Fluorinated Bound Zeolite Catalyst Preparation
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Solution Overview
Problem
Current methods for preparing aromatization catalysts lack high selectivity and conversion efficiency in converting hydrocarbons into aromatic compounds, necessitating improved catalyst preparation techniques.
Innovation Solution
A method involving the preparation of a bound zeolite support by contacting KL-zeolite powder with a binder and water to form a paste, followed by shaping, drying, fluorination, washing, and calcination, with the inclusion of fluoride in the range of 0.1 wt.% to 5 wt.% to enhance catalyst performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalyst preparation methods are used, then the process is simple, but the selectivity and conversion efficiency of hydrocarbons to aromatic compounds are insufficient
Solution Approach 1:
The zeolite powder is pre-fluorinated before being incorporated into the catalyst matrix, and the binder is pre-mixed with water to form a paste. These preliminary actions ensure that the fluorine is already present on the zeolite surface when the catalyst is formed, eliminating the need for post-synthesis fluorination and improving conversion efficiency from the outset
Solution Approach 2:
The catalyst is formulated as a composite material containing zeolite powder (30-80 wt%), binder (10-50 wt%), and fluoride compound (0.1-5 wt%), where each component contributes specific properties. The zeolite provides catalytic activity, the binder provides structural integrity, and the fluoride enhances selectivity and conversion efficiency for aromatic compound production
2Productivity
If fluoride is added to enhance catalyst performance, then selectivity and conversion improve, but the number of processing steps increases
Solution Approach 1:
The fluorination step is merged with the catalyst formation process by incorporating the fluoride compound into the paste mixture along with the zeolite and binder. This allows fluorine to be introduced during the shaping process itself, rather than as a separate post-treatment step, thereby improving selectivity without significantly increasing process complexity
Solution Approach 2:
The fluoride compound is applied at controlled concentrations (0.1-5 wt%) to optimize the chemical composition of the catalyst. This parameter change in the chemical environment of the zeolite surface modifies its catalytic properties, enhancing selectivity for aromatic compounds while maintaining process feasibility
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 method results in improved selectivity and conversion rates of hydrocarbons to aromatic compounds, specifically increasing benzene and toluene production while reducing undesirable light hydrocarbons, thereby enhancing the efficiency of aromatization reactions.
Implementation Method 1
contacting the extruded base with a fluorine-containing compound to form a fluorinated extruded base
Implementation Method 2
drying the wet extruded base to form an extruded base
Implementation Method 3
contacting a KL-zeolite powder with a binder and water to form a paste
Data Source
AI summary
A method of preparing a bound zeolite support comprising: contacting a zeolite powder with a binder and water to form a paste; shaping the paste to form an wet extruded base; removing excess water from the wet extruded base to form an extruded base; contacting the extruded base with a fluorine-containing compound to form a fluorinated extruded base; calcining the extruded base to form a calcined fluorinated extruded base; washing the calcined fluorinated extruded base to form a washed calcined fluorinated extruded base; drying the washed calcined fluorinated extruded base to form a dried washed calcined fluorinated extruded base; and calcining the dried washed calcined fluorinated extruded base to form a bound zeolite support.