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Manganese modified molecular sieve type selective catalytic reduction catalyst for diesel engine

A molecular sieve, diesel engine technology, applied in molecular sieve catalysts, physical/chemical process catalysts, mechanical equipment, etc., can solve the problems of human health hazards, slow driving speed, and deviation of high-efficiency temperature window of vanadium-based catalysts, and achieve lower hazards and low-temperature activity. Improve and expand the effect of high activity temperature window

Inactive Publication Date: 2011-09-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's urban roads are crowded, driving speed is slow, and the engine exhaust temperature is often lower than 280 ° C, which has a certain deviation from the high-efficiency temperature window of vanadium-based catalysts; at the same time, V 2 o 5 It is a highly toxic substance that is harmful to human health

Method used

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  • Manganese modified molecular sieve type selective catalytic reduction catalyst for diesel engine
  • Manganese modified molecular sieve type selective catalytic reduction catalyst for diesel engine
  • Manganese modified molecular sieve type selective catalytic reduction catalyst for diesel engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Modification of molecular sieve

[0033] Dissolve 4.9 g of manganese acetate in 200 ml of deionized water. Then weigh 15g of molecular sieve powder whose model is: H / ZSM-5 and whose silicon-aluminum ratio is 16:1, add it into the manganese acetate solution, and reflux and stir in a water bath at 60° C. for 8 hours to carry out ion exchange.

[0034] The reaction mixture after the exchange was completed was filtered, and the filtered solid powder was dried at 80° C. for 12 h, and then calcined at 550° C. for 5 h.

[0035] (2) Preparation of supported catalyst

[0036] It is determined to coat 5-6% of the coating on 1 kg of cordierite honeycomb ceramic carrier.

[0037] 20g of γ-Al is required for every 100g of modified molecular sieve powder 2 o 3 , 5g pseudo-boehmite, 10g cerium-zirconium, 5g polyethylene glycol (average molecular weight 4000) and the ratio of 50g nitric acid, weigh the powder catalyst, γ-Al 2 o 3 , pseudoboehmite, cerium-zirconium and polyethyl...

Embodiment 2

[0044] (1) Modification of molecular sieve

[0045] Dissolve 9.2 g of manganese acetate in 200 ml of deionized water. Then weigh 15g of molecular sieve powder with the model: H / ZSM-5 and the silicon-aluminum ratio of 16:1, add it to the manganese acetate solution, and reflux and stir in a water bath at 75°C for 6h to perform ion exchange.

[0046] The reaction mixture after the exchange was completed was filtered, and the filtered solid powder was dried at 100° C. for 10 h, and then calcined at 600° C. for 4 h.

[0047] (2) Preparation of supported catalyst

[0048] It is determined to coat 10-11% of the coating on 1 kg of cordierite honeycomb ceramic carrier.

[0049] 30g of γ-Al is required for every 100g of modified molecular sieve powder 2 o 3 , 8g pseudo-boehmite, 8g cerium zirconium, 10g polyethylene glycol (average molecular weight 4000) and 50g nitric acid ratio, weigh modified molecular sieve powder, γ-Al 2 o 3 , pseudoboehmite, cerium-zirconium and polyethylene...

Embodiment 3

[0056] (1) Modification of molecular sieve

[0057] 36.764 g of manganese acetate was dissolved in 200 ml of deionized water. Then weigh 15g of molecular sieve powder with the model: H / ZSM-5 and the silicon-aluminum ratio of 16:1, add it to the manganese acetate solution, and reflux and stir in a water bath at 90°C for 4 hours to perform ion exchange.

[0058] The reaction mixture after the exchange was completed was filtered, and the filtered solid powder was dried at 100° C. for 10 h, and then calcined at 600° C. for 4 h.

[0059] (2) Preparation of supported catalyst

[0060] It is determined that 9-10% of the coating should be coated on 1 kg of cordierite honeycomb ceramic carrier.

[0061] 20g of γ-Al is required for every 100g of modified molecular sieve powder 2 o 3 , 5g pseudo-boehmite, 5g cerium-zirconium, 5g polyethylene glycol (average molecular weight 4000) and the ratio of 50g nitric acid, weigh modified molecular sieve powder, γ-Al 2 o 3 , pseudoboehmite, c...

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Abstract

The invention discloses a manganese modified molecular sieve type selective catalytic reduction catalyst for a diesel engine. In the catalyst, a cordierite honeycomb ceramic is taken as a carrier material, main active ingredients are Mn2+ ions and manganese oxide particles entering a molecular sieve through ion exchange; and the residual non-exchanged H+ and a silicon-aluminum skeleton structure in the molecular sieve are respectively used as a cocatalyst and a coating matrix. In the molecular sieve powder subjected to ion exchange modification, the manganese element is 0.6 to 9.2 weight percent; and in the supported catalyst consisting of the cordierite honeycomb ceramic carrier and the coating, the coating is 5 to 15 weight percent. The preparation method comprises modification of the molecular sieve and preparation of the supported catalyst. In the catalyst, urea or ammonia is taken as a reducing agent, and NOx and HC is removed from exhaust of the diesel engine through selective catalytic reduction reaction. The Mn / ZSM-5 catalyst is prepared from a nontoxic and harmfulless H / ZSM-5 molecular sieve and manganous nitrate through ion exchange modification, and harm to the environment is reduced.

Description

technical field [0001] The invention belongs to a catalyst for diesel engines, in particular to a manganese-modified molecular sieve type catalyst for selective catalytic reduction and removal of nitrogen oxides and a preparation method thereof. Background technique [0002] Due to the high power, high thermal efficiency, and durability of diesel engines, diesel vehicles are widely used in China. Generally speaking, the carbon monoxide (CO) and hydrocarbon (HC) emissions of diesel vehicles are relatively low, but their nitrogen oxides (NO x ) and particulate (PM) emissions are high, which not only damage the atmospheric environment, but also seriously threaten human health. Therefore, the pollution control technology of diesel vehicles has aroused widespread public concern. The selective catalytic reduction technology using urea or ammonia as the reducing agent not only has extremely high NOx purification efficiency, but also can reduce PM emissions and fuel consumption thr...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01D53/94B01D53/56
CPCY02T10/24Y02T10/12
Inventor 吕刚宋崇林宾峰张清茂
Owner TIANJIN UNIV
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