Lanthanum oxycarbonate catalyst as well as preparation method and application thereof

A lanthanum oxycarbonate and catalyst technology, applied in the field of catalysts, can solve the problems of reduced C2+ hydrocarbon selectivity, affecting the yield of the target product, affecting the life of the catalyst, etc., and achieves the effects of high selectivity, stable structure and performance, and good catalytic performance.

Pending Publication Date: 2021-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high temperature will easily lead to deep oxidation of methane and C2+ hydrocarbons, which will lead to a decrease in the selectivity of C2+ hydrocarbons and affect the yield of the target product; at the same time, high temperature will usually cause problems such as sintering, loss and carbon deposition of active components, thus affecting catalyst life.

Method used

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  • Lanthanum oxycarbonate catalyst as well as preparation method and application thereof
  • Lanthanum oxycarbonate catalyst as well as preparation method and application thereof
  • Lanthanum oxycarbonate catalyst as well as preparation method and application thereof

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preparation example Construction

[0025] In a second aspect, the present invention provides a method for preparing a lanthanum oxycarbonate catalyst, the method comprising: under alkaline conditions, carrying out a hydrothermal reaction with a mixture of a compound containing lanthanum, an optional alcohol and water, and then dissolving the water The solid material after thermal reaction is dried and calcined in sequence to obtain the lanthanum oxycarbonate catalyst.

[0026] According to the present invention, the pH value of the alkaline condition can be selected within a wide range, preferably, the pH value of the alkaline condition is 9-12, for example, it can be 9, 9.5, 10, 10.5, 11 , 11.5, 12, more preferably 9.5-11.5.

[0027] Wherein, the alkaline conditions can be obtained through conventional methods, for example, providing alkaline substances, such as lye, into the system. The alkaline substance can be sodium hydroxide, sodium carbonate, etc., preferably sodium hydroxide. According to a preferred ...

Embodiment approach

[0032] According to a preferred embodiment of the present invention, the preparation method of the mixed solution comprises: under the condition of stirring, dissolving the lanthanum compound in the aqueous alcohol solution, and then adding an alkaline substance therein to provide the alkaline condition , and continue to stir until solids are precipitated, thereby obtaining the mixed solution.

[0033] According to the present invention, in order to further improve the structural uniformity of the lanthanum oxycarbonate, preferably, before performing the hydrothermal synthesis reaction, ultrasonic treatment of the mixed solution is also included. Wherein, the conditions of the ultrasound can be selected within a wide range, preferably, the conditions of the ultrasound include: the frequency is 35-120kHz, for example, it can be 35kHz, 40kHz, 45kHz, 50kHz, 55kHz, 60kHz, 65kHz, 70kHz, 75kHz, 80kHz, 85kHz, 90kHz, 95kHz, 100kHz, 110kHz, 120kHz, preferably 45-100kHz; time is 20-100m...

Embodiment 1

[0070] This example is used to illustrate methane oxidative coupling catalyst and its preparation method

[0071] Dissolve lanthanum nitrate hexahydrate in 150g of deionized water and ethanol mixed solution (the weight ratio of water and ethanol is 1:0.1, the amount of lanthanum nitrate hexahydrate makes the amount of lanthanum element 1g), after stirring and dissolving, add 10wt% The sodium hydroxide solution adjusted the pH value of the solution to 10.5, continued to stir until solids were precipitated, transferred the mixed solution to an ultrasonic machine for processing, the frequency was 45kHz, ultrasonic 30min, then adjusted the ultrasonic frequency to 80kHz, ultrasonic 10min, and then adjusted the ultrasonic The frequency is 100KHz, ultrasonic 10min. After sonication, transfer to a stainless steel hydrothermal kettle lined with polytetrafluoroethylene, keep at 160°C for 12h, then centrifuge at 7800rpm for 40min, wash three times with water and once with ethanol, and ob...

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Abstract

The invention relates to the field of catalysts, and discloses a lanthanum oxycarbonate catalyst as well as a preparation method and application thereof. The lanthanum oxycarbonate catalyst is of a rod-like nano structure. The preparation method of the lanthanum oxycarbonate catalyst comprises the following steps of: performing a hydrothermal reaction on a mixed solution of a lanthanum-containing compound, optional alcohol and water under an alkaline condition, and then sequentially drying and roasting a solid material obtained after the hydrothermal reaction to obtain the lanthanum oxycarbonate catalyst. The lanthanum oxycarbonate catalyst provided by the invention can be used for efficiently carrying out methane oxidative coupling reaction at a relatively low temperature.

Description

technical field [0001] The present invention relates to the field of catalysts, in particular to a lanthanum oxycarbonate catalyst, a preparation method of a lanthanum oxycarbonate catalyst, the lanthanum oxycarbonate catalyst prepared by the preparation method, and the lanthanum oxycarbonate catalyst used in methane oxidative coupling reaction and a method for preparing carbon two and above hydrocarbons from methane. Background technique [0002] Ethylene is one of the largest chemical products in the world. The ethylene industry is the core of the petrochemical industry. Ethylene products account for more than 75% of petrochemical products and occupy an important position in the national economy. The world has taken ethylene production as one of the important symbols to measure the development level of a country's petrochemical industry. In recent years, the discovery and exploitation of shale gas has brought a revolutionary impetus to the development and utilization of n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232B01J35/10B01J37/10B01J37/34C07C2/84C07C9/06C07C11/04C01F17/247
CPCB01J27/232B01J35/023B01J35/1014B01J35/1019B01J35/1038B01J35/1042B01J35/1047B01J35/1061B01J37/10B01J37/343C07C2/84C01F17/247C07C2527/232C01P2002/72C01P2004/03C01P2004/16C01P2004/64C07C9/06C07C11/04Y02P20/52
Inventor 武洁花邵芸薛伟冯英杰赵清锐张明森刘东兵
Owner CHINA PETROLEUM & CHEM CORP
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