Sulfurized Hydrogenation Catalyst for Selective Polycyclic Ring Opening
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Solution Overview
Problem
Existing hydrogenation catalysts are expensive due to high molecular sieve and noble metal content, and their performance and utilization rate are not optimized for efficient polycyclic aromatic hydrocarbon saturation and ring opening without chain scission.
Innovation Solution
A sulfurized hydrogenation catalyst with a molecular sieve content of 60-100% directly acting on group VIB metal sulfide, combined with group VIII and VIB metal sulfides, is prepared by impregnation, sulfurization, and molecular sieve loading, reducing the need for high molecular sieve content and optimizing active metal utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high content of molecular sieve and noble metal is used in the catalyst, then the catalyst activity and selectivity are improved, but the catalyst cost increases excessively
Solution Approach 1:
The patent replaces expensive noble metals (Pt, Pd, Ir) with cheaper base metals (Ni, Co, Cu, Zn, Mn, Fe) as active components. The catalyst uses base metal sulfides or oxides instead of noble metals, achieving comparable catalytic activity at significantly lower cost. This directly addresses the cost issue while maintaining catalyst performance through the use of abundant, inexpensive metallic elements.
Solution Approach 2:
The patent optimizes the molecular sieve content from high concentrations (where most molecular sieve does not play a role) to a specific range of 5-20 wt%. This parameter change ensures sufficient catalytic activity while eliminating the waste of expensive molecular sieve material. The optimized content range maintains the necessary pore structure and acidity for polycyclic aromatic hydrocarbon conversion without excessive molecular sieve that fails to contribute to performance.
2Stability of the object's composition
If high content of molecular sieve carrier is used, then the catalyst structure is stabilized, but the utilization rate of molecular sieve decreases as most does not play a role
Solution Approach 1:
The patent changes the molecular sieve content parameter from high concentrations to an optimized range of 5-20 wt%. This parameter optimization ensures that the molecular sieve content is sufficient to provide structural stability and necessary catalytic functions (acidity and pore structure) while avoiding the waste of excessive molecular sieve that does not contribute to performance. The optimized range maximizes the utilization rate of molecular sieve material.
Solution Approach 2:
The patent creates a balanced catalyst composition where molecular sieve, metal active components, and carrier each play specific localized roles. The molecular sieve provides acidity and pore structure in specific regions, while the carrier provides mechanical strength and stability. This local quality differentiation ensures that each component contributes effectively to the overall catalytic performance, maximizing the utility of expensive molecular sieve material.
3Reliability
If traditional two-stage hydro-upgrading process is used, then the polycyclic aromatic hydrocarbon saturation is achieved, but the process complexity and production cost increase
Solution Approach 1:
The patent develops a single-stage hydrogenation catalyst that performs multiple functions: it simultaneously saturates polycyclic aromatic hydrocarbons, controls ring opening, and prevents excessive chain scission. This multi-functional catalyst replaces the need for two separate catalysts and two reaction stages, simplifying the overall process while achieving the same or better conversion results. The single catalyst system integrates the functions previously requiring sequential two-stage processing.
Solution Approach 2:
The patent merges the functions of two separate catalysts (first-stage and second-stage catalysts) into a single integrated catalyst formulation. The catalyst combines base metal active components with molecular sieve and carrier to achieve both aromatic saturation and controlled ring opening in one reaction zone. This merging eliminates the complexity of two-stage processing, reduces equipment requirements, and lowers operational costs while maintaining product quality.
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 achieves high activity and selectivity for polycyclic aromatic hydrocarbon saturation, producing monocyclic aromatic hydrocarbons suitable for ethylene cracking and high-quality diesel, while reducing catalyst costs and improving molecular sieve and metal utilization.
Implementation Method 1
hydrogenation saturation of the polycyclic aromatic hydrocarbon, so as to generate a monocyclic aromatic hydrocarbon
Implementation Method 2
A sulfurized hydrogenation catalyst with a molecular sieve content of 60-100% directly acting on group VIB metal sulfide
Implementation Method 3
The prepared carrier is then loaded with a molecular sieve
Data Source
AI summary
A hydrogenation catalyst and a preparation method therefor and the use thereof, and a hydrogenation reaction method for oil products are presented. The hydrogenation catalyst is a sulfurized hydrogenation catalyst and comprises a carrier, a molecular sieve and an active component, wherein the active component comprises at least one of group VIII metal elements and at least one of group VIB metal elements, and is characterized by using a TEM-EDS method. On the basis of the silicon element, the ratio of the amount of the molecular sieve directly acting on a group VIB metal sulfide to the total amount of the molecular sieve is 60-100%. The hydrogenation catalyst provided in the present invention can control a polycyclic aromatic hydrocarbon to realize ring opening without chain scission, generating a monocyclic aromatic hydrocarbon with a long-branched chain, which can be used as both an ethylene cracking raw material and a diesel product.