Methane Oxidation Catalyst Regeneration Under Lean CO Conditions
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Solution Overview
Problem
Methane oxidation catalysts, such as Pd/γ-Al2O3, suffer from gradual deactivation under reaction conditions, especially in wet feeds, and existing regeneration methods like net reducing atmospheres are not practical for most applications.
Innovation Solution
Regenerate deactivated methane oxidation catalysts by exposing them to a gas stream containing carbon monoxide (CO) under net lean conditions and temperatures between 125° C. to 450° C. for a period of time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If methane oxidation catalysts are used under reaction conditions in wet feeds, then methane oxidation activity is achieved, but catalyst deactivation occurs gradually
Solution Approach 1:
The patent changes the chemical parameters of the regeneration atmosphere by introducing carbon monoxide at controlled concentrations (e.g., 100-10,000 ppm) under net lean conditions with specific oxygen-to-carbon ratios (>1.05), allowing regeneration without requiring extreme reducing conditions that would compromise catalyst stability
2Reliability
If net reducing atmosphere is used for catalyst regeneration, then catalyst activity is restored, but the method is not practical for most lean methane oxidation applications
Solution Approach 1:
Instead of using a reducing atmosphere (traditional approach) to regenerate the catalyst, the patent inverts the approach by using a controlled oxidizing atmosphere with carbon monoxide present, which allows regeneration to occur under conditions compatible with lean methane oxidation operations
3Reliability
If catalyst is exposed to carbon monoxide under net lean conditions, then catalyst activity is restored, but CO concentration and temperature control must be maintained
Solution Approach 1:
The regeneration process utilizes carbon monoxide that can be present in the exhaust stream itself or easily introduced, allowing the system to regenerate the catalyst using materials already present in the process stream, reducing the need for external regeneration systems and complex control mechanisms
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 effectively restores the catalyst's activity, increasing methane conversion efficiency by 5-100% compared to the deactivated state.
Implementation Method 1
Pd/γ-Al2O3 catalysts are one of the most active components in catalyzing methane oxidation
Implementation Method 2
catalytic oxidation of methane is of great importance either for methane combustion as an energy source or for methane abatement
Data Source
AI summary
Disclosed are methods for regenerating an at least partially deactivated methane oxidation catalyst comprising contacting the catalyst with a gas stream comprising carbon monoxide (CO) under conditions that are net lean of stoichiometry and at a temperature of about 125° C. to about 450° C. over a period of time. Also provided are methane oxidation catalysts that have been regenerated according to the disclosed methods, as well as methods of catalyzing methane oxidation.