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Catalyst for purifying soluble organic matter in diesel vehicle exhaust and preparation method thereof

A catalyst and soluble technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as increased particulate matter emissions, poor oil quality, catalyst poisoning, etc. , achieve the effect of lowering the combustion temperature, lowering the cost, and improving the stability of the texture

Active Publication Date: 2018-07-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, cerium-based catalysts become an important part of DOC, but traditional cerium-based catalyst components will be oxidized to form SO while removing SOF 3 , the resulting SO 3 It is very easy to form sulfurous acid or sulfuric acid with water and then generate sulfate. First, it will cause catalyst poisoning, and second, it will increase the emission of particulate matter.
In particular, the quality of oil products in my country is poor. At present, the S content in 87% of diesel oil exceeds 350ppm, resulting in SO in the exhaust of diesel vehicles. 2 The concentration is high, so the cerium-based catalyst components suitable for the purification of diesel vehicle exhaust in China must have high activity and high selectivity, that is, high activity for SOF, and at the same time for SO 2 low oxidation activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Ce 0.99 V 0.01 o δ -SiO 2 -25% (the molar ratio of Ce to V is 0.99:0.01, SiO 2 The mass fraction is 25%) preparation of composite oxide catalyst.

[0020] First prepare an aqueous solution containing 37.66g of cerium nitrate, put it in a 250ml three-necked bottle, install a reflux condenser, stir mechanically, and then add 4.5ml of H 2 o 2Stir for 30 minutes, add 18ml tetraethyl orthosilicate (TEOS) dropwise, then add 25ml gelling agent-ethanol, keep the oil bath temperature at 50°C, stir for 1 hour, then add dropwise an aqueous solution containing 0.1g ammonium metavanadate, while raising the temperature To 80 ° C, continue to stir for 2h. After the stirring is finished, transfer it to a beaker, add an aqueous solution containing 6g of polyethylene glycol to adjust the slurry, spray dry, control the average particle size of the powder at 5 microns, and dry the obtained powder in vacuum at 120°C for 24h, and then dry it in the air in a muffle furnace. Calcined at...

Embodiment 2

[0022] Ce 0.95 V 0.05 o δ -SiO 2 - Preparation of 10% composite oxide catalyst. Same as the preparation process of Example 1. The difference lies in: the temperature of the oil bath is 65°C; the amount or type of each precursor is different, as shown in Table 1.

[0023] Table 1 Preparation parameters

[0024] Ce 0.95 V 0.05 o δ -SiO 2 -10%

Embodiment 3

[0026] Ce 0.9 V 0.10 o δ -SiO 2 -25% Catalyst preparation process.

[0027] The preparation process is the same as in Example 1, except that the temperature of the oil bath is 70° C.; the amount or type of each precursor is different, as shown in Table 2.

[0028] Table 2 preparation parameters

[0029] Ce 0.9 V 0.10 o δ -SiO 2 -25%

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PUM

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Abstract

The invention relates to a catalyst for purifying soluble organic matter (SOF) in diesel exhaust and a preparation method of the catalyst. The catalyst is a composite oxide catalyst; especially, the catalyst is formed by mixing oxides of cerium, vanadium and silicon. The catalyst is nano particle and is suitable for processing SOF in the diesel exhaust; the process of catalyzing and oxidizing SOF by using the catalyst is simulated by using a TG-DTA combination method; due to the adoption of the catalyst, SOF can begin to convert at 133 DEG C; the activity on catalytic combustion of SOF is equivalent to that of a loaded noble metal catalyst; the catalyst has good sulfur resistance; and meanwhile, the catalyst does not contain noble metal and is low in cost.

Description

technical field [0001] The invention relates to a catalyst for purifying volatile organic compounds in diesel vehicle tail gas, and also relates to a preparation method of the catalyst. The utility model belongs to the technical field of diesel vehicle tail gas purification. Background technique [0002] Diesel vehicles are widely used because of their high fuel economy and long service life. However, dry carbon particles (soot), soluble organic matter (SOF), NO x , HC, CO, etc., which seriously threaten human health (Nejar N., etal. Appl. Catal. B, 2007, 75, 11). Therefore, it is particularly important to develop diesel vehicle exhaust purification technology. There are two ways to purify the exhaust gas of diesel vehicles: internal purification and external purification. Due to the characteristics of convenient use and low cost, the off-machine purification technology has attracted much attention. Diesel vehicle exhaust purification technology includes diesel oxidatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01D53/94B01D53/44
Inventor 陈永东朱元强关小旭周莹陈耀强
Owner SOUTHWEST PETROLEUM UNIV
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