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Method for hoisting degree of silicon entering SAPO-34 molecular sieve framework in synthesized gel rubber

A technology for synthesizing gels and molecular sieves, applied in molecular sieve catalysts, molecular sieves and base-exchange phosphates, molecular sieve characteristic silicoaluminophosphates, etc.

Inactive Publication Date: 2008-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Method for hoisting degree of silicon entering SAPO-34 molecular sieve framework in synthesized gel rubber
  • Method for hoisting degree of silicon entering SAPO-34 molecular sieve framework in synthesized gel rubber
  • Method for hoisting degree of silicon entering SAPO-34 molecular sieve framework in synthesized gel rubber

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Embodiment 1

[0022] The synthetic gel ratio is 3.0 diethylamine: 0.6 SiO 2 :P 2 o 5 : Al 2 o 3 :50H 2 O metering raw material, pseudo-boehmite (containing Al 2 o 3 73%) powder was dissolved in deionized water, and phosphoric acid (containing H 3 PO 4 85%) and silica sol (containing SiO 2 28%). Finally, add diethylamine, stir and mix evenly, then move the mixed material into a stainless steel synthesis kettle and seal it. Crystallize at 200°C and autogenous pressure for 48 hours, wash the solid product with deionized water to neutrality, and dry in air at 100°C to obtain SAPO-34 molecular sieve (number DEA-1), and its XRD analysis is as follows figure 1 shown.

Embodiment 2

[0024] Synthetic gel molar ratio (3.0 diethylamine + 0.5 tripropylamine): 0.6SiO 2 :P 2 o 5 : Al 2 o 3 :50H 2 O metering raw material, pseudo-boehmite (containing Al 2 o 3 73%) powder was dissolved in deionized water, and phosphoric acid (containing H 3 PO 4 85%) and silica sol (containing SiO 2 28%). Finally, add diethylamine and tripropylamine, stir and mix evenly, then move the mixture into a stainless steel synthesis kettle and seal it. Crystallize at 200°C and autogenous pressure for 48 hours, wash the solid product with deionized water to neutrality, and dry it in air at 100°C to obtain SAPO-34 molecular sieve (coded as DEA-2), and its XRD analysis is as follows figure 1 shown.

Embodiment 3

[0026] In terms of synthetic gel ratio (3.0 diethylamine + 1.0 tripropylamine): 0.6SiO 2 :P 2 o 5 : Al 2 o 3 :50H 2 O metering raw material, pseudo-boehmite (containing Al 2 o 3 73%) powder was dissolved in deionized water, and phosphoric acid (containing H 3 PO 4 85%) and silica sol (containing SiO 2 28%). Finally, add diethylamine and tripropylamine, stir and mix evenly, then move the mixture into a stainless steel synthesis kettle and seal it. Crystallize at 200°C and 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-34 molecular sieve (number DEA-3), and its XRD analysis is as follows figure 1 shown.

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Abstract

The invention discloses a process for increasing the degree that silicon in synthetic gel enters the framework of SAPO-34 molecular sieve. The invention is characterized in that diethyl amine is taken as template agent, and simultaneously a specific silicon volume regulator is added to the synthetic gel, thereby achieving the purpose of effectively increasing silicon content of the framework of SAPO-34 molecular sieve. The molecular sieve synthesized by the process of the invention can be used for various acid catalytic reactions, such as the reaction of the conversion of oxygenated compounds to light olefins.

Description

technical field [0001] The invention relates to a method for increasing the degree of silicon in a synthetic gel entering into the framework of a SAPO-34 molecular sieve and the application of the molecular sieve in acid catalyzed reactions. 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 MTO (methanol to light olefins) reaction. The templates used in the initial synthesis of SAPO-34 were expensive tetraethyl...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20
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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