Iron-Modified Dehydrogenation Catalyst for Methane Combustion Heating
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Solution Overview
Problem
Conventional catalysts used for light olefin production suffer from low methane combustion activity, leading to insufficient heating of the catalyst and safety concerns due to un-combusted methane exceeding flammability limits.
Innovation Solution
A catalyst composition comprising 0.1 wt.% to 10 wt.% of gallium, indium, or thallium, 5 ppmw to 1000 ppmw of platinum, palladium, rhodium, iridium, ruthenium, or osmium, 100 ppmw to 30000 ppmw of iron, and at least 85 wt.% support, which enhances methane combustion and provides dual catalytic functionality for dehydrogenation and combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts are used for dehydrogenation, then dehydrogenation activity is maintained, but methane combustion activity is insufficient leading to safety hazards
Solution Approach 1:
The catalyst composition is modified by adding iron (100-30000 ppmw) to the conventional gallium-platinum catalyst system. This parameter change in catalyst composition specifically enhances methane combustion activity while preserving dehydrogenation functionality, converting un-combusted methane intocombustion heat and eliminating the safety hazard of methane accumulation
Solution Approach 2:
The catalyst is designed to perform multiple functions simultaneously: it maintains dehydrogenation activity for light olefin production while gaining enhanced methane combustion capability. The iron component enables the catalyst to combust methane that would otherwise escape unburned, making the catalyst universally effective for both production and safety functions
2Productivity
If supplemental fuel combustion is used to heat the catalyst, then dehydrogenation efficiency is improved, but insufficient combustion activity leads to inadequate heating
Solution Approach 1:
The catalyst's combustion activity is enhanced through the addition of iron, which increases the combustion rate and heat generation from supplemental fuel. This ensures the catalyst reaches and maintains the optimal temperature range (600-750°C) required for efficient dehydrogenation reactions
Solution Approach 2:
The enhanced combustion activity allows for more rapid heating of the catalyst, enabling the system to quickly reach the required operating temperature and maintain it during the dehydrogenation process, preventing temperature fluctuations that would reduce productivity
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 catalyst composition effectively utilizes methane as a supplemental fuel to heat the catalyst, improving dehydrogenation efficiency and safety by maintaining optimal temperature levels.
Implementation Method 1
the catalyst may be heated by combusting a supplemental fuel. The supplemental fuel may comprise methane
Implementation Method 2
light olefins may be formed by the catalytic dehydrogenation of alkanes in a fluidized bed reactor
Data Source
AI summary
A method may include contacting a hydrocarbon-containing feed with a catalyst in a reactor to form an olefin-containing effluent, then at least partially separating the olefin-containing effluent from the catalyst. Passing the catalyst to a combustor and heating the catalyst by combusting a supplemental fuel. The supplemental fuel includes methane in an amount greater than or equal to 1 mol. %. Passing the catalyst from the combustor to the reactor, such that at least a portion of the catalyst continuously cycles between the reactor and the combustor. The catalyst includes from 0.1 wt. % to 10 wt. % of one or more metals chosen from gallium, indium, thallium or combinations thereof, from 5 ppmw to 1000 ppmw of one or more metals chosen from platinum, palladium, rhodium, iridium, ruthenium, osmium, or combinations thereof, from 100 ppmw to 30000 ppmw of iron, and at least 85 wt. % support.