Aromatization Catalyst Preparation Using Boron and Halogen Activation
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Solution Overview
Problem
Aromatization catalysts experience a decline in activity and increased cracking reactions over time, leading to reduced selectivity and increased reactor temperatures, which negatively impacts the economics of the aromatization process.
Innovation Solution
A method involving a zeolitic support impregnated with a metal-containing compound and a boron-containing compound, followed by treatment with a chlorine-containing and fluorine-containing activating composition at temperatures between 100°C to 500°C, resulting in an aromatization catalyst with improved stability and reduced cracking tendencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional aromatization catalysts are used, then initial conversion rates are improved, but catalyst activity declines over time and cracking reactions increase
Solution Approach 1:
The patent uses a composite catalyst structure combining zeolitic support (L-zeolite or Y-zeolite) with metal components (platinum, palladium, or rhodium) and boron compounds. This composite material approach creates synergistic effects where the zeolite provides structural stability and the metal-boron combination enhances catalytic activity while reducing cracking, thereby maintaining both high conversion rates and catalyst stability over time.
Solution Approach 2:
The patent modifies catalyst composition parameters by incorporating specific amounts of boron (0.01-5 wt%), chlorine (0.1-5 wt%), and fluorine (0.1-5 wt%). These parameter changes optimize the catalyst's performance characteristics, improving both initial activity and long-term stability by controlling the balance between aromatization and cracking reactions.
2Duration of action of stationary object
If aromatization catalysts operate for extended periods, then production continuity is improved, but selectivity to desired aromatic compounds decreases due to increased cracking
Solution Approach 1:
The patent extracts and removes the problematic cracking activity from the catalyst system by incorporating boron compounds that specifically suppress cracking reactions. This selective removal of harmful cracking function while preserving desired aromatization function allows the catalyst to maintain high selectivity to aromatic compounds throughout its operational lifespan.
Solution Approach 2:
The patent applies different functional properties to different components of the catalyst system: the zeolitic support provides structural framework and acid sites for aromatization, while the metal-boron-chlorine-fluorine combination provides selective catalytic activity that favors aromatization over cracking. This local differentiation of functions enables the catalyst to maintain high selectivity over time.
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 maintains catalytic selectivity and reduces cracking reactions, enhancing the yield of aromatic compounds and extending the catalyst's operational lifespan.
Implementation Method 1
the impregnated support is heated in the presence of the activating composition to a temperature in the range of from about 100° C. to about 500° C.
Data Source
AI summary
A method of preparing an aromatization catalyst comprising contacting a zeolitic support with a metal-containing compound and a boron-containing compound to produce an impregnated support, and contacting the impregnated support with an activating composition to produce an aromatization catalyst, wherein the activating composition comprises a chlorine-containing compound and a fluorine-containing compound, and wherein the impregnated support is heated in the presence of the activating composition to a temperature in the range of from about 100° C. to about 500° C.