Methane oxidation catalyst

A methane oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve the problems of methane escape and achieve excellent methane oxidation activity

Active Publication Date: 2019-04-02
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, there is a problem of generating 0.2% to 2% of unburned methane, so-called "methane slip"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～1-4

[0100] Dissolve dinitrosodiammine platinum in nitric acid to prepare a Pt solution with a pH of 1 or less, and then heat the solution to 60°C, then add tin oxide powder of a specified concentration (D50 = 44 μm, BET =14m 2 / g), making Pt loaded on SnO 2 After granulation, heat the solution to evaporate to dryness, and then use a large hot air dryer to dry it, bake it at 550°C for 3 hours in the atmosphere, and crush it with a mortar to obtain Pt-loaded tin oxide powder (sample).

[0101] At this time, the Pt content of the Pt solution is adjusted so that the Pt (platinum) relative to the SnO 2 The content is 2wt% (embodiment 1-1), 4wt% (embodiment 1-2), 8wt% (embodiment 1-3), 12wt% (embodiment 1-4).

Embodiment 2-1～2-4

[0103] Dissolve dinitrosodiammine platinum in nitric acid to prepare a Pt solution with a pH of 1 or less, and then heat the solution to 60°C, then add tin oxide powder of a specified concentration (D50 = 1.2 μm, BET=39m 2 / g), making Pt loaded on SnO 2 After granulation, heat the solution to evaporate to dryness, and then use a large hot air dryer to dry it, bake it at 550°C for 3 hours in the atmosphere, and crush it with a mortar to obtain Pt-loaded tin oxide powder (sample).

[0104] At this time, the Pt content of the Pt solution is adjusted so that the Pt (platinum) relative to the SnO 2 The content is 2wt% (embodiment 2-1), 4wt% (embodiment 2-2), 8wt% (embodiment 2-3), 12wt% (embodiment 2-4).

[0105] (Crystalline diameter of Pt-loaded tin oxide)

[0106] The crystallite diameter (base material) of the tin oxide of the Pt-loaded tin oxide powder obtained in the example / comparative example was measured by the Rietveld method as follows.

[0107] Analysis was perform...

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Abstract

The present invention enables a methane oxidation catalyst to exhibit excellent methane oxidation activity at a lower temperature by further improving the methane oxidation catalyst having a structureobtained by supporting platinum on tin oxide. Proposed is a methane oxidation catalyst for oxidizing methane in exhaust gas, the methane oxidation catalyst being characterized by: having a structureobtained by supporting platinum on tin oxide; and satisfying formula (1): y<=0.27x, when, in a diffraction pattern (2[theta]= 37 DEG to 41 DEG) obtained by measurement using an X-ray diffraction device (XRD), the content (wt%) of platinum with respect to tin oxide is denoted by x and the ratio (Pt(111) / SnO2(111)) of the (111) plane platinum peak intensity with respect to the (111) plane tin oxidepeak intensity is denoted by y.

Description

technical field [0001] The present invention relates to a methane oxidation catalyst for oxidizing unburned methane contained in exhaust gas. Background technique [0002] Currently, heavy oil is used as fuel for diesel engines for generators, ships, etc., but due to the strong demand for environmental preservation / improvement, the conversion to CH 4 Fuel switching. [0003] As the use of CH 4 A typical internal combustion engine of the fuel includes a "gas engine". [0004] The gas engine uses the combustion of gas to generate electricity, and uses its exhaust heat for the combined heating and power generation (steam supply and power generation), so-called "cogeneration" One of the engines used in . [0005] Gas engines have the following advantages: not only CO 2 The discharge volume is small, and in addition to natural gas and city gas, even low-calorie gases such as gases generated in gasification and melting furnaces can be used for high-efficiency operation. It s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01D53/94B01J35/10F01N3/10F01N3/28
CPCB01D53/94F01N3/10F01N3/28B01J23/42B01J23/626B01J35/1009B01J35/1014B01J35/002B01J35/006B01J35/023B01J37/0027B01J37/0009B01J37/0213B01J35/0066B01J35/10B01J23/62B01J35/0053F01N3/2066F01N2370/02
Inventor 林克彦阿部一幸中原祐之辅田平泰规中野宽子金泽一弘五味保城
Owner MITSUI MINING & SMELTING CO LTD
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