Mo-W-V-Cu Oxide Processing for Higher Activity and Surface Area
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Solution Overview
Problem
Existing processes for producing catalytically active multielement oxides comprising Mo, W, V, and Cu result in low concentrations of these elements in the aqueous solution and a low space-time yield, leading to reduced activity and specific surface area of the oxide.
Innovation Solution
A process involving the controlled addition of sources of W, Mo, V, and Cu to form an aqueous solution, followed by drying and optional comminution to produce a powder, which is then subjected to thermal treatment to achieve a catalytically active multielement oxide with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processes are used to produce multielement oxides with Mo, W, V, and Cu, then the production process is simple, but the space-time yield and concentration of elements in the aqueous solution are low
Solution Approach 1:
The patent applies preliminary action by pre-mixing all sources of elemental constituents (Mo, W, V, and Cu) to form a homogeneous aqueous solution before precipitation. This ensures uniform distribution of all elements throughout the solution, leading to consistent composition in the final oxide product and improved space-time yield without requiring complex post-processing steps.
Solution Approach 2:
The patent employs parameter changes by optimizing the concentration ranges of elemental constituents in the aqueous solution (Mo: 7.2-26.0% by weight, W: 1.6-5.0% by weight) and controlling the pH range (3-8) during precipitation. These parameter optimizations enable higher element concentrations in the solution, directly improving space-time yield while maintaining process simplicity.
2Reliability
If conventional processes are used to produce multielement oxides, then the process is easy to manufacture, but the activity and specific surface area of the oxide are reduced
Solution Approach 1:
The patent applies parameter changes by optimizing thermal treatment conditions (temperature range: 200-600°C, time range: 0.5-10 hours) and element concentration ratios in the aqueous solution. These controlled parameter variations produce oxides with enhanced catalytic activity and specific surface area (16-35 m²/g) while maintaining manufacturing simplicity through standard ceramic processing techniques.
Solution Approach 2:
The patent creates a composite multielement oxide material containing Mo, W, V, and Cu in specific ratios (Mo12WaVbCucSbd where a=0.4-5.0, b=1.0-6.0, c=0.2-1.8, d=0.0-2.0). This composite structure synergistically combines the properties of individual elements, achieving high catalytic activity and surface area while using conventional manufacturing processes.
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 enhances the space-time yield, activity, and specific surface area of the catalytically active multielement oxide, making it more effective for catalyzing the partial gas phase oxidation of acrolein to acrylic acid.
Implementation Method 1
drying the aqueous solution or aqueous suspension obtained in c)
Implementation Method 2
subjecting the powder P obtained in d) or the geometric shaped precursor bodies obtained in e) to thermal treatment to form the catalytically active multielement oxide
Data Source
AI summary
A process for producing a catalytically active multielement oxide comprising the elements Mo, W, V and Cu, wherein at least one source of the elemental constituents W of the multielement oxide is used to produce an aqueous solution, the resultant aqueous solution is admixed with sources of the elemental constituents Mo and V of the multielement oxide, drying of the resultant aqueous solution produces a powder P, the resultant powder P is optionally used to produce geometric shaped precursor bodies, and the powder P is or the geometric shaped precursor bodies are subjected to thermal treatment to form the catalytically active composition, wherein the aqueous solution used for drying comprises from 1.6% to 5.0% by weight of W and from 7.2% to 26.0% by weight of Mo, based in each case on the total amount of aqueous solution.