Monolithic catalyst for preparation of dimethyl carbonate by direct synthesis process, preparation method and direct synthesis method of dimethyl carbonate

A monolithic catalyst, dimethyl carbonate technology, applied in the direction of chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., to achieve process strengthening, improved catalytic performance, excellent catalytic performance and stability Effect

Active Publication Date: 2020-03-17
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention intends to address the shortcomings of the existing granular catalysts for the direct synthesis method to prepare dimethyl carbonate, and provides a method for the direct synthesis method Monolithic catalyst for the preparation of dimethyl carbonate for the direct synthesis of dimethyl carbonate in a continuous fixed-bed reactor

Method used

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  • Monolithic catalyst for preparation of dimethyl carbonate by direct synthesis process, preparation method and direct synthesis method of dimethyl carbonate
  • Monolithic catalyst for preparation of dimethyl carbonate by direct synthesis process, preparation method and direct synthesis method of dimethyl carbonate
  • Monolithic catalyst for preparation of dimethyl carbonate by direct synthesis process, preparation method and direct synthesis method of dimethyl carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Preparation of Ce with Lanthanum Oxide Doping 5% 0.95 La 0.05 o δ -Al 2 o 3 Monolithic catalyst (molar ratio of ceria to lanthanum oxide is 0.95:0.05). Methods as below:

[0025] Weigh 15.000g (NH 4 ) 2 Ce(NO 3 ) 6 and 0.624g La(NO 3 )·6H 2 O, stirring and dissolving in an appropriate amount of deionized water to obtain a nitrate precursor mixed solution, stirring and dissolving 70g of urea in an appropriate amount of deionized water, the total amount of deionized water used in the two dissolution processes is 500mL. The nitrate precursor mixture and the urea solution were successively transferred to a 1000mL three-necked flask, heated in a water bath to 80-100°C (preferably 90°C) under mechanical stirring conditions, and kept for 4-6h (preferably 5h), until the When the pH reaches 8-9, cool naturally to room temperature after the reaction is complete, filter and wash the reaction product, then mash the obtained filter cake, add deionized water to make an emuls...

Embodiment 2

[0029] Lanthanum oxide doped with 10 wt% Ce 0.90 La 0.10 o δ -Al 2 o 3 The preparation process of the monolithic catalyst (referred to as Cat 2) is the same as that of Example 1, except that the amounts of each precursor and polyethylene glycol are different, and the specific amounts are shown in Table 1.

Embodiment 3

[0031] Lanthanum oxide doped with 15 wt% Ce 0.85 La 0.15 o δ -Al 2 o 3 The preparation process of the monolithic catalyst (referred to as Cat 3) is the same as that of Example 1, except that the amounts of each precursor and polyethylene glycol are different, and the specific amounts are shown in Table 1.

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Abstract

The invention discloses a monolithic catalyst for preparation of dimethyl carbonate by direct synthesis process, a preparation method and a direct synthesis method of dimethyl carbonate. The catalystis composed of a cerium-based composite oxide coating and a cordierite honeycomb ceramic matrix, ceric ammonium nitrate and lanthanum nitrate are used as the raw materials, urea is adopted as the precipitant, and coprecipitation method is utilized to prepare a composite material, then the obtained composite material and alumina balls are mixed and roasted to form a composite oxide powder catalyst,and finally the prepared composite oxide powder catalyst is coated on the cordierite honeycomb ceramic matrix to form the needed monolithic catalyst. The direct synthesis method of dimethyl carbonateincludes: placing the monolithic catalyst at a steel pipe center of a continuous fixed bed reactor, and then pumping the liquid CH3OH to a preheater through a high-pressure constant-flow pump in a heating environment for gasification and premixing with CO2; controlling the mole ratio of CH3OH to CO2 in the reaction gas at 1-3, and carrying out reaction for 2-6h to obtain dimethyl carbonate. The invention provides the novel catalyst and the preparation method thereof, and the production efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of nanometer metal catalyst preparation, in particular to a catalyst for preparing dimethyl carbonate by a direct synthesis method, a preparation method and the direct synthesis method of dimethyl carbonate. Background technique [0002] With the development of society, the emission of carbon dioxide is gradually increasing. Carbon dioxide is the main gas that causes the greenhouse effect, but it is also a potential carbon source at the same time. Therefore, the greenhouse gas CO 2 As an effective carbon resource, the fixation and resource utilization are of great significance to all aspects of mitigating the carbon resource crisis and environmental protection. [0003] Dimethyl carbonate (CH 3 OCOOCH 3 , abbreviated as DMC) is a widely used green chemical raw material with very active chemical properties and can participate in various chemical reactions such as methylation, carboxylation, and methoxylati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10B01J35/04C07C68/04C07C69/96
CPCB01J23/002B01J23/10B01J35/04B01J35/1004C07C68/04B01J2523/00B01J2523/31B01J2523/3706B01J2523/3712C07C69/96Y02P20/141
Inventor 陈永东李月唐强王健礼刘锐王俊杰袁亮朱金权许正伟
Owner SOUTHWEST PETROLEUM UNIV
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