Nitrogenous zeolite and preparing method thereof

A zeolite and mordenite technology, applied in chemical instruments and methods, catalyst activation/preparation, molecular sieve catalysts, etc., to achieve the effects of good selectivity, high thermal stability, crystal retention, and high activity

Inactive Publication Date: 2004-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of nitrogen compounds to modif

Method used

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[0015] The preparation method of nitrogen-containing zeolite provided by the present invention comprises the following steps: directly mix ammonium nitrate and zeolite according to the weight ratio of 0.1-30:1, and heat at 50-600° C. for 0.1-15 hours, preferably in airtight Heating at 80-550° C. for 0.5-10 hours under conditions, washing with deionized water, and recovering the obtained zeolite.

[0016] The raw material zeolite can be one or more of the existing aluminosilicate zeolites, can be a zeolite with large pores, such as faujasite, Beta zeolite, omega zeolite, or a zeolite with medium pores, such as Mordenite, ZSM-5, ZSM-11, ZSM-22, ZSM-23, ZSM-35, ZSM-48, ZSM-57 and other zeolites, can also be zeolites with small pores, such as erionite, ZSM-34 zeolite . The raw material zeolite is preferably one or more of Y-type zeolite, mordenite, and zeolite with ZSM-5 structure. The most preferred raw material zeolite is: one or more of HY zeolite, REY zeolite, REHY zeolite, ...

Embodiment 1

[0022] The present invention provides the preparation of nitrogen-containing zeolites.

[0023] (1) take by weighing 200 grams of NaY zeolite (sodium oxide content 12% by weight, unit cell constant 2.468 nanometers) and 2 liters, ammonium sulfate concentration is 0.5 mol / liter, the ammonium sulfate of PH4-5 and the mixed solution of sulfuric acid mix, Perform ion exchange at 80° C. for 1 hour, filter, and wash the solid with deionized water until there is no free acid ion. The ion exchange process was performed twice. The resulting molecular sieve (abbreviated as B) was dried.

[0024] (2) Weigh 150 grams of the above-mentioned molecular sieve B, mix it with 750 grams of ammonium nitrate, and roast it at 300°C for 1 hour under airtight conditions to obtain the nitrogen-containing (elementally, the same below) 0.77 % by weight of Y-type zeolite A1.

Embodiment 2

[0026] Preparation of the nitrogen-containing zeolite provided by the invention.

[0027] Prepared by the same steps as in Example 1, the difference is that the amount of ammonium nitrate in step (2) is 1500 grams, the calcination temperature is 500 ° C, and the calcination time is 0.5 hour to obtain a nitrogen-containing 1.43% by weight Y-type zeolite A2.

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Abstract

A nitrogen-contained zeolite used as the active component of catalyst for catalytic cracking is a crystallized silicoaluminate containing nitrogen (0.01-5 wt%), and is prepared through mixing the ammonium nitrate with the zeolite chosen from Y zeolite, mordenite and ZSM-5 zeolite and heating at 50-600 deg.C for 0.1-15 hr. Its advantages are high thermal stability, activity and selectivity, and good crystal retention.

Description

technical field [0001] The present invention relates to a nitrogen-containing zeolite and a preparation method thereof, in particular to a nitrogen-containing aluminosilicate zeolite and a preparation method thereof. Background technique [0002] USP5545784 discloses a method for modifying zeolites by solid-state ion exchange. The method is to mix the calcined and activated zeolite with a sufficient amount of metal compound, and heat the solid mixture to 400-600°C in the presence of inert gas, then cool it to room temperature, and then heat it at 280-350°C under a hydrogen atmosphere. Restore for 10 to 14 hours. The method can uniformly distribute metal elements inside the zeolite, and the modified zeolite is suitable for olefin hydrogenation. [0003] Nitrogen compounds, especially organic basic nitrogen compounds, can directly occupy the active center of the catalyst with electronic and chemical effects, making it unable to adsorb reactive species, thereby reducing the a...

Claims

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Application Information

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IPC IPC(8): B01J29/06B01J37/00
Inventor 王伟田辉平
Owner CHINA PETROLEUM & CHEM CORP
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