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Nano SAPO (silicoaluminophosphate)-34 molecular sieve with spherical or flaky appearance, synthetic method thereof, catalyst prepared by same and application thereof

A SAPO-34, molecular sieve technology, applied in molecular sieve catalyst, molecular sieve and alkali exchange phosphate, hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problem of single shape and size of SAPO-34 molecular sieve, and achieve long single-pass catalytic life. , The synthesis is simple and fast, the effect of various grain morphologies

Inactive Publication Date: 2013-04-03
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above patents all adopt the traditional hydrothermal synthesis method, and the synthesized SAPO-34 molecular sieve has a single shape and size, and the minimum particle size is only about 500nm

Method used

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  • Nano SAPO (silicoaluminophosphate)-34 molecular sieve with spherical or flaky appearance, synthetic method thereof, catalyst prepared by same and application thereof
  • Nano SAPO (silicoaluminophosphate)-34 molecular sieve with spherical or flaky appearance, synthetic method thereof, catalyst prepared by same and application thereof
  • Nano SAPO (silicoaluminophosphate)-34 molecular sieve with spherical or flaky appearance, synthetic method thereof, catalyst prepared by same and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Mix 48.7g of pseudo-boehmite, 27.5g of silica sol, and 50.0g of deionized water for 1 hour at room temperature to obtain a mixed solution A; add 83.7g of orthophosphoric acid and 322.5g of tetraethyl hydroxide to the mixed solution A in turn ammonium and continue to stir for 1 hour to obtain mixed solution B, which is the initial gel mixture of SAPO-34 molecular sieves. The initial gel mixture was put into a high-pressure reactor with a polytetrafluoroethylene liner. After sealing, the reactor was placed in a microwave reactor, heated to 165° C., and crystallized at a constant temperature under autogenous pressure for 0.75 hours. After the reaction kettle is cooled, the solid product is centrifuged, washed with deionized water until neutral, and dried overnight in a constant temperature oven at 120°C to obtain the original SAPO-34 molecular sieve powder, which is then roasted at 550°C for 6 hours to remove tetraethyl groups. After ammonium hydroxide, the S-1 sample was o...

Embodiment 2

[0037] Mix and stir 48.7g pseudo-boehmite, 27.5g silica sol and 60.0g deionized water for 1 hour at room temperature to obtain mixed solution A; add 83.7g orthophosphoric acid and 76.0g triethylamine to mixed solution A in turn and continue Stir for 1 hour to obtain mixed solution B, that is, the SAPO-34 molecular sieve initial gel mixture. The initial gel mixture was put into a high-pressure reactor with a polytetrafluoroethylene liner. After sealing, the reactor was placed in a microwave reactor, heated to 165° C., and crystallized at a constant temperature under autogenous pressure for 0.75 hours. After the reaction kettle is cooled, the solid product is centrifuged, washed with deionized water until neutral, and dried overnight in a thermostat at 120°C to obtain the raw SAPO-34 molecular sieve powder, which is then roasted at 550°C for 6 hours to remove triethylamine After that, the S-2 sample was obtained. The XRD spectrum of the S-2 sample is as follows figure 1 As sho...

Embodiment 3

[0039] Mix 48.7g of pseudo-boehmite, 27.5g of silica sol, and 50.0g of deionized water for 1 hour at room temperature to obtain a mixed solution A; add 83.7g of orthophosphoric acid and 322.5g of tetraethyl hydroxide to the mixed solution A in turn ammonium and continue to stir for 1 hour to obtain mixed solution B, which is the initial gel mixture of SAPO-34 molecular sieves. The initial gel mixture was put into a high-pressure reactor with a polytetrafluoroethylene liner. After sealing, the reactor was placed in a microwave reactor, heated to 165° C., and crystallized at a constant temperature under autogenous pressure for 1.5 hours. After the reaction kettle is cooled, the solid product is centrifuged, washed with deionized water until neutral, and dried overnight in a constant temperature oven at 120°C to obtain the original SAPO-34 molecular sieve powder, which is then roasted at 550°C for 6 hours to remove tetraethyl groups. After ammonium hydroxide, the S-3 sample was o...

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Abstract

The invention discloses a nano SAPO (silicoaluminophosphate)-34 molecular sieve with a spherical or flaky appearance, a synthetic method of the nano SAPO-34 molecular sieve and a methanol to olefin catalyst prepared by the molecular sieve. The SAPO-34 molecular sieve is prepared in a microwave heating manner. The nano spherical or flaky SAPO-34 molecular sieve can be obtained by controlling microwave synthesis conditions, is a sphere having a crystal grain size less than 30nm or a sheet having a thickness less than 70nm, and the has the characteristics of short synthetic time, controllable crystal grain appearance and the like. A molecular sieve catalyst prepared by the molecular sieve is used for reactions of methanol to olefin, such as methanol to ethylene, methanol to propylene and the like, wherein a methanol conversion rate can reach 100%, the selectivity of C2 to C4 can reach 89.85%, the single pass life of the catalyst can reach 350 minutes.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and relates to a SAPO-34 molecular sieve and a synthesis method thereof, in particular to a nano SAPO-34 molecular sieve with a spherical or flake shape prepared by using a microwave heating method. The present invention also relates to the catalyst prepared by the above-mentioned SAPO-34 molecular sieve and its application in the reaction of methanol to light olefins. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important chemical raw materials, and the supply of low-carbon olefins in my country is seriously in short supply. The main raw material for producing low-carbon olefins is petroleum, and the shortage of petroleum resources has caused the price of low-carbon olefins to remain high. It is imminent to develop a technology for producing low-carbon olefins from non-petroleum raw materials. In view of the characteristics of my country's rich coal reso...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B01J29/85C07C1/20C07C11/02B82Y30/00
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 孙予罕吴磊刘子玉夏林丘明煌刘旭朱浩佳孙志强刘斌王东飞
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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