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Hydrocarbon adsorption and desorption composite and preparation method thereof

A complex and desorption technology, applied in the field of hydrocarbon adsorption and desorption complexes, can solve the problems of low hydrocarbon adsorption and oxidation capacity, insufficient treatment, performance deterioration of HC traps, etc.

Pending Publication Date: 2022-05-27
高丽大学校算学协力团
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the HC trap made only of zeolite has low hydrocarbon adsorption and oxidation ability at 300°C or lower, which may cause the generation of hydrocarbons in the cold start period until the three-way catalyst reaches the activation temperature. Inadequate treatment and also the problem of deterioration of the performance of the HC trap when large amounts of water (about 10 mol%) are present

Method used

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  • Hydrocarbon adsorption and desorption composite and preparation method thereof
  • Hydrocarbon adsorption and desorption composite and preparation method thereof
  • Hydrocarbon adsorption and desorption composite and preparation method thereof

Examples

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preparation example Construction

[0073] In addition, a method for preparing a hydrocarbon adsorption and desorption complex, comprising:

[0074] preparing zeolite particles containing hydrogen cations by using an ion exchange process; and

[0075] Metal ions and metal oxides are formed by mixing zeolite particles containing hydrogen cations with a solution containing metal ions, wherein,

[0076] In preparing the zeolite particles containing hydrogen cations, the zeolite particles have a sodium to aluminum molar ratio (Na / Al) of 0.2 or less, and

[0077] The metal oxides are formed such that the average diameter of the metal oxides on the zeolite particles is 1 nm to 10 nm.

[0078] The zeolite particles may be ZSM-5 (zeolite socony mobil-5).

[0079] The zeolite particles may be zeolites containing hydrogen cations. Zeolites containing hydrogen cations are prepared by replacing sodium cations in the active sites of the zeolite with hydrogen cations using an ion exchange process in a zeolite precursor.

...

Embodiment 1

[0099] Example 1 (CuHZ)

[0100] Synthesis of NaZ

[0101] 0.98g sodium aluminate (NaAlO 2 , anhydrous, Sigma-Aldrich), 25.45g tetraethylorthosilicate (TEOS, 98%, Sigma-Aldrich) and 18.26g tetrapropylammonium hydroxide (TPAOH, H 2 40 wt% in O) was slowly added to 75.3 g of deionized water. The mixture with a Si / Al ratio of about 10 was stirred at 100°C under reflux in silicone oil for 3 hours and further stirred at room temperature for 24 hours to synthesize the precursor. The prepared synthetic precursor was poured into a Teflon-lined autoclave, and the closed autoclave was transferred to a convection oven preheated to 175 °C and subjected to a hydrothermal reaction for three days while rotating. Then, a series of centrifugation, decantation, and then three washes with deionized water were repeated to recover the resulting solid particles. The recovered particles were further calcined at 550°C for 12 hours under a gas flow of about 300 mL / min at a heating rate of 1°C / min ...

Embodiment 2

[0106] Example 2 (CuHZ_HT)

[0107] Hydrothermal treatment for the hydrocarbon adsorption and desorption complex prepared in Example 1 by passing 10 mol% H under a gas stream at 800°C 2 O steam was carried out for 24 hours to prepare hydrocarbon adsorption and desorption complexes. At this time, the hourly gas flow rate of the simulated exhaust gas including water vapor relative to the weight of the hydrocarbon adsorption and desorption complex was about 100,000 mL / g·h.

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Abstract

Disclosed are a hydrocarbon adsorption and desorption complex comprising a zeolite with a controlled cation type and a method for preparing the same. The hydrocarbon adsorption and desorption composite exhibits excellent hydrocarbon adsorption and oxidation performance even at a temperature lower than a catalyst activation temperature by controlling the distribution of metal ions and metal oxides, and is prepared by means of hydrothermal treatment, and does not undergo oxidation even in the presence of water. The hydrocarbon adsorption and desorption compound also exhibits excellent hydrocarbon adsorption and oxidation properties.

Description

technical field [0001] The present disclosure relates to hydrocarbon adsorption and desorption complexes including zeolites, and more particularly, to hydrocarbon adsorption and desorption complexes that effectively disperse metal ions and metal oxides formed on zeolites by controlling the type of cations in the zeolite structure, and its preparation method. Background technique [0002] With increasing concerns about air pollution, regulations regarding exhaust gas such as carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (HC) or particulate matter (PM) emitted from gasoline vehicles and diesel vehicles are in the United States, Europe, etc. The ground is tightening. In particular, from Euro 1 in 1992 to Euro 6 in 2020, hydrocarbon (HC) emissions should be reduced by at least as much as 80% compared to 1992. In the case of HC emissions from gasoline vehicles, 50% to 80% of the hydrocarbons emitted during operation are emitted during the cold start period when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30B01J20/34B01D53/02
CPCB01J20/186B01J20/28016B01J20/3085B01J20/3466B01D53/02B01D2253/108B01D2258/01B01D2257/702B01J20/28004B01J20/3204B01J20/3236B01J20/183B01J20/3078B01J20/06B01D53/04B01J20/18B01J23/72
Inventor 崔正珪李宽荣金鎭性张恩熙
Owner 高丽大学校算学协力团