SAPO (silicoaluminophosphate) molecular sieve with RHO skeleton structure and preparation method thereof

A framework structure, molecular sieve technology, applied in molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate and other directions

Active Publication Date: 2011-03-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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At present, there are no public reports on SAPO molecular sieves with RHO structure

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  • SAPO (silicoaluminophosphate) molecular sieve with RHO skeleton structure and preparation method thereof
  • SAPO (silicoaluminophosphate) molecular sieve with RHO skeleton structure and preparation method thereof
  • SAPO (silicoaluminophosphate) molecular sieve with RHO skeleton structure and preparation method thereof

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preparation example Construction

[0046] In the method for preparing SAPO molecular sieves with RHO structure (RHO-SAPO) provided by the present invention, the initial gel needs to be pretreated to make xerogel, or a surfactant is assisted in the preparation of the initial gel.

[0047] The RHO-SAPO molecular sieve synthesized by the invention is characterized in that the molecular sieve crystallization process is a dynamic crystallization process.

Embodiment 1

[0050] 10.48g activated alumina (containing Al 2 o 3 73.5wt%) was dissolved in 78ml deionized water, and 8.94g orthophosphoric acid (containing H 3 PO 4 85wt%) and 8.34g silica sol (containing SiO 2 40wt%). Then, 2.40 g of cetyltrimethylammonium bromide (CTAB) was dissolved and added to the above gel system, stirred vigorously to make the mixture uniform, and finally 7.80 g of diethylamine was added to the gel system. The homogeneously mixed gel mixture was transferred into a stainless steel synthesis kettle, sealed, and dynamically crystallized at 200° C. and autogenous pressure for 72 hours. The solid product was centrifuged, washed with deionized water until neutral, dried in air at 100°C, and calcined in air at 550°C for 5 hours to obtain the RHO-SAPO molecular sieve. Its X-ray spectrum (XRD) see figure 1 Curve A indicates that the synthesized molecular sieve has a RHO structure, and the analysis results are shown in Table 1. The resulting sample was characterized...

Embodiment 2

[0052] In Example 1, only 10.48g of activated alumina was changed to 17.32g of aluminum isopropoxide, and the remaining components and crystallization conditions were unchanged. The obtained samples were analyzed by XRD diffraction, and the results were consistent with the data in Table 1, indicating that the samples synthesized by this method were molecular sieves with RHO structure.

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Abstract

The invention relates to an SAPO (silicoaluminophosphate) molecular sieve with an RHO skeleton structure. The molecular sieve is formed by a PO2+, AlO2- and SiO2 tetrahedron and has a three-dimensional skeleton structure, the anhydrous chemical composition can be shown as mR.(SixAly Pz)O2. The preparation process comprises the following steps of: mixing a silicon source, an aluminum source, a phosphorous source, a surfactant, a template with deionized water to obtain an initial gel mixture; moving the prepared initial gel mixture material to a synthesis reactor for airtight temperature rise and crystallization; and washing and drying a solid crystallized product to obtain SAPO molecular sieve raw powder with the RHO structure; or the preparation process comprises the following steps of: mixing a silicon source, an aluminum source, a phosphorous source with the deionized water to obtain a gel mixture; evaporating the moisture content of the gel mixture to prepare a dry gel; moving the dry gel mixture, the template and the deionized water to the synthesis reactor for airtight rotation and crystallization; and washing and drying the solid crystallized product to obtain the SAPO molecular sieve raw powder with the RHO structure.

Description

technical field [0001] The invention relates to a silicoaluminophosphate molecular sieve RHO-SAPO with an RHO skeleton structure. [0002] The present invention also relates to the preparation method of the above-mentioned molecular sieve. [0003] The present invention also relates to the use of the above-mentioned molecular sieves. Background technique [0004] In 1984, U.S. Patent No. 4,440,871 disclosed the synthesis of a variety of silicoaluminophosphate molecular sieves with different structures. These molecular sieves are SAPO-5, SAPO-11, SAPO-16, SAPO-17, SAPO-20, SAPO-31, SAPO-34, SAPO-35, SAPO-37, SAPO-40, SAPO-41, SAPO-42 and SAPO-44. The technical feature of this kind of SAPO molecular sieve synthesis is to use silicon source, aluminum source, phosphorus source and different templates to synthesize, and the structural unit is composed of PO 2 + , AlO 2 - and SiO 2 Composition of tetrahedrons. Among these molecular sieves, some molecular sieves with small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 苏雄田鹏刘中民许磊张莹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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