Method for quickly synthesizing SAPO(silicoaluminophosphate)-34 molecular sieve and catalyst prepared from molecular sieve

A SAPO-34, molecular sieve technology, applied in the direction of molecular sieve catalyst, molecular sieve and alkali exchange phosphate, physical/chemical process catalyst, etc., can solve the problems of unable to obtain crystal products, low synthesis yield, long crystallization time, etc. Excellent catalytic performance, less dosage and longer reaction life

Active Publication Date: 2015-06-17
中科催化新技术(大连)股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent 20030231999 reported the use of organic matter containing N, N-dimethylamine groups as a template to synthesize low-silicon SAPO-34 molecular sieves. In this patent, fluoride ions were added to the initial gel system to achieve the synthesis of low-silicon SAPO-34 The purpose of molecular sieves, crystal products cannot be obtained in low-silicon synthesis systems without fluoride ions
In general, the synthetic processes reported in these patents all have long crystallization time and low synthetic yields.

Method used

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  • Method for quickly synthesizing SAPO(silicoaluminophosphate)-34 molecular sieve and catalyst prepared from molecular sieve
  • Method for quickly synthesizing SAPO(silicoaluminophosphate)-34 molecular sieve and catalyst prepared from molecular sieve
  • Method for quickly synthesizing SAPO(silicoaluminophosphate)-34 molecular sieve and catalyst prepared from molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-18

[0035] See Table 1 for specific batching dosage and crystallization conditions. The specific batching process is as follows. Mix and stir the aluminum source and the organic amine, and record it 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 same, and the relative peak intensity of e...

Embodiment 19

[0044] The batching process, batching dosage and crystallization conditions are the same as in Example 1, only the organic amine is changed to 35g N, N-dimethylcyclohexylamine and 28g N, N-dimethyl n-butylamine. After crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain 20.2g of raw powder (15% weight loss on calcination at 600°C), and the solid yield was 92%. 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.

Embodiment 20

[0046] 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-dimethylcyclohexylamine and 30g N,N-dimethylcyclohexylamine. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain 19.5g of raw powder (14.5% weight loss on calcination at 600°C), and the solid yield was 89.5%. 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.

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Abstract

The invention discloses a method for quickly synthesizing an SAPO-34 molecular sieve and a catalyst prepared from the molecular sieve. The method is characterized in that the organic amine with a (CH3)2NR structure is used as a major solvent and a template agent for synthesis to perform molecular sieve synthesis.

Description

technical field [0001] The invention relates to a rapid synthesis method of SAPO-34 molecular sieve. [0002] The invention also relates to the catalytic application of the above-mentioned material in the reaction of converting oxygen-containing compounds into light olefins. Background technique [0003] 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). [0004] SAPO-34 molecular sieves are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/08C01B39/54B01J29/85C07C11/04C07C11/06C07C1/20
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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