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Catalyst and hydrogen production method for decomposing sulfur trioxide

A sulfur trioxide and catalyst technology, which is applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as difficulty in industrial-scale application, reduced catalytic activity, and expensive platinum catalysts

Active Publication Date: 2015-10-14
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that when a platinum catalyst is used for this reaction, the catalyst has high performance at the beginning of use, however, platinum is oxidized with oxygen generated in the reaction, and the catalytic activity decreases due to the coarsening of platinum particles
In addition, platinum catalysts are expensive, so their industrial-scale application is difficult

Method used

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  • Catalyst and hydrogen production method for decomposing sulfur trioxide
  • Catalyst and hydrogen production method for decomposing sulfur trioxide
  • Catalyst and hydrogen production method for decomposing sulfur trioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0137] In this example, a composite metal oxide (Cu—V—O) of copper (Cu) and vanadium (V) was used as a catalyst.

[0138] (manufacturing of unsupported catalysts)

[0139] Copper oxide and vanadium oxide with an atomic ratio of each metal of 1:1 were ground and thoroughly mixed in a mortar, and the mixture was put into a crucible made of alumina and fired at 750°C for 12 hours, thus obtaining the Catalysts are unsupported catalysts. figure 1 (a) shows the X-ray diffraction analysis (XRD) results of the obtained unsupported catalyst.

[0140] (manufacturing of supported catalysts)

[0141] A supported catalyst in which a composite metal oxide is supported on a porous silica support having a pore structure is manufactured as follows.

[0142] (Manufacture of supported catalysts – manufacture of porous silica supports)

[0143] The porous silica carrier used for this supported catalyst was produced by a method similar to the method described in JP-A-2008-12382. That is, the ...

Embodiment A2

[0152] In Example A2, a composite metal oxide (Cr—V—O) of chromium (Cr) and vanadium (V) was used as a catalyst. Here, an unsupported catalyst was produced in the same manner as in Example A1 except that the firing temperature was changed to 700° C. in the production of the unsupported catalyst.

[0153] figure 1 (b) shows the X-ray diffraction analysis (XRD) results of the obtained unsupported catalyst.

Embodiment A3

[0155] In Example A3, a composite metal oxide (Cr—V—O) of cerium (Ce) and vanadium (V) was used as a catalyst. Here, an unsupported catalyst and a supported catalyst were produced in the same manner as in Example A1 except that the firing temperature was changed to 700° C. in the production of the unsupported catalyst.

[0156] figure 2 (a) shows the X-ray diffraction analysis (XRD) results of the obtained unsupported catalyst.

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Abstract

To provide a sulfur trioxide decomposition catalyst, particularly, a sulfur trioxide decomposition catalyst capable of lowering the temperature required when producing hydrogen by an S—I cycle process. A sulfur trioxide decomposition catalyst comprising a composite oxide of vanadium and at least one metal selected from the group consisting of transition metal and rare earth elements is provided. Also, a sulfur dioxide production process comprising decomposing sulfur trioxide into sulfur dioxide and oxygen by using the sulfur trioxide decomposition catalyst above, is provided. Furthermore, a hydrogen production process, wherein the reaction of decomposing sulfur trioxide into sulfur dioxide and oxygen by an S—I cycle process is performed by the above-described sulfur dioxide production process, is provided.

Description

[technical field] [0001] The invention relates to a method for decomposing sulfur trioxide (SO 3 ) catalyst. The present invention also relates to a hydrogen production method comprising the step of decomposing sulfur trioxide by using a catalyst for decomposing sulfur trioxide. [Background technique] [0002] In recent years, due to problems such as global warming, hydrogen has attracted attention as a clean energy source that does not generate carbon dioxide during combustion. [0003] Generally, in order to produce hydrogen, steam reforming of hydrocarbon fuel represented by the following formulas (A1) and (A2): [0004] (A1)C n h m +nH 2 O→nCO+(n+m / 2)H 2 [0005] (A2)CO+H 2 O→CO 2 +H 2 [0006] Overall Response: C n h m +2nH 2 O→nCO 2 +(2n+m / 2)H 2 [0007] Therefore, although hydrogen combustion itself does not generate carbon dioxide, carbon dioxide is usually generated during hydrogen production. [0008] In this regard, use of solar thermal energy or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J37/02B01J35/10B01J23/847C01B3/06
CPCB01J23/8472B01J23/22B01J23/26B01J29/0333B01J29/0341B01J35/002B01J35/1061B01J35/109B01J37/0201B01J37/0205B01J37/0242C01B3/068Y02E60/36Y02A50/20B01J35/69B01J35/647B01J2235/15B01J35/30
Inventor 竹岛伸一町田正人
Owner TOYOTA JIDOSHA KK