Aromatization Catalyst Activity via Oxygenate Control
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Solution Overview
Problem
Conventional aromatization catalysts face deactivation due to the presence of water and oxygenates, leading to sintering of platinum and reduced catalyst productivity, despite the common practice of purging these substances from the system to maintain catalyst activity.
Innovation Solution
Introducing a controlled amount of oxygenates, such as water or oxygen-containing compounds, and nitrogenates into the aromatization process to activate and enhance the catalyst activity, specifically using non-acidic zeolite supports with Group VIII metals and halides, which counteracts the deactivation by maintaining desired process parameters like T eq across reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water and oxygenates are purged from the system to maintain catalyst activity, then catalyst deactivation is reduced, but catalyst productivity and activity are diminished
Solution Approach 1:
The invention changes the parameter of water/oxygenate concentration from near-zero (purged) to a controlled optimal range (1-50 ppmv), transforming water from a harmful impurity to a beneficial catalyst promoter that enhances platinum activity and prevents sintering
Solution Approach 2:
The invention converts water and oxygenates, traditionally viewed as harmful substances causing catalyst deactivation, into beneficial agents that enhance catalyst activity and stability when present at controlled low concentrations, thereby improving both reliability and productivity
2Stability of the object's composition
If water and oxygenates are purged from the system, then catalyst sintering is prevented, but catalyst life is reduced
Solution Approach 1:
The invention changes the parameter of water/oxygenate concentration from complete removal to controlled presence at 1-50 ppmv, where these substances stabilize catalyst composition and extend catalyst life without causing excessive sintering
3Productivity
If oxygenates are added to enhance catalyst activity, then aromatic production increases, but process complexity increases
Solution Approach 1:
The invention uses self-service by allowing trace water and oxygenates to naturally present in the feedstock or hydrogen recycle stream, eliminating the need for complex addition systems while still achieving catalyst enhancement and improved aromatic production
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 controlled addition of oxygenates and nitrogenates increases catalyst activity, extends catalyst life, enhances aromatic production, and improves fouling characteristics, allowing for higher aromatic yields and selectivity while maintaining reactor temperatures and space velocities.
Implementation Method 1
contacting the enhanced hydrocarbon stream, or the enhanced hydrogen recycle stream, with an aromatization catalyst in a reaction zone... recovering an effluent comprising aromatic hydrocarbons
Implementation Method 2
Conventional aromatization catalysts face deactivation due to the presence of water and oxygenates, leading to sintering of platinum... The controlled addition of oxygenates and nitrogenates increases catalyst activity, extends catalyst life
Data Source
Figure 1
Figure 2A~2D
Figure 3A
AI summary
A hydrocarbon aromatization process comprising adding a nitrogenate, an oxygenate, or both to a hydrocarbon stream to produce an enhanced hydrocarbon stream, and contacting the enhanced hydrocarbon stream with an aromatization catalyst, thereby producing an aromatization reactor effluent comprising aromatic hydrocarbons, wherein the catalyst comprises a non-acidic zeolite support, a group VIII metal, and one or more halides. Also disclosed is a hydrocarbon aromatization process comprising monitoring the presence of an oxygenate, a nitrogenate, or both in an aromatization reactor, monitoring at least one process parameter that indicates the activity of the aromatization catalyst, modifying the amount of the oxygenate, the nitrogenate, or both in the aromatization reactor, thereby affecting the parameter.