Catalyst for Light Aromatics via Selective Hydrogenation
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Solution Overview
Problem
Existing methods for producing light aromatics from heavy aromatics suffer from low hydrogenation selectivity and yield, limiting the efficient conversion of polycyclic aromatics to monocyclic aromatics.
Innovation Solution
A catalyst comprising specific metal elements such as Pt, Pd, and Ir, combined with other metals like Mo, W, Re, and Zn, supported on a carrier with a high hydrogen desorption temperature, enhances selective hydrogenation activity by adjusting the electronic properties and adsorption strength, improving the conversion of polycyclic aromatics to monocyclic aromatics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrogenation catalysts are used to convert polycyclic aromatics to monocyclic aromatics, then the conversion process can proceed, but the hydrogenation selectivity is low and monocyclic aromatics are over-hydrogenated to saturated compounds
Solution Approach 1:
The patent modifies the electronic properties of the active metal sites by adjusting the composition and structure of the catalyst, specifically using a supported metal catalyst with controlled metal loading and support characteristics. This changes the adsorption strength and hydrogenation activity to achieve selective conversion of polycyclic aromatics while preserving monocyclic aromatics.
Solution Approach 2:
The patent employs a composite catalyst system consisting of metal particles dispersed on a supported material. The combination of the metal component (providing hydrogenation activity) and the support (providing dispersion and electronic modification) creates a composite material with optimized selectivity for converting polycyclic aromatics to monocyclic aromatics while minimizing over-hydrogenation.
2Productivity
If hydrogenation activity is increased to improve conversion rate, then productivity increases, but selectivity decreases and monocyclic aromatics are over-hydrogenated
Solution Approach 1:
The patent optimizes the hydrogenation activity parameters by controlling metal loading, particle size, and support characteristics. This allows the catalyst to maintain high conversion rates while preserving selectivity through modified electronic properties that favor polycyclic aromatic hydrogenation over monocyclic aromatic hydrogenation.
Solution Approach 2:
The patent creates catalysts with localized active sites having specific electronic properties. The supported metal structure provides localized regions of high hydrogenation activity that are selective for polycyclic aromatics, while the overall catalyst maintains lower activity toward monocyclic aromatics, thus achieving both high productivity and selectivity.
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 achieves high polycyclic aromatics selective hydrogenation ratios with low monocyclic aromatics loss, thereby increasing the yield of light aromatics in the hydrogenation process.
Implementation Method 1
selective hydrogenation of polycyclic aromatics so as to produce monocyclic aromatics
Implementation Method 2
adjusting the electronic properties and adsorption strength
Data Source
AI summary
A catalyst for producing light aromatics with heavy aromatics, a method for preparing the catalyst, and a use thereof are disclosed. The catalyst comprises a carrier, component (1), and component (2), wherein component (1) comprises one metal element or more metal elements selected from a group consisting of Pt, Pd, Ir, and Rh, and component (2) comprises one metal element or more metal elements selected from a group consisting of IA group, IIA group, IIIA group, IVA group, IB group, IIB group, IIIB group, IVB group, VB group, VIB group, VIIB group, La group, and VIII group other than Pt, Pd, Ir, and Rh. The catalyst can be used for producing light aromatics with heavy aromatics, whereby heavy aromatics hydrogenation selectivity and light aromatics yield can be improved.