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Titanium-based nano-composite metal oxide catalyst and preparation method thereof

A nano-composite and oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of narrow active temperature window, poor selectivity, low activity, etc. problem, to achieve the effect of fast combustion process, low cost and low crystallinity

Inactive Publication Date: 2011-07-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the previous NH 3 -SCR vanadium catalysts have low activity at low temperature (400°C), and narrow activity temperature window (300-400°C), aiming at oxidation of various metals According to the different temperature characteristics of the catalytic activity and selectivity of the material, according to the principle of complementary advantages, after many experiments and researches, the first transition metal and rare earth oxides were optimized and combined, and the self-propagating high-temperature combustion synthesis method was used to prepare and research suitable for Diesel NH 3 - Low-high temperature (100-500°C) wide reaction temperature window high activity / high selectivity Ti-V-Mn(Ce) titanium-based nanocomposite metal oxide catalyst for SCR system

Method used

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  • Titanium-based nano-composite metal oxide catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] (1)TiO(NO 3 ) 2 Precursor preparation

[0046] According to the active ingredient VO x with carrier TiO 2 The molar ratio is 0.05:0.95, that is, the molecular formula of the synthesized catalyst is Ti 0.95 V 0.05 o 2-δ ,TiO 2 The loading capacity of the solution is 2g, and the calculated amount of tetra-n-butyl titanate is 8.526g. Weigh the corresponding mass of tetra-n-butyl titanate and stir continuously at room temperature. Under constant stirring, add 30ml of absolute ethanol gradually Add it dropwise to tetra-n-butyl titanate to carry out the alcoholysis of tetra-n-butyl titanate. After fully stirring, a light yellow solution is generated. After dripping the absolute ethanol, slowly add 40ml of deionized water for hydrolysis to obtain milky white TiO (OH) 2 solution, under constant stirring, drop into 27ml concentration again and be the nitric acid of 68% (volume ratio), continue to stir until mixed solution becomes transparent, clear solution after drippin...

Embodiment 2

[0055] (1)TiO(NO 3 ) 2 Precursor preparation

[0056] According to the active ingredient VO x with carrier TiO 2 The molar ratio is 0.1:0.9, that is, the synthesized catalyst molecular formula is Ti 0.9 V 0.1 o 2-δ ,TiO 2 The loading capacity of the solution is 2g, and the calculated amount of tetra-n-butyl titanate is 8.526g. Weigh the corresponding mass of tetra-n-butyl titanate and stir continuously at room temperature. Under constant stirring, add 30ml of absolute ethanol gradually Add it dropwise to tetra-n-butyl titanate to carry out the alcoholysis of tetra-n-butyl titanate. After fully stirring, a light yellow solution is generated. After dripping the absolute ethanol, slowly add 40ml of deionized water for hydrolysis to obtain milky white TiO (OH) 2 Solution, add 27ml concentration under constant stirring and be the nitric acid of 68% (volume ratio), continue to stir until mixed solution becomes transparent, clear solution after dripping, obtain TiO(NO 3 ) 2...

Embodiment 3

[0065] (1)TiO(NO 3 ) 2 Precursor preparation

[0066] According to the active ingredient VO x with carrier TiO 2 The molar ratio is 0.15:0.85, that is, the synthesized catalyst molecular formula is Ti 0.85 V 0.15 o 2-δ ,TiO 2The loading capacity of the solution is 2g, and the calculated amount of tetra-n-butyl titanate is 8.526g. Weigh the corresponding mass of tetra-n-butyl titanate and stir continuously at room temperature. Under constant stirring, add 30ml of absolute ethanol gradually Add it dropwise to tetra-n-butyl titanate to carry out the alcoholysis of tetra-n-butyl titanate. After fully stirring, a light yellow solution is generated. After dripping the absolute ethanol, slowly add 40ml of deionized water for hydrolysis to obtain milky white TiO (OH) 2 Solution, add 27ml concentration under constant stirring and be the nitric acid of 68% (volume ratio), continue to stir until mixed solution becomes transparent, clear solution after dripping, obtain TiO(NO 3 )...

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Abstract

The invention discloses a titanium-based nano-composite metal oxide catalyst and a preparation method thereof, belonging to the technical field of control on exhaust contaminants in diesel engine tail gas. In the invention, the titanium-based nano-composite metal oxide catalyst is prepared by taking TiO2 as a carrier and taking metal oxides (VOx, MnOx and CeOx) as active components by adopting a self-propagating high-temperature synthesis (SHS) method, wherein the molar percentage of the TiO2 is 80-95%, the molar percentage of the VOx is 2-20%, the molar percentage of the MnOx is 2-10%, and the molar percentage of the CeOx is 2-10%. The preparation method of the titanium-based nano-composite metal oxide catalyst comprises the following steps of: preparing a TiO(NO3)2 precursor solution; determining the loads of the active components of the metal oxides; preparing a precursor solution of the active components of the metal oxides; and preparing the catalyst by SHS. The catalyst prepared by the method disclosed by the invention has the advantages of large specific surface area, large pore volume, proper pore size distribution and low degree of crystallization, all active species are highly dispersed and are interactive, the catalyst has higher NOx removing rate and N2 selectivity in a wide temperature window at 100-450 DEG C, and the catalyst has strong anti-sulfur and anti-water poisoning performance and is suitable for treating NOx in diesel engine tail gas of automobiles and ships.

Description

Technical field: [0001] The invention relates to a titanium-based nanocomposite metal oxide catalyst and a preparation method thereof, in particular to a catalyst containing VO x , MnO x , CeO x A variety of active components, with excellent 150 ~ 450 ° C wide reaction temperature window for NH 3 -SCR (Ammonia-Selective Catalytic Reduction) to remove diesel engine NO x The invention discloses a titanium-based nanocomposite metal oxide catalyst and a preparation method thereof, which belong to the technical field of diesel exhaust pollutant control. Background technique; [0002] In recent years, the use of NH 3 -SCR technology to deal with diesel engine NO x Due to its advantages of low fuel consumption, good resistance to sulfur poisoning, and high conversion efficiency, emission is recognized as the most mature and effective measure. Commercial vanadium(V)-based catalysts (V 2 o 5 / WO 3 / TiO 2 ) has high catalytic activity for the standard SCR reaction shown in e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01D53/94B01D53/56
Inventor 管斌林赫黄震
Owner SHANGHAI JIAO TONG UNIV
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