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Method for improving tail gas catalytic performance of nano diesel engine in SCR temperature zone

A technology of SCR catalyst and catalytic performance, which is applied in the direction of chemical instruments and methods, separation methods, molecular sieve catalysts, etc., can solve the problem that the control of nitrogen oxides cannot achieve the desired effect, and achieve saving production costs and improving yield and quality , Reduce the effect of welding steps

Pending Publication Date: 2020-11-17
HUNAN JIANTE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that no one can ideally cover the temperature range of the diesel engine, resulting in the control of nitrogen oxides in the exhaust gas not achieving the desired effect

Method used

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  • Method for improving tail gas catalytic performance of nano diesel engine in SCR temperature zone
  • Method for improving tail gas catalytic performance of nano diesel engine in SCR temperature zone
  • Method for improving tail gas catalytic performance of nano diesel engine in SCR temperature zone

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Experimental program
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Effect test

Embodiment 1

[0028] In this embodiment, a coating sample is made, the activity of nano-platinum oxide as the main catalytic element is tested, and the coating is compared with the coating made of traditional industrial platinum salt. The cerium-zirconium solid solution and modified alumina produced by Bojing are used as the main coating materials, and the ratio of γ-modified alumina, cerium-zirconium solid solution 1055 and cerium-zirconium solid solution 1062 for making samples is 1:0.5:0.5. Sample 1 was added with nano-platinum oxide gel solution, sample 2 was added with industrialized platinum nitrate solution, and the platinum content (weight) in the samples was both 2.50%. The pH value of the sample slurry is about 3. After being fully stirred, it is dried (100°C) and roasted (650°C). The uniform powder formed is used as the test sample, and finally the temperature programmed reduction (TPR) test is carried out.

Embodiment 2

[0030] Three pieces of catalyst supports are used, which are made of cylindrical cordierite ceramic supports with a pore density of 300 mesh (number of pores per square inch), a diameter of 25.0 mm, and a length of 40.0 mm. The embodiment adopts two kinds of formulations to make test samples. Formula A adopts vanadium-based SCR with a moderate temperature zone, applies tungsten-titanium powder DT52 for SCR purposes in Shanghai Canal, and adds vanadium pentoxide (V 2 o 5 ), tungsten and titanium powder are added into an acidic aqueous solution, (modulated to pH3.0-3.5 with deionized water and 2% concentrated nitric acid or acetic acid), and form a coating slurry with a pH of 3.0-3.5 after 1 hour of ball milling; B formula adopts The copper-based molecular sieve material of the Shanghai Canal, model Cu-TZB223L, with a copper oxide content of about 4.0%, was added to an acidic solution (adjusted to pH 3.0-3.5 with deionized water and 2% concentrated nitric acid or acetic acid), ...

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Abstract

The invention discloses a method for improving the tail gas catalytic performance of a nano diesel engine in an SCR temperature zone. An SCR catalytic carrier is coated with an SCR catalyst coating, and the SCR catalyst coating comprises at least two of a high-temperature SCR coating, a medium-temperature SCR coating and a low-temperature SCR coating. According to the invention, the activity of the SCR catalyst is improved by applying the combination of the existing SCR formula technology, nano noble metal catalysis technology and system, the effective temperature zone of the catalyst is expanded, so that the purpose of more effectively controlling nitrogen oxide in diesel engine tail gas is achieved, and the simplicity, practicability and cost control of the system are ensured at the sametime.

Description

Technical field: [0001] The invention relates to the field of post-treatment catalysts for diesel engine tail gas control, in particular to a method for improving catalytic performance of nano diesel engine tail gas in the SCR temperature zone. Background technique: [0002] Nitrogen oxides in air pollution are mainly nitric oxide (NO) and nitrogen dioxide (NO2), collectively referred to as nitrogen oxides (plus N2O, collectively referred to as NOx), and their main sources are mobile sources (vehicles, accounting for about 50%) and Stationary sources (thermal power plants, etc., accounting for more than 45%). Nitrogen oxides (NOx) are one of the main harmful substances in the exhaust gas of internal combustion engines (mainly piston gasoline engines and diesel engines), and are also the main cause of acid rain and photochemical smog. The nitrogen oxide control technology of gasoline engines is relatively mature. Under the combustion conditions of theoretical air-fuel ratio,...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J29/00B01J23/63B01J23/30B01D53/94B01D53/56
CPCB01J37/0244B01J23/63B01J23/30B01J29/00B01D53/9418B01D2258/012Y02T10/12
Inventor 姚小刚姚建辉刘劲松向珣殷立华
Owner HUNAN JIANTE TECH CO LTD