Ni-Based Catalyst for Syngas Production via Tri-Reforming
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Solution Overview
Problem
Current methods for converting light hydrocarbons and carbon dioxide into syngas face challenges such as carbon deposition, high costs due to hydrogen separation, and greenhouse gas emissions, with existing catalysts lacking thermal stability and resistance to contaminants, making it difficult to produce syngas with the desired H2/CO ratio for diesel fuel production.
Innovation Solution
A process utilizing a high-performance Ni-based solid solution catalyst for dry, steam, and tri-reforming conditions, combined with a second catalyst containing cobalt and specific metals supported on silica or alumina, to efficiently convert light hydrocarbons and carbon dioxide into high-quality syngas with a customizable H2/CO ratio, minimizing carbon deposition and eliminating the need for hydrogen separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If dry reforming is used to convert methane and carbon dioxide into syngas, then carbon dioxide is converted into useful product, but rapid carbon deposition occurs and the H2/CO ratio is approximately 1.0 which is not suitable for fuel production
Solution Approach 1:
The patent combines multiple reforming reactions (steam reforming, partial oxidation, and dry reforming) into a single integrated process called tri-reforming. This merging allows the system to simultaneously achieve high carbon dioxide conversion, maintain appropriate H2/CO ratio (1.5-2.5:1), and minimize carbon deposition by balancing the complementary effects of different reactions.
Solution Approach 2:
The patent optimizes key process parameters including temperature (700-900°C), pressure (1-10 atm), and feedstock ratios (steam-to-methane, oxygen-to-methane, carbon dioxide-to-methane) to control the balance between syngas production and carbon deposition. By adjusting these parameters, the system achieves high conversion while maintaining low coke formation and appropriate syngas composition.
2Productivity
If conventional catalysts are used for syngas production, then basic conversion occurs, but the catalysts lack thermal stability and resistance to contaminants
Solution Approach 1:
The patent employs composite catalyst formulations combining nickel with refractory metal oxides (such as magnesium oxide, calcium oxide, or strontium oxide) and promotional metals (such as ruthenium, rhodium, or iridium). This composite structure provides both high catalytic activity for syngas production and enhanced thermal stability and contaminant resistance, allowing the catalyst to maintain performance under severe operating conditions.
Solution Approach 2:
The refractory metal oxides in the catalyst formulation act as intermediaries that stabilize the active nickel sites and prevent sintering and coke deposition. These intermediary materials protect the catalyst structure from degradation by contaminants and high temperatures while maintaining catalytic functionality.
3Ease of manufacture
If syngas is produced with incorrect H2/CO ratio, then production cost increases due to hydrogen separation, but adjusting the ratio requires complex process modifications
Solution Approach 1:
The patent controls the H2/CO ratio by adjusting process parameters including steam-to-methane ratio, oxygen-to-methane ratio, carbon dioxide-to-methane ratio, and reaction temperature. By optimizing these parameters, the system directly produces syngas with the desired H2/CO ratio (1.5-2.5:1) suitable for Fischer-Tropsch synthesis, eliminating the need for downstream hydrogen separation units and complex ratio adjustment processes.
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 high conversion efficiencies of light hydrocarbons with minimal carbon formation, maintaining catalyst stability and reducing greenhouse emissions, enabling the direct production of diesel fuel without refining hydrocarbon waxes, thus lowering capital and operating costs.
Implementation Method 1
A process utilizing a high-performance Ni-based solid solution catalyst for dry, steam, and tri-reforming conditions
Implementation Method 2
converting light hydrocarbons and carbon dioxide into high quality syngas
Implementation Method 3
utilizing a high-performance Ni-based solid solution catalyst for dry, steam, and tri-reforming conditions
Implementation Method 4
a second catalyst containing cobalt and specific metals supported on silica or alumina, to efficiently convert light hydrocarbons and carbon dioxide into high-quality syngas with a customizable H2/CO ratio
Implementation Method 5
utilizing a high-performance Ni-based solid solution catalyst for dry, steam, and tri-reforming conditions
Data Source
AI summary
The present invention describes a process and catalysts for the conversion of a light hydrocarbon and carbon dioxide input stream into high quality syngas with the subsequent conversion of the syngas into fuels or chemicals. In one aspect, the present invention provides an efficient, solid solution catalyst for the production of a carbon containing gas from carbon dioxide and light hydrocarbons. The catalyst comprises a single transition metal, and the transition metal is nickel.