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Application of a cerium-based catalyst in the direct conversion of carbon dioxide and methanol to produce dimethyl carbonate

A cerium-based catalyst and dimethyl carbonate technology, which is applied in the direction of carbon dioxide or inorganic carbonate preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of expensive dehydrating agents and environmental protection, and achieve Excellent mechanical stability and thermal stability, high specific surface area, and the effect of improving catalytic efficiency

Active Publication Date: 2022-04-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, dehydrating agents are usually expensive and not environmentally friendly, therefore, it is very worthwhile and desirable to develop a cost-effective, less toxic and dehydrating agent-free production process for the synthesis reaction of dimethyl carbonate in the concept of "green chemistry"

Method used

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  • Application of a cerium-based catalyst in the direct conversion of carbon dioxide and methanol to produce dimethyl carbonate
  • Application of a cerium-based catalyst in the direct conversion of carbon dioxide and methanol to produce dimethyl carbonate
  • Application of a cerium-based catalyst in the direct conversion of carbon dioxide and methanol to produce dimethyl carbonate

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Experimental program
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Embodiment 1

[0032] 36 mmoles of analytically pure (NH 4 ) 2 Ce(NO 3 ) 6 with 4 mmol analytically pure Ti(SO 4 ) 2Dissolve in deionized water, introduce the mixed solution into a 1000 ml beaker, dissolve 120 mmol of urea in 200 ml of deionized water and keep stirring. The solution system was heated to 90° C. for 5 hours, filtered and the precipitate was collected. The precipitate was washed with 2000 ml of deionized water and 300 ml of absolute ethanol. Ti 0.1 Ce 0.9 o 2 Particles, Ti 0.1 Ce 0.9 o 2 The X-ray diffraction pattern of figure 1 , see the transmission electron micrograph figure 2 c), see particle size distribution chart figure 2 f). Will get Ti 0.1 Ce 0.9 o 2 The powder was ground with deionized water to obtain a slurry coated on a honeycomb cordierite ceramic carrier (64 cells / cm -2 , hole diameter 10 mm, hole depth 25 mm), the loading of the coating is about 0.5 grams. Finally, the coated catalyst was dried at 80°C for more than 12 hours and calcined in ...

Embodiment 2

[0034] Except that the feeding ratio is changed into 38 millimoles of analytically pure ammonium cerium nitrate and 2 millimoles of analytically pure titanium sulfate, other conditions are the same as in Example 1. Ti 0.05 Ce 0.95 o 2 The X-ray diffraction pattern of figure 1 , see the transmission electron micrograph figure 2 b). After gas chromatograph analysis, the test results are shown in image 3 a), the conversion rate of methanol is 21.6%, and the selectivity of dimethyl carbonate is 80.5%.

Embodiment 3

[0036] Except that the feeding ratio is changed into 34 mmoles of analytically pure ammonium cerium nitrate, and 6 mmoles of analytically pure titanium sulfate, other conditions are the same as in Example 1, Ti 0.15 Ce 0.85 o 2 The X-ray diffraction pattern of figure 1 , see the transmission electron micrograph figure 2 d). After gas chromatograph analysis, the test results are shown in image 3 a), the conversion rate of methanol is 22.1%, and the selectivity of dimethyl carbonate is 76.2%.

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Abstract

The invention provides an application of a cerium-based catalyst in the direct conversion of carbon dioxide and methanol to produce dimethyl carbonate. The active component of the cerium-based catalyst is: M x Ce 1‑x o y (0≤x≤0.2; 1.9≤y≤2), M is a metal element, wherein M=Mn, Cu, Ti, Bi, Zr, Fe, Al, Mg, etc. The invention provides a cerium-based nanocomposite catalyst material used in the reaction of preparing dimethyl carbonate, and the method is simple to operate and has universal applicability. Compared with the existing particle catalyst technology, the catalyst has higher specific surface area, lower pressure drop, excellent mechanical stability and thermal stability, and is especially suitable for continuous reaction operation. Under the condition of 140 degrees centigrade without using any dehydrating agent, the conversion rate of methanol can reach 24.3%, and the selectivity of dimethyl carbonate can reach 78.6%.

Description

technical field [0001] The invention belongs to the technical field of nanometer catalytic materials, and in particular relates to the application of a cerium-based catalyst in the direct conversion of carbon dioxide and methanol into dimethyl carbonate. Background technique [0002] Dimethyl carbonate (DMC) is regarded as an environmentally friendly solvent and reagent because of its low toxicity, high biodegradability and special reactivity. Dimethyl carbonate has proven to be an effective replacement for halogen and sulfate reagents in many important chemical reactions such as carbonation and hydrochlorination. DMC has traditionally been synthesized by methanol phosphation, methanol oxidative carbonation, and esterification, leaving serious environmental concerns. In this regard, the direct synthesis of dimethyl carbonate from the reaction of methanol with carbon dioxide has attracted extensive attention. However, despite the green nature of the reaction, CO 2 The high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J23/18B01J35/10C07C68/04C07C69/96
CPCB01J23/10B01J23/18B01J23/002C07C68/04B01J2523/00B01J35/61C07C69/96B01J2523/22B01J2523/31B01J2523/3712B01J2523/41B01J2523/47B01J2523/54Y02P20/141
Inventor 李杲郑凯李志敏
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI