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

A molecular sieve and catalyst technology, applied in the field of diesel engine catalysts, can solve the problems of human health hazards, deviation of high-efficiency temperature window of vanadium-based catalysts, slow driving speed, etc., and achieve the effects of reducing hazards, expanding high-activity temperature window, and improving low-temperature activity

Inactive Publication Date: 2013-05-08
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 sieves

[0033] 4.9 g of manganese acetate were dissolved in 200 ml of deionized water. Then weigh 15g of molecular sieve powder with H / ZSM-5 and a silicon-alumina ratio of 16:1 into the manganese acetate solution, and reflux and stir on a water bath at 60° C. for 8 hours to perform 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 catalysts

[0036] It is determined that 5-6% of the coating should be applied on 1kg of the cordierite honeycomb ceramic carrier.

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

Embodiment 2

[0044] (1) Modification of molecular sieves

[0045] 9.2 g of manganese acetate were dissolved in 200 ml of deionized water. Then weigh 15g of molecular sieve powder with H / ZSM-5 and a silicon-alumina ratio of 16:1, add it to the manganese acetate solution, and reflux and stir on 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 catalysts

[0048] It is determined that 10-11% of the coating should be applied on 1 kg of the cordierite honeycomb ceramic support.

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

Embodiment 3

[0056] (1) Modification of molecular sieves

[0057] 36.764 g of manganese acetate were dissolved in 200 ml of deionized water. Then weigh 15g of molecular sieve powder with H / ZSM-5 and a silicon-alumina ratio of 16:1, add it to the manganese acetate solution, and reflux and stir on 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 catalysts

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

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

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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, diesel vehicles have lower carbon monoxide (CO) and hydrocarbon (HC) emissions, but their nitrogen oxides (NO x ) and particulate (PM) emissions are high, which not only damages the atmospheric environment, but also seriously threatens human health. Therefore, the pollution control technology of diesel vehicles has attracted widespread public attention. The selective catalytic reduction technology using urea or ammonia as the reducing agent not only has extremely high NOx purification efficiency, but also reduces PM emissions and fuel consumption through matchin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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