Hydrocracking Catalyst Zeolite Beta ZSM-5 BTX Yield
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Solution Overview
Problem
Existing hydrocracking catalysts fail to maximize the yield of high-value C6-C9 light aromatic hydrocarbons containing BTX and C9 aromatics from polycyclic aromatic hydrocarbons in oil refining and petrochemical byproducts due to excessive hydrogenation and cracking activities, leading to low BTX yield and increased production of LPG and naphtha.
Innovation Solution
A hydrocracking catalyst comprising a composite zeolite of zeolite beta and ZSM-5, supported with group VIII metals (such as Ni and Co) and group VIB metals (such as Mo and W) is developed, which controls hydrogenation and cracking activities to enhance the production of BTX and C9 aromatics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If general hydrocracking catalysts are used, then the hydrogenation activity is high, but the yield of light aromatic hydrocarbons containing BTX and C9 aromatics decreases and hydrogen consumption increases
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by incorporating specific zeolite types (ZSM-5 and beta zeolite) with controlled silicon-to-aluminum ratios, and by selecting specific metal combinations (Group VIII metals like Ni, Co and Group VIB metals like Mo, W). These parameter changes optimize the balance between hydrogenation and cracking activities to maximize BTX yield while minimizing hydrogen consumption.
Solution Approach 2:
The patent uses a composite catalyst system combining multiple zeolite types (ZSM-5 and beta zeolite) with different pore structures and acid properties, along with multiple metal components. This composite structure allows the catalyst to perform multiple functions: ZSM-5 provides shape-selective cracking to produce BTX, while beta zeolite provides additional cracking capacity, and the metal components provide controlled hydrogenation activity.
2Productivity
If the benzene ring of tetralin is hydrogenated to produce decalin, then the hydrogenation activity is increased, but the final yield of light aromatic hydrocarbons decreases and LPG and naphtha production increases
Solution Approach 1:
The patent applies local quality by creating different functional zones within the catalyst structure. The ZSM-5 zeolite with its specific pore structure provides shape-selective catalysis that favors the formation of BTX molecules, while the beta zeolite provides different catalytic properties. The metal components are distributed to provide localized hydrogenation activity. This spatial and functional differentiation allows the catalyst to promote desired reactions while suppressing unwanted hydrogenation of benzene rings.
3Productivity
If various C8-C11+ alkylbenzenes are produced in high yield, then the cracking activity is high, but the concentration of BTX and C9 aromatics in the final product decreases
Solution Approach 1:
The patent uses ZSM-5 zeolite as an intermediary that mediates the cracking reactions. Its specific pore structure and acid sites act as a selective mediator that facilitates the conversion of heavy alkylbenzenes into BTX molecules while preventing the formation of unwanted C8-C11+ alkylbenzenes. The shape-selective nature of ZSM-5 ensures that only molecules with specific sizes and shapes (BTX) can form and diffuse out, effectively mediating the product distribution.
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 significantly increases the yield of BTX and C9 aromatics, suppressing unwanted side reactions and reducing hydrogen consumption, thereby improving the economic viability of converting low-value byproducts into high-value light fuel oils.
Implementation Method 1
a hydrocracking catalyst for preparing a C6-C9 light aromatic hydrocarbon, which contains: (i) a composite zeolite of zeolite beta and zeolite ZSM-5; (ii) a group VIII metal; and (iii) a group VIB metal
Implementation Method 2
naphthalene may be converted into high-value light aromatic hydrocarbons containing BTX and C9 aromatics by selectively hydrogenating only one benzene ring of the two benzene rings of naphthalene by adding hydrogen in the presence of a catalyst, thereby converting into tetralin
Data Source
AI summary
The present disclosure relates to a hydrocracking catalyst for preparing a C6-C9 light aromatic hydrocarbons having an increased BTX content from a polycyclic aromatic hydrocarbon, a method for preparing the same and a method for preparing a C6-C9 light aromatic hydrocarbons having an increased BTX content by using the same. More specifically, an effect of obtaining a C6-C9 light aromatic hydrocarbons having an increased BTX content with a high yield from the byproducts of oil refining and petrochemical processes, which contain polycyclic aromatic hydrocarbons such as naphthalene, alkylnaphthalene, etc., can be achieved by using a catalyst in which one or more metal selected from group VIII and one or more metal selected from group VIB are supported on a composite zeolite support of zeolite beta and zeolite ZSM-5.