MCM-41 Catalyst for Aromatics Hydrogenation
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Solution Overview
Problem
Current hydrofinishing technologies face challenges in achieving effective aromatics hydrogenation and saturation of hydrocarbon feeds, particularly with noble metal catalysts being sensitive to sulfur and requiring high temperatures, which compromises color quality and oxidation stability.
Innovation Solution
A catalyst system utilizing an inorganic, porous, non-layered crystalline phase material with a hexagonal arrangement of uniformly-sized pores, composed of SiO2 and a Group IV metal like titanium or zirconium, supported by an MCM-41 framework, combined with Group VIII noble metals, operates under specific conditions to enhance aromatics hydrogenation and saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metal catalysts are used for aromatics hydrogenation, then superior color stability and oxidation stability are achieved, but the catalyst is poisoned by sulfur and can only process feeds with very low sulfur levels
Solution Approach 1:
The patent introduces a bifunctional catalyst system where base metal oxide (e.g., ZnO, CuO, NiO) acts as an intermediary that removes sulfur from the feedstock before the noble metal component processes aromatics. This mediator protects the noble metal from sulfur poisoning while maintaining its hydrogenation activity.
Solution Approach 2:
The invention uses a composite catalyst combining base metal oxides with noble metals on a mesoporous support. This composite structure allows the base metal oxide to handle sulfur removal while the noble metal performs aromatic hydrogenation, resolving the contradiction between sulfur sensitivity and catalytic performance.
2Reliability
If higher processing temperatures are used to achieve sufficient oxidation stability, then oxidation stability is improved, but color quality is sacrificed
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by incorporating base metal oxides with specific properties that enable effective sulfur removal at lower temperatures. This allows the process to achieve oxidation stability without the high temperatures that would compromise color quality.
3Object-affected harmful factors
If base metal catalysts are used instead of noble metal catalysts, then sulfur resistance is improved, but larger reactor volumes and higher pressures are required to achieve the same performance
Solution Approach 1:
The invention merges the sulfur resistance of base metal catalysts with the high activity of noble metal catalysts in a single bifunctional catalyst system. The base metal oxide component provides sulfur resistance while the noble metal component provides high hydrogenation activity, eliminating the need for larger reactor volumes.
4Illumination intensity
If noble metal catalysts are used to achieve almost complete removal of aromatics, then superior color stability is achieved, but the catalyst requires very low sulfur levels in the feed
Solution Approach 1:
The patent segments the catalytic function into two distinct components: base metal oxide for sulfur removal and noble metal for aromatic hydrogenation. This segmentation allows each component to perform its specialized function optimally, with the noble metal achieving superior color stability without being poisoned by sulfur.
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
This catalyst system effectively hydrogenates aromatics, maintains color quality, and withstands sulfur contamination without increasing acidity, achieving superior aromatics saturation at lower temperatures and pressures compared to traditional systems.
Implementation Method 1
The support material for the at least one Group VIII noble metal can include MCM-41 mesoporous support materials
Implementation Method 2
The hydrogenation catalyst includes an inorganic porous crystalline phase material... and at least one hydrogenation-dehydrogenation component selected from the Group VIII noble metals
Implementation Method 3
a hexagonal arrangement of uniformly-sized pores having diameter of at least about 15 Angstroms
Data Source
AI summary
An MCM-41 catalyst having a crystalline framework containing SiO2 and a Group IV metal oxide, such as TiO2 or ZrO2 is provided. The catalyst is low in acidity and is suitable for use in processes involving aromatic saturation of hydrocarbon feedstocks.