Vanadium Pentoxide Catalyst Sintering Suppression
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Solution Overview
Problem
The conventional solid state process for preparing vanadium pentoxide supported on a metal oxide catalyst carrier requires high temperatures for anchoring, leading to sintering of vanadium pentoxide particles and increased grain size, which affects the catalyst's performance.
Innovation Solution
Incorporating an anti-sintering agent, such as tungsten oxide and/or silica, during the calcination process to suppress sintering and maintain the particle size of vanadium pentoxide, allowing effective dispersion and anchoring on the metal oxide carrier at temperatures above 500°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature calcination is used to anchor vanadium pentoxide particles to the carrier, then anchoring strength is improved, but particle sintering increases and grain size grows
Solution Approach 1:
Silica acts as an intermediary substance between vanadium pentoxide particles and the carrier during calcination. The silica prevents direct contact and sintering of V2O5 particles while allowing them to anchor to the carrier, thus maintaining particle size control while achieving strong anchoring.
Solution Approach 2:
Silica serves as a temporary protective barrier during the calcination process. It is added in small amounts, performs its anti-sintering function during the high-temperature treatment, and can be subsequently removed or decomposed, allowing the V2O5 particles to anchor strongly to the carrier without having sintered.
2Manufacturing precision
If high temperature calcination is used to anchor vanadium pentoxide particles, then dispersion and anchoring effectiveness is improved, but sintering of particles occurs
Solution Approach 1:
Silica serves as a protective intermediary that enables effective dispersion and anchoring of V2O5 particles at high temperatures without causing sintering. The silica barrier allows the calcination process to proceed at temperatures sufficient for strong anchoring while preventing particle coalescence.
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 method results in a catalyst with improved dispersion and anchoring of vanadium pentoxide, maintaining particle size and enhancing its oxidation activity and efficiency in applications like nitrogen oxide reduction and hydrocarbon removal from emissions.
Implementation Method 1
the process or method of coating or impregnating a catalyst carrier material with vanadium pentoxide is carried out in the dry state by thermal spreading and anchoring
Implementation Method 2
anchoring the dispersed vanadium pentoxide particles on surface of the metal oxide carrier particles by calcination at a temperature above 500° C.
Implementation Method 3
sintering of the vanadium pentoxide particles is suppressed by addition of an anti-sintering metal oxide component during the anchoring in step c)
Data Source
AI summary
Method for the preparation of a catalyst comprising vanadium pentoxide supported on a metal oxide catalyst carrier comprising the steps of a) providing particles of crystalline vanadium pentoxide and particles of a metal oxide catalyst carrier; b) solid state mixing the particles and dispersing the vanadium pentoxide particles on surface of the metal oxide carrier particles; and c) anchoring the dispersed vanadium pentoxide particles on surface of the metal oxide carrier particles by calcination at a temperature above 500° C., characterized in that sintering of the vanadium pentoxide particles is suppressed by addition of an anti-sintering metal oxide component, such as tungsten trioxide, during the anchoring in step c).