Phosphorus-Modified Molecular Sieve Catalysts for Hydrothermal Stability
Solution Overview
Problem
Existing catalytic cracking processes using phosphorus-modified ZSM-5 molecular sieves face issues with hydrothermal stability and require complex preparation processes, leading to high costs and reduced efficiency.
Innovation Solution
A simplified preparation process for catalytic cracking agents involving phosphorus-modified molecular sieves, including a hydrothermal calcining treatment under controlled pressure and moisture conditions, which enhances the coordination of phosphorus with framework aluminum, improving hydrothermal stability and cracking activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-modified ZSM-5 molecular sieve is used to improve hydrothermal stability, then the framework aluminum coordination is enhanced, but the preparation process becomes complex and costly
Solution Approach 1:
The patent applies preliminary action by pre-mixing phosphorus-containing compounds with the molecular sieve before the calcination process. This preliminary mixing ensures uniform phosphorus distribution and facilitates better coordination with framework aluminum during the subsequent hydrothermal treatment, simplifying the overall preparation process while maintaining hydrothermal stability.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the hydrothermal treatment conditions, specifically controlling temperature (200-800°C), pressure (0.01-1.0 MPa), and water vapor content (1-100%). By adjusting these parameters, the patent achieves effective phosphorus coordination with framework aluminum to enhance hydrothermal stability without requiring complex multi-step preparation procedures.
2Reliability
If conventional phosphorus modification process is used, then hydrothermal stability is improved, but production cost increases
Solution Approach 1:
The patent merges the phosphorus modification step with the existing calcination process. By combining these operations into a single integrated process step, the patent eliminates separate modification and calcination stages, thereby reducing production costs while maintaining the hydrothermal stability enhancement through phosphorus coordination with framework aluminum.
Solution Approach 2:
The patent employs parameter changes by optimizing the hydrothermal treatment conditions (temperature: 200-800°C, pressure: 0.01-1.0 MPa, water vapor: 1-100%) to achieve effective phosphorus coordination. This optimized parameter set allows for cost-effective production by reducing energy consumption and process time while maintaining high hydrothermal stability.
3Productivity
If phosphorus is introduced to stabilize framework aluminum, then cracking activity is enhanced, but the preparation process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-mixing phosphorus-containing compounds with the molecular sieve before calcination. This ensures uniform phosphorus distribution throughout the material, which facilitates better coordination with framework aluminum during hydrothermal treatment, thereby enhancing cracking activity while simplifying the preparation process.
Solution Approach 2:
The patent uses water vapor as an intermediary medium during the hydrothermal treatment process. The water vapor facilitates the coordination between phosphorus and framework aluminum by providing a controlled humid environment that promotes phosphorus incorporation and stabilization, thereby enhancing cracking activity without requiring complex dry-processing steps.
4Reliability
If hydrothermal calcining treatment is performed under controlled pressure and moisture, then phosphorus coordination with framework aluminum is enhanced, but energy consumption increases
Solution Approach 1:
The patent employs parameter changes by optimizing the hydrothermal treatment conditions, specifically temperature (200-800°C), pressure (0.01-1.0 MPa), and water vapor content (1-100%). By adjusting these parameters to optimal values, the patent achieves effective phosphorus coordination with framework aluminum while minimizing energy consumption through reduced processing time and temperature optimization.
Solution Approach 2:
The patent applies continuity of useful action by maintaining controlled hydrothermal conditions throughout the entire calcination process. This continuous exposure to water vapor and optimized temperature/pressure conditions ensures consistent phosphorus coordination with framework aluminum, maximizing the useful action while minimizing energy waste through efficient, uninterrupted processing.
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 process results in improved hydrothermal stability and cracking activity, with enhanced yields of lower carbon olefins and liquefied gas, reducing production costs and simplifying the preparation process.
Implementation Method 1
enhances the coordination of phosphorus with framework aluminum, improving hydrothermal stability
Implementation Method 2
a hydrothermal calcining treatment is performed on the shaped bodies under an atmosphere condition in which an external pressure is applied and an aqueous solution is externally added
Implementation Method 3
under an atmosphere condition in which an external pressure is applied
Implementation Method 4
catalytic cracking agent containing a phosphorus-modified molecular sieve... enhanced yields of lower carbon olefins and liquefied gas
Data Source
AI summary
A catalytic cracking agent has an active component consisting of a phosphorus-modified molecular sieve and a non-phosphorus-modified molecular sieve or only consisting of a phosphorus-modified molecular sieve. According to an electron probe microanalysis (EPMA), the D value of phosphorus in the catalytic cracking agent is ≥65%, preferably ≥68%, provided that the active component consists of the phosphorus-modified molecular sieve and the non-phosphorus-modified molecular sieve, or the D value of phosphorus in the catalytic cracking agent is ≥82%, preferably ≥84%, provided that the active component only consists of the phosphorus-modified molecular sieve.