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Preparation method of increasing intermediate-temperature iron chromium transformation catalyst performance using nano magnesia

A nano-magnesium oxide, transformation catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc.

Inactive Publication Date: 2011-01-12
湖北双雄催化剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The iron-chromium medium-change catalyst not only causes harm to the human body and the environment in the process of manufacturing, loading and use, but also causes secondary pollution when the spent catalyst is disposed of

Method used

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  • Preparation method of increasing intermediate-temperature iron chromium transformation catalyst performance using nano magnesia
  • Preparation method of increasing intermediate-temperature iron chromium transformation catalyst performance using nano magnesia
  • Preparation method of increasing intermediate-temperature iron chromium transformation catalyst performance using nano magnesia

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Experimental program
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Effect test

Embodiment 1

[0018] according to figure 1 The preparation process for the production of iron-chromium-based medium-temperature shift catalysts is to add ferrous sulfate, ammonia water, ammonium carbonate, chromic anhydride and other solutions into the reaction kettle in parallel, and stir at a high speed. Weakly alkaline, then weakly acidic, and finally back to weakly alkaline for neutralization, realizing the "swing method" of pH value and co-precipitation neutralization process, and the obtained material is γ-Fe 2 o 3 , after boiling, aging, and washing, the material enters the beating process, in which heavy magnesium oxide and aluminum hydroxide are added, filtered and dried, and then enters the grinding process. After grinding for 1 to 2 hours, it is granulated, 350 Roast at ~400°C for 4-6 hours, then mix with graphite and press into tablets to form, that is, the production of medium-temperature iron-chromium shift catalyst is completed (this product is B112 medium-temperature shift...

Embodiment 2

[0020] according to figure 1 The preparation process for the production of iron-chromium-based medium-temperature shift catalysts is to add ferrous sulfate, ammonia water, ammonium carbonate, chromic anhydride and other solutions into the reaction kettle in parallel, and stir at a high speed. Weakly alkaline, then weakly acidic, and finally back to weakly alkaline for neutralization, realizing the "swing method" of pH value and co-precipitation neutralization process, and the obtained material is γ-Fe 2 o 3 , after boiling, aging, and washing, the material is added with aluminum hydroxide for beating, filtered, and dried to enter the grinding process. In the grinding process, heavy magnesium oxide is added, and it is granulated after grinding for 1-2 hours. 350-400 ℃ for 4 to 6 hours, and then mixed with graphite and pressed into tablets to form a medium temperature iron-chromium shift catalyst (this product is a B116 medium temperature shift catalyst produced by Hubei Shuan...

Embodiment 3

[0022] according to figure 1 The preparation process for the production of iron-chromium-based medium-temperature shift catalysts is to add ferrous sulfate, ammonia water, ammonium carbonate, chromic anhydride and other solutions into the reaction kettle in parallel, and stir at a high speed. Weakly alkaline, then weakly acidic, and finally back to weakly alkaline for neutralization, realizing the "swing method" of pH value and co-precipitation neutralization process, and the obtained material is γ-Fe 2 o 3 , after boiling, aging, and washing, the material is added with aluminum hydroxide for beating, filtered, and dried to enter the milling process; 1.5% of nano-magnesia (calculated as a mass percentage of nano-magnesia) is added, and the particle size is ≤ 100nm. Stir and emulsify with anhydrous alcohol at high speed, then spray it evenly into the milling process with a high-efficiency atomizing nozzle, mill for 1-2 hours, then granulate, bake at 350-400°C for 4-6 hours, a...

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Abstract

The invention relates to a method for preparing an intermediate-temperate iron-chromium transformation catalyst, which is characterized in that a structural additive of the catalyst is changed from the prior heavy magnesium oxide into nanometer magnesium oxide; the surface effect of nanometer material is utilized to ensure that nanometer MgO and Fe2O3 are easy to form a stable spinel structure; and the active-phase Fe3O4 particles of the catalyst after reduction are highly dispersed. Therefore, the heat-resisting stability, sulfur resistance and mechanical strength of the catalyst are all superior to the prior intermediate-temperate iron-chromium transformation catalyst (such as B112 and B116 type intermediate-temperate transformation catalyst which are sold on the market and produced by Hubei Shuangxiong Catalyst Co., Ltd.). On the one hand, the method can improve certain performances of the catalyst, such as heat-resisting stability, sulfur-resisting capability and mechanical strength, and on the other hand, the method also enables the catalyst to develop in an efficient and environment-friendly direction.

Description

technical field [0001] The invention relates to a preparation method of a medium-temperature iron-chromium shift catalyst. Background technique [0002] Medium-temperature carbon monoxide shift catalyst is the most widely used and most used shift catalyst in coal chemical industry. It has been used in ammonia synthesis, methanol synthesis, hydrogen production and city gas for more than 90 years. Industrial carbon monoxide medium temperature shift catalysts are mainly Fe-Cr catalysts, which were successfully developed by Bosch and Wild in 1912. Industrial applications began in 1915 and were widely used in the 1930s. Traditional medium temperature shift catalysts use iron oxide as the catalyst. The main body uses chromium trioxide as a structural aid. [0003] Its active phase is composed of Fe 2 o 3 Partially reduced Fe 3 o 4 . Its reduction reaction equation is as follows: [0004] 3Fe 2 o 3 +H 2 =2Fe 3 o 4 +H 2 o [0005] 3Fe 2 o 3 +CO=2Fe 3 o 4 +CO 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/86B01J23/78
Inventor 周志斌胡中光熊俊杰
Owner 湖北双雄催化剂有限公司