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Method for synthesizing SAPO-11 and SAPO-34 molecular sieve with diethylamine as template agent

A technology of SAPO-11 and SAPO-34, applied in the field of molecular sieve preparation

Active Publication Date: 2008-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using diethylamine as a template, under the conditions of conventional synthetic molecular sieves, the method of synthesizing SAPO-11 and SAPO-34 molecular sieves by adjusting the different ratios of diethylamine and phosphorus sources in the synthetic gel has not been reported in the public literature.

Method used

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  • Method for synthesizing SAPO-11 and SAPO-34 molecular sieve with diethylamine as template agent
  • Method for synthesizing SAPO-11 and SAPO-34 molecular sieve with diethylamine as template agent
  • Method for synthesizing SAPO-11 and SAPO-34 molecular sieve with diethylamine as template agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 (SAPO-11)

[0017] 14.04g pseudo-boehmite (containing Al 2 o 3 72.6%) powder was dissolved in 74ml deionized water, and 23.06g phosphoric acid (containing H 3 PO 4 85%) and 12.82g silica sol (containing SiO 2 28.1%). Add 4.41g diethylamine (analytical pure) at last, after stirring and mixing evenly, this mixed material is moved into the stainless steel synthesis kettle and seals. Crystallize at 180°C under autogenous pressure for 24 hours, wash the solid product with deionized water until neutral, and dry it in air at 100°C to obtain SAPO-11 molecular sieve, whose XRD analysis is shown in Table 1.

[0018] Table 1

[0019]

[0020]

Embodiment 2

[0021] Example 2 (SAPO-11)

[0022] In Example 1, only the amount of silica sol was changed to 2.14 g, and the remaining components and operating conditions were unchanged. The obtained product was analyzed by XRD diffraction to be SAPO-11 molecular sieve.

Embodiment 3

[0023] Example 3 (SAPO-11)

[0024] In Example 1, only the amount of diethylamine was changed to 5.88 g, and the remaining components and operating conditions were unchanged. The obtained product was analyzed by XRD diffraction to be SAPO-11 molecular sieve.

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Abstract

Provided is a process for synthesizing molecular sieves of SAPO-11 and SAPO-34 with diethyl amine as template agent. Phosphorus source, aluminum source, silica source and the template agent are taken as raw materials, and SAPO-11 and SAPO-34 are prepared by controlling the proportion (0<R / P2O5<=6.0) of the template agent R and the phosphorus source in synthetic gel. When SAPO-11 is prepared, 0<R / P2O5<=0.8, when SAPO-34 is prepared, 0<R / P2O5<=6.0, and when the proportion of R / P2O5 is between 0.8 and 1.5, symbiotic mixture of SAPO-11 and SAPO-34 with different proportions is formed. The molecular sieves synthesized by the process of the invention can be used as catalyst for acid catalytic reaction, such as the reaction of the conversion of methanol to olefins.

Description

technical field [0001] The invention relates to a preparation method of molecular sieves, which is to synthesize SAPO-11 and SAPO-34 molecular sieves by adjusting the different ratios of template agent diethylamine and phosphorus source in the synthetic gel, and the synthesis of molecular sieves in the acid-catalyzed reaction application. Background technique [0002] U.S. Patent USP 4440871 once disclosed the synthesis method of silicoaluminophosphate molecular sieves including SAPO-11 and SAPO-34. SAPO molecular sieves, some of which have small pore structures such as SAPO-34 have been successfully used in MTO (methanol to low-carbon olefins) or SDTO (synthesis gas through dimethyl ether to low-carbon olefins) and other processes, the medium-pore SAPO -11 also shows excellent catalytic performance in hydrocracking, isomerization and other reactions. [0003] Both SAPO-11 and SAPO-34 structural units are composed of PO 2 + , AlO 2 - and SiO 2 Composed of tetrahedrons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/08C07C1/20
Inventor 刘广宇田鹏刘中民许磊周帆
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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