Catalyst Regeneration via Chlorine Gas Treatment
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Solution Overview
Problem
Catalysts, such as aromatization catalysts, face deactivation due to mechanisms like coke formation, metal sintering, and metal migration, which negatively impact metal dispersion.
Innovation Solution
A method involving the regeneration of spent catalysts by contacting them with a stream of chlorine gas to produce a chlorinated catalyst, followed by exposure to oxygen gas to form a regenerated catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a catalyst is used for aromatization reactions, then chemical conversion productivity is improved, but metal sintering occurs leading to decreased metal dispersion
Solution Approach 1:
The patent applies preliminary action by performing chlorination treatment on the spent catalyst before regeneration. The chlorine modifies the metal oxide surface in advance, creating a more uniform distribution of metal sites that will be formed after reduction. This preliminary chemical modification prevents sintering during subsequent use and maintains high metal dispersion, thereby resolving the contradiction between productivity and metal dispersion.
2Reliability
If a catalyst is regenerated by conventional methods, then catalyst activity is restored, but metal dispersion deteriorates due to sintering
Solution Approach 1:
The patent changes the chemical parameters of the regeneration process by introducing chlorine gas treatment at controlled temperatures (200-500°C). This parameter change modifies the surface chemistry of the metal oxide, preventing sintering during reduction and maintaining uniform metal dispersion. The chlorination step creates a protective effect that preserves metal dispersion while restoring catalyst activity, resolving the contradiction between reliability and manufacturing precision.
3Manufacturing precision
If chlorine gas is used to treat spent catalyst, then metal dispersion is improved, but process complexity increases
Solution Approach 1:
The patent merges the chlorination step with the existing regeneration process flow. The chlorine treatment is integrated into the catalyst regeneration cycle, combining multiple functions (metal dispersion improvement and activity restoration) into a unified process. This integration minimizes additional equipment requirements and operational complexity while achieving the desired improvement in metal dispersion.
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 regeneration process significantly improves the metal dispersion of the catalyst, restoring its activity and selectivity to levels comparable to fresh catalysts.
Implementation Method 1
contacting the spent catalyst and a first stream that includes chlorine gas (Cl2) to produce a chlorinated catalyst
Implementation Method 2
contacting the chlorinated catalyst and a second stream that includes oxygen gas (O2) to form a regenerated catalyst
Data Source
AI summary
Methods of improving metal dispersion of a catalyst, such as by contacting a spent catalyst and a stream including chlorine gas, and a stream including oxygen gas to form a regenerated catalyst. The regenerated catalyst may be used to catalyze a chemical reaction, and, after the chemical reaction, be regenerated one or more additional times.