Hydrotreatment Catalyst Composite Materials for Sulfur Removal
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Solution Overview
Problem
Current hydrotreatment catalysts face challenges in meeting stringent sulfur content and aromatic compound reduction standards due to increasingly heavy crude feeds and refractory nature of petroleum products, requiring improved hydrodesulfurization and hydrodenitrogenation capabilities.
Innovation Solution
A catalyst comprising an alumina-based amorphous support, phosphorus, C1-C4 dialkyl succinate, acetic acid, and a hydro-dehydrogenizing function with group VIII and VIB elements, characterized by specific Raman bands, is prepared through a method involving impregnation and maturation stages without calcination, enhancing catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrotreatment catalysts are used, then basic hydrodesulfurization function is provided, but catalytic activity is insufficient for stringent sulfur content standards
Solution Approach 1:
The patent applies composite materials by combining group VIII metals (Ni, Co) with group VIB metals (Mo, W) on an alumina support to create a synergistic catalyst system. This composite structure provides both the necessary hydrodesulfurization reliability and enhanced catalytic activity, as the interaction between different metal groups creates active sites with improved performance for breaking C-S bonds in refractory compounds.
Solution Approach 2:
The patent employs parameter changes by optimizing the oxidation state and surface composition of the catalyst through controlled preparation methods. By adjusting metal loading, support surface area, and oxidation conditions, the catalyst achieves maximum catalytic activity while maintaining stable hydrodesulfurization performance, resolving the contradiction between activity and reliability.
2Productivity
If catalysts are designed for high catalytic activity, then conversion efficiency increases, but stability and reliability under operating conditions decrease
Solution Approach 1:
The patent applies local quality by creating specific active sites with optimized metal distributions on the alumina support surface. The group VIII and VIB metals are positioned to create localized regions of high catalytic activity while the overall catalyst structure maintains stability. This spatial arrangement ensures that conversion efficiency is enhanced at active sites without compromising overall catalyst reliability.
Solution Approach 2:
The patent employs preliminary action by pre-treating the catalyst with controlled oxidation to establish a stable surface composition before operation. This preliminary oxidation step creates a robust catalyst structure that maintains stability during operation while preserving high catalytic activity, preventing degradation that would otherwise occur under operating conditions.
3Stability of the object's composition
If traditional catalyst preparation methods with calcination are used, then catalyst structure is stabilized, but catalytic activity is reduced
Solution Approach 1:
The patent applies preliminary action by performing controlled oxidation of the catalyst precursor before final activation. This preliminary oxidation step stabilizes the catalyst structure by forming appropriate metal oxides and surface compounds, while avoiding excessive calcination that would reduce catalytic activity. The oxidation is carefully controlled to achieve the right balance between structural stability and activity.
Solution Approach 2:
The patent employs parameter changes by optimizing the oxidation temperature, time, and atmosphere to achieve maximum catalytic activity while maintaining structural stability. By adjusting these parameters, the catalyst avoids the deactivating effects of traditional high-temperature calcination while still achieving a stable, active structure suitable for high-performance hydrodesulfurization.
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 exhibits significantly improved hydrodesulfurization and hydrodenitrogenation performance, allowing for lower operating temperatures and increased productivity, meeting stringent fuel specifications and industrial scalability requirements.
Implementation Method 1
the purpose of a hydrocarbon cut hydrotreatment catalyst is to eliminate the sulfur or nitrogen compounds contained in such cuts
Implementation Method 2
the goal can also be to pre-treat this feed so as to eliminate the impurities it contains prior to subjecting it to various conversion processes
Implementation Method 3
Catalyst that can be used in hydrotreatment, comprising metals of groups VIII and VIB
Data Source
AI summary
A catalyst usable in hydrotreatment processes: an alumina-based amorphous support, phosphorus, a C1-C4 dialkyl succinate, acetic acid and a hydro-dehydrogenizing function of at least one group VIII element and at least one group VIB element, preferably made up of cobalt and molybdenum, a catalyst whose Raman spectrum comprises the most intense bands characteristic of the Keggin heteropolyanions (974 and/or 990 cm−1), C1-C4 dialkyl succinate and acetic acid (896 cm−1). Preferably, the dialkyl succinate concerned is dimethyl succinate and its main band is at 853 cm−1.