Selective Hydrogenation Catalyst with Flexible Ligand
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Solution Overview
Problem
The existing selective hydrogenation catalysts for alkynols suffer from low selectivity and stability, making them unsuitable for continuous hydrogenation reactions, leading to reduced conversion rates and inconsistent product quality.
Innovation Solution
A selective hydrogenation catalyst is developed with transition metal particles supported by a modified carrier, where a flexible chain ligand is used to uniformly distribute on the carrier's surface and coordinate with the transition metal, improving dispersion and catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Lindlar catalyst is used for selective hydrogenation of dehydrolinalool, then the over-hydrogenation reaction is suppressed and selectivity is improved, but the catalyst activity is limited and the process complexity increases due to toxic additives
Solution Approach 1:
The patent changes the chemical parameters of the catalyst by replacing toxic lead and bismuth additives with organic ligands containing nitrogen, oxygen, or sulfur atoms. This parameter change maintains the selective hydrogenation capability while improving catalyst activity and eliminating toxicity issues
Solution Approach 2:
The patent creates a composite catalyst system consisting of transition metal particles (Pd, Pt, Rh, Ir, Ru) combined with organic ligands (amines, carboxylic acids, alcohols, thiols) supported on carrier materials. This composite structure integrates the advantages of metal catalytic activity with the selectivity control provided by organic ligands, achieving both high activity and selectivity
2Manufacturing precision
If Lindlar catalyst with toxic additives is used, then selectivity is improved, but environmental safety and operational safety deteriorate due to toxic Pb and auxiliary agents
Solution Approach 1:
The patent extracts and removes the toxic lead and bismuth additives from the catalyst system, replacing them with environmentally benign organic ligands. This extraction eliminates the harmful factors while preserving the selective hydrogenation function through alternative molecular mechanisms
Solution Approach 2:
The patent employs organic ligands that are less toxic and more environmentally friendly than heavy metal additives. These ligands can be organic compounds that are easier to handle and dispose of safely, reducing environmental and operational hazards
3Manufacturing precision
If auxiliary agents such as quinoline are introduced to improve selectivity, then over-hydrogenation is inhibited, but the complexity of separation and purification process increases
Solution Approach 1:
The patent extracts and eliminates the need for auxiliary agents like quinoline by incorporating the selectivity-controlling function directly into the catalyst structure through organic ligands. This removes the source of contamination that would complicate downstream separation and purification processes
4Productivity
If transition metal nanocatalysts modified by organic ligands are used, then catalytic performance is improved, but stability deteriorates and molecular mechanism remains unclear
Solution Approach 1:
The patent applies local quality by creating specific coordination environments around transition metal particles through organic ligands. The ligands provide localized electronic and steric effects that stabilize the metal particles and control their catalytic behavior, improving both performance and stability simultaneously
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 high conversion rates and selectivity in continuous hydrogenation processes, enhancing product quality and stability, while allowing for safer and more efficient operation in multi-kettles-in-series mode.
Implementation Method 1
a flexible chain ligand is used to uniformly distribute on the carrier's surface and coordinate with the transition metal
Implementation Method 2
a flexible chain ligand is used to uniformly distribute on the carrier's surface
Implementation Method 3
catalyst achieves high conversion rates and selectivity in continuous hydrogenation processes
Data Source
AI summary
The present invention discloses a selective hydrogenation catalyst and a preparation method and an application thereof, belonging to the technical field of catalysts. The selective hydrogenation catalyst comprises an active component and a carrier for supporting the active component, wherein the active component is a transition metal particle, the carrier is modified by a flexible chain ligand in advance, one end of the flexible chain ligand is uniformly distributed on the surface of the carrier, and the other end of the flexible chain ligand is coordinated on a transition metal. When the catalyst is used for catalytic hydrogenation reaction of dehydrolinalool or 2-methyl-3-butyn-2-ol, the stability is good, the catalyst still has high selectivity after being used for a long time, and the quality of a hydrogenation product can be guaranteed.