Modified Zeolite Beta Catalyst Stability
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Solution Overview
Problem
Zeolite beta's structure is prone to injury during template removal and exhibits poor activity stability due to dealuminization in reaction processes, limiting its effectiveness in catalytic applications.
Innovation Solution
Modification of zeolite beta with phosphorus and transition metals, specifically through ammonium exchange, phosphorus introduction, and calcination, to enhance hydrothermal stability and selectivity of C2˜C12 olefins as a cracking catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zeolite beta is used as a catalytic material, then it shows excellent catalytic activity and selectivity, but its structure is easy to be injured during template removal and it exhibits poor activity stability due to dealuminization
Solution Approach 1:
The patent applies preliminary action by introducing phosphorus and transition metals into the zeolite beta framework before catalytic reactions occur. This pre-modification protects the structure from dealuminization during template removal and subsequent reactions, preventing structural injury and maintaining activity stability throughout the catalytic process
Solution Approach 2:
The patent creates a composite material by combining phosphorus, transition metals (such as Fe, Co, Ni, Cu, Mn, Zn, or Sn), and zeolite beta. This composite structure enhances the hydrothermal stability and resistance to dealuminization, resolving the contradiction between catalytic activity and structural stability
2Reliability
If zeolite beta is modified with phosphorus and transition metals, then hydrothermal stability and selectivity are improved, but the catalyst preparation process becomes more complex
Solution Approach 1:
The patent merges multiple modification steps into an integrated preparation process where phosphorus and transition metals are introduced together through impregnation followed by calcination. This combined approach achieves dual functionality (hydrothermal stability and catalytic selectivity) while streamlining the preparation process compared to separate modification steps
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 modified zeolite beta demonstrates increased hydrothermal stability and selectivity of C2˜C12 olefins, particularly C5˜C12 olefins, improving catalytic cracking performance and yield.
Implementation Method 1
the catalyst consists of 10-90 wt % of zeolite beta, 5-90 wt % of a binder and 0.05-5 wt % of metals selected from the group consisting of Ni, Co, Cu, Ag, Sn, Ga and the like, wherein the metals are supported by means of immersion
Implementation Method 2
These metals are supported in pores of the zeolite by impregnating
Data Source
AI summary
A modified zeolite beta having an anhydrous chemical formula, by weight % of the oxides, of (0-0.3)Na2O.(0.5-10)Al2O3.(1.3-10)P2O5.(0.7-15)MxOy.(70-97)SiO2, wherein M is one or more transition metal(s) selected from the group consisting of Fe, Co, Ni, Cu, Mn, Zn and Sn, x is the number of the atoms of said transition metal M, and y is a number that meets with the requirement of the oxidation state of said transition metal M, is disclosed. The modified zeolite beta can be used as an active component of a cracking catalyst or additive for catalytic cracking of petroleum hydrocarbons.