MoVNbTe Catalyst Hydrothermal Synthesis for Ethane Dehydrogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing the M1 phase of MoVNbTe mixed oxides require high-temperature treatments and are inefficient, with challenges in achieving high phase purity and reducing the amount of expensive niobium and tellurium used.
Innovation Solution
A hydrothermal synthesis process involving a mixture of molybdenum, vanadium, niobium, and tellurium starting compounds, with tellurium in the +4 oxidation state, using oxalic acid and other oxo ligands, is used at temperatures between 100 to 300°C, followed by drying and optional calcination, to produce the M1 phase without the need for high-temperature treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature treatment is used to produce M1 phase MoVNbTe mixed oxides, then phase purity is improved, but production cost increases and energy consumption increases
Solution Approach 1:
The invention changes the temperature parameter from high-temperature treatment (>500°C) to low-temperature hydrothermal synthesis (100-300°C). This parameter change enables the formation of pure M1 phase without requiring energy-intensive high-temperature processing, thus resolving the contradiction between phase purity and energy consumption
Solution Approach 2:
The invention utilizes hydrothermal phase transition to directly form the M1 phase from precursor materials in aqueous solution at low temperature. This phase transition mechanism replaces traditional high-temperature solid-state reactions, achieving high phase purity with low energy input
2Manufacturing precision
If traditional synthesis methods are used for MoVNbTe mixed oxides, then M1 phase is produced, but niobium and tellurium content must be high increasing material cost
Solution Approach 1:
The invention changes the stoichiometric parameters of niobium and tellurium from traditional high content (e.g., Mo1V0.15Te0.12Nb0.128O3.7) to reduced content (e.g., Mo1V0.3Nb0.05Te0.05Ox). The hydrothermal synthesis method maintains M1 phase purity even with reduced expensive metal content, resolving the contradiction between phase purity and material cost
Solution Approach 2:
The invention replaces expensive niobium and tellurium materials with cheaper alternatives by reducing their content to minimum necessary levels (Nb: 0.01-0.08, Te: 0.01-0.08 relative to Mo=1). This substitution strategy reduces material cost while maintaining catalytic functionality through the M1 phase structure
3Reliability
If high-temperature treatment is used to produce M1 phase, then catalytic activity is achieved, but production time and energy consumption increase
Solution Approach 1:
The invention changes the temperature parameter from high-temperature treatment (>500°C requiring hours) to low-temperature hydrothermal synthesis (100-300°C completing in minutes to hours). This parameter change accelerates the synthesis process while maintaining catalytic activity, resolving the contradiction between reliability and production time
Solution Approach 2:
The invention performs preliminary hydrothermal treatment to pre-form the M1 phase structure before any optional calcination step. This preliminary action achieves the desired phase structure efficiently, reducing or eliminating the need for time-consuming high-temperature treatment and thereby reducing production time while maintaining catalytic activity
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 allows for the synthesis of highly pure M1 phase MoVNbTe mixed oxide with reduced niobium and tellurium content, achieving high catalytic activity for oxidative dehydrogenation of ethane to ethene without the need for expensive metals, and is more cost-effective.
Implementation Method 1
b) hydrothermal treatment of the mixture of starting compounds at a temperature of from 100 to 300° C. to give a product suspension
Data Source
AI summary
A novel mixed oxide material is disclosed which contains molybdenum, vanadium, tellurium and niobium and the use of the molybdenum mixed oxide material as catalyst for the oxidative dehydrogenation of ethane to ethene or the oxidation of propane to acrylic acid and a process for producing the mixed oxide material.