A kind of composite metal oxide solid base catalyst, preparation method and application

A solid base catalyst and composite metal technology, applied in the field of composite metal oxide solid base catalyst and preparation, can solve the problems of difficult separation of catalyst and product, environmental pollution, etc., achieve excellent oxygen storage/release capacity, reduce pollution degree, The effect of improving catalytic activity

Active Publication Date: 2022-06-28
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the production process, KOH is easy to corrode the device, and the catalyst and the product are not easy to separate after the reaction, and the salt and alkaline wastewater generated after the post-treatment are likely to cause serious pollution to the environment.

Method used

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  • A kind of composite metal oxide solid base catalyst, preparation method and application
  • A kind of composite metal oxide solid base catalyst, preparation method and application
  • A kind of composite metal oxide solid base catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Solid base catalyst K 2 O / CeO 2 @ZrO 2 Preparation of (KCZ)

[0043] (1) The composite metal oxide solid base catalyst K 2 O / CeO 2 @ZrO 2 The preparation steps of (KCZ) are as follows:

[0044] a, molar ratio n(Ce):n(Zr)=0.05:1, weigh 12g ZrOCl 2 ·8H 2 O and 0.8gCe (NO 3 ) 3 ·6H 2 The mixed solution was prepared in 100ml of water and transferred to a three-necked flask. Under the condition of a water bath at 30°C, the mixture was continuously stirred and slowly dripped with ammonia water, adjusted to pH 11, and continued to be stirred for 8h to fully react. After ultrasonication, aging, suction filtration and drying, rinse Cl with distilled water - , to obtain the precursor;

[0045] b. Put the prepared carrier precursor in 0.5mol / L KNO under the condition of water bath at 75℃ 3 Immerse in the solution for 12h, filter, dry, and calcinate at 700°C for 6h to obtain a solid base catalyst KCZ. KCZ is measured by ICP-AES. 2 The O loading was 5% (wt.%...

Embodiment 2

[0052] Example 2: Polypropylene glycol synthesis

[0053] The reactants glycerol, propylene oxide and catalyst were placed in a high-pressure reaction kettle. Before the reaction, a sufficient amount of nitrogen was introduced to replace the air in the kettle, and the reaction was polymerized for 6h under the conditions of an initial pressure of 2MPa, a temperature of 180°C, and a rotation speed of 350r / min. Wherein the raw material mass ratio m (glycerol): m (propylene oxide)=0.1:1, respectively use the catalyst prepared by embodiment 1, comparative example 1-2, catalyze the synthesis of polypropylene glycol, the usage amount of the catalyst is m ( catalyst): m (propylene oxide) = 0.06:1.

[0054] Filtration: The reacted product is taken out from the kettle and separated by suction filtration. In the first step, a double-layer medium-speed qualitative filter paper is used for filtration, and the pore size of the filter paper is 30-50 μm; in the second step, a double-layer sl...

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Abstract

The invention discloses a composite metal oxide solid base catalyst, a preparation method and an application thereof. The solid base catalyst includes t-ZrO as a carrier 2 And the active ingredient; the active ingredient is present in ZrO 2 Alkali metal oxides K capable of providing Bronsted basic sites in octahedral vacancies 2 O and ZrO 2 Composite solid solution Ce capable of providing oxygen vacancies 2 Zr 2 o 7.04 composition. The present invention is based on ZrO 2 Doped CeO 2 , capable of interacting with ZrO 2 Form a solid solution and cause the formation of oxygen vacancies, so that the solid solution has excellent oxygen storage / release capacity, and further form O2- / O- / O2-on the surface of the catalyst to increase the basic sites, enhance the basicity, and improve the catalytic activity .

Description

technical field [0001] The invention relates to a catalyst for synthesizing polypropylene glycol, in particular to a composite metal oxide solid base catalyst, a preparation method and an application. Background technique [0002] Polypropylene glycol (PPG) is a colorless to pale yellow viscous liquid, non-volatile and non-corrosive. Polypropylene glycol is mainly produced by reacting glycerol as a starting agent with epoxide (ethylene oxide or propylene oxide). By changing the conditions such as the feed ratio of starting agent and epoxide, products with different molecular weights can be produced. Polypropylene glycol is widely used and is an important raw material for synthesizing polyurethane; polypropylene glycol is used as emollient, softener, and lubricant in cosmetics; in perfume, resin, rubber, latex and other industries, polypropylene glycol is used as lubricant, antistatic It can also be used as a release agent, a solubilizer, and an intermediate for esterificati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28
CPCC08G65/269C08G65/2609
Inventor 顾正桂汪灿汪凯军李硕
Owner NANJING NORMAL UNIVERSITY
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