Beta Zeolite Catalyst BTEX Production from Polyaromatics
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Solution Overview
Problem
Current methods for upgrading heavy oil fractions containing polyaromatic hydrocarbons to higher value middle distillates like BTEX (benzene, toluene, ethylbenzene, xylene) are inefficient, requiring optimization of catalysts to balance acid and metal functions for effective conversion.
Innovation Solution
A beta zeolite catalyst is developed, comprising a group VIB metal and a cocatalyst such as phosphorus, aluminum, boron, or silicon, which is calcinated and impregnated to enhance catalytic activity for selective ring-opening and hydrogenation, ensuring optimal BTEX production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional zeolite catalysts (NiMo/Al2O3/USY) are used for hydrocracking polyaromatic hydrocarbons, then BTEX can be produced, but the conversion efficiency and BTEX yield are insufficient
Solution Approach 1:
The patent employs a composite catalyst system combining beta zeolite support with group VIB metal (Mo or W) and cocatalyst (P, Al, B, Si, or As), creating a multifunctional catalyst that integrates acid catalysis (beta zeolite), hydrogenation (group VIB metal), and synergistic enhancement (cocatalyst) to achieve high polyaromatic hydrocarbon conversion and BTEX yield
Solution Approach 2:
The patent optimizes critical parameters including the SiO2/Al2O3 molar ratio of beta zeolite (20-100), group VIB metal content (0.1-5.0 mmol/g), and cocatalyst content (0.01-1.0 mmol/g), demonstrating that precise parameter control significantly enhances catalytic activity and BTEX production efficiency
2Reliability
If the acid catalyst characteristic and metal catalyst characteristic are not balanced in the bifunctional catalyst, then the catalyst cannot function effectively, but optimizing the balance requires extensive optimization of metal materials, supports, and metal load
Solution Approach 1:
The patent systematically optimizes key parameters including SiO2/Al2O3 molar ratio (20-100), group VIB metal content (0.1-5.0 mmol/g), and cocatalyst content (0.01-1.0 mmol/g) to achieve the optimal balance between acid and metal functions, reducing the complexity of catalyst design through defined parameter ranges
Solution Approach 2:
The beta zeolite acts as an intermediary support that provides structured acid sites and stabilizes the group VIB metal particles, while the cocatalyst serves as a mediator to enhance the synergistic interaction between the acid and metal functions, enabling effective bifunctional catalysis
Data Source
AI summary
A beta zeolite catalyst for the preparation of a BTEX (benzene, toluene, ethylbenzene, xylene) mixture from polyaromatic hydrocarbons and a preparation method of the same are disclosed. The beta zeolite catalyst demonstrates high conversion of polyaromatic hydrocarbons and high BTEX production yield by containing optimum contents of the group VIB metals and cocatalysts, so that it can be effectively used as a beta zeolite catalyst for the production of BTEX.