Zeolite Y Copper Adsorbent for Low-Temperature Fuel Desulfurization
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Solution Overview
Problem
Conventional desulfurization systems for hydrogen generation in fuel cell processing trains are inadequate in removing a wide range of sulfur compounds, especially at low temperatures and extended periods, and can produce synthesized sulfur compounds, leading to reduced system lifespan and efficiency.
Innovation Solution
A desulfurization system using a zeolite Y sulfur adsorbent exchanged with copper cations and one or more selective sulfur adsorbents like copper oxide and manganese compounds, operating at temperatures below 100°C, effectively removes sulfur compounds from hydrocarbon fuel streams, including those with water, by optimizing the composition and sequence of adsorbents based on the specific sulfur compounds present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional desulfurization systems are used, then sulfur compounds can be removed from hydrocarbon fuel streams, but they fail to remove a wide range of sulfur compounds effectively at low temperatures and extended periods
Solution Approach 1:
The patent employs a composite adsorbent system combining zeolite Y exchanged with copper cations and selective sulfur adsorbents (copper oxide and manganese compounds). This composite approach leverages the complementary properties of each material: zeolite Y provides structured porosity and cation exchange capacity, while copper oxide and manganese compounds offer selective sulfur compound adsorption. The combination enables effective removal of diverse sulfur compounds at low temperatures where single-material systems fail.
Solution Approach 2:
The patent optimizes the local composition and sequence of adsorbents based on the specific sulfur compounds present in the fuel stream. Different regions of the adsorbent bed are tailored to target specific sulfur compounds, with the choice of sulfur adsorbent through which the fuel stream first passes depending on the type of sulfur material present. This localized optimization enables effective desulfurization across a wide range of sulfur compounds at low temperatures.
2Reliability
If conventional desulfurization systems operate at low temperatures, then energy consumption is reduced, but sulfur compound removal efficiency decreases
Solution Approach 1:
The patent changes the chemical and physical parameters of the adsorbent materials by exchanging zeolite Y with copper cations and incorporating copper oxide and manganese compounds. These parameter changes enable the adsorbent system to maintain high sulfur compound removal efficiency at low temperatures, eliminating the need for energy-intensive high-temperature operation while achieving superior desulfurization performance.
3Duration of action of moving object
If conventional desulfurization systems are used for extended periods, then continuous fuel supply is maintained, but synthesized sulfur compounds are produced reducing system lifespan
Solution Approach 1:
The patent converts the potential harm of synthesized sulfur compounds into a benefit by using copper oxide and manganese compounds that actively prevent synthesis reactions. These selective adsorbents not only remove existing sulfur compounds but also inhibit the formation of synthesized sulfur compounds during extended operation, thereby extending system lifespan while maintaining continuous fuel supply.
Solution Approach 2:
The copper oxide and manganese compounds act as intermediary substances between the hydrocarbon fuel stream and the zeolite Y adsorbent. They selectively interact with sulfur compounds and their precursors, preventing the synthesis of harmful sulfur compounds while facilitating the removal of sulfur compounds through the adsorbent system, thus protecting the system during extended operation.
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
This approach achieves sulfur adsorption levels below conventional detection limits for an extended period, delaying breakthrough and reducing the production of synthesized sulfur compounds, thus enhancing the lifespan and efficiency of fuel cell processing trains.
Implementation Method 1
passing a nondesulfurized hydrocarbon fuel stream, particularly natural gas, propane or liquefied petroleum gas (LPG), through a sulfur adsorbent system at temperatures less than 100°C, wherein the sulfur adsorbent system contains a zeolite Y sulfur adsorbent, preferably exchanged with copper ions
Implementation Method 2
at least one selective sulfur adsorbent comprising copper oxide and one or more manganese compounds, and passing the nondesulfurized hydrocarbon fuel stream through or over the desulfurization system
Data Source
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AI summary
A method for producing a substantially desulfurized hydrocarbon fuel stream at temperatures less than 100°C. The method includes providing a nondesulfurized fuel cell hydrocarbon fuel stream that may include water and passing the fuel stream through a zeolite Y adsorbent and a selective sulfur adsorbent. The zeolite Y adsorbent may be exchanged with copper ions. The sequence of use depends on the particular sulfur compounds present in the fuel stream. The method produces a substantially desulfurized hydrocarbon fuel stream containing less than 50 ppb sulfur.