Catalytic Phase Transition Sorbents for Isothermal Hydrogen Production
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Solution Overview
Problem
Current methods for producing hydrogen-enriched syngas from carbonaceous feedstocks face challenges in achieving high hydrogen levels with low or no CO2, using catalysts capable of regeneration for multiple cycles, and operating isothermally or near-isothermally, which complicates syngas conditioning and downstream separation processes.
Innovation Solution
The development of catalytic phase transition sorbents (PTS) with formulas ABO3 and An+1BnO3n+1, comprising alkali or alkaline earth metals and transition metals, used in a system with two interconnected reactors under different oxygen partial pressures, where the sorbents are regenerated and reused, enabling efficient hydrogen generation with minimal CO2 production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gasification and reforming approaches are used to convert carbonaceous fuels to syngas, then high conversion rates are achieved, but the formation of undesired CO2 via water-gas-shift reaction lowers the H2 concentration and requires energy-intensive separation steps
Solution Approach 1:
The patent extracts and removes CO2 from the syngas stream using a sorbent material that selectively captures CO2 while allowing H2 to pass through. This extraction approach separates the harmful CO2 component from the desired H2, achieving high H2 concentration without requiring energy-intensive conventional separation steps.
Solution Approach 2:
The patent changes the chemical parameters of the gasification process by using a sorbent that shifts the water-gas-shift reaction equilibrium. The sorbent captures CO2, changing the partial pressure parameters and driving the reaction toward higher H2 production, thereby improving H2 concentration while maintaining high conversion rates.
2Manufacturing precision
If syngas conditioning and downstream separation steps are added to improve product gas quality, then H2 concentration is increased, but energy consumption and process complexity increase significantly
Solution Approach 1:
The patent merges the gasification reaction and CO2 separation into a single integrated process step. The sorbent is introduced directly into the gasifier, combining the conversion and purification functions in one reactor, thereby eliminating the need for separate conditioning and separation units that would consume additional energy.
Solution Approach 2:
The sorbent material performs self-regeneration through temperature swing or pressure swing within the same reactor system. The sorbent automatically cycles between CO2 capture and release modes without requiring external energy-intensive regeneration units, enabling the system to maintain high H2 concentration with minimal additional energy input.
3Duration of action of stationary object
If a catalyst capable of regeneration for numerous cycles is implemented, then process sustainability is improved, but device complexity and operational requirements increase
Solution Approach 1:
The patent implements periodic cycling of the sorbent between reduction and oxidation states. The sorbent alternates between capturing CO2 during the gasification phase and being regenerated during a separate phase, enabling numerous reuse cycles. This periodic action maintains catalyst activity while using a relatively simple two-reactor configuration.
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 system operates isothermally for 10 or more cycles with high hydrogen yield (50% or more relative to carbon-containing species) and minimal CO2 production, simplifying the process by eliminating the need for extensive syngas conditioning and CO2 separation steps.
Implementation Method 1
catalytic phase transition sorbents (PTS) for producing hydrogen-enriched syngas from a carbonaceous feedstock
Implementation Method 2
catalytic phase transition sorbents (PTS) for producing hydrogen-enriched syngas from a carbonaceous feedstock
Implementation Method 3
Conventional gasification and reforming approaches can convert a variety of carbonaceous fuels to syngas with high conversions
Implementation Method 4
regenerating the spent PTS with an oxygen-containing gas to create fresh PTS
Implementation Method 5
the formation of undesired CO2 via the co-occurring water-gas-shift reaction lowers the H2 concentration of the syngas stream
Data Source
AI summary
In one aspect, the disclosure relates to catalytic phase transfer sorbents (PTS) for producing hydrogen-enriched syngas from a carbonaceous feedstock, the PTS comprising a formula selected from ABO3 and An+1BnO3n+1, wherein A comprises one or more alkali metals or alkaline earth metals, wherein B comprises one or more transition metals, and wherein X comprises an anion. Also disclosed is a system for hydrogen generation from carbonaceous feedstocks, the system comprising a gasifier unit for production of H2-rich syngas and a regenerator unit for regeneration of spent PTS. Further disclosed herein is a method for hydrogen generation from carbonaceous feedstocks using the disclosed systems. The disclosed systems can be operated isothermally through 10 or more cycles without degradation in performance, while the disclosed methods can yield 50% or more H2 relative to carbon-containing species. In some aspects, the methods produce little to no CO2.