Catalyst for oxidation of metal mercury

一种氧化催化剂、金属汞的技术，应用在金属/金属氧化物/金属氢氧化物催化剂、物理/化学过程催化剂、催化剂活化/制备等方向，能够解决氧化除去未作记载、SO2氧化活性增加等问题

Active Publication Date: 2009-09-09
MITSUBISHI POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a big problem in this method as follows: with the increase of catalyst amount, SO 2 Oxidative activity also increased
In addition, in Patent Documents 3 and 4, there is no description on the oxidative removal of metallic mercury.

Method used

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  • Catalyst for oxidation of metal mercury

Examples

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preparation example Construction

[0021] In the preparation method of Mo-V composite oxide, as molybdenum raw material, except well-known molybdate alkali metals such as ammonium molybdate and sodium molybdate, molybdate, molybdenum trioxide can also be used, if molybdate alkali metal, when When using alkali metal molybdates containing alkali metals such as sodium, potassium, and magnesium or alkaline earth metals, these alkali metal components may become catalyst poisons and may accelerate catalyst deterioration, so ammonium molybdate is preferably used.

[0022] As a vanadium raw material, a vanadium compound having a vanadium valence of 4 or less can be used, for example, vanadium dioxide, vanadium oxalate, etc. are preferably used. Vanadium compounds with a vanadium valence of 5, such as ammonium vanadate and vanadium pentoxide, are not preferable because they tend to form separate oxides of molybdenum and vanadium even if they are mixed with the above-mentioned molybdenum compounds, and are difficult to fo...

Embodiment 1

[0028] Titanium dioxide, ammonium paratungstate, water and silica-based inorganic fibers were mixed and kneaded with a kneader to obtain a catalyst paste with a composition Ti / W=95 / 5 (atomic ratio). In addition, a steel strip made of SUS430 was processed into a wire mesh to form a net-like base material with an opening of about 2 mm. The above-mentioned catalytic paste was placed on the base material, and a pressure roller was passed through to press-coat the catalyst paste between the meshes and the surface of the base material to form a plate-shaped object with a thickness of 0.7 mm. This plate-like material was dried at 150° C. for 2 hours, and then sintered at 500° C. for 2 hours in the air to obtain a plate-shaped porous carrier.

[0029] Ammonium molybdate and vanadium sol (VO 2 Sol: 20 wt%) were mixed so that the Mo / V atomic ratio was 1 / 1, and evaporated and dried at 150° C. for about 2 hours. The obtained powder was sintered at 500° C. for 2 hours in the air, and the...

Embodiment 2

[0031] A plate-shaped catalyst was prepared in the same manner as in Example 1 except that the vanadium raw material was changed from vanadium sol to vanadium oxalate. In this example, too, the Mo-V catalyst was supported in layers only on the surface of the plate-shaped porous carrier, and was formed with Mo-V composite oxide as a main component.

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Abstract

The invention is directed to providing a catalyst having higher mercury oxidation performance than a conventional catalyst without increasing catalyst quantity or enhancing SO 2 oxidation performance and constitutes an oxidation catalyst for metal mercury, which contains a molybdenum and vanadium complex oxide, for example, MoV 2 O 8 , as a main component having a catalytic activity and which is formed by placing the molybdenum and vanadium complex oxide in layers only on the surface of a plate-like or honeycomb-like porous carrier. The porous carrier contains Ti and W and has a function of an NOx removal catalyst as a whole.

Description

technical field [0001] The present invention relates to an oxidation catalyst for metallic mercury contained in exhaust gas and a method for purifying exhaust gas. Background technique [0002] In recent years, people are concerned about the depletion of oil, and thermal power generation fueled by coal, which is rich in recoverable reserves and less geographically concentrated, is expected to play an important role as a long-term stable supply source of energy in the future. [0003] On the other hand, regarding trace elements (mercury (Hg), selenium (Se), arsenic (As), cadmium (Cd), lead (Pd) ), etc.), are known to be toxic to organisms when the permissible concentration in the environment is exceeded. In particular, elemental mercury with a high vapor pressure is easily released into the atmosphere. If it comes into contact with the human body, even a small amount can cause nerve damage, kidney damage, and cardiovascular disease. In addition, when inorganic mercury relea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/86B01J23/30
CPCB01J23/28B01D53/8665B01J35/002B01D2255/20723B01J37/0244B01D2255/20776B01J23/002B01J23/30B01D2255/20769B01J37/0225B01J2523/00B01J35/30B01J2523/55B01J2523/68B01J23/22B01D53/86B01J35/56
Inventor 甲斐启一郎加藤泰良
Owner MITSUBISHI POWER LTD
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