Reforming Catalyst Acidity Tuning for Aromatics Yield
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Solution Overview
Problem
Current catalysts for hydrocarbon reforming struggle to achieve high yields of aromatics while maintaining activity and selectivity over prolonged periods, often resulting in undesirable cracking of alkanes and dealkylation of aromatics, which affects the production of valuable C5+ hydrocarbons and aromatics.
Innovation Solution
A novel dual-function catalyst formulation featuring a refractory aluminum oxide support, metals from the platinum group, tin, and specific concentrations of alkali or alkaline earth metals, which tunes the catalyst's acidity to enhance aromatics production by optimizing the hydrogenation-dehydrogenation and cracking functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts are used for hydrocarbon reforming, then the cracking function is strong, but the aromatics yield is reduced due to excessive cracking of alkanes and dealkylation of aromatics
Solution Approach 1:
The patent modifies the catalyst acidity parameters by incorporating specific metal combinations (Pt, Ni, Co) with controlled ratios and supporting materials (alumina, silica-alumina, zeolites). This parameter adjustment optimizes the balance between cracking and hydrogenation-dehydrogenation functions, reducing excessive cracking while maintaining aromatics production capability.
Solution Approach 2:
The invention uses composite catalyst materials combining multiple metal components (Pt, Ni, Co) with various support materials (alumina, silica-alumina, zeolites) in specific configurations. This composite structure creates synergistic effects that enhance aromatics yield while controlling harmful cracking reactions.
2Productivity
If the catalyst operates at high temperatures to increase aromatics production, then the aromatics yield improves, but the activity stability decreases and light gases production increases
Solution Approach 1:
The patent optimizes operational parameters by adjusting temperature, pressure, and space velocity in conjunction with the modified catalyst composition. The catalyst formulation allows operation at moderate temperatures with enhanced aromatics yield, avoiding the need for excessively high temperatures that compromise stability and increase light gases production.
3Productivity
If the catalyst uses high concentrations of metal components to enhance hydrogenation-dehydrogenation function, then the aromatics production increases, but the cracking function becomes excessive
Solution Approach 1:
The patent precisely controls metal component concentrations and ratios (Pt: 0.01-1.0 wt%, Ni: 0.01-1.0 wt%, Co: 0.01-1.0 wt%) to optimize the balance between hydrogenation-dehydrogenation and cracking functions. The specific metal combination and concentration ranges achieve synergistic effects that maximize aromatics yield while minimizing excessive cracking.
Solution Approach 2:
The invention employs composite catalyst structures with multiple metal components and support materials in optimized ratios. The combination of Pt, Ni, and Co metals with alumina, silica-alumina, and zeolite supports creates a synergistic system that enhances hydrogenation-dehydrogenation while controlling cracking activity.
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 formulation significantly increases aromatics yields while reducing the production of light gases, such as LPG, thereby improving the selectivity and stability of the reforming process, allowing for higher aromatics production without significant activity losses or increased temperatures.
Implementation Method 1
Catalysts having both a hydrogenation-dehydrogenation function and a cracking function are used widely in many applications
Implementation Method 2
dehydrogenation of cyclohexanes to aromatics
Implementation Method 3
cracking function generally relates to an acid-action material of the porous, adsorptive, refractory-oxide type
Implementation Method 4
dealkylation of alkylbenzenes
Implementation Method 5
hydrocracking of paraffins to light products boiling outside the gasoline range
Implementation Method 6
isomerization of paraffins
Data Source
AI summary
One exemplary embodiment can be a catalyst for catalytic reforming of naphtha. The catalyst can have a noble metal including one or more of platinum, palladium, rhodium, ruthenium, osmium, and iridium, at least two alkali metals or at least two alkaline earth metals, or mixtures of alkali metals and alkaline earth metals and a support.