Multi-Component Catalyst for Thermo-Neutral Hydrocarbon Reforming
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Solution Overview
Problem
Current hydrogen production methods, such as hydrocarbon steam reforming, partial oxidation, and autothermal reforming, face limitations in efficiency, selectivity, and catalyst deactivation due to carbon deposition and sulfur poisoning, especially when processing heavier hydrocarbon fuels with higher sulfur and metal content, and require significant heat input which is often achieved through combustion, leading to inefficiencies and infrastructure challenges.
Innovation Solution
A thermo-neutral reforming process utilizing a multi-component catalyst comprising rare earth metal oxides, nickel, platinum group metals, and rhenium, which enables hydrogen spillover effects to prevent carbon deposition and sulfur poisoning, allowing for simultaneous catalytic combustion and steam reforming on the same catalyst surface, thereby achieving ultra-rapid and efficient hydrogen production with minimal heat loss and catalyst deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrocarbon steam reforming is used to produce hydrogen, then hydrogen production is achieved, but significant heat input is required and catalyst deactivation occurs due to carbon deposition
Solution Approach 1:
The patent converts the harmful effect of carbon deposition into a beneficial process by introducing controlled oxygen to oxidize the carbon deposits in-situ. The multi-component catalyst facilitates this conversion, transforming the harmful carbon that causes deactivation into useful carbon monoxide and carbon dioxide, thereby maintaining catalyst activity while continuing hydrogen production
Solution Approach 2:
The patent employs a multi-component catalyst system combining nickel, rare earth metals, and other components that work synergistically. This composite catalyst structure enables simultaneous steam reforming activity and resistance to carbon deposition, resolving the contradiction between maintaining high hydrogen production and preventing catalyst deactivation
2Quantity of substance
If hydrocarbon steam reforming is used to produce hydrogen, then hydrogen production is achieved, but significant heat input is required leading to energy inefficiency
Solution Approach 1:
The patent merges the steam reforming process with a partial oxidation process by introducing controlled oxygen into the reformer. The exothermic oxidation reaction occurs simultaneously with the endothermic steam reforming, providing in-situ heat that reduces or eliminates the need for external heat input while maintaining hydrogen production
Solution Approach 2:
The reforming system becomes self-sufficient by generating its own heat requirement through controlled partial oxidation of the feedstock. The process serves itself by using a portion of the input hydrocarbon and oxygen to generate the thermal energy needed for the steam reforming reaction, eliminating dependence on external heating systems
3Adaptability or versatility
If heavier hydrocarbon fuels with higher sulfur and metal content are processed, then fuel versatility is improved, but catalyst deactivation due to sulfur poisoning increases
Solution Approach 1:
The patent converts the harmful sulfur compounds present in heavier fuels into beneficial effects by oxidizing them to sulfur dioxide and sulfur trioxide, which then dissolve in the water-gas-shift equilibrium to form sulfuric acid species that actually promote the reforming reaction and prevent sulfur deposition on the catalyst, thereby maintaining catalyst activity while processing high-sulfur fuels
4Productivity
If partial oxidation is used instead of steam reforming, then reaction rates are higher, but hydrogen yield per carbon in the fuel is lower
Solution Approach 1:
The patent combines partial oxidation and steam reforming into a single integrated process. The controlled partial oxidation provides the high reaction rates and in-situ heat generation, while the steam reforming component ensures high hydrogen yield per carbon. The multi-component catalyst enables both reactions to occur simultaneously and synergistically, achieving both high productivity and high hydrogen yield
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 process achieves over 97% conversion of liquid hydrocarbon fuels to hydrogen-rich syngas with high gaseous hourly space velocity, maintaining catalyst activity and reducing reactor size by two orders of magnitude compared to traditional steam reformers, while avoiding coke formation and sulfur poisoning, and can operate over a wide range of conditions.
Implementation Method 1
enables hydrogen spillover effects to prevent carbon deposition and sulfur poisoning
Implementation Method 2
simultaneous catalytic combustion and steam reforming on the same catalyst surface
Implementation Method 3
steam reforming, partial oxidation, and autothermal reforming
Data Source
AI summary
A method is provided for the thermo-neutral reforming of liquid hydrocarbon fuels which employs a Ni, Ce2O3, La2O3, Pt−ZrO2, Rh and Re catalyst having dual functionalities to achieve both combustion and steam reforming.