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Methods for using metal catalysts in carbon oxide catalytic converters

A technology of metal catalysts and carbon oxides, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc.

Inactive Publication Date: 2015-01-28
SEERSTONE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One obstacle to the widespread use of CNTs is the cost of fabrication

Method used

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  • Methods for using metal catalysts in carbon oxide catalytic converters
  • Methods for using metal catalysts in carbon oxide catalytic converters
  • Methods for using metal catalysts in carbon oxide catalytic converters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171] A mild steel disc sample with extensive red rust spots was used as catalyst. A mild steel disc is positioned in the tube furnace 1 at about the centerline. The vacuum pump 5 was started and helium was used to purge the experimental apparatus for five minutes. Five minutes later, the vacuum pump 5 was turned off, the compressor 3 was turned on, the refrigerated condenser 4 was turned on, and the helium flow continued until the pressure reached 90.6 kPa (680 Torr), at which point the gas flow was turned off. The heating elements of the tube furnace 1 are then switched on.

[0172] When the furnace 1 temperature reached a temperature of 680° C., the vacuum pump 5 was turned on and the experimental apparatus was purged for five minutes with a reaction gas in a stoichiometric mixture of carbon dioxide and hydrogen delivered from the gas supply 6 through the mixing valve 7 . After five minutes, the vacuum pump 5 was switched off. When the experimental apparatus reached a p...

Embodiment 2

[0175] The quartz disk was placed flat in the 304 stainless steel disc used as catalyst. The wafer is positioned in the furnace 1 at about the centerline. The experimental apparatus was helium-purged as in Example 1 and heated. Reactive gases were added and circulated for another hour at a temperature of 680° C. and a pressure between 85.3 kPa (640 Torr) and 101.3 kPa (760 Torr), as in Example 1 .

[0176] After the furnace 1 had cooled, the stainless steel samples were removed from the furnace 1 . CNT mats are grown between quartz and stainless steel discs. A portion of the CNT mat is bonded to quartz and stainless steel surfaces. Figure 9 show samples at 10,000x magnification, and Figure 10 Sample shown at 100,000x magnification. The size of the CNTs (tens to hundreds of nanometers in diameter) indicates that they may be multi-walled CNTs.

Embodiment 3

[0178] 316L stainless steel discs were used as catalysts. A 316L stainless steel disc was placed in Furnace 1 at about the centerline. The experimental apparatus was helium-purged as in Example 1 and heated. Reactive gases were added and recirculated for one hour as in Example 1, but at a temperature of 700°C and a pressure between 93.3 kPa (700 Torr) and 97.3 kPa (730 Torr).

[0179] The stainless steel discs were removed from the furnace 1 after the furnace 1 had cooled. Figure 11 is a photo of a stainless steel disc. Carbon nanotubes grow on only a portion of the wafer. The reason for this condition is unknown. Figure 12 an image showing an area of ​​a CNT forest on a wafer at 2,500x magnification, and Figure 13 Image showing the same area of ​​the CNT forest at 10,000x magnification. The diameter of the tube indicates that it may be a multi-walled CNT.

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Abstract

A method of reducing a gaseous carbon oxide includes reacting a carbon oxide with a gaseous reducing agent in the presence of a steel catalyst. The reaction proceeds under conditions adapted to produce solid carbon of various allotropes and morphologies the selective formation of which can be controlled by means of controlling reaction gas composition and reaction conditions including temperature and pressure. A method for utilizing a steel catalyst for reducing carbon oxides includes placing the steel catalyst in a suitable reactor and flowing reaction gases comprising a carbon oxide with at least one gaseous reducing agent through the reactor where, in the presence of the steel catalyst, at least a portion of the carbon in the carbon oxide is converted to solid carbon and a tail gas mixture containing water vapor.

Description

[0001] priority statement [0002] This application claims the benefit of the filing date of U.S. Provisional Patent Application Serial No. 61 / 624,848 "Methods for Using Metal Catalysts in Carbon Oxide Catalytic Converters," filed April 16, 2012, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] Embodiments of the present disclosure relate to large-scale catalytic conversion of carbonaceous feedstocks to solid carbon, and more particularly, to methods of converting carbon monoxide, carbon dioxide, or mixtures of any combination thereof to produce carbon nanotube structures. Background technique [0004] US Patent Publication No. 2012 / 0034150A1, published February 9, 2012, the disclosure of which is incorporated herein by reference in its entirety, discloses background information pertaining to this document. [0005] Additional information is disclosed in the following documents, the disclosures of which are incorporated he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J23/745B01J37/08B82B1/00B82B3/00
CPCB01J23/745B01J35/002C01B31/0233B82Y40/00B01J37/16B82Y30/00B01J37/18C01B32/162C01B32/164
Inventor D·B·诺伊斯
Owner SEERSTONE
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