem
Conventional zeolite catalysts used in olefin production have limitations in heavy oil conversion and stability, particularly in poor polyaromatic cracking conversion, necessitating the development of new zeolite and zeolite-based catalysts with improved attributes.
Innovation Solution
A method involving calcining clay mineral compositions with greater than or equal to 10 weight percent halloysite to form metakaolin, followed by forming a zeolite composition by combining metakaolin with a shape selective zeolite, silica particles, a basic compound, and a templating agent, and then hydrothermally treating and calcining to produce a zeolite product, which is further combined with metal precursors to enhance catalyst efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalysts are used, then the production process is simple, but the polyaromatic cracking conversion is poor
Solution Approach 1:
The patent employs composite zeolite materials combining multiple zeolite types (ZSM-5, beta zeolite, Y zeolite) with specific ratios, along with metal components (Ni, Mo, Zn, Zr) and support materials (alumina, silica). This composite structure enables simultaneous enhancement of polyaromatic cracking conversion and overall catalyst performance, resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The catalyst design incorporates different zeolite components with specific functions assigned to each: ZSM-5 for light olefin production, beta zeolite for polyaromatic cracking, and Y zeolite for heavy oil conversion. This localized functional distribution optimizes specific reaction pathways while maintaining overall catalyst efficiency, addressing the polyaromatic cracking conversion issue without requiring complete catalyst redesign.
2Productivity
If zeolite compositions with improved efficiency are produced using halloysite-based methods, then hydrocarbon cracking efficiency increases, but the manufacturing process becomes more complex
Solution Approach 1:
The patent performs preliminary calcination of halloysite clay mineral to form metakaolin before zeolite synthesis. This pre-treatment step modifies the clay structure to enhance subsequent zeolite crystal growth and improve the final catalyst's surface area and pore structure, thereby increasing hydrocarbon cracking efficiency while managing process complexity through systematic preparation.
Solution Approach 2:
The manufacturing process utilizes controlled variation of synthesis parameters including hydrothermal treatment temperature (100-200°C), treatment time (12-72 hours), and component ratios (silica-to-alumina ratio, template concentration) to optimize zeolite crystal formation. These parameter adjustments enable precise control over zeolite structure and catalyst performance, improving cracking efficiency through scientifically managed process complexity.
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 approach results in zeolite and catalyst compositions with improved efficiency in hydrocarbon cracking, specifically demonstrating increased surface area and pore volume, leading to enhanced production of valuable olefins like ethylene and propylene.
Implementation Method 1
calcining one or more clay mineral compositions to form metakaolin
Implementation Method 2
hydrothermally treating the slurry to form a hydrothermal product
Implementation Method 3
calcining the hydrothermal product to form a zeolite product
Data Source
AI summary
This disclosure relates to methods of forming a zeolite composition, the method comprising calcining one or more clay mineral compositions to form metakaolin, wherein the one or more clay mineral compositions may comprise greater than or equal to 10 wt. % halloysite, forming a slurry by combining at least the metakaolin, a shape selective zeolite, a basic compound, silica particles, and a templating agent, hydrothermally treating the slurry to form a hydrothermal product, calcining the hydrothermal product to form a zeolite product, combining the zeolite product and at least one metal precursor, wherein the at least one metal precursor may comprise a manganese precursor, a phosphorous precursor, or both a manganese precursor and a phosphorous precursor to form a zeolite composition comprising manganese, phosphorus, or both manganese and phosphorous.