Antimony Oxide Catalyst for Propane Ammoxidation Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The yield of acrylonitrile produced using a composite oxide catalyst with antimony trioxide as the starting material is lower when using propane compared to using propylene, necessitating an improvement in catalyst efficiency for propane-based reactions.
Innovation Solution
Developing an oxide catalyst with antimony particles having a specific surface abundance of pentavalent antimony less than 70 atom % and an average particle size of 1.2 μm or less, formulated into a composite oxide structure including elements like Mo, V, Nb, W, Bi, and silica, optimized for gas-phase catalytic oxidation or ammoxidation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If diantimony trioxide with small particle size (1 μm or less) is used to improve dissolution rate, then the dissolution rate of Sb improves, but the yield of acrylonitrile from propane decreases
Solution Approach 1:
The invention changes the chemical state parameter of antimony on the particle surface by controlling the pentavalent antimony content to be 70 atom % or less. This parameter change resolves the contradiction by achieving both adequate dissolution rate and high acrylonitrile yield from propane, unlike conventional small particle size approaches alone.
Solution Approach 2:
The invention uses a composite oxide catalyst containing multiple elements (Mo, V, Nb, W, Bi, and silica) with controlled antimony content and specific surface composition. This composite structure achieves synergistic effects that simultaneously maintain dissolution rate and improve propane conversion yield.
2Power
If antimony particles with high pentavalent antimony content are used, then catalyst activity improves, but the yield of unsaturated nitrile from propane decreases
Solution Approach 1:
The invention optimizes the pentavalent antimony content parameter to be 70 atom % or less, which balances catalyst activity with selective propane conversion. This parameter control prevents excessive oxidation while maintaining adequate catalytic function, resolving the contradiction between activity and productivity.
3Productivity
If propylene is used as starting material, then high yield of acrylonitrile is achieved, but the process cannot utilize cheaper propane feedstock
Solution Approach 1:
The invention modifies the catalyst parameters (antimony particle size, pentavalent antimony content, and composite oxide composition) to enable efficient propane conversion. These parameter changes make propane, a cheaper feedstock, viable for high-yield acrylonitrile production, replacing the need for more expensive propylene.
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 approach significantly enhances the yield of unsaturated nitriles or unsaturated acids from propane or isobutane, achieving high productivity in gas-phase catalytic processes.
Implementation Method 1
a gas-phase catalytic oxidation reaction or ammoxidation reaction
Data Source
AI summary
The present invention provides a method for producing an oxide catalyst containing antimony, comprisinga step (A) of obtaining the oxide catalyst using antimony particles containing a diantimony trioxide as a source of the antimony,wherein an abundance of a pentavalent antimony in a surface layer of the antimony particle to be measured in XPS analysis is less than 70 atom %, andthe antimony particle has an average particle size of 1.2 μm or less.