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SAPO-35 molecular sieve and synthetic method thereof

A SAPO-35, molecular sieve technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problem of no cation exchange performance and catalytic reaction performance, and achieve the effect of good catalytic performance

Active Publication Date: 2014-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aluminum phosphate molecular sieves are a new generation of molecular sieves (US4310440) invented by UCC in the early 1980s after silicon-aluminum molecular sieves. Since the molecular sieve framework is electrically neutral, it has no cation exchange performance and catalytic reaction performance

Method used

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  • SAPO-35 molecular sieve and synthetic method thereof
  • SAPO-35 molecular sieve and synthetic method thereof
  • SAPO-35 molecular sieve and synthetic method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0046] The molar ratios and crystallization conditions of each raw material are shown in Table 1. The specific batching process is as follows, the pseudo-boehmite (Al 2 o 3 mass percent composition 72.5%) and N, N-ethylethanolamine (mass percent composition 99%) are mixed and stirred, then add silica sol (SiO 2 Mass percent composition 30.04%), stir well, then phosphoric acid (H 3 PO 4 mass percent content 85%) was added dropwise, stirred evenly, then water was added, and finally choline chloride was added, stirred evenly to form a gel, and the gel was transferred to a stainless steel reaction kettle. After putting the reaction kettle into the oven, the temperature was programmed to 200°C for dynamic crystallization for 48 hours. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain the original powder. The samples were analyzed by XRD, and the results showed that the synthesized product had the characteristics of SAPO-3...

Embodiment 2-19

[0054] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as in Example 1. Synthetic samples were analyzed by XRD, and the data results were close to those in Table 2, that is, the peak positions and shapes were the same, and the relative peak intensity of the peaks fluctuated in the range of ±10% according to the change of the synthesis conditions, indicating that the synthetic products had the characteristics of the SAPO-35 structure.

[0055] Carry out to the former powder sample of embodiment 1-7 13 C MAS NMR analysis by combining with choline cation and alcohol amine 13 The C MAS NMR standard spectrum was compared, and it was found that the sample contained both choline cations and corresponding alcohol amines. Quantitative analysis was carried out based on the unique non-overlapping NMR peaks of the two substances to determine the ratio of the two.

[0056] XRF was used to analyze the bulk phase...

Embodiment 20

[0065] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as in Example 1. Only N,N-diethylethanolamine was replaced with triethanolamine. Synthetic samples were analyzed by XRD, and the results showed that the XRD results of the synthetic products were close to those in Table 2, that is, the peak positions and shapes were the same, and the relative peak intensities of each peak fluctuated in the range of ±10%, indicating that the synthetic products had the characteristics of the SAPO-35 structure.

[0066] For raw powder samples 13 The results of C MAS NMR analysis showed that only the characteristic resonance peak of choline was contained.

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Abstract

The invention provides an SAPO-35 molecular sieve having an anhydrous chemical composition of mR1.nCh<+>.(SixAlyPz)O2, wherein R1 is alcohol amine, and Ch<+> is choline cation and is distributed in a molecular sieve cage and pore passages; m is the number of moles of alcohol amine in each mole of (SixAlyPz)O2, n is the number of moles of the choline cation in each mole of (SixAlyPz)O2, m=0-0.03, and n=0.05-0.25; x, y and z respectively represent the molar fractions of Si, Al and P, the scopes of x, y and z are respectively x=0.01-0.30, y=0.35-0.55, z=0.25-0.49, and x+y+z=1. The synthesized SAPO-35 molecular sieve can be used as a catalyst for acid catalytic reactions, such as a reaction of preparing olefin from methanol. The invention also relates to an application of the SAPO-35 molecular sieve in adsorption and separation of CH4, CO2 and N2.

Description

technical field [0001] The invention belongs to the field of SAPO molecular sieves, in particular to a SAPO-35 molecular sieve and a synthesis method thereof. Background technique [0002] Aluminum phosphate molecular sieves are a new generation of molecular sieves (US4310440) invented by UCC in the early 1980s after silicon-aluminum molecular sieves. Since the molecular sieve framework is electrically neutral, it has no cation exchange performance and catalytic reaction performance. [0003] If silicon is introduced into the framework of aluminum phosphate molecular sieve, then it is silicoaluminophosphate molecular sieve, that is, SAPO series molecular sieve (US4440871). There are counter cations outside the framework, so it has cation exchange properties. When the extra-framework cation is H + When , the molecular sieve has an acidic center and will have acid-catalyzed reaction properties. SAPO molecular sieves may be used as active components of catalysts in oil refi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 王德花田鹏刘中民樊栋张莹杨越
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI