Porous Solid Acid Catalyst for Light Olefin Production
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Solution Overview
Problem
Conventional methods for producing light olefins, such as steam cracking and fluid catalytic cracking, face challenges in energy efficiency, economic viability, and catalyst deactivation, with difficulties in controlling olefin composition and requiring high reaction temperatures, which limits the yield and selectivity of ethylene and propylene production.
Innovation Solution
A novel porous solid acid catalyst is developed through a pillaring reaction and solid state reaction of a raw material mixture comprising HZSM-5, layered compounds, Al2O3, P2O5, SiO2, and B2O3, which is pelletized and heat-treated to achieve a specific crystalline structure, enhancing catalytic performance and stability for producing light olefins at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam cracking process is used to produce light olefins, then high conversion efficiency is achieved, but high temperature (800-900°C) and high energy consumption are required
Solution Approach 1:
The patent changes the reaction temperature parameter from conventional high temperature (800-900°C) to lower temperature (500-750°C) by introducing a modified catalyst system with controlled acidity and porosity, thereby reducing energy consumption while maintaining conversion efficiency
Solution Approach 2:
The patent uses a composite catalyst material combining HZSM-5 zeolite with specific pore structure modifiers and acidic components to achieve high conversion efficiency at lower temperatures, replacing the need for high-temperature steam cracking
2Power
If HZSM-5 catalyst is used without pelletization and steam is not introduced, then initial activity is excellent, but catalyst deactivation occurs readily
Solution Approach 1:
The catalyst is pelletized before use to create a stable physical structure that prevents dusting and improves mechanical strength, and steam is introduced during the reaction to maintain pore structure and prevent deactivation, performing protective actions in advance
Solution Approach 2:
Steam is introduced as an inert gas environment during the reaction to protect the catalyst from deactivation by preventing coke accumulation and maintaining pore structure, creating a protective atmosphere around the catalyst
3Productivity
If conventional catalysts are used to control olefin composition, then some selectivity is achieved, but it is not easy to control the composition of produced olefins
Solution Approach 1:
The catalyst is designed with specific local properties including controlled acidity distribution, optimized pore size distribution, and selective active sites that favor specific olefin productions, enabling precise control over olefin composition through localized catalytic activity
4Productivity
If light naphthas are used as feedstock, then high quality light olefins are produced, but the feedstock is more expensive than full range naphthas
Solution Approach 1:
The catalyst modifies the reaction parameters to enable efficient conversion of full range naphthas (cheaper feedstock) into high-quality light olefins, changing the economic viability by making lower-cost feedstock suitable for high-value product 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 catalyst achieves high yield and selectivity for light olefins, such as ethylene and propylene, with improved energy efficiency and economic feasibility, using full range naphthas as feedstock, while maintaining catalyst stability and reducing energy consumption compared to conventional methods.
Implementation Method 1
a porous solid acid catalyst for producing light olefins, which comprises a product of (i) pillaring reaction and (ii) solid state reaction
Implementation Method 2
a porous solid acid catalyst for producing light olefins, which comprises a product of (i) pillaring reaction and (ii) solid state reaction
Implementation Method 3
a porous solid acid catalyst for producing light olefins... exhibits excellent selectivity to light olefins at a low temperature
Implementation Method 4
solid acid catalyst... catalytic cracking process
Data Source
AI summary
A porous solid acid catalyst for producing light olefins is prepared through pillaring and a solid state reaction of a raw material mixture. The catalyst is made of a porous material having a crystalline structure that is different from that of the raw material mixture. The catalyst exhibits excellent catalytic activity (i.e., conversion and selectivity) in the production of light olefins from hydrocarbon feeds such as full range naphthas.