Mesoporous Zeolite Catalysts for Propylene Selectivity
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Solution Overview
Problem
Current processes for producing propylene, such as steam-cracking and Methanol-to-Olefin (MTO), face challenges including high energy consumption, low propylene to ethylene selectivity, and the formation of undesirable by-products like methane, making it difficult to meet the increasing global demand for propylene efficiently.
Innovation Solution
Development of mesoporous zeolite-based catalyst compositions, specifically using large and medium pore zeolites with group 13 atoms like gallium, for dehydrocracking C3-C7 hydrocarbon feedstocks to produce C2-C4 olefins, including propylene, under mild conditions, reducing methane and ethylene formation and enhancing catalyst stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam-cracking process is used to produce propylene, then high yield of light olefins is achieved, but high thermal energy consumption and low propylene to ethylene ratio occur
Solution Approach 1:
The patent changes the operating temperature parameter from conventional high temperature (>800°C) to mild conditions (400-600°C), fundamentally altering the energy consumption profile while maintaining propylene production efficiency
Solution Approach 2:
The patent replaces the thermal cracking mechanism with a catalytic dehydrocracking mechanism using mesoporous zeolite catalysts, substituting thermal energy with catalytic activity to achieve lower operating temperatures
2Productivity
If steam-cracking process is used to produce propylene, then high yield of light olefins is achieved, but low propylene to ethylene ratio occurs
Solution Approach 1:
The patent modifies the catalyst structure with specific pore sizes and acid site distributions to create localized catalytic activity that selectively favors propylene formation over ethylene, achieving superior product ratio control
Solution Approach 2:
The patent uses composite mesoporous zeolite materials combining different zeolite phases (e.g., MCM-68, Y, ZSM-5) with tailored pore structures to simultaneously optimize both yield and product distribution
3Productivity
If conventional catalysts are used for dehydrocracking, then propylene production is achieved, but high coke deactivation and short catalyst cycle times occur
Solution Approach 1:
The patent utilizes mesoporous zeolite materials with optimized pore size distributions that facilitate reactant access and product egress while suppressing coke formation, thereby extending catalyst operational life
Solution Approach 2:
The patent converts the typically harmful effect of coke deposition into a beneficial selectivity filter by designing pore structures that channel coke formation away from active sites, maintaining catalyst activity over extended periods
4Productivity
If propane dehydrogenation process is used to produce propylene, then propylene is produced from LPG feed, but limited feedstock flexibility and high energy consumption occur
Solution Approach 1:
The patent develops a universal catalytic system that can process multiple feedstock types (naphtha, gas oil, heavy oil, synthetic fuels) through a single catalyst formulation, eliminating the need for separate processing units for different feeds
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 mesoporous zeolite-based catalysts achieve high selectivity towards propylene with reduced coke deactivation, longer catalyst cycle times, and improved propylene to ethylene ratios, addressing the inefficiencies of existing methods by providing a more efficient and stable process for propylene production.
Implementation Method 1
catalyst compositions including a catalyst compound and one or more group 13 metal... catalyst compound includes a large pore zeolite... processes for converting hydrocarbon feedstocks to small olefins
Data Source
AI summary
The present disclosure provides mesoporous catalyst compounds and compositions having one or more group 13 atoms. The present disclosure further relates to processes for converting hydrocarbon feedstocks to small olefins. In one aspect, a catalyst compound includes a zeolite having a structural type selected from MFI, MSE, MTW, Theta-One (TON), Ferrierite (FER), AFI, AFS, ATO, BEA, BEC, BOG, BPH, CAN, CON, EMT, EON, EZT, FAU, GME, GON, IFR, ISV, ITN, IWR, IWW, LTL, MAZ, MEI, MOR, MOZ, OFF, OKO, OSI, SAF, SAO, SEW, SFE, SFO, SSF, SSY, and USI, or a combination thereof, the zeolite having a silicon to aluminum molar ratio (Si/Al ratio) of from about 5 to about 40. In one aspect, a catalyst composition includes the catalyst compound and one or more group 13 metal.