Hydrocracking Catalyst for Monoaromatic Hydrocarbon Production
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Solution Overview
Problem
Current processes face inefficiencies in converting C9+ hydrocarbons, such as dicyclopentadiene, into high-value monoaromatic hydrocarbons like BTX, often resulting in undesirable reactions and low selectivity due to the reactivity of dicyclopentadiene and stability of indene and naphthalene, which complicates achieving high conversion and selectivity.
Innovation Solution
A two-stage process involving a hydrocracking stage with a zeolite-supported catalyst containing molybdenum, tungsten, nickel, or platinum, followed by a selective ring opening stage with a silica-alumina ratio-adjusted zeolite catalyst, to convert dicyclopentadiene into monoaromatic hydrocarbons, optimizing conditions to maximize BTX yield and selectivity while minimizing unwanted products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrocracking catalysts are used to convert dicyclopentadiene to monoaromatic hydrocarbons, then conversion can occur, but selectivity is low and undesirable reactions occur
Solution Approach 1:
The catalyst is segmented into distinct functional components: a zeolite support providing shape-selective pores (5-13 nm diameter) and metal impregnation sites, with the metal component (3-15 wt% Mo, W, Ni, Co, Pt, or Pd) providing hydrocracking activity. This segmentation allows each component to perform its specific function optimally, achieving high selectivity for monoaromatic hydrocarbons while managing the complexity of the overall catalyst structure.
Solution Approach 2:
The invention uses a composite catalyst material combining a zeolite support with specific pore dimensions and metal impregnated on its surface. The zeolite provides structural integrity and shape selectivity, while the metal component provides catalytic activity for hydrocracking. This composite structure resolves the contradiction by integrating multiple functions into a single material system that achieves both conversion and high selectivity.
2Productivity
If reaction conditions are optimized for high conversion of dicyclopentadiene, then conversion exceeds 70%, but selectivity to BTX decreases
Solution Approach 1:
The invention optimizes specific parameters including metal loading (3-15 wt%), zeolite pore diameter (5-13 nm), metal particle size (1-5 nm), and reaction conditions (temperature, pressure, LHSV) to achieve the optimal balance between conversion and selectivity. By carefully controlling these parameters, the catalyst achieves over 70% conversion while maintaining high selectivity to BTX products.
Solution Approach 2:
The catalyst exhibits local quality through its heterogeneous structure: the zeolite pores provide a specific microenvironment with defined dimensions (5-13 nm) that selectively accommodate certain transition states, while the metal sites provide hydrocracking functionality. This local differentiation allows the catalyst to favor monoaromatic hydrocarbon formation even at high conversion levels.
3Manufacturing precision
If a single-stage process is used, then device complexity is reduced, but conversion and selectivity to monoaromatic hydrocarbons are insufficient
Solution Approach 1:
The invention merges the hydrocracking function and the shape-selective function into a single integrated catalyst system. The zeolite support and metal component work synergistically within one catalyst particle to achieve both high conversion and high selectivity in a single reaction stage, eliminating the need for multiple sequential processing steps.
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 approach significantly enhances the conversion and selectivity of dicyclopentadiene to monoaromatic hydrocarbons, achieving high yields and selectivity of BTX, with overall conversions exceeding 70% and BTX yields greater than 20%, while reducing undesirable byproducts like cycloalkanes and C1-4 hydrocarbons.
Implementation Method 1
contacting the feedstock with the hydrocracking catalyst in the presence of hydrogen to provide a reaction product stream including the monoaromatic hydrocarbons converted from the dicyclopentadiene
Implementation Method 2
contacting the feedstock with the hydrocracking catalyst in the presence of hydrogen
Data Source
AI summary
A process for converting a feedstock including dicyclopentadiene to monoaromatic hydrocarbons, the process including providing a hydrocracking catalyst including a zeolite support having an average pore diameter of 5 to 13 nanometers, such as 9 to 12 nanometers, and greater than 3 to 15 weight percent, such as 5 to 15 weight percent of molybdenum tungsten, nickel, cobalt, platinum, palladium, or a combination comprising at least one of the foregoing impregnated on the zeolite support based on a total weight of the hydrocracking catalyst: and contacting the feedstock with the hydrocracking catalyst in the presence of hydrogen to provide a reaction product stream including the monoaromatic hydrocarbons converted from the dicyclopentadiene.