Unlock instant, AI-driven research and patent intelligence for your innovation.

RHO-SAPO molecular sieve, synthetic method and use thereof

A RHO-SAPO, molecular sieve technology, applied in separation methods, molecular sieve catalysts, including molecular sieve catalysts, etc., can solve the problems of low crystallinity of molecular sieve products, increased cost, complexity of steps, and complicated steps, and achieve excellent gas adsorption and separation performance. , the effect of wide chemical composition range and good catalytic performance

Active Publication Date: 2017-06-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of surfactants is relatively expensive; and both the crystallization method and the xerogel synthesis have the defects of complex steps and poor repeatability
The molecular sieve product obtained by the xerogel synthesis method still has problems such as low crystallinity and uncrystallized xerogel in the product
In addition, the thermal synthesis of amines requires the use of a large amount of organic amine templates, and the recovery of these organic amines increases the cost of operation and the complexity of steps
It is worth mentioning that the RHO-SAPO molecular sieves obtained through the above synthesis methods all use diethylamine as a template agent, and the chemical composition of the molecular sieves is narrow and difficult to modulate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • RHO-SAPO molecular sieve, synthetic method and use thereof
  • RHO-SAPO molecular sieve, synthetic method and use thereof
  • RHO-SAPO molecular sieve, synthetic method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The molar proportions of each raw material, crystallization conditions and elemental composition of the samples are shown in Table 1. The specific batching process is as follows: 40.8g aluminum isopropoxide and 121.2g deionized water are mixed, and after stirring evenly, 36.9g of phosphoric acid (H 3 PO 4 Mass percentage composition 85%), then add dropwise 11.9g silica sol (SiO 2 Mass percentage composition 30.24%). 22.0g N, N'-dimethylethylenediamine was added to the previous mixture, and after stirring evenly, the resulting gel was transferred to a stainless steel reaction kettle containing a polytetrafluoroethylene kettle lining. The molar ratio of each component in the synthesis system is 2.5DMEDA:0.6SiO 2 : 1.0Al 2 o 3 : 1.6P 2 o 5 : 75H 2 O.

[0060] After putting the reactor into an oven, the temperature was programmed to rise to 180°C for dynamic crystallization for 48 hours. After the crystallization, the solid product was centrifuged, washed, and dri...

Embodiment 2-17

[0078] Samples of Examples 2-17 were prepared using the sources of aluminum, phosphorus and silicon described in Table 1 in a similar manner to Examples. The samples obtained in Examples 2-17 are analyzed by XRD, and the results are all close to the data in Table 2 of the samples obtained in Example 1, that is, the diffraction peak positions are the same, and the relative peak intensity of the diffraction peaks is in the range of ± 10% according to the change of synthesis conditions Inner fluctuations show that the samples obtained in Examples 2-17 all have the characteristics of the RHO-SAPO structure.

[0079] The inorganic and organic compositions of the samples obtained in Examples 2-17 were analyzed by XRF and CHN elements, and the element composition analysis results of the products are shown in Table 1.

[0080] Carry out to the former powder sample of embodiment 1-12 13 C MAS NMR analysis by reacting with N,N'-dimethylethylenediamine 13 The CMAS NMR standard spectrum...

Embodiment 18

[0082] The corresponding product that embodiment 1-4 obtains is used for CO as catalyst 2 Synthesis of cyclocarbonate by cycloaddition reaction with epichlorohydrin. The implementation details are as follows: 2 0.2 g of molecular sieve catalyst and 2 mL of epichlorohydrin were sequentially added into a 100 mL stainless steel autoclave. The reaction results are shown in Table 3.

[0083] Catalytic results of table 3 cycloaddition reaction a

[0084] catalyst Conversion rates(%) Cyclocarbonate Yield (%) 1 89.6 84.1 2 96.8 93.7 3 86.5 80.7 4 92.7 90.0

[0085] a reaction conditions: epichlorohydrin, 2mL; catalyst, 200mg; CO 2 Pressure, 8bar; temperature, 120°C; reaction time, 4h.

[0086] It can be seen from the results in Table 3 that all synthesized RHO-SAPO molecular sieves have efficient catalytic effects on the reaction, high selectivity, mild reaction conditions, no need for any organic solvent or co-catalyst, and the products...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides an RHO-SAPO molecular sieve. An anhydrous chemical composition of the RHO-SAPO molecular sieve is mDMEDA.(SixAlyPz)O2, wherein DMEDA is N,N'-dimethyl ethidene diamine which is distributed in a molecular sieve cage and a pore canal; m is the mole number of N,N'-dimethyl ethidene diamine in SixAlyPz)O2 per mole, and m is equal to 0.10-0.40; x, y and z separately represent the mole fractions of Si, Al and P and the ranges of Si, Al and P are as follows: x is equal to 0.05-0.35, y is equal to 0.35-0.58 and z is equal to 0.20-0.45, and x+y+z is equal to 1. The RHO-SAPO molecular sieve synthesized by the invention can be used as a cyclic carbonate reaction catalyst, and can be used as an MTO reaction catalyst, a CO2 / N2 gas adsorption separator and the like if being roasted in air at 400-700 DEG C.

Description

technical field [0001] The invention belongs to the field of SAPO molecular sieves, in particular to a RHO-SAPO molecular sieve, its synthesis method and application. Background technique [0002] In 1984, United Carbide Corporation (UCC) first developed the silicoaluminophosphate series SAPO molecular sieve (USP4440871). 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. The Si atom isomorphically replaces part of the P atom in the neutral aluminum phosphate framework structure or simultaneously replaces the P and Al atom positions, so that the framework generates a net negative charge and causes proton acidity, thereby endowing the SAPO molecular sieve with catalytic and gas adsorption and separation properties. [0003] The framework structures of silicoaluminophosphate molecular sieves are various, including SAPO-46, SAPO-37 and SAPO-40...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B39/54C01B37/08B01J29/85C07D317/36C07C1/20C07C11/04C07C11/06B01D53/02
CPCB01D53/02B01D2253/108B01D2257/504B01J29/85C01B37/08C01B39/54C01P2002/72C01P2002/76C01P2002/77C01P2002/80C01P2002/86C01P2004/03C07C1/20C07C2529/85C07D317/36C07C11/04C07C11/06Y02C20/40Y02P20/151Y02P20/50Y02P20/52Y02P30/20Y02P30/40
Inventor 吴鹏飞杨淼田鹏刘中民王林英刘琳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com