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Preparation method capable of improving low-temperature activity of low-pressure cobalt-molybdenum sulfur-tolerant shift catalyst

A sulfur-resistant shift and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problems, to achieve the effect of omitting the impregnation process, reasonable pore structure, and uniform active components

Active Publication Date: 2014-03-05
湖北双雄催化剂有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patents CN1088093C, CN1242847C, CN1242847, CN1110304A CN1091427C, etc. all involve the addition of various components in the preparation of alumina, but no addition of nano molybdenum oxide, nano oxide cobalt report

Method used

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  • Preparation method capable of improving low-temperature activity of low-pressure cobalt-molybdenum sulfur-tolerant shift catalyst
  • Preparation method capable of improving low-temperature activity of low-pressure cobalt-molybdenum sulfur-tolerant shift catalyst
  • Preparation method capable of improving low-temperature activity of low-pressure cobalt-molybdenum sulfur-tolerant shift catalyst

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Effect test

Embodiment 1

[0055] according to figure 2 After drying the raw material α-gibbsite, it is crushed to 325 mesh in the crushing process, and the fine α-gibbsite stays in the high-temperature rapid dehydration device with the hot gas at 600-900 °C in the highly turbulent hot air flow. 0.1 ~ 1 second for flash roasting to generate transitional alumina, and then pass through a cyclone to separate fine powder (ρ-alumina), nano-molybdenum oxide and nano-cobalt oxide (origin: Hubei Zhongao Nanomaterials Co., Ltd. ) Mix evenly, the mixing ratio is 93.5% ρ-alumina, 6.0% nano-molybdenum oxide, 0.5% nano-cobalt oxide (all are mass percentages), and then add deionized water as a binder, in the disk granulation molding The green balls of the required size are made in the machine, and then immersed in an aqueous solution with a concentration of 40% potassium carbonate in mass fraction for hydration. The final activation process is roasted at 450-550 °C to prepare a high-activity cobalt-molybdenum sul...

Embodiment 2

[0057] according to figure 2 After drying the raw material α-gibbsite, it is crushed to 325 mesh in the crushing process, and the fine α-gibbsite stays in the high-temperature rapid dehydration device with the hot gas at 600-900 °C in the highly turbulent hot air flow. 0.1 ~ 1 second for flash roasting to generate transitional alumina, and then pass through a cyclone to separate fine powder (ρ-alumina), nano-molybdenum oxide and nano-cobalt oxide (origin: Hubei Zhongao Nanomaterials Co., Ltd. ) Mix evenly, the mixing ratio is 93.5% ρ-alumina, 6.0% nano-molybdenum oxide, 0.5% nano-cobalt oxide (all are mass percentages), and then add deionized water as a binder, in the disk granulation molding The green balls of the required size are made in the machine, and then immersed in an aqueous solution with a concentration of 50% potassium carbonate in mass fraction for hydration, and the final activation process is roasted at 450-550 ° C to prepare a high-activity cobalt-molybdenum s...

Embodiment 3

[0059] according to figure 2 After drying the raw material α-gibbsite, it is crushed to 325 mesh in the crushing process, and the fine α-gibbsite stays in the high-temperature rapid dehydration device with the hot gas at 600-900 °C in the highly turbulent hot air flow. 0.1 ~ 1 second for flash roasting to generate transitional alumina, and then pass through a cyclone to separate fine powder (ρ-alumina), nano-molybdenum oxide and nano-cobalt oxide (origin: Hubei Zhongao Nanomaterials Co., Ltd. ) Mix evenly, the mixing ratio is 93.5% ρ-alumina, 6.0% nano-molybdenum oxide, 0.5% nano-cobalt oxide (all are mass percentages), and then add deionized water as a binder, in the disk granulation molding The green balls of the required size are made in the machine, and then immersed in an aqueous solution with a concentration of 60% potassium carbonate by mass fraction for hydration, and the final activation process is roasted at 450-550 ° C to prepare a high-activity cobalt-molybdenum s...

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Abstract

The invention relates to a preparation method capable of improving the low-temperature activity of a low-pressure cobalt-molybdenum sulfur-tolerant shift catalyst. The sulfur-tolerant shift catalyst which contains nano-molybdenum oxide and nano-cobalt oxide is produced directly by utilizing a conventional process capable of producing a spherical activated alumina carrier by adopting a quick release method. An impregnation process is omitted; the preparation is simple; the cost is low; catalytic active components are uniform; a porous structure is reasonable; the specific surface area is increased remarkably; the low-temperature activity is high; through the detection at 160 DEG C according to a national chemical industry standard HG / T2779-2009, the CO conversion rate is greater than or equal to 90 percent, the activation temperature is 40 DEG C lower than that of an SB303Q-type cobalt-molybdenum sulfur-tolerant shift catalyst; the low-pressure cobalt-molybdenum sulfur-tolerant shift catalyst is particularly suitable for a depth conversion workshop section of an ammonia synthesis plant, namely the conversion process in which the CO at an outlet of a conversion system is less than equal to 0.3 percent; steam is saved by 300kg per ton of ammonia; the energy-saving effect is remarkable.

Description

technical field [0001] The invention relates to a preparation method for improving the low-temperature activity of a low-pressure cobalt-molybdenum sulfur-resistant shift catalyst. Background technique [0002] At present, there are two main types of cobalt-molybdenum sulfur-tolerant shift catalysts for industrial applications: one is used under low pressure (<3.0MPa) conditions, and the γ-Al 2 o 3 as the carrier; the other type is used under high pressure (≥3.0MPa) conditions, using aluminum-magnesium spinel as the carrier. The former type of low-pressure cobalt-molybdenum sulfur-tolerant shift catalyst, after more than 20 years of development and improvement, the production process is stable and mature, and spherical γ-Al catalysts are used in industrial practice 2 o 3 It is formed by impregnating cobalt, molybdenum and potassium active components as a carrier, drying and sieving. It is very difficult for the low-temperature activity of the cobalt-molybdenum shift c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/882
Inventor 周志斌黄远军肖辉亚程瑞陈劲松
Owner 湖北双雄催化剂有限公司
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