Selective FCC Gasoline Hydrodesulfurization Catalyst
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Solution Overview
Problem
Current hydrotreatment processes for gasoline desulfurization face challenges in maintaining low sulfur content while minimizing the hydrogenation of olefins, leading to a significant drop in octane number due to non-selective catalysts.
Innovation Solution
A hydrotreatment catalyst comprising metals from group VIB and group VIII, supported on an alumina with a high gamma alumina content and specific surface area, optimized through heat treatment and impregnation processes to enhance selectivity and activity in hydrodesulfurization without severe reduction in octane number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrotreatment catalysts are used to achieve deep hydrodesulfurization, then sulfur content is reduced, but octane number drops significantly due to non-selective olefin hydrogenation
Solution Approach 1:
The patent changes the physical and chemical parameters of the alumina support, specifically controlling the gamma alumina content (60-95 wt%) and specific surface area (60-100 m2/g), to optimize the catalyst's selectivity. This allows deep hydrodesulfurization while preserving olefins and maintaining high octane numbers
Solution Approach 2:
The patent creates a composite catalyst system combining Group VIB metals (Mo, W) with Group VIII metals (Co, Ni) on a specially formulated alumina support. This composite structure synergistically enhances both hydrodesulfurization activity and selectivity, resolving the contradiction between sulfur removal and octane preservation
2Reliability
If catalyst selectivity is increased to preserve olefins and maintain octane number, then hydrodesulfurization activity may be reduced
Solution Approach 1:
The patent optimizes metal loading parameters (Group VIB: 3-35 wt%, Group VIII: 0.1-10 wt%) and support properties (gamma alumina content, specific surface area) to achieve a balance where the catalyst maintains high hydrodesulfurization activity while being selective enough to preserve olefins and maintain octane number
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 deep hydrodesulfurization with improved selectivity, maintaining high octane numbers by effectively reducing sulfur content while limiting olefin hydrogenation, thus producing gasoline that meets stringent sulfur specifications.
Implementation Method 1
heat treatment of an alumina precursor so as to obtain a support having a gamma alumina content of between 60% and 95% wt.
Implementation Method 2
at least one component of a metal of group VIB, at least one component of a metal of group VIII, and optionally phosphorus are brought into contact with said support
Implementation Method 3
A hydrotreatment catalyst comprising at least one metal from group VIB, at least one metal from group VIII and an alumina support
Data Source
Figure 1~2
AI summary
The present invention relates to a hydrotreating catalyst comprising at least one metal from group VIB, at least one metal from group VIII and an alumina support having a gamma alumina content greater than 50% by weight and less than 100% by weight relative to the weight of the support, said support having a specific surface area between 25 and 150 m2/g.