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Method for preparing methanol by reforming methane and steam through plasma-thermal coupling

A steam reforming and plasma technology, which is applied in oxidation reaction preparation, organic chemistry, bulk chemical production, etc., can solve the problem of high operation investment, equipment investment and equipment maintenance costs, harsh reaction conditions, and corrosive reaction media, etc. problems, to achieve the effect of highly dispersed catalytic activity, cheap raw materials, and mild conditions

Active Publication Date: 2021-12-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] There are many defects and deficiencies in the technologies widely studied at present: industrially adopts two-step method to convert methane into methanol, high temperature and high pressure conditions lead to high operation investment, equipment investment and equipment maintenance costs; in homogeneous catalysis, the catalyst cost is high, and the reaction medium Strong corrosiveness, strict equipment requirements, and difficult product separation
[0028] To sum up, the existing published documents and published patents involve the problems of thermodynamic limitation, low methanol yield or harsh reaction conditions in the one-step production of methanol by steam reforming of methane, and basically do not involve the impact of catalytic materials on the reaction results. Impact

Method used

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  • Method for preparing methanol by reforming methane and steam through plasma-thermal coupling
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  • Method for preparing methanol by reforming methane and steam through plasma-thermal coupling

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Experimental program
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Effect test

Embodiment 1

[0055] Repeat comparative example 2, the copper catalyst (expressed as Cu / SiO 2 ) is filled in the discharge area of ​​the dielectric barrier discharge plasma reactor. The molar ratio of argon, methane, and water vapor is 2:1:3 (the flow rate of argon is 40ml / min, the flow rate of methane is 20ml / min, and the flow rate of water vapor is 60ml / min). The catalyst is 20-40 mesh particles, the loading amount of the active ingredient calculated as the element Cu is 5% by weight, and the calcination temperature of the catalyst is 540°C. The external furnace temperature was set at 200 °C. The discharge parameters are set as: power 7W, frequency 14.5kHz. After 2.5 hours of discharge, the product analysis shows that the conversion rate of methane is 7.0645%, the selectivity of liquid phase products is 67.7349%, and the selectivity of methanol is 51.7905%.

Embodiment 2

[0057] Repeat comparative example 2, the nickel catalyst (expressed as Ni / SiO 2 ) is filled in the discharge area of ​​the dielectric barrier discharge plasma reactor. The molar ratio of argon, methane, and water vapor is 2:1:3 (the flow rate of argon is 40ml / min, the flow rate of methane is 20ml / min, and the flow rate of water vapor is 60ml / min). The catalyst is 20-40 mesh particles, wherein the loading amount of the active ingredient calculated as the element Ni is 5% by weight, and the calcination temperature of the catalyst is 540°C. The temperature of the external heating furnace is set to 200°C. The discharge parameters are set to: power 7W, frequency 14.5kHz. After 2.5 hours of discharge, the product analysis shows that the conversion rate of methane is 6.9371%, the selectivity of liquid phase products is 60.0491%, and the selectivity of methanol is 42.9067%.

Embodiment 3

[0059] Repeat comparative example 2, the zirconium catalyst (expressed as Zr / SiO 2 ) is filled in the discharge area of ​​the dielectric barrier discharge plasma reactor. The molar ratio of argon, methane, and water vapor is 2:1:3 (the flow rate of argon is 40ml / min, the flow rate of methane is 20ml / min, and the flow rate of water vapor is 60ml / min). The catalyst is 20-40 mesh particles, wherein the active ingredient load is 5% (weight) based on the element Zr, and the calcination temperature of the catalyst is 540°C. The external furnace temperature was set at 200 °C. The discharge parameters are set as: power 7W, frequency 14.5kHz. After 2.5 hours of discharge, the product analysis shows that the conversion rate of methane is 6.5505%, the selectivity of liquid phase products is 61.6109%, and the selectivity of methanol is 46.4062%.

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Abstract

The invention relates to a method for preparing methanol by reforming methane and steam through plasma-thermal coupling, and belongs to the technical field of methane resource utilization and plasma chemical synthesis. The active part of the metal supported catalyst is Cu, and a carrier comprises SiO2, Al2O3, ZrO2, CeO2, TiO2, Fe2O3 and a zeolite molecular sieve. The weight percentage of the active part Cu in the catalyst is 1%-10%. The discharge reaction zone is maintained at 170 DEG C and 0.1 MPa, the ratio of methane to water vapor is 1: 4, and the selectivity of methanol can reach 58%. The method is mild in condition, the used catalyst is highly dispersed and stable in catalytic activity, the method belongs to a one-step direct synthesis process, the method is simple, raw materials are cheap, and pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of methane resource utilization and plasma chemical synthesis, and relates to a method suitable for plasma-catalyzed steam reforming of methane to produce methanol, a metal-loaded catalyst and a preparation method thereof. Background technique [0002] Methane, the main component of natural gas, is abundant in reserves and is an important carbon resource. At the same time, methane is also a greenhouse gas. Methanol is a liquid at normal temperature and pressure, which is convenient for storage and transportation. It is an important chemical raw material and can be used to produce high value-added chemical products such as olefins, aromatics, and gasoline additive methyl tert-butyl ether. Therefore, the conversion of methane to methanol is of great significance. [0003] The industry mainly adopts two-step method to convert methane into methanol. In the first step, methane and H 2 O reforming reaction to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/48C07C31/04
CPCC07C29/48C07C31/04Y02P20/52
Inventor 易颜辉郝英姿
Owner DALIAN UNIV OF TECH