Molecular Sieve Catalyst with 8-Membered Ring Channels for MTP
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Solution Overview
Problem
Current MTP catalysts, primarily using ZSM-5 molecular sieves, face challenges in achieving high single-pass selectivity and conversion rates for propylene production, limiting their efficiency in methanol-to-propylene (MTP) reactions.
Innovation Solution
Development of a molecular sieve catalyst with one-dimensional 8-membered ring channels, specifically designed to accommodate substances with diameters between 2.0 Å and 6 Å, utilizing transition metal-substituted aluminophosphate molecular sieves, and a preparation method involving transition metal raw materials, aluminum sources, phosphorus sources, templating agents, and solvents to enhance catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ZSM-5 molecular sieve is used as MTP catalyst, then the catalyst has suitable pore size and acid properties, but the single-pass selectivity to propylene is limited
Solution Approach 1:
The patent changes the pore diameter parameter of the molecular sieve from conventional sizes to specifically 2.0-6 Å by selecting appropriate crystal structures (AFN, DFT, PHI, SIV, THO, APD, CAS, EDI, GIS, VNI). This parameter optimization enables high propylene selectivity (>60%) while maintaining catalyst stability, directly resolving the contradiction between selectivity and reliability.
2Productivity
If conventional MTP catalysts are used, then the process can operate continuously, but the conversion rate and selectivity cannot be improved simultaneously
Solution Approach 1:
The patent applies local quality by creating specific pore environments within the molecular sieve structure. The 2.0-6 Å pores provide localized confinement effects that favor propylene formation and diffusion, while the overall catalyst structure maintains high conversion activity. This local structural optimization enables simultaneous achievement of >80% conversion rate and >60% propylene selectivity.
Solution Approach 2:
The patent uses composite molecular sieve structures combining specific framework types (AFN, DFT, PHI, SIV, THO, APD, CAS, EDI, GIS, VNI) with controlled pore dimensions. These composite structures integrate both high activity sites for conversion and selective pores for propylene formation, resolving the contradiction between productivity and manufacturing precision.
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 a conversion rate of over 80% and a single-pass propylene selectivity greater than 60%, significantly improving upon existing technologies by offering a versatile composition that can drive MTP reactions effectively.
Implementation Method 1
there is at least one-dimensional 8-membered ring small hole channel in the molecular sieve structure, the diameter of a diffusible substance in the direction of the 8-membered ring channel is no less than 2.0 Å, the diameter of a substance that can be accommodated in the molecular sieve structure is no more than 6 Å
Implementation Method 2
the diameter of a diffusible substance in the direction of the 8-membered ring channel is no less than 2.0 Å
Data Source
AI summary
The present application discloses a catalyst, the catalyst contains a molecular sieve, there is at least one-dimension 8-membered ring channel in the molecular sieve structure, the diameter of a diffusible substance in the direction of the 8-membered ring channel is no less than 2.0 Å, the diameter of a substance that can be accommodated in the molecular sieve structure is no more than 6 Å; the catalyst is used for a methanol and/or dimethyl ether to propylene reaction, comprising contacting methanol and/or dimethyl ether with a methanol-to-propylene catalyst to obtain propylene.