Hydrogenation Catalyst Sulfide Layering for Class II Active Centers

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Solution Overview

Problem

Existing hydrogenation catalysts face challenges in efficiently generating Class II active centers, leading to decreased catalyst activity due to the wrapping effect of metal Group VIB sulfides around metal Group VIII sulfides during sulfurization.

Innovation Solution

A novel hydrogenation catalyst is developed by impregnating and sulfurizing different active metals step-by-step, where metal Group VIB is first impregnated on the support, followed by presulfurization and then the impregnation of metal Group VIII on the sulfide, allowing metal Group VIII to cover the surface of metal Group VIB in the sulfurization state, thereby enhancing catalyst activity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If metal Group VIB is sulfurized first and then metal Group VIII is added, then metal Group VIII can cover the surface of metal Group VIB sulfide, but the wrapping effect of metal Group VIB sulfide around metal Group VIII sulfide decreases catalyst activity

Engineering Contradiction:

Improvecatalyst activityVSAvoidwrapping effect

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by first impregnating metal Group VIB onto the support, then sulfurizing it to form metal Group VIB sulfide, and finally impregnating metal Group VIII onto the already-formed sulfide surface. This sequence ensures metal Group VIII is deposited on the surface of metal Group VIB sulfide before any wrapping can occur, preventing the harmful effect while maintaining catalyst activity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the catalyst preparation into distinct stages: (1) impregnation of metal Group VIB, (2) sulfurization to form sulfide, and (3) impregnation of metal Group VIII. This segmentation allows precise control over the spatial distribution and surface coverage of each metal component, ensuring optimal surface coverage relationships.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If both metals are impregnated simultaneously, then the preparation process is simpler, but the surface coverage and interaction between metals cannot be controlled

Engineering Contradiction:

Improvepreparation processVSAvoidsurface coverage control

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent divides the impregnation process into two separate sequential impregnation steps rather than a single simultaneous step. This segmentation enables precise control over the surface coverage of each metal component, allowing metal Group VIII to be deposited specifically on the surface of metal Group VIB sulfide with controlled distribution.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary impregnation of metal Group VIB and sulfurization before impregnating metal Group VIII. This preliminary action establishes the foundation layer and surface structure that dictates the subsequent deposition of metal Group VIII, ensuring controlled surface coverage and optimal metal-metal interactions.

Inventive Principle:

Principle #10Preliminary action

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 promotes the generation of Class II active centers, significantly improving the activity of the hydrogenation catalyst by ensuring effective interaction between metal Group VIII and metal Group VIB, leading to enhanced hydrodesulfurization performance.

Implementation Method 1

the sulfurization is firstly performed at a higher pressure and a lower temperature, and then the sulfurization is then performed at a lower pressure and a higher temperature

Methodology Applied

Scientific EffectSulfurization:

Implementation Method 2

The HDS technology is a process of adopting a desulfurization catalyst to react under the conditions of high temperature and high pressure to convert sulfide into H2S for separation

Methodology Applied

Scientific EffectHydrodesulfurization:

Implementation Method 3

The present invention relates to a hydrogenation catalyst, more specifically an oil product hydrogenation catalyst

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Data Source

PatentUS12343709B2Hydrogenation catalyst, preparation process thereof and use thereof

Publication Date: 2025.07.01 CHINA PETROLEUM & CHEMICAL CORP

AI summary

A hydrogenation catalyst contains a hydrogenation catalyst carrier and an active hydrogenation component. The active hydrogenation component includes a Group VIB metal sulfide and a Group VIII metal compound, and the molar proportion of a substance of the Group VIII metal compound that interacts with the Group VIB metal sulfide to the total amount of the Group VIII metal compound is 60-100%. The hydrogenation catalyst has a higher active metal sulfurizing degree and a higher number of type II active centers, and can be applied to the hydrogenation treatment process of oil products such as distillate oils and residual oils.