Zeolite Catalyst Composition for Oxygenate Conversion
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Solution Overview
Problem
Current zeolite catalysts for converting oxygenates to aromatic hydrocarbons face challenges with selectivity and resistance to deactivation, leading to reduced aromatic yield and increased coke formation.
Innovation Solution
The development of zeolite-containing catalyst compositions enhanced with Group 10-12 and Group 15 elements, such as zinc and phosphorus, which maintain high aromatic selectivity and reduce catalyst deactivation, characterized by specific molar ratios and surface areas, and optionally including a binder, to improve the conversion efficiency and stability of oxygenates to aromatics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zeolite catalysts are used for converting oxygenates to aromatic hydrocarbons, then the catalytic activity is maintained, but the aromatic selectivity decreases and coke formation increases
Solution Approach 1:
The patent modifies the catalyst by changing the chemical composition parameters - specifically incorporating Group 10-12 elements (Ni, Pd, Pt, Cu, Ag, Au) and Group 15 elements (P, As, Sb, Bi) into the zeolite structure. This compositional parameter change alters the catalyst's selectivity to favor aromatic hydrocarbons while reducing coke formation, directly resolving the technical contradiction between maintaining catalytic activity and improving aromatic selectivity.
Solution Approach 2:
The patent creates a composite catalyst material by combining zeolite with specific metal elements (Group 10-12 and Group 15). This composite structure leverages the porous framework of zeolite for catalysis while the metal elements modify the electronic properties to enhance aromatic selectivity and reduce harmful coke formation, thereby resolving the contradiction between catalytic activity and selectivity.
2Productivity
If zeolite catalysts operate for extended periods, then productivity is maintained, but deactivation increases due to coke formation
Solution Approach 1:
By changing the compositional parameters of the catalyst - specifically adding metal elements from Groups 10-12 and 15 - the patent modifies the catalyst's resistance to deactivation. This parameter change enhances the catalyst's ability to maintain high aromatic yield over extended periods by reducing coke formation and improving structural stability, thereby resolving the contradiction between productivity and catalyst lifetime.
3Stability of the object's composition
If steam treatment is applied to the catalyst, then the catalyst structure is stabilized, but aromatic selectivity is reduced
Solution Approach 1:
The patent creates a composite zeolite-metal catalyst where the metal elements (Group 10-12 and Group 15) work synergistically with the zeolite framework. This composite structure provides both structural stability from the zeolite and enhanced aromatic selectivity from the metal elements, allowing the catalyst to maintain high aromatic yield even after steam treatment, thereby resolving the contradiction between structural stability and aromatic 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
These catalyst compositions achieve high aromatic yields with reduced deactivation, maintaining selectivity and minimizing coke formation, even under steam treatment, thereby enhancing the longevity and efficiency of the catalytic process.
Implementation Method 1
catalyst compositions enhanced with Group 10-12 and Group 15 elements... for the conversion of oxygenates to aromatic hydrocarbons
Data Source
AI summary
Catalyst compositions including a zeolite having a molar ratio of silicon to aluminum of about 10.0 to about 300.0; a Group 10-12 element and combinations thereof; a Group 15 element and combinations thereof; and optionally, a binder, wherein the catalyst composition has a molar ratio of Group 15 element to Group 10-12 element of about 0.01 to about 10.0 are disclosed. Methods of converting organic compounds to aromatics using such catalyst compositions are also disclosed.