Pt-Based Alloy MOFs Catalyst for Selective Hydrogenation
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Solution Overview
Problem
Existing selective hydrogenation catalysts face challenges such as complex preparation methods, severe reaction conditions, and poor cycle stability due to nanoparticle agglomeration and lack of interaction between metal or alloy and carrier, limiting their scalability and efficiency.
Innovation Solution
A one-step solvothermal method using terephthalic acid to promote the co-reduction of platinum acetylacetonate and acetylacetone metal salt, resulting in a Pt-based alloy uniformly distributed on MOFs carriers like UiO-66-NH2, enhancing catalytic activity and stability by improving particle dispersion and interaction with the carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Pt-based nanoparticles are loaded on carrier through mechanical stirring, then catalytic activity and hydrogenation selectivity are improved, but nanoparticles are easy to fall off, agglomerate or deform during catalytic process, resulting in poor cycle stability
Solution Approach 1:
The patent uses acetylacetone ligands as intermediaries to bridge Pt nanoparticles and MOF carriers. The ligands form a coordination structure where Pt atoms are bound to both the ligand and the carrier, creating a stable intermediary layer that prevents direct contact between metal particles and carrier while ensuring strong interaction. This resolves the contradiction by maintaining catalytic activity through Pt exposure while preventing agglomeration and deformation through the stabilizing ligand layer.
Solution Approach 2:
The patent creates a composite material system consisting of Pt nanoparticles, acetylacetone ligands, and MOF carriers forming a Pt-Ligand-MOF composite structure. This composite approach allows the Pt particles to be stabilized on the carrier surface through the ligand framework, preventing fall-off and agglomeration while maintaining catalytic functionality. The composite structure provides both the catalytic activity of Pt and the stability of the MOF carrier.
2Reliability
If multiple synthesis steps are used to prepare selective hydrogenation catalysts, then catalytic performance can be optimized, but preparation methods become complex and severe reaction conditions are required
Solution Approach 1:
The patent merges the synthesis of Pt nanoparticles and MOF carrier into a single one-pot reaction process. Both components are formed simultaneously in the same reaction vessel using acetylacetone ligands as building blocks, eliminating the need for separate synthesis steps and subsequent loading procedures. This merging reduces preparation complexity while maintaining optimized catalytic performance through the integrated structure.
Solution Approach 2:
The patent performs preliminary formation of the Pt-Ligand-MOF composite structure during the synthesis process itself, rather than assembling components separately afterward. The acetylacetone ligands are incorporated into the MOF structure and coordinated with Pt atoms in advance, creating a pre-assembled catalytic system that requires only simple post-synthesis processing. This preliminary action simplifies the overall preparation method while ensuring optimal catalyst structure.
3Manufacturing precision
If Pt-based alloys with Fe and Co are used, then hydrogenation selectivity for C═O double bonds is improved, but nanoparticles are prone to agglomeration during synthesis or reaction, resulting in gradual decrease in catalytic performance
Solution Approach 1:
The patent uses acetylacetone ligands as intermediary stabilizers for PtFe alloy nanoparticles. The ligands coordinate with both Pt and Fe atoms, forming a protective shell around the alloy particles during synthesis and reaction. This intermediary layer prevents direct aggregation of metal particles while maintaining the alloy composition necessary for high C═O hydrogenation selectivity. The ligand-mediated stabilization ensures long-term catalytic performance stability.
Solution Approach 2:
The patent controls the particle size and composition parameters of PtFe alloys through the acetylacetone ligand system. By adjusting the ligand-to-metal ratio and reaction conditions, the patent optimizes the alloy composition and particle dimensions to achieve high selectivity while preventing agglomeration. The ligand framework provides a controlled environment that maintains precise parameter control throughout the catalytic process, preventing performance degradation.
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 method enables high selectivity and stability for hydrogenation of α, β-unsaturated aldehydes and 3-nitrostyrene under mild conditions, with PtFe2/UiO-66-NH2 catalyst achieving 98.9% conversion and 95.4% cinnamyl alcohol selectivity, maintaining performance after multiple cycles, and demonstrating excellent hydrogen storage capacity.
Implementation Method 1
using the organic ligand terephthalic acid (BDC) to promote the co-reduction of platinum acetylacetonate and acetylacetonate metal salt
Implementation Method 2
selective hydrogenation of α, β-unsaturated aldehydes to obtain a single product
Implementation Method 3
Pt-based precious metals and the alloys thereof are often used for selective catalytic hydrogenation
Implementation Method 4
the selective formation of 3-aminostyrene from 3-nitrostyrene
Implementation Method 5
Pt-based precious metals and the alloys thereof are often used for selective catalytic hydrogenation
Implementation Method 6
the catalyst also exhibits excellent catalytic dehydrogenation capacity and atmospheric hydrogen storage capacity
Data Source
AI summary
The present disclosure relates to the technical field of molecular biology, and in particular to a method for preparing a Pt-based alloy/MOFs catalyst with high hydrogenation selectivity, and a preparation method thereof. The present disclosure prepares a Pt-based alloy/MOFs structure with Pt alloy particles uniformly supported on the surface of MOFs in one step through a simple solvothermal method, the preparation method of the present disclosure is simple, the reaction environment is not harsh and does not require a special atmosphere. The resulting product has a unique structure, with small metal particles, uniform distribution and not easy to lose, and it will not affect the catalytic activity of the metal. In terms of catalytic performance, the obtained Pt alloy/MOFs catalyst can catalytically hydrogenate cinnamaldehyde under normal temperature and pressure, and has excellent performance. In addition, the catalyst can also catalyze the selective hydrogenation of 3-nitrostyrene, catalyze the dehydrogenation of tetrahydroquinoline, which proves that the catalyst of the present disclosure has a wide range of applications.