Metal-Modified Zeolite Catalyst for Aromatization
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Solution Overview
Problem
Existing catalysts for aromatizing hydrocarbons suffer from low yields of monoaromatic products and produce undesirable light gases, necessitating improved catalyst compositions and processes that enhance selectivity towards aromatic hydrocarbon compounds.
Innovation Solution
A catalyst composition featuring at least two different metal modifiers dispersed on a hydrogen-form medium pore size zeolite support, specifically selected from IUPAC Groups 3-12 and lanthanide metals, is used to contact hydrocarbons, promoting chemical reactions that form aromatic hydrocarbons while minimizing light gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional catalysts are used for aromatizing hydrocarbons, then the conversion process can proceed, but the yield of monoaromatic products is low and undesirable light gases are produced
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by incorporating specific metal modifiers (Ga, Zn, La, Ce, or Pr) at controlled weight percentages (0.1-10% for Ga, 0.1-5% for Zn, 0.1-2% for La, Ce, or Pr) on the ZSM-5 zeolite support. This parameter optimization enhances the catalyst's ability to produce monoaromatics while suppressing light gas formation through modified reaction pathways.
Solution Approach 2:
The patent creates a composite catalyst material combining ZSM-5 zeolite support with multiple metal modifiers (Ga, Zn, La, Ce, or Pr). This composite structure synergistically combines the shape-selective properties of ZSM-5 with the catalytic activity of metal modifiers, achieving high monoaromatic yields and reduced light gas production through coordinated catalytic functions.
2Quantity of substance
If existing catalyst compositions are used, then the aromatization reaction can occur, but selectivity toward monoaromatic compounds is insufficient
Solution Approach 1:
The patent introduces local quality enhancement by depositing metal modifiers at specific locations and concentrations on the ZSM-5 zeolite surface. The metal modifiers are distributed at controlled weight percentages (0.1-10% for Ga, 0.1-5% for Zn, 0.1-2% for La, Ce, or Pr) to create localized active sites that preferentially catalyze monoaromatic formation while suppressing competing reactions that produce light gases.
Solution Approach 2:
The patent optimizes catalyst composition parameters by selecting specific metal modifiers (Ga, Zn, La, Ce, or Pr) at precise weight percentages. This parameter control modifies the catalyst's selectivity properties, enhancing monoaromatic production and reducing light gas formation through optimized reaction pathways and suppressed side reactions.
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 similar or improved yields of aromatic hydrocarbons compared to existing catalysts, with a significant reduction in less valuable light gases, thereby increasing the production of valuable aromatic compounds like benzene, toluene, and xylenes.
Implementation Method 1
contacting the hydrocarbons with a catalyst comprising at least two different metal modifiers dispersed on surfaces of a hydrogen-form medium pore size zeolite support causes at least a portion of the hydrocarbons to undergo a chemical reaction to form aromatic hydrocarbons
Data Source
AI summary
Embodiments of the present disclosure are directed to processes for aromatizing hydrocarbons includes contacting the hydrocarbons with a catalyst including at least two different metal modifiers dispersed on surfaces of a hydrogen-form medium-pore zeolite support. Each of the at least two different metal modifiers comprises a metal selected from the group consisting of IUPAC Groups 3-12, and lanthanide metals, and the catalyst is substantially free of gallium. Contacting the hydrocarbons with the catalyst causes a least a portion of the hydrocarbons to undergo a chemical reaction to form aromatic hydrocarbons.