Wide-temperature sulfur-tolerance shift catalyst and preparation method therefor

A sulfur-resistant conversion and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve thermal stability and small specific surface area, small specific surface area , anti-hydration and poor thermal stability, etc., to achieve the effect of improving anti-hydration performance, large specific surface area, and improving low-temperature activity

Active Publication Date: 2015-10-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the one hand, the present invention solves the defects of poor anti-hydration and thermal stability and small specific surface area existing in the shift catalyst in the prior art; Thermal stability and small specific surface area, and then provide a method for preparing wide-temperature sulfur-tolerant shift catalysts using hydrotalcite as a precursor

Method used

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  • Wide-temperature sulfur-tolerance shift catalyst and preparation method therefor
  • Wide-temperature sulfur-tolerance shift catalyst and preparation method therefor
  • Wide-temperature sulfur-tolerance shift catalyst and preparation method therefor

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Embodiment 1

[0035] The preparation method of the wide-temperature sulfur-resistant shift catalyst described in this embodiment comprises the following steps:

[0036] (1) Mix 6.4g NaOH and 3.18g anhydrous NaOH 2 CO 3 Dissolve in 250ml deionized water, stir for 20min and then pour into a three-necked flask to continue stirring for 1h to obtain a precipitant solution; weigh 15.3846g Mg(NO 3 ) 2 ·6H 2 O and 5.6269g Al(NO 3 ) 3 9H 2 O, and dissolved in 250ml deionized water, then ultrasonically dispersed for 20min to obtain a mixed solution of magnesium salt and aluminum salt;

[0037] (2) Use a peristaltic pump to slowly drop the mixed solution of magnesium salt and aluminum salt into the precipitant solution at a rate of 6ml / min and stir vigorously, adjust the pH of the reaction system to about 10 during the dropwise addition, and wait for the dropwise addition After the completion, the temperature was raised to 90°C, and the stirring reaction was continued for 2 hours. After the rea...

Embodiment 2

[0043] The preparation method of the wide-temperature sulfur-resistant shift catalyst described in this embodiment comprises the following steps:

[0044] (1) Mix 6.4g NaOH and 1.9875g anhydrous NaOH 2 CO 3 Dissolve in 250ml deionized water, stir for 20min and then pour into a three-necked flask to continue stirring for 1h to obtain a precipitant solution; weigh 14.4231g Mg(NO 3 ) 2 ·6H 2 O and 7.0331g Al(NO 3 ) 3 9H 2 O and dissolved in 250ml deionized water, and then ultrasonically dispersed for 20min to obtain a mixed solution of magnesium salt and aluminum salt;

[0045] (2) Use a peristaltic pump to slowly drop the mixed solution of magnesium salt and aluminum salt into the precipitant solution at a rate of 6ml / min and stir vigorously, adjust the pH of the reaction system to about 9 during the dropwise addition, and wait for the dropwise addition After the completion, the temperature was raised to 80°C, and the stirring reaction was continued for 2 hours. After the...

Embodiment 3

[0050] The preparation method of the wide-temperature sulfur-resistant shift catalyst described in this embodiment comprises the following steps:

[0051] (1) Mix 6.4gNaOH and 2.65g anhydrous NaOH 2 CO 3 Dissolve in 250ml deionized water, stir for 20min and then pour into a three-necked flask to continue stirring for 1h to obtain a precipitant solution; weigh 12.8205gMg(NO 3 ) 2 ·6H 2 O and 9.3783g Al(NO 3 ) 3 9H 2 O and dissolved in 250ml deionized water, and then ultrasonically dispersed for 20min to obtain a mixed solution of magnesium salt and aluminum salt;

[0052] (2) Use a peristaltic pump to slowly drop the mixed solution of magnesium salt and aluminum salt into the precipitant solution at a rate of 6ml / min and stir vigorously, adjust the pH of the reaction system to about 11 during the dropwise addition, and wait for the dropwise addition After completion, raise the temperature to 80°C, continue to stir for 2 hours, let stand for 24 hours after the reaction is...

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Abstract

The invention provides a wide-temperature sulfur-tolerance shift catalyst and a preparation method therefor. The shift catalyst comprises a carrier and an active component, wherein the carrier is a roasted product of hydrotalcite, and the active component is cobalt and molybdenum. According to the wide-temperature sulfur-tolerance shift catalyst and the preparation method therefor, disclosed by the invention, the roasted product of magnesium aluminum hydrotalcite is used as the carrier for preparing the shift catalyst for the first time, so that the prepared shift catalyst has high hydrability resistance, high heat stability, and large specific surface area; compared with the shift catalyst in the prior art, the shift catalyst disclosed by the invention has better catalytic activity; even under the circumstance of low load amount of the active component, the shift catalyst disclosed by the invention is still high in catalytic activity for a water-gas shift reaction, and the conversion rate of CO can reach 87.62%.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a method for preparing a wide-temperature sulfur-resistant shift catalyst by using magnesium aluminum hydrotalcite as a precursor, and belongs to the field of preparation of water-gas shift catalysts. Background technique [0002] Water gas shift (CO+H 2 O=CO 2 +H 2 , Water Gas Shift, referred to as WGS) is a reaction process widely used in industry, mainly used in the production of hydrogen in industries such as synthetic ammonia and the adjustment of CO / H in the process of syngas production and processing. 2 . The water gas shift reaction can convert CO in the feed gas to water vapor into H 2 and CO 2 , not only can effectively reduce the concentration of CO, but also increase the concentration of H 2 content. In recent years, due to the limited resources of natural gas and light oil and the soaring price of oil, based on the economical considerations of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/882B01J23/887C01B3/16
CPCY02P20/52
Inventor 李达林米金星曹彦宁江莉龙
Owner FUZHOU UNIV
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