Mixed Catalyst for Propane Oxidation Yield
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Solution Overview
Problem
Existing catalysts for vapor-phase catalytic oxidation and ammoxidation of propane or isobutane yield unsaturated acids or nitriles at insufficient levels, despite improvements in catalyst activity through tungsten impregnation or immersion, without achieving high yields.
Innovation Solution
A mixed catalyst comprising a Mo-V-Nb-W-based composite oxide and a tungsten compound at specific ratios, where the tungsten compound is not part of the composite oxide, is used in vapor-phase catalytic oxidation or ammoxidation reactions, enhancing the yield of unsaturated acids or nitriles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tungsten impregnation or immersion is used to improve catalyst activity, then catalyst performance is enhanced, but yield of unsaturated acids or nitriles remains insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by incorporating specific ratios of Mo, V, Nb, W, and Sb oxides, along with rare earth metal components. This compositional parameter optimization resolves the contradiction by achieving both improved catalyst performance and high yield of unsaturated products simultaneously
Solution Approach 2:
The patent creates a composite oxide catalyst combining multiple metal oxides (MoO3, V2O5, Nb2O5, WO3, Sb2O3) with rare earth metals. This composite structure synergistically enhances both catalyst reliability and productivity, overcoming the limitation of single-component or simple impregnated catalysts
2Ease of operation
If Mo-V-Sb-Nb-based catalyst is used for vapor-phase catalytic oxidation or ammoxidation, then reaction can proceed, but yield of target product is insufficient
Solution Approach 1:
The patent optimizes the atomic ratio parameters of the catalyst components, specifically incorporating rare earth metals at controlled concentrations. This parameter adjustment maintains ease of operation while dramatically improving target product yield beyond what conventional Mo-V-Sb-Nb catalysts achieve
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 mixed catalyst significantly increases the yield of unsaturated acids or nitriles from propane or isobutane, with the tungsten compound diffusing on the composite oxide surface to reform the catalyst surface, improving performance and maintaining catalyst activity over time.
Implementation Method 1
the tungsten compound diffusing on the composite oxide surface to reform the catalyst surface
Implementation Method 2
a mixed catalyst for a vapor-phase catalytic oxidation reaction or a vapor-phase catalytic ammoxidation reaction of propane or isobutane
Data Source
AI summary
It is an object of the present invention to provide a mixed catalyst for a vapor-phase catalytic oxidation or a vapor-phase catalytic ammoxidation reaction of propane or isobutane, capable of providing a corresponding unsaturated acid or unsaturated nitrile at high yield from propane or isobutane. A mixed catalyst for a vapor-phase catalytic oxidation reaction or a vapor-phase catalytic ammoxidation reaction of propane or isobutane comprises: (a) a composite oxide represented by the following composition formula (1): Mo1VaNbbSbcWdZeOn (1) wherein Z represents at least one element selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; each of a, b, c, d, e, and n represents an atomic ratio of each element based on Mo atom; a is in a range of 0.01 ≤ a ≤ 1; b is in a range of 0.01 ≤ b ≤ 1; c is in a range of 0.01 ≤ c ≤ 1; d is in a range of 0.001 ≤ d ≤ 1; e is in a range of 0 ≤ e ≤ 1; and n represents a number determined by the valence of a component metal; and (b) a tungsten compound at a ratio of the following formula (2): 0.001<w<0.3 wherein w represents an atomic ratio of tungsten in the tungsten compound as an atomic ratio based on Mo atom in the composite oxide.