Composite Zeolite Catalyst for Propylene Production
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Solution Overview
Problem
The existing methods for producing propylene, such as the steam cracking process, are energy-intensive and face challenges in maintaining catalyst longevity due to coke generation, which reduces the efficiency and longevity of zeolite catalysts used in fixed bed systems.
Innovation Solution
A composite catalyst comprising a crystalline aluminosilicate zeolite with gallium and iron, combined with silicon dioxide as a binding agent, is developed to suppress coke generation and extend catalyst lifetime by reducing aromatic hydrocarbon production, allowing for efficient and continuous propylene production over a long period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a zeolite catalyst is used for propylene production, then energy consumption is reduced and propylene selectivity is improved, but catalyst lifetime is shortened due to coke generation
Solution Approach 1:
The patent uses a composite catalyst consisting of zeolite crystals combined with a binding agent (such as alumina, silica, or titania). This composite structure allows the zeolite to maintain its catalytic activity for propylene production while the binding agent provides structural stability and resistance to coke deposition, thereby extending catalyst lifetime without sacrificing energy efficiency or propylene selectivity.
2Ease of manufacture
If a fixed bed system is used instead of fluidized bed, then equipment cost is reduced, but catalyst lifetime is shortened due to coke accumulation
Solution Approach 1:
The composite catalyst structure combines zeolite with a binding agent that provides thermal stability and resistance to coke accumulation. This allows the fixed bed system to operate with extended catalyst lifetime, compensating for the higher coke accumulation inherent in fixed bed configurations compared to fluidized bed systems.
Solution Approach 2:
The patent modifies the catalyst composition by introducing a binding agent with specific properties (alumina, silica, or titania) that change the physical and chemical parameters of the catalyst system. This enables the catalyst to resist coke deposition and maintain activity over extended periods in fixed bed operation.
3Productivity
If reaction temperature is increased to maintain catalytic activity, then production rate is improved, but coke generation increases and catalyst lifetime decreases
Solution Approach 1:
The binding agent in the composite catalyst structure provides thermal stability that allows the catalyst to maintain high catalytic activity at elevated temperatures without generating excessive coke. The binding agent acts as a thermal buffer and structural support, enabling the zeolite to operate at higher temperatures with reduced coke accumulation.
Solution Approach 2:
The binding agent serves as an intermediary between the zeolite catalyst and the reaction environment. It mediates the thermal and chemical stresses of high-temperature operation, protecting the zeolite from direct exposure to conditions that would otherwise cause excessive coke generation while maintaining high production rates.
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 composite catalyst effectively extends the lifespan of the zeolite catalyst by reducing coke formation, maintaining catalytic activity, and enhancing energy efficiency, enabling stable and prolonged production of propylene with reduced energy consumption.
Implementation Method 1
a zeolite being a crystalline aluminosilicate containing gallium and iron or iron and further having a framework with 8- to 12-membered ring
Implementation Method 2
a zeolite catalyst has an acid point as a solid acid, and at this acid point a hydrocarbon molecule to be a feedstock is decomposed and further dehydrogenated to generate a lower olefin
Implementation Method 3
silicon dioxide as a binding agent (binder) into a composite, the generation amount of coke is reduced by suppressing the generation of aromatic hydrocarbon
Data Source
AI summary
A lower olefin by using a zeolite catalyst, a composite catalyst capable of further extending the lifetime of catalytic activity, a method for producing the composite catalyst, a method for producing a lower olefin by using the composite catalyst, and a method for regenerating a composite catalyst in the method for producing a lower olefin are provided. The composite catalyst is a catalyst for producing a lower olefin from a hydrocarbon feedstock. This composite catalyst is constituted of a zeolite being a crystalline aluminosilicate containing gallium and iron or iron and further having a framework with 8- to 12-membered ring, and of silicon dioxide. By using the composite catalyst, a lower olefin can be continuously produced over a long period of time.