Porous Catalyst Body for Hydrocarbon Decomposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional steam reforming catalysts for fuel cells suffer from sulfur poisoning, coking, and mechanical weakness, leading to reduced catalytic activity and increased costs due to the use of noble metals and inadequate support materials.
Innovation Solution
A porous catalyst body composed of magnesium, aluminum, and nickel, with a composite oxide structure and high surface area, supported by a spinel phase, which is produced through hydrotalcite calcination and reduction, enhancing catalytic activity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional steam reforming catalysts are used, then catalytic activity for hydrocarbon decomposition is achieved, but the catalyst suffers from sulfur poisoning and coking leading to performance deterioration
Solution Approach 1:
The patent converts the harmful effect of sulfur into a beneficial one by using magnesium oxide as a support material that specifically adsorbs sulfur components, preventing them from poisoning the nickel catalyst. The magnesium oxide transforms the harmful sulfur interaction into a protective mechanism where sulfur is trapped on the support surface rather than deactivating the catalytic sites.
Solution Approach 2:
The patent employs a composite catalyst structure consisting of nickel particles supported on magnesium oxide, with aluminum oxide as an additional component. This composite material combines the high catalytic activity of nickel with the sulfur-resistant properties of magnesium oxide and the structural stability of aluminum oxide, creating a synergistic system that addresses multiple degradation mechanisms simultaneously.
2Productivity
If noble metal catalysts are used to improve catalytic activity, then decomposition performance increases, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive noble metal catalysts with a cheaper base metal catalyst system based on nickel. While nickel is more susceptible to deactivation, the use of magnesium oxide support extends its operational life by protecting against sulfur poisoning and coking, effectively creating a cost-efficient catalyst that maintains acceptable performance over extended periods.
Solution Approach 2:
The patent optimizes the physical and chemical parameters of the catalyst system, including nickel particle size (0.1-30% by weight), magnesium oxide content (10-50% by weight), and aluminum oxide content (5-35% by weight), to achieve maximum catalytic activity with base metals, thereby reducing dependence on expensive noble materials while maintaining productivity.
3Ease of operation
If catalyst beads are used for steam reforming, then catalytic function is provided, but mechanical strength is insufficient leading to breakage and powdering
Solution Approach 1:
The patent creates a composite bead structure where aluminum oxide serves as a structural framework providing mechanical strength, while magnesium oxide provides chemical stability and sulfur resistance, and nickel particles dispersed within provide catalytic activity. This multi-phase composite material achieves both functional performance and mechanical durability.
Solution Approach 2:
The catalyst beads are designed with a porous structure that provides high surface area for catalytic reactions while the interconnected pore network and solid framework maintain mechanical integrity. The porosity allows reactant and product diffusion while the robust structure prevents bead breakage during operation and regeneration cycles.
4Productivity
If high surface area support materials are used to enhance catalytic activity, then reaction efficiency improves, but mechanical strength and structural stability decrease
Solution Approach 1:
The patent combines aluminum oxide, which provides high surface area and porosity for catalytic activity, with magnesium oxide and additional aluminum oxide that form a structurally robust framework. The composite structure allows the high-surface-area component to provide catalytic sites while the structurally stronger components maintain mechanical integrity under operating conditions.
Solution Approach 2:
The catalyst structure exhibits local quality differentiation where different regions serve different functions: the aluminum oxide provides high-surface-area porous structures for catalytic reactions, while magnesium oxide-rich regions provide sulfur resistance and structural stability. This spatial differentiation of properties allows simultaneous optimization of catalytic activity and mechanical strength.
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 catalyst exhibits excellent anti-sulfur poisoning, anti-coking properties, and mechanical strength, maintaining high catalytic activity under low-steam conditions and extending operational life while reducing costs by using less expensive base metals.
Implementation Method 1
a porous catalyst body for decomposing hydrocarbons which comprises at least magnesium, aluminum and nickel
Implementation Method 2
The steam reforming (SR) is conducted according to the following reaction formula: CnH2n+2 + nH2O → nCO + (2n+1)H2
Implementation Method 3
CO + H2O → CO2 + H2
Data Source
AI summary
The present invention aims at providing a catalyst as a porous catalyst body for decomposing hydrocarbons which comprises at least magnesium, aluminum and nickel, wherein the catalyst has an excellent catalytic activity for decomposition and removal of hydrocarbons, an excellent anti-sulfur poisoning property, an excellent anti-coking property even under a low-steam condition, a sufficient strength capable of withstanding crushing and breakage even when coking occurs within the catalyst, and an excellent durability. The above aim of the present invention can be achieved by a porous catalyst body for decomposing hydrocarbons which comprises at least magnesium, aluminum and nickel in such a manner that the magnesium and aluminum are present in the form of a composite oxide of magnesium and aluminum, and the nickel is present in the form of metallic nickel; and which porous catalyst body has a magnesium element content of 10 to 50% by weight, an aluminum element content of 5 to 35% by weight and a nickel element content of 0.1 to 30% by weight, a pore volume of 0.01 to 0.5 cm3/g, an average pore diameter of not more than 300 Å and an average crushing strength of not less than 3 kgf.