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Silicoaluminophosphate molecular sieve with CHA (chabasite) structure and synthesis method thereof

A molecular sieve, CH3 technology, applied in molecular sieve catalyst, molecular sieve and alkali exchange phosphate, molecular sieve characteristic silico-aluminophosphate and other directions, can solve the problem of corrosion of synthesis kettle, reduce the amount of waste liquid generated, is conducive to separation and recycling , the effect of improving the synthesis yield

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

The existence of fluoride ions in the above-mentioned AlPO-34 and SAPO-34 molecular sieve synthesis system corrodes the synthesis kettle is a problem that cannot be ignored in its large-scale production

Method used

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  • Silicoaluminophosphate molecular sieve with CHA (chabasite) structure and synthesis method thereof
  • Silicoaluminophosphate molecular sieve with CHA (chabasite) structure and synthesis method thereof
  • Silicoaluminophosphate molecular sieve with CHA (chabasite) structure and synthesis method thereof

Examples

Experimental program
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Embodiment 1-18

[0045] See Table 1 for specific batching dosage and crystallization conditions. The specific batching process is as follows, the aluminum source and the organic amine (99.5wt% in purity) are mixed and stirred evenly, which is recorded as mixture A. Mix silicon source, phosphorus source and deionized water and stir for 30 minutes, then add the mixture to A, stir vigorously for 30 minutes in a closed state to make it evenly mixed, then transfer the gel to a stainless steel reaction kettle, heat up to a certain temperature and dynamically Crystallize for a certain period of time. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain the original powder. The sample was analyzed by XRD, and the result showed that the synthesized product was SAPO-34 molecular sieve. The XRD data of the product of Example 1 is shown in Table 2. The XRD results of Examples 2-18 are close to those of Example 1, that is, the peak positions are the sa...

Embodiment 19

[0054]The batching process, batching dosage and crystallization conditions are the same as in Example 1, only the organic amine is changed to 30g N, N, N', N'-tetramethylethylenediamine and 30g N, N, N', N'-tetramethyl Propylenediamine. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain 19.4g of the original powder (15% weight loss on calcination at 600°C), and the solid yield was 88.5%. The sample was analyzed by XRD, and the XRD result was close to that of Example 1, that is, the peak position was the same, and the relative peak intensity of each peak fluctuated within ±10%, indicating that the synthesized product was SAPO-34 molecular sieve. Surface and bulk elemental composition of molecular sieve products were analyzed by XPS and XRF, Si 外 / Si 体 The ratio is 1.25.

Embodiment 20

[0056] The batching process, batching dosage and crystallization conditions are the same as in Example 1, only the organic amine is changed to 40g N, N, N', N'-tetramethylpropylenediamine and 20g N, N, N', N'-tetramethyl Base-1,2-propanediamine. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain 20.1 g of raw powder (16.5% weight loss on calcination at 600°C), and the solid yield was 90.1%. The sample was analyzed by XRD, and the XRD result was close to the sample in Example 1, that is, the peak position was the same, and the relative peak intensity of each peak fluctuated in the range of ±10%, indicating that the synthesized product was SAPO-34 molecular sieve. Surface and bulk elemental composition of molecular sieve products were analyzed by XPS and XRF, Si 外 / Si 体 The ratio is 1.15.

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Abstract

A silicoaluminophosphate molecular sieve with a CHA (chabasite) structure and a synthesis method thereof are provided. The invention relates to an SAPO (silicoaluminophosphate)-34 molecular sieve and a synthesis method thereof. The molecular sieve is characterized in that the molecular sieve micropore contains a template agent SDA (Structure-Directing Agent), the molecular sieve crystal surface is slightly enriched with silicon, and ratio of outside surface silicon content to crystal bulk silicon content is 1.50-1.01. The SDA is organic amine with a (CH3)2NRN(CH3)2 structure, and R is C2-C5 saturated straight chain or straight chain alkyl. After being roasted in air at 400-700 DEG C, the molecular sieve can be used as a catalyst and a gas adsorbent of acid catalyzed reaction and oxygen-containing compound conversion alkene preparation reaction.

Description

[0001] The invention relates to a silicoaluminophosphate molecular sieve with a CHA structure and a synthesis method thereof, as well as the catalytic application of the above-mentioned material in acid catalyzed reaction and conversion of oxygen-containing compounds to prepare low-carbon olefins. Background technique [0002] In 1984, United Carbide Corporation (UCC) developed the SAPO molecular sieve series of silicoaluminophosphate (USP 4440871). The molecular sieve is a kind of crystalline silicoaluminophosphate, and its three-dimensional framework structure is composed of PO 2 + , AlO 2 - and SiO 2 tetrahedron composition. Among them, SAPO-34 is a chabazite-like structure, the main channel is composed of eight rings, and the orifice is 0.38nm×0.38nm. Due to its suitable acidity and pore structure, SAPO-34 molecular sieve has attracted much attention because of its excellent catalytic performance in the reaction of methanol to light olefins (MTO). [0003] SAPO-34 mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 田鹏刘中民樊栋苏雄张莹杨越
Owner 中科催化新技术(大连)股份有限公司
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