Catalyst Preparation for Oxidative Dehydrogenation
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Solution Overview
Problem
The existing methods for preparing metal oxide catalysts for oxidative dehydrogenation have limited spinel phase structure proportion due to iron and metal ions being discharged with wastewater during filtration, resulting in insufficient butadiene selectivity and yield.
Innovation Solution
A method involving the preparation of an aqueous iron-metal precursor solution by dissolving trivalent cation iron and divalent cation zinc precursors, reacting with ammonia water, and filtering without washing, followed by heating, to maintain iron and zinc ions in the slurry and promote a high spinel phase structure, optimizing the mole ratio of ammonia water to iron-metal cations and concentration for efficient catalyst formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If iron and metal ions are discharged with wastewater during filtration, then the filtration process is completed, but the spinel phase structure proportion is limited
Solution Approach 1:
The patent recovers iron and metal ions that would otherwise be lost in wastewater by implementing a specific filtration process without complete washing. The filtrate containing dissolved ions is retained and reused, allowing these ions to be recovered and incorporated into the catalyst structure, thereby maintaining high spinel phase proportion while reducing substance loss.
Solution Approach 2:
The patent changes the filtration parameter by controlling the washing step to retain some filtrate rather than completely removing it. This parameter change allows iron and metal ions to remain in the slurry, promoting the formation of spinel phase structure during heating while still completing the filtration process.
2Reliability
If washing is performed after filtration, then the filtrate is cleaned, but iron and metal ions are discharged with wastewater
Solution Approach 1:
The patent applies partial washing action instead of complete washing. By controlling the washing step to retain some filtrate, the process achieves sufficient cleaning while preventing complete discharge of iron and metal ions. This partial action maintains catalyst performance requirements while reducing substance loss.
3Ease of manufacture
If the preparation process is simplified, then the manufacturing cost is reduced, but the spinel phase structure proportion may be limited
Solution Approach 1:
The patent makes the system self-service by retaining and reusing the filtrate containing iron and metal ions. This self-service approach eliminates the need for complex additional recovery processes while naturally achieving high spinel phase proportion through the retained ions, thereby simplifying the overall preparation process without sacrificing manufacturing precision.
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 method results in a catalyst with a high spinel phase structure proportion, enhancing butadiene generation efficiency and simplifying the preparation process, achieving superior butadiene production comparable to commercially available catalysts.
Implementation Method 1
reacting with ammonia water, and filtering without washing, followed by heating
Implementation Method 2
filtering without washing, followed by heating
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a method of preparing a catalyst for oxidative dehydrogenation. More particularly, the method of preparing a catalyst for oxidative dehydrogenation includes a first step of preparing an aqueous iron-metal precursor solution by dissolving a trivalent cation iron (Fe) precursor and a divalent cation metal (A) precursor in distilled water; a second step of obtaining a slurry of an iron-metal oxide by reacting the aqueous iron-metal precursor solution with ammonia water in a coprecipitation bath to form an iron-metal oxide (step b) and then filtering the iron-metal oxide; and a third step of heating the iron-metal oxide slurry. In accordance with the present invention, a metal oxide catalyst, as a catalyst for oxidative dehydrogenation, having a high spinel phase structure proportion may be economically prepared by a simple process.