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Preparation method of Y molecular sieve catalyst with cordierite as carrier

A supported catalyst, cordierite technology, applied in molecular sieve catalysts, carbon monoxide or formate reaction preparation, chemical instruments and methods, etc.

Active Publication Date: 2017-12-22
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there is no report in the literature that uses cordierite as a carrier, and the carrier is sequentially coated with amorphous SiO 2 Catalyst preparation method for transition coating and Y molecular sieve and its use in the reaction of methylal carbonylation to produce methyl methoxyacetate

Method used

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  • Preparation method of Y molecular sieve catalyst with cordierite as carrier
  • Preparation method of Y molecular sieve catalyst with cordierite as carrier
  • Preparation method of Y molecular sieve catalyst with cordierite as carrier

Examples

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Effect test

Embodiment 1

[0045] To pretreat the cordierite matrix, soak the cordierite in 2 mol L at room temperature -1 In the acid solution, after a certain period of time, the cordierite honeycomb ceramic matrix is ​​prepared by drying and roasting. Place the fired cordierite honeycomb ceramic matrix in 2 mol L -1 SiO 2 In the gel, the silicon source was uniformly attached to the surface of the substrate by ultrasonic impregnation, the impregnation time was 0.5 h, dried at 120 °C, and calcined at 500 °C. The surface is attached with SiO 2 cordierite, NaAlO 2 , SiO 2 Gel, TPAOH and NaOH solution are fully stirred at room temperature for 1~2h according to a certain ratio. The solution was transferred to a stainless steel hydrothermal synthesis kettle with polytetrafluoroethylene lining, and crystallized at 120°C for 14 days. When the reaction time is up, the hydrothermal synthesis kettle is cooled to room temperature and the solution is suction filtered and washed with water until neutral. Dry...

Embodiment 2

[0050] with H 4 EDTA solution removes Al from Y molecular sieve framework to prepare mesoporous H-Y / cordierite catalyst. Add 10 g of H-Y / cordierite catalyst to 200 mL with a concentration of 0.1 mol L -1 H 4 In the EDTA solution, react at 80 °C for 6 h, and then repeat the above steps after suction filtration and water washing until neutral, then place the molecular sieve in an oven to dry at 120 °C for 12 h, and then pass through a muffle furnace to bake at 550 °C for 5 h. h, the molecular sieve prepared at this time is recorded as H-Y-DA / cordierite.

[0051] In the fixed-bed reactor, 1.0 g of the catalysts prepared above were charged respectively, and the pressure in the reaction tube was 5.0 MPa. CO (99.9999%) with a flow rate of 50mL / min is mixed into the reaction tube through a stainless steel reaction tank filled with methylal (DMM) (98wt%) at room temperature (25°C), and the saturated vapor of DMM is mixed into the reaction tube by adjusting the back pressure valve ...

Embodiment 3

[0055]Mesoporous H-Y / cordierite catalyst was prepared by removing Si from molecular sieve framework with ammonia solution. Add 10 g of H-Y / cordierite catalyst to 120 mL with a concentration of 0.05 mol L -1 NH 4 In OH solution, react at room temperature for 1.0 h, then filter and wash with water to neutrality, place the molecular sieve in an oven for 120°C and dry it for 12 hours, then bake it in a muffle furnace at 550°C for 5h. The molecular sieve prepared at this time is marked as H-Y -DS / cordierite. In the fixed-bed reactor, 1 g of the above-mentioned catalysts were charged respectively, and the pressure in the reaction tube was 5 MPa. CO (99.9999%) with a flow rate of 50mL / min is mixed into the reaction tube through a stainless steel reaction tank filled with methylal (DMM) (98wt%) at room temperature (25°C), and the saturated vapor of DMM is mixed into the reaction tube by adjusting the back pressure valve To keep the reaction tube pressure constant. The reaction tem...

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Abstract

The invention relates to a preparation method of a catalyst, in particular to a preparation method of a Y molecular sieve catalyst with cordierite as the carrier. According to the invention, cordierite is adopted as the carrier, a transition coating is coated on the carrier by SiO2 sol liquid dipping, and then the transition coating is coated with a Y molecular sieve to obtain the Y / cordierite catalyst. The method also provides the carrier with high thermal stability at the same time for loading of silicon source and aluminum source, wherein the high thermal stability can improve the heat transfer and mass transfer efficiency of chemical reaction, improve the conversion rate of reactants and the mass selectivity of the product. The loaded Y / cordierite catalyst catalyzes the reaction of methylal and carbon monoxide for synthesis of high purity methyl methoxyacetate, and has very high reaction activity. The invention provides a new method for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a Y molecular sieve catalyst with cordierite as a carrier. Background technique [0002] Methyl methoxyacetate (MMAc) is an important organic chemical raw material, which can be used for the kinetic resolution of chiral amine compounds, the synthesis of vitamin B6 and sulfa-5-pyrimidine, and the catalyst for polymerization reactions; Petroleum route (use cheap and easy-to-obtain methylal as the reaction raw material, synthesize high value-added MMAc through carbonylation reaction) produce the upstream product of ethylene glycol, a bulk chemical raw material, from MMAc (generate ethylene glycol monomethyl ether through hydrogenation reaction , and then generate ethylene glycol through hydrolysis reaction), ethylene glycol is mainly used in polyester fiber, antifreeze, unsaturated polyester resin, lubricant, plasticizer, non-ionic surfactant and explosives...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08C07C67/36C07C69/708
CPCB01J29/084B01J2229/37B01J2229/38B01J2229/60C07C67/36C07C69/708
Inventor 石磊张冬喜王岩
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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