Platinum Molecular Sieve Catalyst Hydroisomerization
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Solution Overview
Problem
Existing methods for improving cold flow properties of hydrocarbon mixtures, such as diesel fuel, often result in yield loss and high hydrogen consumption due to side reactions during hydroisomerization, and traditional dewaxing methods are costly and inefficient.
Innovation Solution
A catalytically active material comprising platinum dispersed on a molecular sieve with a metal oxide support, where at least 80% of the platinum is in clusters smaller than 1 nm, and optionally including carbon and organic additives, is used for hydroisomerization, allowing for improved impregnation and selective deposition of platinum on the molecular sieve, enhancing dewaxing activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalytic hydroisomerization is used to improve cold flow properties, then yield and hydrogen consumption are improved compared to hydrocracking, but side reactions still occur causing yield loss and hydrogen consumption
Solution Approach 1:
The patent applies local quality by creating platinum clusters with specific size distributions (at least 80% with diameter ≤1 nm) dispersed on specific molecular sieve sites. This localized control of platinum cluster size and position enhances hydroisomerization selectivity while suppressing hydrocracking side reactions, thereby improving yield and reducing yield loss simultaneously
Solution Approach 2:
The patent changes physical parameters by controlling platinum cluster size (diameter ≤1 nm) and dispersion density on the molecular sieve. These parameter changes optimize the catalytic activity for hydroisomerization while minimizing hydrocracking reactions, resolving the contradiction between productivity and substance loss
2Reliability
If conventional catalysts are used for hydroisomerization, then dewaxing activity is achieved, but selectivity is low leading to excessive hydrogen consumption
Solution Approach 1:
The patent uses local quality by dispersing platinum specifically on molecular sieve sites with controlled cluster sizes (≤1 nm). This localized deposition ensures high dewaxing activity through effective platinum-molecular sieve interaction while suppressing non-selective hydrocracking reactions that consume excessive hydrogen
Solution Approach 2:
The patent employs composite materials by combining platinum clusters with specific molecular sieves (such as ZSM-5, beta, or Y-type zeolites) and metal oxide supports. This composite structure synergistically enhances dewaxing activity while improving selectivity to reduce hydrogen consumption
3Reliability
If platinum is dispersed on molecular sieve for hydroisomerization, then catalytic activity is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing molecular sieves with specific pore structures and active sites before depositing platinum clusters. This preliminary preparation of the support structure facilitates controlled platinum dispersion and cluster formation, enhancing catalytic activity while managing manufacturing complexity through a structured multi-step process
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 catalytically active material demonstrates increased dewaxing activity and selectivity, reducing hydrogen consumption and yield loss, while maintaining high activity and thermal stability, thereby improving cold flow properties with enhanced efficiency.
Implementation Method 1
A catalytically active material comprising platinum dispersed on a molecular sieve with a metal oxide support, where at least 80% of the platinum is in clusters smaller than 1 nm
Implementation Method 2
allowing for improved impregnation and selective deposition of platinum on the molecular sieve
Implementation Method 3
a molecular sieve having a topology such as AEI, AEL, AFO, AFX, ATO, BEA, CHA, FAU, FER, MEL, MFI, MOR, MRE, MTT, MWW or TON
Implementation Method 4
The process requires the presence of hydrogen
Data Source
AI summary
The present disclosure relates to a precursor for a catalytically active material or a catalytically active material comprising platinum, a molecular sieve and a metal oxide support, characterized in at least 80%, 90% or 95% of said platinum being dispersed on said molecular sieve and at least 80%, 90% or 95% of said platinum being dispersed in clusters having a size below 2 nm or 1 nm, as well as a method of producing such materials and process for hydroisomerization involving such materials. The disclosure has the associated benefit of such a catalytically active material being highly active and selective towards hydroisomerization.