C5 Conversion Catalyst Using Constrained Aluminosilicate
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Solution Overview
Problem
Current processes fail to efficiently convert acyclic C5 feedstocks into cyclic C5 compounds like cyclopentadiene with high yield and selectivity, while minimizing the production of light C4 byproducts and maintaining catalyst stability.
Innovation Solution
A process using a catalyst composition comprising a microporous crystalline aluminosilicate with a constraint index of less than or equal to 5, combined with a Group 10 metal such as platinum, and optionally a Group 11 metal like copper, in the presence of a Group 1 alkali metal and/or a Group 2 alkaline earth metal, under specific temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dehydrogenation catalysts (Pt/Sn/alumina, Pt/Sn/aluminate) are used to convert acyclic C5 feedstock, then dehydrogenation activity is achieved, but cyclic C5 product selectivity and yield are poor
Solution Approach 1:
The patent changes the catalyst support parameter from conventional alumina/aluminate to a specific microporous crystalline aluminosilicate with constraint index ≤5, and adjusts the metal composition to Group 10 combined with Group 11 metals. This parameter change transforms the catalyst's ability to achieve both high conversion and high selectivity to cyclic C5 compounds, resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent employs composite catalyst materials combining Group 10 metals (Pt, Pd, Ni) with Group 11 metals (Cu, Ag, Au) supported on microporous crystalline aluminosilicate. This composite structure synergistically enhances both dehydrogenation activity and cyclization selectivity, achieving high cyclic C5 yield and selectivity simultaneously.
2Productivity
If Pt on chlorided alumina catalysts are used for dehydrogenation and cyclization, then C6+ aromatic ring formation is effective, but cyclic C5 yield is low and catalyst deactivates rapidly
Solution Approach 1:
The patent changes the support material parameter to microporous crystalline aluminosilicate with specific constraint index ≤5, which provides stable acid sites and prevents rapid catalyst deactivation. This parameter change maintains high cyclic C5 production while extending catalyst lifetime, resolving the contradiction between initial productivity and duration of action.
Solution Approach 2:
The patent avoids using chlorided alumina catalysts that deactivate rapidly (short-lived), instead employing stable aluminosilicate-supported catalysts that maintain activity over extended periods, effectively replacing short-lived catalysts with long-lived alternatives.
3Productivity
If conventional catalysts are used to maximize conversion, then light C4 byproduct formation increases
Solution Approach 1:
The patent changes the catalyst composition parameters (Group 10 + Group 11 metals on constrained aluminosilicate) to achieve selective cyclization that favors cyclic C5 formation over C4 cracking. This parameter change enables high C5 conversion while minimizing C4 byproduct loss, resolving the contradiction between productivity and substance conservation.
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
Achieves a conversion of at least 20% of acyclic C5 feedstock to cyclic C5 compounds with high carbon selectivity to cyclopentadiene, reducing unwanted byproduct formation and maintaining catalyst activity over time.
Implementation Method 1
contacting said feedstock and, optionally, hydrogen under acyclic C5 conversion conditions in the presence of a catalyst composition to form said product
Data Source
AI summary
Disclosed is a process for the conversion of acyclic C5 feedstock to a product comprising cyclic C5 compounds, such as for example, cyclopentadiene, and catalyst compositions for use in such process. The process comprising the steps of contacting said feedstock and, optionally, hydrogen under acyclic C5 conversion conditions in the presence of a catalyst composition to form said product. The catalyst composition comprising a crystalline aluminosilicate having a constraint index of less than or equal to 5, and a Group 10 metal, and, optionally, a Group 11 metal, in combination with a Group 1 alkali metal and/or a Group 2 alkaline earth metal.