Thermo-neutral Hydrocarbon Reforming Catalyst
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Solution Overview
Problem
Conventional syngas/hydrogen production technologies struggle to efficiently produce hydrogen from heavy liquid hydrocarbon fuels due to catalyst deactivation by high carbon and sulfur content, limiting their application and efficiency.
Innovation Solution
A four-component catalyst system comprising Ni, Pt, Ce2O3, La2O3 supported on magnesium aluminate with an alkaline metal promoter, which performs thermo-neutral reforming reactions with vaporized liquid hydrocarbons, air, and steam, minimizing coke formation and sulfidation, thus maintaining catalyst activity and extending its life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts are used for steam reforming of heavy liquid hydrocarbons, then hydrogen production can be achieved, but the catalyst quickly deactivates due to high carbon content, aromatic content, and sulfur
Solution Approach 1:
The patent employs a composite catalyst system comprising nickel supported on magnesium aluminate spinel with alkali metal promoters (potassium, sodium, or lithium). This composite structure combines the high reforming activity of nickel with the thermal stability and resistance to deactivation provided by the magnesium aluminate spinel support, while the alkali metal promoters further enhance resistance to sulfur poisoning and coke formation. The composite nature of the catalyst allows it to maintain both high productivity and reliability when processing heavy liquid hydrocarbons.
Solution Approach 2:
The patent modifies the catalyst's chemical and physical parameters by incorporating alkali metal promoters in specific quantities (0.1-5 wt% K2O, 0.1-3 wt% Na2O, or 0.1-2 wt% Li2O). These parameter changes alter the catalyst's surface properties, electron density, and resistance to poisoning, enabling it to maintain high activity and stability under the harsh conditions of heavy hydrocarbon reforming where conventional catalysts would quickly deactivate.
2Productivity
If steam reforming is used to produce hydrogen from liquid hydrocarbons, then hydrogen and CO are produced, but the endothermic nature of the reaction requires external heat supply which limits rapid response to power demand changes
Solution Approach 1:
The patent combines the endothermic steam reforming reaction with the exothermic combustion reaction within the same catalyst bed. The combustion of a portion of the hydrocarbon feed provides the necessary heat for the steam reforming reaction in-situ, eliminating the need for external heat exchangers. This merging of reactions allows the system to rapidly respond to changes in power demand by adjusting the combustion-reforming balance, thereby achieving both high hydrogen production and excellent load following capability.
Solution Approach 2:
The catalyst system enables the reformer to be self-sufficient by generating its own heat through the combustion reaction. The exothermic combustion provides the thermal energy required for the endothermic steam reforming without external heating, allowing the system to autonomously maintain reaction temperatures and rapidly adapt to varying power demands, thus achieving both high productivity and operational flexibility.
3Temperature
If auto thermal reforming is used to supply heat for steam reforming, then heat is generated within the catalyst bed, but the heat supply is limited by the heat capacity of reactant gases and requires a priori combustion
Solution Approach 1:
The patent optimizes the oxygen-to-hydrocarbon ratio parameter to achieve the desired balance between combustion heat generation and reforming efficiency. By carefully controlling this parameter, the system generates sufficient heat within the catalyst bed to drive the steam reforming reaction without requiring complex external heating systems or a priori combustion, thereby achieving high temperature capability with simplified process design.
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 catalyst system enables high hydrogen production with low detectable deactivation, achieving full conversion of liquid hydrocarbon fuels at high gaseous hourly space velocity, reducing reactor size requirements, and improving catalyst durability, making it suitable for on-board vehicle fuel processors and large-scale refining applications.
Implementation Method 1
steam reforming of liquid hydrocarbons to produce hydrogen-rich synthesis gas
Implementation Method 2
combustion reactions to generate the heat necessary for the reforming reactions
Implementation Method 3
cooperative action between the steam reforming and combustion functions on the catalyst
Data Source
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AI summary
The invention relates to a four-component catalyst (Ni-Ce203 -Pt- La203; K promoter)and a seven-component catalyst (Ni, La203, Ce203, Pt, Zr02, Rh and Re) and magnesium aluminate supports for use in the thermoneutral reforming of petroleum-based liquid hydrocarbon fuels.