Catalyst Preparation Using Dialkyl Succinate Impregnation
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Solution Overview
Problem
Existing catalyst preparation methods for hydrotreatment and hydroconversion processes do not achieve optimal catalytic activity, particularly when using dried, calcined, or regenerated catalysts, as they lack the effectiveness provided by the combination of C1-C4 dialkyl succinates and carboxylic acids.
Innovation Solution
A process involving the impregnation of a catalytic precursor with a solution containing C1-C4 dialkyl succinate and a carboxylic acid other than acetic acid, followed by maturing and drying at controlled temperatures, without subsequent calcination, to enhance catalytic activity, and subsequent sulphuration to activate the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalyst preparation methods are used, then the catalyst can be produced with standard procedures, but the catalytic activity is not optimal
Solution Approach 1:
The patent applies preliminary action by introducing C1-C4 dialkyl succinates and carboxylic acids onto the catalytic precursor before the main catalytic function is activated. This pre-treatment modifies the surface properties and chemical environment of the catalyst support, creating optimal conditions for enhanced catalytic activity during subsequent hydrotreatment and hydroconversion processes.
Solution Approach 2:
The patent employs composite materials by combining the catalytic precursor with C1-C4 dialkyl succinates and carboxylic acids to create a multi-component system. This composite structure integrates the base catalyst with organic modifiers that work synergistically to improve catalytic performance, particularly in maintaining stability and activity during regeneration cycles.
2Reliability
If C1-C4 dialkyl succinate and carboxylic acid are introduced together, then catalytic activity is significantly improved, but the process complexity increases
Solution Approach 1:
The patent merges two separate treatment steps into a single combined impregnation process. Both C1-C4 dialkyl succinates and carboxylic acids are introduced simultaneously onto the catalytic precursor in one operation, eliminating the need for sequential treatment steps. This merging approach maintains the synergistic benefits of both compounds while simplifying the overall manufacturing process.
3Stability of the object's composition
If calcination is performed after impregnation, then the catalyst structure is stabilized, but the organic additives are lost
Solution Approach 1:
The patent converts the typically harmful effect of calcination (which destroys organic molecules) into a beneficial process by performing low-temperature treatment that selectively removes unwanted volatile components while preserving the thermally stable C1-C4 dialkyl succinates and carboxylic acids. This approach uses controlled thermal treatment to enhance catalyst activation without sacrificing the organic additives.
Solution Approach 2:
The patent applies parameter changes by modifying the temperature and duration of the heat treatment step. Instead of conventional high-temperature calcination, the process uses controlled low-temperature treatment conditions that are sufficient to activate the catalyst and remove volatiles but low enough to preserve the organic additives. This parameter optimization resolves the contradiction between structure stabilization and additive retention.
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 process significantly improves catalytic activity by maintaining the presence of characteristic Raman bands associated with Keggin heteropolyanions and dialkyl succinates, leading to enhanced performance in hydrotreatment and hydroconversion processes.
Implementation Method 1
The invention concerns a process for the preparation of a catalyst comprising a support and a hydro-dehydrogenating function, said process comprising the introduction of an additive which is a C1-C4 dialkyl succinate
Implementation Method 2
followed by maturing and drying at controlled temperatures
Data Source
AI summary
A process for the preparation of a catalyst from a catalytic precursor comprising a support based on alumina and/or silica-alumina and/or zeolite and comprising at least one element of group VIB and optionally at least one element of group VIII, by impregnation of said precursor with a solution of a C1-C4 dialkyl succinate. An impregnation step for impregnation of said precursor which is dried, calcined or regenerated, with at least one solution containing at least one carboxylic acid other than acetic acid, then maturing and drying at a temperature less than or equal to 200° C., optionally a heat treatment at a temperature lower than 350° C., followed by an impregnation step with a solution containing at least one C1-C4 dialkyl succinate followed by maturing and drying at a temperature less than 200° C. without subsequent calcination step. The catalyst is used in hydrotreatment and/or hydroconversion.