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Preparation method of rare-earth modified MCM-48 loaded double-function catalyst

A MCM-48, bifunctional catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of poor preparation repeatability, reduced specific surface area, Low acid strength, etc., to achieve the effect of enhanced catalytic activity, enhanced hydrothermal stability, and enhanced acidity

Inactive Publication Date: 2014-02-05
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of rare earth modified MCM-48 supported bifunctional catalyst, which is used to solve the problems of the prior art that the MCM-48 skeleton is mixed with rare earth, and the specific surface area is greatly reduced, and the rare earth is replaced by a rare earth oxide. The form blocks the pores, the pore volume is small, the acid strength is low, and the preparation repeatability is poor

Method used

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  • Preparation method of rare-earth modified MCM-48 loaded double-function catalyst
  • Preparation method of rare-earth modified MCM-48 loaded double-function catalyst
  • Preparation method of rare-earth modified MCM-48 loaded double-function catalyst

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Embodiment 1

[0031] Mix 10mL tetraethyl orthosilicate and 40mL deionized water and vibrate for 40min under the assistance of ultrasonic waves, then add 5mL of 4.5mol / L sodium hydroxide solution into the mixed solution, and then introduce 5mL of 0.27mol / L cerium nitrate solution, And oscillating for 60min under the assistance of ultrasonic waves, 10.61g cetyltrimethylammonium bromide was added to the mixed solution, and continued to oscillate for 60min under the assistance of ultrasonic waves, the gel ratio of the mixture was 1.0TEOS:0.65CTAB:0.5NaOH :62H 2 O, the Ce / Si ratio is 0.03. The mixed gel was put into an autogenous pressure stainless steel reactor lined with polytetrafluoroethylene, and statically crystallized at 120 °C for 3 days. The crystallized product was filtered under low pressure, washed with deionized water until the pH was neutral, and dried in a constant temperature oven at 100°C for 10 hours to remove excess water to obtain the original powder of Ce-MCM-48. The raw p...

Embodiment 2

[0036] Mix 10mL tetraethyl orthosilicate and 40mL deionized water and vibrate for 40min under the assistance of ultrasonic waves, then add 5mL of 4.5mol / L sodium hydroxide solution into the mixed solution, and then introduce 5mL of 0.27mol / L cerium nitrate solution, And oscillating for 60min under the assistance of ultrasonic waves, 10.61g cetyltrimethylammonium bromide was added to the mixed solution, and continued to oscillate for 60min under the assistance of ultrasonic waves, the gel ratio of the mixture was 1.0TEOS:0.65CTAB:0.5NaOH :62H 2O, the Ce / Si ratio is 0.03. The mixed gel was put into an autogenous pressure stainless steel reactor lined with polytetrafluoroethylene, and statically crystallized at 120 °C for 3 days. The crystallized product was filtered under low pressure, washed with deionized water until the pH was neutral, and dried in a constant temperature oven at 100°C for 10 hours to remove excess water to obtain the original powder of Ce-MCM-48. The raw po...

Embodiment 3

[0041] Mix 10mL tetraethyl orthosilicate and 40mL deionized water and vibrate for 40min under the assistance of ultrasonic waves, then add 5mL of 4.5mol / L sodium hydroxide solution into the mixed solution, and then introduce 5mL of 0.27mol / L cerium nitrate solution, And oscillating for 60min under the assistance of ultrasonic waves, 10.61g cetyltrimethylammonium bromide was added to the mixed solution, and continued to oscillate for 60min under the assistance of ultrasonic waves, the gel ratio of the mixture was 1.0TEOS:0.65CTAB:0.5NaOH :62H 2 O, the Ce / Si ratio is 0.03. The mixed gel was put into an autogenous pressure stainless steel reactor lined with polytetrafluoroethylene, and statically crystallized at 120 °C for 3 days. The crystallized product was filtered under low pressure, washed with deionized water until the pH was neutral, and dried in a constant temperature oven at 100°C for 10 hours to remove excess water to obtain the original powder of Ce-MCM-48. The raw p...

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Abstract

The invention relates to a preparation method of a rare-earth modified MCM-48 loaded double-function catalyst. The method comprises the following steps of mixing and ultrasonically oscillating tetraethoxysilane ethyl orthosilicate and deionized water, adding the mixture into 4.5 mol / L sodium hydroxide solution, then adding 0.27 mol / L cerous nitrate, ultrasonically oscillating the solution, adding cetyl-trimethyl ammonium bromide, and ultrasonically oscillating the mixed solution to obtain mixture gel with the ratio of 1.0TEOS: 0.65CTAB: 0.5NaOH:62H2O:0.03Ce; after standing and crystallizing, low-pressure filtering, washing and drying the gel to obtain Ce-MCM-48 raw powder, and roasting the raw powder to obtain a catalyst carrier Ce-MCM-48 mesoporous molecular sieve; soaking the powder Ce-MCM-48 mesoporous molecular sieve by using a phosphotungstic acid solution, and drying and roasting the mesoporous molecular sieve to obtain a Ni-HPW / Ce-MCM-48 catalyst precursor. By adopting the preparation method, the difficulties of the prior art after an MCM-48 skeleton is doped into the rare earth, the specific surface area is reduced, the pore canals are blocked by the rare earth in a form of rare-earth oxide, the pore volume is small, the acid strength is low and the like can be solved.

Description

1. Technical field: [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a rare earth modified MCM-48 supported bifunctional catalyst. 2. Background technology: [0002] Since the first report of M41S series mesoporous materials by Mobil Corporation in 1992, this kind of mesoporous materials have attracted widespread attention due to their uniform channels and adjustable pore diameters. Among them, MCM-48 has been widely used in catalysis, separation , adsorption and other fields have great advantages. However, due to the narrow range of the synthetic cubic phase region and the strict requirements on the packing parameters of the surfactant, the synthesis has certain difficulties, and because MCM-48 lacks active centers, its application in catalysis and other fields is also greatly limited. For this reason, people modify the skeleton of pure silicon MCM-48, and replace the silicon atoms in the skeleton with Ti, Al, Cr ...

Claims

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Application Information

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IPC IPC(8): B01J31/18C07C5/27C07C9/16
Inventor 汪颖军所艳华杨美娥崔荧雪张微苑丹丹
Owner NORTHEAST GASOLINEEUM UNIV
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