Slurry bed Cu-based CO hydrogenation CH4 catalyst, preparation method and application

A catalyst and slurry bed technology, which is applied in the chemical industry, can solve problems such as complex structure, small heat capacity, and difficult heat transfer, and achieve the effects of simple preparation process, good stability, and high CH4 selectivity

Active Publication Date: 2019-03-26
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of the reactor is high, the structure is very complex, and the recovery rate of heat energy is often relatively low. Now, more and more adiabatic bed reactors are used to dilute the inlet raw material gas with part of the product to control the concentration of CO and to use it to The reaction is controlled within a wide temperature range, which can improve the recovery rate of high-grade steam, and the heat energy utilization rate is also high (CN201010173181, US4298694, US4205961), but in the industrial process of multi-stage reactions in series, in the first few stages , the CO concentration in the raw material gas is still high, the overall heat capacity of the gas is small, heat transfer is difficult, and the catalyst is easy to sinter, which requires the catalyst to have good heat resistance and high thermal stability. However, the common problem of current catalysts is that the heat resistance temperature is low , poor thermal stability, which is why domestic coal-to-natural gas has not yet been put into large-scale production and operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 19.8 g of aluminum isopropoxide into 90 mL of deionized water, hydrolyze at 85 °C for 1.5 h, and then add 1 mol / L of dilute HNO 3 10 mL, adjust the temperature of the water bath to 95 ℃, continue to heat and hydrolyze, add 5% Co(NO 3 ) 2 Cu(NO 3 ) 2 and Zn(NO 3 ) 2 The aqueous solution was heated, stirred and refluxed for 6 h to obtain a sol, and the sol was aged at room temperature for 10 days to obtain a gel. The gel was dispersed in 300 mL of liquid paraffin and sheared and emulsified with a high-shear emulsifier. 2 Under the atmosphere, the temperature was programmed from 60 °C to 300 °C at a rate of 1 °C / min and kept for 8 h to obtain the slurry catalyst. The catalyst was placed in a slurry bed reactor and 2 / CO=2, 250°C, 4 MPa reaction conditions for activity evaluation, the results: CO conversion (C-mol %) was 43.8; CH 4 The selectivity (C-mol %) was 94.1.

Embodiment 2

[0032] Weigh 19.8 g of aluminum isopropoxide, dissolve it in an appropriate amount of deionized water, and hydrolyze it in a water bath at 85 °C for 1.5 h to obtain a boehmite precipitate; then add dilute HNO 3 solution, adjust the water bath temperature to 95 ℃, add 10% Co(NO 3 ) 2 Cu(NO 3 ) 2 and Zn(NO 3 ) 2 The aqueous solution was heated, stirred and refluxed for 8 h to obtain a sol, and the sol was aged at room temperature for 10 days to obtain a gel. The gel was dispersed in 300 mL of liquid paraffin and emulsified with a high-shear emulsifier. 2 Under the atmosphere, the temperature was programmed from 60 °C to 300 °C at a rate of 1 °C / min and kept for 8 h to obtain the slurry catalyst. The catalyst was placed in a slurry bed reactor and 2 / CO=2, 250 ℃, 4 MPa reaction conditions for activity evaluation, the results: CO conversion rate (C-mol %) was 73.4; CH 4 The selectivity (C-mol %) was 94.2.

Embodiment 3

[0034] Weigh 9.9 g of aluminum isopropoxide, dissolve it in an appropriate amount of deionized water, and hydrolyze it in a water bath at 85 °C for 0.5 h to obtain a boehmite precipitate; then add 1 mol / L dilute HNO 3 10 mL, adjust the water bath temperature to 95 ℃, add dissolved 10 % Ni(NO 3 ) 2 Cu(NO 3 ) 2 and Zn(NO 3 ) 2The aqueous solution was heated, stirred and refluxed for 10 h to obtain a sol, and the sol was aged at room temperature for 10 days to obtain a gel. The gel was dispersed in 300 mL of liquid paraffin and sheared and emulsified with a high-shear emulsifier. 2 Under the atmosphere, the temperature was programmed from 60 °C to 300 °C at a rate of 1 °C / min and kept for 8 h to obtain the slurry catalyst. The catalyst was placed in a slurry bed reactor and 2 / CO=2, 250 ℃, 4 MPa reaction conditions for activity evaluation, the results: CO conversion (C-mol %) was 76.3; CH 4 The selectivity (C-mol %) was 90.3.

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Abstract

The invention discloses a Cu-based catalyst for preparing CH4 through Co hydrogenation on a slurry bed, and belongs to the technical field of chemical engineering. The catalyst is composed of X-Cu / Zn / Al, X and Cu are active components, Zn is an assistant, Al is a carrier, and the mole percent of the components is shown in the formula: Cu / Zn / Al=1.0-4.0:0.5-2:0.4-1.5, and the X accounts for 1-20% according to the mass fraction. According to the method, AlOOH is preferably prepared, then the assistant and the active components are added, finally, an obtained catalyst precursor is subjected to liquid phase heat treatment in an inert medium, and then the slurry catalyst is obtained. The prepared slurry catalyst is applicable to preparing of CH4 through CO hydrogenation on a slurry bed reactor, the high CO conversion rate and CH4 selectivity are displayed on the slurry bed reactor, catalyst raw materials are easy to obtain, and the preparing method is simple.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a method for preparing CH by hydrogenation of Cu-based CO in a slurry bed reactor. 4 Catalyst preparation methods and applications. technical background [0002] Natural gas is a safe, efficient and ideal clean energy, the main component is alkanes, among which CH 4 The vast majority, and a small amount of ethane, propane, and butane. In recent years, with the rapid development of China's urbanization and industrialization, the gap in domestic natural gas supply is increasing year by year, and the dependence on foreign countries is showing a trend of rapid increase. [0003] According to relevant data forecasts, by 2020, the domestic natural gas gap will reach 100 billion cubic meters. In 2011, China's dependence on foreign natural gas reached 24%, compared with 12.8% in 2010, showing a double growth trend. This has objectively increased the demand for un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80C07C1/04C07C9/04
CPCB01J23/80C07C1/043C07C1/0435C07C1/044C07C2523/80C07C9/04
Inventor 刘勇军黄伟邓旋
Owner TAIYUAN UNIV OF TECH
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