UZM-29 Zeolite Catalyst Thermal Stability in Hydrocarbon Conversion
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Solution Overview
Problem
Current hydrocarbon conversion processes lack an effective catalyst that maintains thermal stability and specific structural characteristics for efficient hydrocarbon conversion reactions, particularly in high-temperature conditions.
Innovation Solution
Development of a new family of crystalline zeolites, UZM-29 and UZM-29HS, with a three-dimensional framework structure and specific empirical compositions, which are thermally stable up to 400°C and exhibit unique x-ray diffraction patterns, used as catalysts for hydrocarbon conversion processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional catalysts are used for hydrocarbon conversion, then the process can proceed under standard conditions, but thermal stability deteriorates at high temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of the zeolite catalyst by controlling the Si/Al ratio within specific ranges (2-10) and incorporating gallium substitution (x=0-1.0) to achieve optimal thermal stability while maintaining catalytic activity at elevated temperatures up to 400°C
Solution Approach 2:
The invention creates a composite zeolite structure combining silicon, aluminum, and gallium elements in a specific framework configuration, where the multi-element composition provides both thermal resistance and catalytic functionality, resolving the contradiction between thermal stability and catalytic performance
2Ease of manufacture
If existing zeolite structures are used, then catalyst synthesis is straightforward, but structural characteristics are insufficient for efficient hydrocarbon conversion
Solution Approach 1:
The patent introduces gallium substitution at specific framework positions within the zeolite structure (indicated by mole fraction x), creating localized active sites with enhanced catalytic properties while maintaining the overall ease of synthesis through conventional hydrothermal methods
3Stability of the object's composition
If high silica content is increased to improve thermal stability, then structural integrity improves, but catalytic activity may be reduced
Solution Approach 1:
The patent optimizes the Si/Al ratio within the range of 2-10 and controls gallium substitution levels (x=0-1.0) to achieve a balance where sufficient silica content provides structural integrity and thermal stability, while adequate aluminum and gallium content maintains catalytic activity for hydrocarbon conversion
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 UZM-29 and UZM-29HS zeolites provide enhanced thermal stability and structural properties, enabling efficient hydrocarbon conversion processes, including cracking, hydrocracking, and methanol to olefin conversion, with improved catalyst performance and product selectivity.
Implementation Method 1
UZM-29 and UZM-29HS zeolites provide enhanced thermal stability and structural properties, enabling efficient hydrocarbon conversion processes, including cracking, hydrocracking, and methanol to olefin conversion
Implementation Method 2
UZM-29HS is a high silica version of UZM-29... thermally stable up to a temperature of at least 400° C.
Implementation Method 3
characterized in that it has the x-ray diffraction pattern having at least the d-spacings and intensities set forth in Table A
Data Source
AI summary
This invention relates to hydrocarbon conversion processes using UZM-29 and UZM-29HS zeolitic compositions. The UZM-29 zeolites are represented by the empirical formula:Mmn+R+rAl1−xExSiyOz UZM-29 has the PHI structure type topology but is thermally stable up to a temperature of at least 350° C. UZM-29HS is a high silica version of UZM-29 and is represented by the empirical formula: M1′n+aAl(1−x)ExSiyOz. Examples of the hydrocarbon conversion processes are isomerization of alkanes, especially butane and the conversion of oxygenates to olefins.