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Titanium-based multi-metal oxide catalyst for removing diesel engine NOx by NH3-SCR in wide temperature window

A technology of NH3-SCR and multiple metals, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of narrow activation temperature window and poor selectivity, Achieve the effects of enhancing oxygen recovery performance, improving high temperature activity, and reducing NOx

Inactive Publication Date: 2010-12-01
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 (450°C), and narrow activity temperature window (250-450°C), aiming at oxidation of various metals According to the different temperature characteristics of the catalytic activity and selectivity of the catalyst, according to the principle of complementary advantages, after many experiments and researches, the research and design of NH suitable for diesel vehicles 3 -Low-high temperature (100~550℃) wide reaction temperature window of SCR system, high activity / high selectivity V 2 o 5 -WO 3 -MoO 3 -MnO 3 -CeO 2 -Fe 2 o 3 / TiO 2 Multiple Metal Oxide Catalysts

Method used

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  • Titanium-based multi-metal oxide catalyst for removing diesel engine NOx by NH3-SCR in wide temperature window
  • Titanium-based multi-metal oxide catalyst for removing diesel engine NOx by NH3-SCR in wide temperature window
  • Titanium-based multi-metal oxide catalyst for removing diesel engine NOx by NH3-SCR in wide temperature window

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) TiO 2 preactivation process

[0035] Nano TiO 2 Mix with water, heat at 60°C for 24h, heat and activate at 120°C for 72h, grind and tablet, and screen out 60-100 mesh activated TiO 2 Particles;

[0036] (2) Determination of the main active components of metal oxides and the loading of co-catalysts

[0037] Follow V 2 o 5 : CeO 2 :MnO 2 : Fe 2 o 3 : WO 3 : MoO 3 :TiO 2 =1: 2: 5: 2: 3: 5: 82 mass ratio calculates and obtains the consumption of catalyst loading medicine to be respectively: ammonium metavanadate 0.643g, cerium nitrate 2.523g, manganese acetate 7.048g, ferric nitrate 1.262g, tungsten Ammonium Acid 1.64g, Ammonium Molybdate 3.066g, Nano TiO 2 41g.

[0038] (3) WO 3 、MoO 3 cocatalyst and V 2 o 5 , CeO 2 , MnO 2 , Fe 2 o 3 Loading of main active ingredient

[0039]Weigh 1.64g ammonium tungstate and dissolve it in 307ml deionized water; then weigh 3.066g ammonium molybdate and dissolve it in 1000ml deionized water; weigh 2.5g polyviny...

Embodiment 2

[0041] (1) TiO 2 preactivation process

[0042] Nano TiO 2 Mix with water, heat at 60°C for 24h, heat and activate at 120°C for 72h, grind and tablet, and screen out 60-100 mesh activated TiO 2 particle.

[0043] (2) Determination of the main active components of metal oxides and the loading of co-catalysts

[0044] Follow V 2 o 5 : CeO 2 :MnO 2 : Fe 2 o 3 : WO 3 : MoO 3 :TiO 2 = 1.5: 3: 5: 2: 3: 5: 80.5 The mass ratio calculated to obtain the consumption of catalyst loaded medicine is respectively: ammonium metavanadate 0.965g, cerium nitrate 3.785g, manganese acetate 2.819g, ferric nitrate 1.262g, tungsten Ammonium Acid 1.64g, Ammonium Molybdate 3.066g, Nano TiO 2 40.25g.

[0045] (3) WO 3 、MoO 3 cocatalyst and V 2 o 5 , CeO 2 , MnO 2 , Fe 2 o 3 Loading of main active ingredient

[0046] Weigh 1.64g ammonium tungstate and dissolve it in 307ml deionized water; then weigh 3.066g ammonium molybdate and dissolve it in 1000ml deionized water; weigh 2.5g po...

Embodiment 3

[0048] (1) TiO 2 preactivation process

[0049] Nano TiO 2 Mix with water, heat at 60°C for 24h, heat and activate at 120°C for 72h, grind and tablet, and screen out 60-100 mesh activated TiO 2 particle.

[0050] (2) Determination of the main active components of metal oxides and the loading of co-catalysts

[0051] Follow V 2 o 5 : CeO 2 :MnO 2 : Fe 2 o 3 : WO 3 : MoO 3 :TiO 2 =1: 4: 5: 2: 3: 5: 80 mass ratio calculates and obtains the consumption of catalyst loading medicine to be respectively: ammonium metavanadate 0.643g, cerium nitrate 5.047g, manganese acetate 2.819g, ferric nitrate 1.262g, tungsten Ammonium Acid 1.64g, Ammonium Molybdate 3.066g, Nano TiO 2 40g.

[0052] (3) WO 3 、MoO 3 cocatalyst and V 2 o 5 , CeO 2 , MnO 2 , Fe 2 o 3 Loading of main active ingredient

[0053] Weigh 1.64g ammonium tungstate and dissolve it in 307ml deionized water; then weigh 3.066g ammonium molybdate and dissolve it in 1000ml deionized water; weigh 2.5g polyvinyl...

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Abstract

The invention relates to a titanium-based multi-metal oxide catalyst for removing diesel engine NOx by NH3-SCR in a wide temperature window, belonging to the technical field of exhaust contaminant control on diesel engine tail gas. The catalyst uses nano TiO2 as a carrier, uses metal oxides V2O5, CeO2, MnO2 and Fe2O3 as main active components, and uses WO3 and MoO3 as catalyst promoter components, wherein the contents of the main active component in the catalyst respectively are as follows in percentage by weight: 48-84% of TiO2, 1-3% of V2O5, 5-15% of MnO2, 1-5% of CeO2, 1-5% of Fe2O3, 3-9% of WO3 and 5-15% of MoO3. The preparation process of the catalyst comprises the following steps: pre-activating the TiO2; and determining charge numbers of the metal oxide main active components and the catalyst promoters, and charging the metal oxide main active components and the catalyst promoters. By replacing high poisonous V oxides with Ce, Mn and Fe oxides, the invention reduces environmental hazard of the catalyst, greatly improves the low-temperature activation and the high-temperature selectivity, and effectively decreases NOx in the wide temperature window of 100-550 DEG C. The catalyst has high sulfur poisoning resistance and water poisoning resistance, and is suitable for high-sulfur diesel fuel and urban road conditions in China.

Description

Technical field: [0001] The present invention relates to a wide temperature window NH 3 -SCR (Ammonia-Selective Catalytic Reduction) to remove diesel engine NO x Titanium-based multi-metal oxide catalysts, especially one containing V 2 o 5 、WO 3 、MoO 3 , MnO 2 , CeO 2 , Fe 2 o 3 , with an excellent 100-550 °C wide reaction temperature window NH 3 -SCR removes diesel engine NO x A titanium-based multi-element metal oxide catalyst belongs to the technical field of diesel exhaust pollutant control. Background technique: [0002] Combustion optimization combined with urea (Urea)-SCR is considered to be the NO x The best solution to meet Euro V or even higher emission standards. In recent years, Urea-SCR technology for vehicles has become the focus of attention at home and abroad. Urea-SCR is essentially NH 3 Selective catalytic reduction reaction for reducing agent, because urea does not directly interact with NO x reaction, but first evaporated and pyrolyzed into...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/94B01D53/56
CPCY02T10/24Y02T10/12
Inventor 管斌林赫黄震
Owner SHANGHAI JIAO TONG UNIV
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