Nitrogen-Containing Carbon Catalyst Regeneration for Structure Preservation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for regenerating nitrogen-doped porous carbon catalysts used in the cracking of 1,2-dichloroethane (EDC) to produce vinyl chloride (VCM) are ineffective, as they destroy the catalyst's structure and reduce its mechanical strength and activity due to carbon deposits, making them unsuitable for industrial application.
Innovation Solution
A regeneration method involving roasting the nitrogen-containing carbon catalyst in a nitrogen-containing atmosphere to remove carbon deposits, followed by cooling and optionally switching to an inert atmosphere, which maintains the catalyst's structure and enhances its performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If oxidation regeneration method is used to remove carbon deposits from nitrogen-doped porous carbon catalyst, then carbon deposits are removed, but the original skeleton structure of the porous carbon material is destroyed, causing reduction in mechanical strength and activity
Solution Approach 1:
The patent applies inert atmosphere (nitrogen or carbon dioxide) during the regeneration process to prevent oxidation of the porous carbon skeleton. By maintaining an inert environment, the carbon deposits can be removed through controlled combustion or other methods without exposing the catalyst support to oxidative conditions that would destroy its structure, thus preserving mechanical strength while achieving regeneration.
Solution Approach 2:
The patent changes the regeneration parameters by controlling temperature, atmosphere composition, and treatment time to selectively remove carbon deposits while preserving the porous carbon structure. By optimizing these parameters, the regeneration process achieves effective carbon removal without exceeding the threshold that would cause structural degradation.
2Loss of substance
If oxidation regeneration method is used to remove carbon deposits from nitrogen-doped porous carbon catalyst, then carbon deposits are removed, but the activity of the catalyst is reduced
Solution Approach 1:
The patent uses inert atmosphere during regeneration to protect the nitrogen-doped active sites and porous structure from oxidation damage. This ensures that while carbon deposits are removed, the catalytically active components and the porous architecture remain intact, preserving catalyst activity for subsequent reactions.
Solution Approach 2:
The patent optimizes regeneration parameters including temperature profile, atmosphere composition, and treatment duration to achieve selective carbon removal. By carefully controlling these parameters, the process removes deactivating carbon deposits while maintaining the structural and chemical properties necessary for catalyst activity.
3Productivity
If pyrolysis technology without catalyst is used for EDC cracking, then high conversion rate is achieved, but high reaction temperature and high energy consumption are required
Solution Approach 1:
The patent introduces nitrogen-doped porous carbon as a catalyst that acts as an intermediary to facilitate the EDC cracking reaction. This catalyst provides alternative reaction pathways with lower activation energy, enabling the reaction to proceed at lower temperatures while maintaining high conversion rates, thus resolving the contradiction between productivity and temperature requirements.
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 regenerated catalyst achieves performance equivalent to or better than fresh catalysts, with stable selectivity and conversion rates, and can be reused in-situ, reducing preparation costs and environmental impact.
Implementation Method 1
roasting the nitrogen-containing carbon catalyst in a nitrogen-containing atmosphere to obtain a regenerated nitrogen-containing carbon catalyst
Data Source
AI summary
A regeneration method of a nitrogen-containing carbon catalyst includes the following steps: roasting the nitrogen-containing carbon catalyst in a nitrogen-containing atmosphere to obtain a regenerated nitrogen-containing carbon catalyst. The method is a universal method, which is suitable for nitrogen-doped carbon catalysts and can be used to regenerate a nitrogen-containing carbon catalyst for producing vinyl chloride (VC) through 1,2-dichloroethane cracking. The method can greatly reduce the production cost of the catalyst and increase the service life of the catalyst, and a regeneration process thereof is fast, simple, and controllable, and does not require high temperatures.