Desulfurizing adsorbent Ag2O/NaY based on molecular screen and preparation method thereof

A molecular sieve and adsorbent technology, used in chemical instruments and methods, other chemical processes, gas fuels, etc., can solve the problems of insufficient utilization of active components, agglomeration of active components, and decreased adsorption capacity, and achieve excellent two The effect of sulfide adsorption capacity, reduction of agglomeration, and improvement of service life

Inactive Publication Date: 2013-07-10
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the active components loaded too much are likely to cause the aggregation of the active components, or even block ...

Method used

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  • Desulfurizing adsorbent Ag2O/NaY based on molecular screen and preparation method thereof
  • Desulfurizing adsorbent Ag2O/NaY based on molecular screen and preparation method thereof
  • Desulfurizing adsorbent Ag2O/NaY based on molecular screen and preparation method thereof

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preparation example Construction

[0027] Ag of the present invention 2 The preparation method of O / NaY renewable desulfurization adsorbent comprises the following steps:

[0028] (A) NaY molecular sieve raw powder was roasted at 550°C for 4h, and slowly cooled to room temperature;

[0029] (B) Granulating the molecular sieve obtained in step (A) to make 40-60 mesh particles;

[0030] (C) Determination of the water absorption of the carrier. Take a certain amount of the granulated carrier obtained in step (B), and dry it at 110°C to constant weight, then weigh a certain amount of the dried carrier, add distilled water dropwise, shake while adding, until the carrier is completely wet, and There is obvious water present on the container wall, which is no longer adsorbed by the carrier. Record the amount of water absorbed by the carrier per unit mass.

[0031] (D) Put a certain amount of the granulated carrier obtained in step (B) and ground urea into a closed container, vacuumize the closed container, and t...

Embodiment 1

[0045] (A) Weigh 10g of NaY molecular sieve, bake it in a muffle furnace at 550°C for 4 hours, cool slowly to room temperature, and then press it into 40-60 mesh particles; the XRD pattern of NaY molecular sieve is as follows figure 1 As shown, the specific surface area of ​​the NaY molecular sieve carrier measured by the BET method is 541.1m 2 / g.

[0046] (B) Weigh a certain amount of the carrier in (A), dry it in an oven at 110°C to constant weight, weigh 1g of 40-60 mesh NaY molecular sieve carrier particles, and slowly add deionized water dropwise to it, adding lightly while adding Shake lightly until the carrier is completely wet, and there is obvious water on the container wall, which is no longer adsorbed by the carrier. The measured water absorption per unit mass of the carrier is: 1.52 g water / g carrier.

[0047] (C) Weigh 5g of NaY molecular sieve carrier particles of 40-60 mesh, put them together with 1g of urea ground into powder into a closed container for ...

Embodiment 2

[0057] Adopt the method of embodiment 1, weigh starting material AgNO respectively 3 0.00g, 0.073g, 0.220g, 0.367g, 0.513g, 0.733g were dissolved in 7.60g deionized water respectively to obtain a desulfurization agent preparation solution, and then the NaY molecular sieve carriers pretreated with urea were impregnated with equal volume and dried , roasted, and cooled to room temperature to obtain Ag 2 Desulfurization adsorbents A1, B1, C1, D1, E1, F1 with O content of 0wt.%, 1wt.%, 3wt.%, 5wt.%, 7wt.%, 10wt.%, respectively.

[0058] The X-ray diffraction pattern of the prepared adsorbent is as follows figure 2 shown. The XRD spectrum of the prepared adsorbent is basically the same as that of the unmodified NaY molecular sieve, indicating that the structure of the molecular sieve is still well preserved during the process of impregnation and roasting, and the modified adsorbent still retains the unique properties of NaY molecular sieve. The pore structure, and no new crysta...

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Abstract

The invention relates to a desulfurizing adsorbent Ag2O/NaY based on a molecular screen and a preparation method thereof, belonging to the technical filed of desulfurizing adsorbents. The preparation method mainly comprises the steps of carrier pretreatment based on a urea sublimation and desublimation method; incipient impregnation of a NaY type molecular screen by using a silver salt solution and calcining of the Y type molecular screen. The desulfurizing adsorbent Ag2O/NaY based on a molecular screen has an excellent performance of dispersing the active components of carriers and therefore has an excellent adsorbent desulfurizing performance although the content of Ag2O is little; so that an excellent desulfurizing effect with lower cost can be achieved by using the desulfurizing adsorbent based on a molecular screen to remove disulfides in hydrocarbon fuel.

Description

technical field [0001] The present invention relates to a molecular sieve-based adsorbent for deep desulfurization, more particularly, the present invention relates to such molecular sieve-based adsorbent Ag for deep desulfurization 2 O / NaY has excellent dispersibility for active components and excellent ability to remove disulfides at room temperature, and belongs to the technical field of desulfurization adsorbents. Background technique [0002] With the development of petrochemical industry, liquefied petroleum gas (LPG), as a basic chemical raw material and new fuel, has been paid more and more attention by people. Liquefied petroleum gas (LPG) often contains H 2 S, mercaptan and other sulfides, which will cause corrosion of equipment, poisoning and deactivation of catalysts in the subsequent processing, and SO produced by combustion x Pollution of the environment and the formation of acid rain have serious impacts and damages on the ecological environment, human healt...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30C10L3/12
Inventor 陈标华吕丽丹张傑黄崇品李英霞
Owner BEIJING UNIV OF CHEM TECH
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