Hydrogenation Catalyst Composition for Low-Hydrogen Ultra-Deep HDS
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Solution Overview
Problem
Existing diesel hydrogenation catalysts face challenges in achieving low-energy consumption, high catalytic activity, and stability, particularly in ultra-deep hydrodesulphurization and hydrodenitrogenation processes, which are crucial for clean diesel production under the 'dual-carbon' strategy.
Innovation Solution
A hydrogenation catalyst system comprising a support, Group VIII and Group VIB metals, phosphorus, and organic complexing agents, with a specific CO2 release spectrum and optimized metal ratios, combined with a grading system of two catalysts, enhances catalytic performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hydrodesulphurization catalysts are used for ultra-deep HDS, then sulfur removal efficiency is improved, but energy consumption and hydrogen consumption increase substantially
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by incorporating specific organic complexing agents (alcohols, carboxylic acids, or amines) along with phosphorus compounds. These compositional changes modify the catalyst's electronic and geometric properties, enabling efficient HDS activity under milder operating conditions with lower energy and hydrogen consumption
Solution Approach 2:
The patent creates a composite catalyst system combining Group VIII metals (Ni, Co), Group VIB metals (Mo, W), phosphorus compounds, and organic complexing agents on an alumina support. This composite structure synergistically enhances catalytic activity for HDS while reducing the harshness of operating conditions, thereby lowering energy and hydrogen consumption
2Reliability
If current hydrofining catalysts are used for low-quality diesel processing, then nitrogen compound removal is achieved, but hydrodenitrogenation activity and stability are insufficient
Solution Approach 1:
The patent optimizes the atomic ratios of metals (Ni: 0.6-1.2, Co: 0.6-1.2, Mo: 1.8-3.0, W: 1.8-3.0) and introduces organic complexing agents with specific molecular structures. These parameter changes enhance the catalyst's ability to activate nitrogen-containing compounds, improving both HDN activity and long-term stability
Solution Approach 2:
The organic complexing agents act as intermediaries that facilitate the interaction between the metal active sites and nitrogen-containing aromatic compounds. These agents modify the electronic environment of the metal centers, enhancing their ability to break C-N bonds while maintaining structural stability during prolonged operation
3Reliability
If harsh operating conditions are applied for ultra-deep hydrodesulphurization, then sulfur removal is enhanced, but aromatic saturation reactions consume substantial hydrogen
Solution Approach 1:
The patent creates localized active sites with specific electronic properties through the introduction of organic complexing agents around the metal centers. This local modification enables selective activation of sulfur-containing compounds while minimizing non-selective aromatic hydrogenation, thereby reducing hydrogen consumption
Solution Approach 2:
The patent changes the electronic state of metal active sites through coordination with organic ligands (alcohols, carboxylic acids, or amines). This electronic modification tunes the catalyst's selectivity toward HDS reactions over aromatic saturation, reducing hydrogen consumption while maintaining high sulfur removal efficiency
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 system improves active metal dispersion and synergistic effects, effectively removing sulfur and aromatics from distillate oil with reduced hydrogen consumption, suitable for clean diesel production.
Implementation Method 1
The catalyst includes a support and active metal components where the support provides adsorption sites for reactant molecules, concentrating them near the active sites to enhance reaction efficiency
Implementation Method 2
The catalyst promotes aromatic saturation reactions through hydrogenation, where hydrogen is added to aromatic rings to form cycloalkanes, improving diesel quality and stability
Implementation Method 3
The catalyst facilitates ultra-deep hydrodesulphurization reactions where sulfur atoms in organic compounds are removed through chemical reactions with hydrogen, producing hydrogen sulfide and purified hydrocarbons
Implementation Method 4
The catalyst promotes hydrodenitrogenation reactions where nitrogen atoms in organic compounds are removed through chemical reactions with hydrogen, producing ammonia and purified hydrocarbons
Data Source
AI summary
A hydrogenation catalyst, and preparation and use thereof are provided. The catalyst has a support and a hydrogenation active metal component, a phosphorus component and an organic complexing component supported on the support. The hydrogenation active metal component has a Group VIII metal and a Group VIB metal, the organic complexing component has an alcohol, a carboxylic acid, and/or an amine. The catalyst has a spectrum obtained by a temperature-programmed oxidation test exhibiting at least two CO2 release peaks, the first release peak being in the range of 200-300° C., the second release peak being in the range of 300-400° C. The ratio of the peak height of the first release peak to the peak height of the second release peak is in the range of 0.5-5:1.