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A kind of high silicon ZSM-5 molecular sieve and its preparation method and application

A technology of ZSM-5 and molecular sieve, which is applied in the direction of molecular sieve catalysts, including molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low selectivity of methanol-to-olefin catalysts and difficult filtration of molecular sieves, so as to improve selectivity and reduce secondary The effect of the reaction

Active Publication Date: 2020-05-01
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-silicon ZSM-5 molecular sieve and its preparation method and application in order to overcome the defects of molecular sieves in the prior art that are not easy to filter and the selectivity of methanol-to-olefins catalyst is low.

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  • A kind of high silicon ZSM-5 molecular sieve and its preparation method and application
  • A kind of high silicon ZSM-5 molecular sieve and its preparation method and application
  • A kind of high silicon ZSM-5 molecular sieve and its preparation method and application

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preparation example Construction

[0014] The invention provides a preparation method of high-silicon ZSM-5 molecular sieve. The method comprises: sequentially uniformly mixing liquid alkaline silicon source, aluminum source, ZSM-5 molecular sieve seed crystal, template agent, alkali, urea and water, aging and hydrothermal synthesis crystallization, wherein, the urea is added in the stage of uniform mixing of raw materials, and the liquid alkaline silicon source is SiO 2 In terms of the aluminum source as Al 2 o 3 Calculated, the mixing ratio of raw materials meets: the mol ratio of described liquid alkaline silicon source, aluminum source, templating agent, alkali, urea and water is 1:(0.001-0.01):(0.025-0.25):(0.02-0.2) :(0.3-4):(8-100), the ZSM-5 molecular sieve seed crystal and SiO in the liquid alkaline silicon source 2 The weight ratio=(1-10):100.

[0015] According to the method of the present invention, the mixing ratio of raw materials is further satisfied: the molar ratio of the liquid alkaline sil...

Embodiment 1

[0039] This example is used to illustrate the high silicon ZSM-5 molecular sieve of the present invention and its preparation method and application.

[0040] (1) Weigh 20g of urea (AR Sinopharm Chemical Reagent Co., Ltd.) and 0.9g of seed crystals (ZSM-5 molecular sieve, the same as other examples), add 54g of deionized water to mix, stir well and then add 1.824g of NaOH (AR Sinopharm Group Chemical Reagent Co., Ltd.) and 49.36g tetrapropylammonium hydroxide template (25% aqueous solution, industrial grade), after stirring for 1h, add 0.08g sodium aluminate (AR Sinopharm Group Chemical Reagent Co., Ltd.), and continue to stir for 10min Add 60.8g silica sol (30%, technical grade, pH value is 9), namely the molar ratio of liquid alkaline silicon source, aluminum source, templating agent, alkali, urea and water is 1:0.0016:0.2:0.15:0.9: 24.4, ZSM-5 molecular sieve seed crystal and SiO in liquid alkaline silicon source 2 The weight ratio of = 5:100. Aging of the obtained mixed ...

Embodiment 2

[0043] This example is used to illustrate the high silicon ZSM-5 molecular sieve of the present invention and its preparation method and application.

[0044] (1) Weigh 54.72g of urea (AR Sinopharm Chemical Reagent Co., Ltd.) and 0.50g seed crystal, add 50g of deionized water to mix, stir well, then add 0.608g NaOH (AR Sinopharm Chemical Reagent Co., Ltd.) and 6.5 Propyl ammonium hydroxide template (25% aqueous solution, industrial grade), after stirring for 1h, add 0.3g sodium aluminate (AR Sinopharm Chemical Reagent Co., Ltd.), continue stirring for 10min and add 60.80g silica sol (30%, industrial grade , pH value is 9), that is, the molar ratio of liquid alkaline silicon source, aluminum source, templating agent, alkali, urea and water is 1:0.006:0.026:0.05:3:17.8, ZSM-5 molecular sieve crystal seed and liquid alkali SiO 2 The weight ratio of = 2.7:100. The obtained mixed solution was aged at room temperature for 16 hours, and the aged reaction solution was transferred in...

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Abstract

The invention relates to the field of methanol-olefin conversion catalysts, discloses a high-silicon ZSM-5 molecular sieve and a preparation method and application thereof, and specifically relates to a preparation method of the high-silicon ZSM-5 molecular sieve. The preparation method comprises the following steps: mixing a liquid alkali silicon source, an aluminum source, a ZSM-5 molecular sieve seed crystal, a template, an alkali, urea and water uniformly in sequence, carrying out aging and hydro-thermal synthesis crystallization, adding urea in the stage of uniformly mixing the raw materials, the liquid alkali silicon source is SiO2, the aluminum source is Al2O3, and the mixing ratio of the raw materials meets that the molar ratio of the liquid alkali silicon source, the aluminum source, the template, the alkali, the urea to the water is 1: (0.001 to 0.01): (0.025 to 0.25): (0.02 to 0.2): (0.3 to 4): (8 to 100), and the weight ratio of the ZSM-5 molecular sieve seed crystal to the SiO2 in the liquid alkali silicon source is (1 to 10): 100. The invention also relates to the high-silicon ZSM-5 molecular sieve prepared by the method and application thereof. When the prepared flaky high-silicon ZSM-5 molecular sieve is used for reactions for catalyzing methanol to propylene and / or butane, the selectivity of C3 and / or C4 olefin products is improved.

Description

technical field [0001] The invention relates to the field of catalysts for methanol conversion to olefins, in particular to a high-silicon ZSM-5 molecular sieve and its preparation method and application. Background technique [0002] Coal or natural gas is used as raw material to synthesize methanol through synthesis gas, and low-carbon olefins can be produced from methanol with high efficiency. A new raw material route has been found for olefin production, which will greatly alleviate the energy crisis caused by oil and natural gas resources. Propylene is an important organic chemical raw material. With the rapid growth of demand for polypropylene and other derivatives, the demand for raw material propylene is also increasing year by year. C4Hs, as the main component of liquefied gas, have been consumed as civil fuels for a long time. The chemical utilization rate of carbon four components in my country is less than 40%, while the chemical utilization rate of carbon four ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C1/20C07C11/08C07C11/06
CPCB01J29/40B01J2229/16C07C1/20C07C2529/40C07C11/08C07C11/06Y02P20/52
Inventor 姜继东邢爱华张新锋冯琦瑶
Owner CHNA ENERGY INVESTMENT CORP LTD
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