Nano-sized BEA Zeolite Catalyst for Hydrocarbon Conversion
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Solution Overview
Problem
Current methods fail to consistently produce characterizable nano-sized Beta (BEA) zeolites with incorporated metal oxides, leading to diffusion limitations and instability in hydrocarbon conversion processes, especially in the presence of steam, which reduces catalytic reactivity and selectivity.
Innovation Solution
A five-step process involving calcination, desilication, metal oxide incorporation, protonation, and calcination is employed to convert nano-sized BEA zeolites into hydrophobic-like catalysts with increased mesoporosity and surface area, enhancing their stability and reactivity for hydrocarbon conversions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BEA zeolite is used for hydrocarbon conversion, then catalytic activity is achieved, but coke formation and deactivation occur due to diffusion limitations in pore structures
Solution Approach 1:
The zeolite crystal structure is segmented into nano-sized particles (10-100 nm) to create shorter diffusion paths within the pore structure. This segmentation reduces the distance hydrocarbon molecules must travel, preventing 'over-staying' and subsequent coke formation while maintaining catalytic activity.
Solution Approach 2:
The patent utilizes the inherent porous BEA zeolite structure with specific pore dimensions (0.65 x 0.53 nm) to enable shape-selective catalysis. The controlled porosity allows efficient diffusion of hydrocarbon molecules while the nano-size optimization prevents diffusion limitations that lead to coke deposition.
2Productivity
If steam is used in hydrocarbon conversion, then reaction efficiency is improved, but zeolite framework degradation and acidity loss occur
Solution Approach 1:
The patent creates a composite catalyst system by incorporating metal oxides (such as Ga2O3, ZnO, or Al2O3) into the BEA zeolite framework. This composite structure enhances framework stability against steam-induced degradation while maintaining the acidic sites necessary for catalysis, preventing alumina leaching and preserving shape selectivity.
Solution Approach 2:
The patent modifies the chemical composition parameters of the zeolite framework by incorporating heteroatom metal oxides at specific concentrations (0.1-10 wt%). This parameter change increases the framework's resistance to steam hydrolysis while maintaining catalytic functionality for hydrocarbon conversion.
3Object-generated harmful factors
If nano-sized crystals are synthesized to control diffusion paths, then coke formation is reduced, but manufacturing consistency and characterization difficulty increase
Solution Approach 1:
The patent uses organic structure-directing agents (SDAs) as intermediaries during the hydrothermal synthesis process to control nucleation and crystal growth. These SDAs mediate the formation of uniform nano-sized BEA zeolite particles with consistent morphology and size distribution, enabling reproducible manufacturing while maintaining the desired nano-scale dimensions for reduced coke formation.
Solution Approach 2:
The patent implements controlled synthesis conditions with precise temperature (100-200°C), pressure, and pH monitoring to provide feedback control over crystal growth. This feedback mechanism ensures consistent nano-sized particle formation and allows for real-time adjustment to maintain manufacturing precision.
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 nano-sized BEA zeolites exhibit improved catalytic performance and stability, with increased mesopore volume and surface area, enabling effective hydrocarbon cracking and conversion, even in steam environments, and are suitable for various petrochemical applications.
Implementation Method 1
A five-step process involving calcination, desilication, metal oxide incorporation, protonation, and calcination is employed to convert nano-sized BEA zeolites into hydrophobic-like catalysts
Implementation Method 2
A five-step process involving calcination, desilication, metal oxide incorporation, protonation, and calcination is employed to convert nano-sized BEA zeolites into hydrophobic-like catalysts
Data Source
AI summary
Methods and systems for production of consistently-sized BEA zeolite nano-crystals incorporating at least one metal oxide, the method including removing an organic template from a BEA zeolite comprising an organic template via calcination; desilicating the BEA zeolite following the step of removing the organic template; incorporating at least one metal oxide into the structure of the BEA zeolite after the step of desilicating; protonating the BEA zeolite after the step of incorporating the at least one metal oxide; and calcining the BEA zeolite after the step of protonating to form a modified BEA zeolite product.