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SAPO-34 molecular sieve and synthesis method thereof

A SAPO-34, molecular sieve technology, applied in the field of SAPO molecular sieve, to achieve the effect of excellent catalytic performance

Active Publication Date: 2014-03-26
中科催化新技术(大连)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that although the range of templates in the above literature reports includes diisopropylamine, it is not done in the examples.

Method used

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  • SAPO-34 molecular sieve and synthesis method thereof
  • SAPO-34 molecular sieve and synthesis method thereof
  • SAPO-34 molecular sieve and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The dosage and crystallization conditions of ingredients are shown in Table 1. The specific batching process is as follows, 14.06g pseudo-boehmite (Al 2 o 3 Mass percent composition 72.5%) and 90g deionized water are mixed and stirred evenly, then 23.0g phosphoric acid (H 3 PO 4 mass percent content 85%) dropwise into, stir evenly, then add 6.4g silica sol (SiO 2 30% by mass percentage) and 1.09g cetyltrimethylammonium bromide (CTAB), after adding 30.4g diisopropylamine (DIPA for short, 99% by mass) to the mixture at last, the gel Transfer to a stainless steel reaction kettle. The molar ratio of each component in the synthesis system is 3.0DIPA:0.30SiO 2 : 1Al 2 o 3 : 1P 2 o 5 :0.03CTAB:50H 2 O.

[0045] The synthesis kettle was heated to 200°C for dynamic crystallization for 24 hours. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain 27.6 g of the original powder. The sample was analyzed by XRD, and t...

Embodiment 2-17

[0055] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as in Example 1.

[0056] 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-34 structure.

[0057] The surface and bulk phase element compositions of the molecular sieve products were analyzed by XPS and XRF, and the ratio of the silicon content on the outer surface to the bulk phase silicon content is listed in Table 1.

[0058] CHN elemental analysis was carried out on the raw powder samples of Examples 2-17, which showed that the C / N molar ratio fluctuated at 6.0±0.05. The results of CHN elemental analysis and the composition of inorganic element...

Embodiment 18

[0061] 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 the surfactant BM was replaced by the mixture of CTAB and OTAB, and the synthesis process was carried out statically. 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-34 structure.

[0062] The surface and bulk phase element compositions of the molecular sieve products were analyzed by XPS and XRF, and the ratio of the silicon content on the outer surface to the bulk phase silicon content is listed in Table 1.

[0063] The CHN elemental analysis of the raw powder sample of Example 18 showed that the C / N molar ratio was 5.95. T...

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Abstract

The invention discloses a SAPO-34 molecular sieve. The invention is characterized in that the anhydrous chemical composition of the molecular sieve can be mDIPA.(SixAlyPz)O2, wherein DIPA is diisopropylamine and is distributed in molecular sieve cages and pores; m is the mole number of the diisopropylamine template in every mole of (SixAlyPz)O2, and m=0.03-0.25; and x, y and z respectively represent mole fractions of Si, Al and P, x=0.01-0.30, y=0.40-0.60, z=0.25-0.49, and x+y+z=1. The molecular sieve surface is slightly rich in silicon, and the ratio of the silicon content on the external surface to the bulk-phase silicon content in the crystal is 1.48-1.01. The invention relates to a synthesis and preparation method of the SAPO-34 molecular sieve. The invention also relates to application of the SAPO-34 molecular sieve in acid catalyzed reaction. The invention also relates to application of the SAPO-34 molecular sieve in catalysis of reaction for preparing low-carbon olefins by converting oxygen-containing compounds.

Description

technical field [0001] The invention belongs to the field of SAPO molecular sieves, and in particular relates to a SAPO-34 molecular sieve using diisopropylamine as a template agent and a hydrothermal synthesis method of the SAPO-34 molecular sieve. Background technique [0002] Since a series of aluminum phosphate molecular sieves and their derivatives were successfully synthesized in 1982 in the patent US 4310440 applied by Union Carbide, aluminum phosphate molecular sieves and their heteroatom-substituted derivatives have been researched in the field of materials and catalysis. One of the hot spots. Among them, SAPO-34, a silicon-phosphorus-aluminum molecular sieve with a CHA topology, exhibits excellent catalytic performance in the methanol-to-olefins (MTO) reaction due to its suitable pore structure and acidic properties (Applied Catalysis, 1988, 40:316) . [0003] SAPO-34 is a chabazite-type (CHA) molecular sieve, which has an eight-membered ring ellipsoidal cage and...

Claims

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Application Information

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IPC IPC(8): C01B39/54
Inventor 樊栋田鹏刘中民苏雄张莹杨越
Owner 中科催化新技术(大连)股份有限公司
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