Molybdenum Amine Complex Catalyst for Lower-Pressure Coal Liquefaction
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Solution Overview
Problem
Existing catalysts for direct coal liquefaction, particularly iron-based catalysts, have low catalytic activity and are costly, while transition metals like Mo and Ni, though effective, are expensive and require improvements in catalytic efficiency and selectivity.
Innovation Solution
A molybdenum amine complex catalyst is prepared by reacting a hexavalent molybdenum compound with an aliphatic amine in a hydrocarbon dispersion medium, achieving uniform dispersion and high molybdenum content, which is then used in direct coal liquefaction with a sulfur source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If iron-based catalysts are used for direct coal liquefaction, then cost is reduced, but catalytic activity becomes insufficient
Solution Approach 1:
The patent uses a composite catalyst system combining iron-based catalysts with organic complexing agents (amines, carboxylic acids, or their derivatives). This composite approach allows the inexpensive iron-based catalyst to achieve enhanced catalytic activity comparable to expensive transition metal catalysts, resolving the contradiction between cost and catalytic activity.
2Reliability
If transition metals (Mo, Ni) are used for direct coal liquefaction, then catalytic activity and heteroatom removal ability are improved, but cost increases significantly
Solution Approach 1:
The patent employs inexpensive iron-based catalysts that can be used in direct coal liquefaction processes without requiring the expensive transition metals like Mo and Ni. The organic complexing agents enhance the activity of these cheap iron-based catalysts, making them effective substitutes for expensive transition metal catalysts.
3Stability of the object's composition
If physical grinding is used to reduce catalyst particle size, then dispersion is improved, but power consumption and material loss increase
Solution Approach 1:
The patent replaces mechanical grinding with chemical complexation methods. Organic complexing agents are used to form soluble or dispersible complexes with metal catalysts, achieving fine dispersion without the need for high-energy mechanical grinding processes. This substitution eliminates significant power consumption and material loss associated with grinding.
4Reliability
If multiple active metal components are added to catalyst, then catalytic performance is improved, but metal loss during filtration and washing increases
Solution Approach 1:
The patent uses composite complexes formed by combining multiple metal components (Fe, Mo, Ni) with organic complexing agents. These organic complexes improve catalytic performance while the organic ligands help retain metal components during filtration and washing, reducing metal loss compared to using multiple separate metal salts.
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 molybdenum amine complex catalyst enhances coal and asphaltene/preasphaltene conversion to oil, reducing reaction pressure requirements while maintaining oil yield comparable to iron-based catalysts, with improved stability and applicability to various coal types.
Implementation Method 1
reacting a hexavalent molybdenum compound with at least one aliphatic amine compound having C4 or more carbon atom in the presence of a dispersion medium hydrocarbon oil to obtain an active metal catalyst precursor
Implementation Method 2
The molybdenum amine complex catalyst enhances coal and asphaltene/preasphaltene conversion to oil
Data Source
AI summary
The present disclosure discloses a molybdenum amine complex catalyst and a preparation method and use thereof, wherein, the method for preparing the molybdenum amine complex catalyst comprises the following steps: in the presence of a dispersion medium hydrocarbon oil, reacting a hexavalent molybdenum compound with at least one aliphatic amine compound having C4 or more carbon atoms to obtain an active metal catalyst precursor, and uniformly dispersing the active metal catalyst precursor in the dispersion medium hydrocarbon oil to obtain the molybdenum amine complex catalyst. When the molybdenum amine complex catalyst of the present disclosure is applied to the direct coal liquefaction reaction, it can significantly improve the conversion rate of coal and the conversion rate of asphaltene and preasphaltene to oil, allowing the required reaction pressure to be significantly reduced while achieving an oil yield comparable to that of the iron-based catalyst.