Synthesized silicon phosphor aluminum molecular sieve SAPO-34 and method of producing the same

A silicon phosphorus aluminum molecular sieve, SAPO-34 technology, applied in molecular sieve catalyst, molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate and other directions, can solve the problem that molecular sieve grain size is not adjustable and molecular sieve grain size is large , low relative crystallinity, etc., to achieve the effect of being conducive to transportation and storage, stable performance, and low toxicity

Inactive Publication Date: 2008-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method solves the problem that the cost of synthesizing the molecular sieve is high or the crystal grain size of the synthesized molecular sieve is relatively large, the relative crystallinity is low, and the grain size of the molecular sieve cannot be adjusted.

Method used

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  • Synthesized silicon phosphor aluminum molecular sieve SAPO-34 and method of producing the same
  • Synthesized silicon phosphor aluminum molecular sieve SAPO-34 and method of producing the same
  • Synthesized silicon phosphor aluminum molecular sieve SAPO-34 and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]Mix 30.10g (0.147mol) of aluminum isopropoxide with 54.22g (3.01mol) of water, add 8.66g (0.075mol) of phosphoric acid while stirring, continue stirring, add 9.33g (0.045mol) of tetraethyl silicate, and finally add 40% tetraethylammonium phosphate solution 45.35g (0.075mol). The above-mentioned gel solution was transferred to a pressure-resistant container, and was statically crystallized at 200° C. for 120 hours. The solid product was obtained by centrifugation, washed with water, dried at 115° C. for 3 hours, and characterized by X-ray diffraction. The results are shown in Table 1, indicating that the synthesized product is a pure SAPO-34 molecular sieve.

[0039] The scanning electron micrograph and XRD spectrogram of the synthetic SAPO-34 molecular sieve of embodiment 1 are shown in figure 1 with figure 2 . Compared with the scanning electron microscope photos and XRD spectra of the comparative example, it can be seen that the crystallinity and crystallization un...

Embodiment 2

[0041] Except changing tetraethyl silicate into 29.3% silica sol 9.25g (0.045mol), other is the same as embodiment 1. The results of X-ray diffraction showed that the obtained sample was pure SAPO-34 molecular sieve.

Embodiment 3

[0043] Except that the crystallization time is 70 hours, others are the same as Example 2. The results of X-ray diffraction showed that the obtained sample was pure SAPO-34 molecular sieve.

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Abstract

The invention discloses a preparation method of silicon-phosphorus-aluminate molecular sieves SAPO-34 which can be represented by the constitutional formula mR.(Sia.A1b.Pc)O2, wherein, a, b, and c are the molar fractions of Si, A1, and P; m is the molar fraction of a template agent R, and the template agent R is tetraethyl ammonium phosphate. The silicon-phosphorus-aluminate molecular sieves SAPO-34 can be used in the reaction of changing methanol or ether into light carbon olefin. The applied template agent tetraethyl ammonium phosphate has low cost, convenient getting, low toxicity, and stable performance, thereby being beneficial for transportation and storage, and convenient for application in the industrial production.

Description

technical field [0001] The invention relates to a synthetic silicon-phosphorus-aluminum molecular sieve and a preparation method thereof, in particular to a SAPO-34 molecular sieve and a preparation method thereof. Background technique [0002] Synthetic silicon phosphorus aluminum molecular sieve SAPO-34 is a molecular sieve with chabazite-like structure composed of silicon, aluminum, phosphorus and oxygen, and its structural unit is composed of PO 2 + , AlO 2 - , SiO 2 tetrahedron composition. Its structural formula (anhydrous chemical composition) can be mR (Si x ·Al y ·P z )·O 2 where R is the template agent present in the micropores of the molecular sieve crystal, m is the mole number of the template agent R, x, y, z are the mole fractions of Si, Al, and P respectively, and x+y+z=1 . [0003] European patent EP0103117 and U.S. patent US4440871 disclose a kind of hydrothermal synthesis method of SAPO-34 molecular sieve, used the mixture of tetraethylammonium hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85
Inventor 张明森柯丽冯静
Owner CHINA PETROLEUM & CHEM CORP
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