Germanium Silicalite Catalyst for Aromatics Selectivity
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Solution Overview
Problem
Current zeolite catalysts for hydrocarbon conversion, particularly in aromatization processes, face challenges in achieving high selectivity for aromatics and long catalyst life.
Innovation Solution
A novel silicalite catalyst with germanium incorporated within its framework, prepared by reacting a silica-containing silicalite precursor with a germanium source under controlled conditions, and optionally depositing a noble metal like platinum, to enhance catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zeolite catalysts are used for aromatization, then the process can proceed, but selectivity for aromatics is insufficient and catalyst life is short
Solution Approach 1:
The patent changes the chemical composition parameters of the zeolite catalyst by incorporating germanium into the silicalite framework and controlling the silica-alumina ratio. This compositional modification transforms the catalyst's properties to achieve both high aromatic selectivity and extended catalyst life, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The invention creates a composite catalyst system by combining silicalite with germanium and optionally noble metals. This composite structure integrates the benefits of different materials: silicalite provides the framework, germanium enhances stability and selectivity, and noble metals further catalyze the aromatization reaction, achieving both high productivity and reliability.
2Productivity
If germanium content is increased to improve selectivity, then aromatic production increases, but catalyst stability may be compromised
Solution Approach 1:
The patent optimizes the germanium content parameter within a specific range (0.05-8% by weight) and controls the silica-alumina ratio to achieve the desired balance. By precisely adjusting these compositional parameters, the catalyst achieves high aromatic selectivity while maintaining framework stability, resolving the contradiction between productivity and compositional stability.
3Productivity
If high silica-alumina ratio is used to improve selectivity, then aromatic formation is enhanced, but catalyst deactivation occurs faster
Solution Approach 1:
The invention creates a composite catalyst system by combining silicalite with germanium and optionally noble metals. This composite structure integrates the benefits of different materials: silicalite provides the framework, germanium enhances stability and selectivity, and noble metals further catalyze the aromatization reaction, achieving both high productivity and reliability.
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 germanium-containing silicalite catalyst demonstrates improved selectivity for aromatic compounds and extended catalyst life, outperforming standard Ge-ZSM-5 catalysts in aromatization reactions, with reduced deactivation rates and sustained conversion efficiency over time.
Implementation Method 1
allowing the reactants of the reaction mixture to react while maintaining a temperature of 55° C. or less, adjusting the pH of the reacted reaction mixture, if necessary, so that the reacted reaction mixture has a pH of 12 or less, and heating the reacted reaction mixture under conditions to form crystals of a silicalite having germanium included within the framework of the silicalite
Implementation Method 2
heating the reacted reaction mixture under conditions to form crystals of a silicalite having germanium included within the framework of the silicalite
Implementation Method 3
The crystals are then calcined to form the final catalyst
Data Source
AI summary
A catalyst and its preparation and use are disclosed. The catalyst is a silicalite having germanium (Ge) included within the framework of the silicalite prepared in a particular manner. The catalyst may be used in a method of converting hydrocarbons wherein a hydrocarbon feed is contacted with the catalyst. The catalyst may be formed by preparing an aqueous reaction mixture of a silica-containing silicalite precursor material and a germanium source. The reactants of the reaction mixture are allowed to react. The reacted reaction mixture is heated under conditions to form crystals of a silicalite having germanium included within the framework of the silicalite. The crystals are then calcined to form the catalyst. In certain embodiments, a noble metal may be deposited upon the germanium-containing silicalite.