MFI Zeolite Heat-Generating Catalyst for Thermally Neutral Cracking
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Solution Overview
Problem
Current hydrocarbon cracking processes, such as steam cracking and catalytic cracking, are energy-intensive and inefficient, with thermal cracking consuming 65% of total process energy and catalytic cracking having limited control over propylene to ethylene ratios, leading to high operational costs and environmental concerns.
Innovation Solution
A heat generating catalyst is developed by dispersing a metal oxide precursor within the microstructure of a cracking catalyst, which generates exothermic heat through reduction reactions, offsetting the endothermic hydrocarbon cracking process and achieving thermal neutrality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam cracking is used to produce light olefins, then high conversion of hydrocarbons is achieved, but energy consumption increases significantly (65% of total process energy)
Solution Approach 1:
The patent combines the endothermic cracking reaction and exothermic combustion reaction within the same reactor vessel. The combustion of a portion of the hydrocarbon feed provides heat in-situ to drive the cracking reaction, eliminating the need for external steam heating and achieving thermal self-sufficiency.
Solution Approach 2:
The patent converts the harmful effect of excessive heat generation from complete combustion into a beneficial feature by controlling partial combustion. The combusted hydrocarbons, which would normally be considered waste or harmful emissions, are utilized as an internal heat source to drive the endothermic cracking reaction, turning a potential disadvantage into the driving force of the process.
2Use of energy by moving object
If catalytic cracking is used to reduce energy consumption, then operating temperature decreases (500-650°C), but control over propylene to ethylene ratio is limited
Solution Approach 1:
The patent employs dynamic control of process parameters including the ratio of combusted to uncombusted feed, residence time, and temperature to optimize product distribution. This allows flexible adjustment of the propylene to ethylene ratio based on market demand while maintaining energy efficiency, transforming a static catalytic process into a dynamically controllable system.
3Use of energy by stationary object
If excess air is injected to promote complete combustion in the regenerator, then heat generation increases, but side reactions and operating costs increase significantly
Solution Approach 1:
The patent applies partial combustion by controlling the air-to-hydrocarbon ratio to be less than stoichiometric, intentionally leaving some hydrocarbon uncombusted. This partial action provides sufficient heat for the endothermic cracking reaction while avoiding the harmful effects of complete combustion such as excessive temperature, nitrogen oxide formation, and catalyst deactivation.
4Use of energy by stationary object
If torch oil is injected to the regenerator to provide additional thermal energy, then heat deficiency is overcome, but non-oxidized cracked products form causing hot spots and catalyst damage
Solution Approach 1:
The patent extracts the combustion step from the separate regenerator and integrates it directly into the cracking reactor. By combusting a controlled portion of the feed in-situ, the process eliminates the need for external fuel injection (torch oil) and avoids the formation of non-oxidized cracked products that cause hot spots and catalyst damage in conventional systems.
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 reduces energy input requirements, enhances conversion efficiency, and improves selectivity towards light olefins like ethylene and propylene, while minimizing hydrogen transfer reactions and reducing operational costs.
Implementation Method 1
generates exothermic heat through reduction reactions
Implementation Method 2
generates exothermic heat through reduction reactions
Implementation Method 3
catalyze the cracking reactions to break down the high molecular weight molecules into lighter components
Implementation Method 4
endothermic hydrocarbon cracking
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A method of making a heat generating catalyst for hydrocarbon cracking. The method includes providing at least one mordenite framework-inverted (MFI) zeolite having a Si/Al molar ratio of 15 or greater and providing at least one metal oxide precursor. Further, the at least one metal oxide precursor is dispersed within a microstructure of the MFI zeolite catalyst. The method additionally includes calcining the heat generating material with the at least one metal oxide precursor dispersed within the microstructure of the MFI zeolite catalyst to form at least one metal oxide in situ. The heat generating catalyst includes at least one MFI zeolite and and at least one metal oxide in a ratio between 50:50 and 95:5. Additionally, an associated method of using the heat generating catalyst in a hydrocarbon cracking process is provided.