Surface-Modified Oxygen Carriers for Low-Temperature Olefin Catalysis
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Solution Overview
Problem
Current methods for converting natural gas liquids and naphtha to olefins, such as steam cracking, are energy-intensive and produce significant emissions, and are not economically viable for small-scale operations due to high energy requirements and environmental impacts.
Innovation Solution
Development of redox catalysts with a core oxygen carrier and a surface-modifying shell, comprising specific metal salts and tungstates, which facilitate low-temperature oxidative dehydrogenation and cracking processes, reducing energy consumption and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam cracking is used to convert natural gas liquids and naphtha to olefins, then olefin production is achieved, but energy consumption is excessive and emissions are significant
Solution Approach 1:
The patent changes the operating temperature parameter from high temperature (steam cracking) to low temperature (oxidative dehydrogenation), fundamentally altering the energy requirements of the process. The core-shell catalyst enables this parameter change by providing active sites for oxidation at lower temperatures while maintaining catalytic activity for olefin production.
Solution Approach 2:
The patent employs a composite core-shell catalyst structure where the core material (e.g., metal oxide) provides oxygen storage and release capabilities, while the shell material (e.g., zeolite or other catalyst) provides selective cracking activity. This composite structure enables low-temperature oxidative dehydrogenation to produce olefins with high efficiency and reduced energy consumption.
2Productivity
If steam cracking is used to convert natural gas liquids and naphtha to olefins, then olefin production is achieved, but CO2 and NOx emissions increase
Solution Approach 1:
The patent changes the temperature parameter to operate below the threshold for significant NOx formation, while using controlled oxidation to achieve olefin production. This parameter change fundamentally reduces the formation of harmful emissions while maintaining productivity.
Solution Approach 2:
The patent converts the harmful combustion process into a beneficial controlled oxidation process. By using the core-shell catalyst to facilitate selective oxidative dehydrogenation, the energy release from oxidation is harnessed to drive the endothermic cracking reaction, reducing the need for external fuel combustion and associated emissions.
3Productivity
If high temperature is used for steam cracking, then olefin production is maintained, but the process is not economically viable for small-scale operations
Solution Approach 1:
The patent changes the temperature parameter from high to low, which reduces capital equipment requirements, energy infrastructure needs, and operational complexity. This makes the process economically viable for small-scale and distributed operations while maintaining olefin production capability.
Solution Approach 2:
The patent enables distributed small-scale production units to be deployed locally near natural gas liquid sources, segmenting the olefin production process from centralized large-scale steam cracking facilities. This segmentation reduces transportation costs and enables economic viability for small-scale operations.
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 redox catalysts enable efficient conversion of saturated hydrocarbons to unsaturated hydrocarbons at lower temperatures, improving energy efficiency and reducing environmental impact while maintaining high selectivity and stability.
Implementation Method 1
redox catalysts enable efficient conversion of saturated hydrocarbons to unsaturated hydrocarbons
Implementation Method 2
the outer shell comprising a metal salt. The salt can modify the surface of the catalysts
Data Source
AI summary
Redox catalysts having surface medication, methods of making redox catalysts with surface modification, and uses of the surface modified redox catalysts are provided. In some aspects, the redox catalysts include a core oxygen carrier region such as CaMnO3, BaMnO3-δ, SrMnO3-δ, Mn2SiO4, Mn2MgO4-δ, La0.8Sr0.2O3-δ, La0.8Sr0.2FeO3-δ, Ca9Ti0.1Mn0.9O3-δ, Pr6O11-δ, manganese ore, or a combination thereof; and an outer shell having an average thickness of about 1-100 monolayers surrounding the outer surface of the core region. The outer shell can include, for example a salt selected such as Li2WO4, Na2WO4, K2WO4, SrWO4, Li2MoO4, Na2MoO4, K2MoO4, CsMoO4, Li2CO3, Na2CO3, K2CO3, or a combination thereof.