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Nano-methane oxidation coupling catalyst, and preparation method and application thereof

An oxidative coupling and catalyst technology, which is applied to the nanometer methane oxidative coupling catalyst and its preparation and application fields, can solve the problems of low hydrocarbon selectivity, and achieve the effects of high selectivity, high specific surface and good industrial application value.

Active Publication Date: 2019-04-23
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103350002A discloses an oxide nanorod catalyst that catalyzes the oxidative coupling of methane to produce ethane and ethylene. When the reaction temperature is as low as 475°C, the conversion rate of methane can reach 30%, but C 2 + Hydrocarbon selectivity is low

Method used

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  • Nano-methane oxidation coupling catalyst, and preparation method and application thereof
  • Nano-methane oxidation coupling catalyst, and preparation method and application thereof
  • Nano-methane oxidation coupling catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve a certain amount of glucose and acrylic acid in deionized water, stir and mix evenly, add lanthanum nitrate and calcium nitrate, stir to form a transparent solution, the molar ratio of various additives is glucose:acrylic acid:lanthanum nitrate:calcium nitrate:water=0.1:0.2 : 0.9: 0.1: 300, adjust the pH value of the above product to 9.0 with ammonia water under stirring, place the obtained gel in an ultrasonic device, and perform ultrasonic oscillation for 180 minutes at 25°C, ultrasonic frequency 40kHz, and ultrasonic power 100W. Then transfer it to a crystallization kettle, and crystallize at 140°C for 240 hours at a static state; after the crystallization is completed and cooled to room temperature, the solid product is separated by filtration, washed with deionized water and methanol successively to remove impurity ions and organic solvents, After drying, it was calcined at 500°C for 12 hours in a nitrogen atmosphere, and then calcined at 500°C for 6 hours ...

Embodiment 2

[0031]Dissolve a certain amount of glucose and acrylic acid in deionized water, stir and mix evenly, add lanthanum nitrate and calcium nitrate, stir to form a transparent solution, the molar ratio of various additives is glucose:acrylic acid:lanthanum nitrate:strontium nitrate:water=0.2:0.4 : 0.5: 0.5: 200, adjust the pH value of the above product to 9.5 with ammonia water under stirring, place the obtained gel in an ultrasonic device, and perform ultrasonic oscillation for 90 minutes at 40°C, ultrasonic frequency 40kHz, and ultrasonic power 200W. Then transfer to the crystallization kettle, and crystallize at static state, 150°C, for 200 hours; after the crystallization is completed and cooled to room temperature, the solid product is separated by filtration, washed with deionized water and methanol successively to remove impurity ions and organic solvents, After drying, it was calcined at 600°C for 6 hours in a nitrogen atmosphere, and then calcined at 500°C for 6 hours in an...

Embodiment 3

[0034] Dissolve a certain amount of fructose and crotonic acid in deionized water, stir and mix evenly, add lanthanum acetate and barium nitrate, stir to form a transparent solution, the molar ratio of various additives is fructose: crotonic acid: lanthanum acetate: barium nitrate: water = 0.5: 1.0: 0.95: 0.05: 150, adjust the pH value of the above product to 10.0 with ammonia water under stirring, place the obtained gel in an ultrasonic device, and perform ultrasonication at 50°C, ultrasonic frequency 50kHz, and ultrasonic power 500W Shake for 60 minutes, then transfer to a crystallization kettle, and crystallize at 160°C for 150 hours under dynamic conditions; after the crystallization is completed and cooled to room temperature, the solid product is filtered and separated, and washed with deionized water and ethanol successively to remove impurity ions and organic solvent, dried and calcined at 600°C for 6 hours in an argon atmosphere, and then calcined at 600°C for 4 hours ...

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Abstract

The invention discloses a nano-methane oxidation coupling catalyst. The nano-methane oxidation coupling catalyst takes lanthanum oxide as an active component; an oxide assistant MOx is added on the basis of the active component; and the metal in the active component, namely, the La2O3, and the metal in the assistant MOx are in the molar ratio of 1:1 to 200:1. According to the nano-methane oxidation coupling catalyst, flower-like lanthanum oxide-based nano-microspheres are prepared by utilizing a hydrothermal crystallization method; the characteristic of high specific surface area is realized;the diffusion of reaction species on a surface is benefited; deep oxidation is effectively inhibited; moreover, the utilization rate of the active component is high; the reaction temperature is wide;and the stability is high.

Description

technical field [0001] The invention relates to a nano methane oxidative coupling catalyst, a preparation method and application thereof. Background technique [0002] Natural gas to ethylene technology includes two routes of indirect conversion and direct conversion. Indirect conversion includes natural gas through methanol to ethylene technology (MTO), Fischer-Tropsch synthesis route to ethylene technology (FTO), etc.; direct conversion includes methane anaerobic dehydrogenation technology (MDA), methane oxidative coupling to ethylene technology (OCM), etc. . The indirect methane conversion process is relatively complicated. It is necessary to first convert methane into synthesis gas at high temperature, and then synthesize the synthesis gas into ethylene in one or two steps. From an energy point of view, indirect conversion needs to break all the C-H bonds that should have been retained in the product to generate synthesis gas, and then recombine under the action of a c...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/08B01J35/10C07C2/84C07C9/06C07C11/04
CPCC07C2/84B01J23/002B01J23/10C07C2523/10B01J2523/00B01J35/51B01J35/61B01J35/60B01J2523/23B01J2523/3706B01J2523/48B01J2523/24B01J2523/25B01J2523/3712C07C9/06C07C11/04Y02P20/52
Inventor 李德宝林明桂冯茹郭荷芹肖勇李莉贾丽涛侯博
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI