Catalyst and method of manufacture

a technology of catalysts and catalysts, applied in the field of catalysts, can solve the problems of ammonia slippage, ammonia solutions require an extra storage tank, and are subject to freezing

Inactive Publication Date: 2011-05-26
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of ammonia may be undesirable, and there may be some ammonia slip due to imperfect distribution of reacting gases as well as due to incomplete ammonia consumption.
Further, ammonia solutions require an extra storage tank and are subject to freezing at cold ambient tem

Method used

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  • Catalyst and method of manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Silver Nanocrystals

[0102]To a 3-neck flask equipped with a stirrer was charged silver acetate (4 millimoles, SA), oleic acid (4 milliliters, OA, technical grade, 90 percent, Aldrich) and trioctylamine (15 milliliters, TOA) at a temperature of about 25 degrees C. (room temperature). The resultant mixture was heated under a vacuum of 1 millimeter of mercury to a temperature of about 60 degrees C. As the temperature increased the silver acetate started to dissolve in the trioctylamine. Bubbling was observed in the flask, due the boiling of water present as an impurity in the reaction material. The water was removed under vacuum in the form of water vapor. When the temperature rose to 60 degrees C., silver acetate was completely dissolved in the trioctylamine and the resultant solution turned to a brown-grey-black color, indicating the decomposition of silver acetate and the formation of silver nanocrystals. The temperature was then increased to 90 degrees C. and the mixt...

examples 2-3

Preparation of Silver Nanocrystals

[0107]Examples 2 and 3 were carried out in a manner similar to that described above in Example 1 except in that they were carried out in relatively larger scales. The amounts of silver acetate, oleic acid, and trioctylamine used and the resultant concentration of AgNC in hexane and PSD of AgNC are included in Table 3 below. Examples 2 and 3 show that a PSD of less that 10 percent can be achieved even in large scale batches.

TABLE 3Concentration ofSAOATOAAgNC in hexaneExample(millimoles)(milliliters)(milliliters)(grams per liter)PSD of AgNC1441532.4 to 53.9Less than 10 percent240408032.4 to 53.9Less than 10 percent310010020032.4 to 53.9Less than 10 percent

examples 4-7

Preparation of First Catalytic Composition

[0108]To a 3-neck flask equipped with a stirrer was charged aluminum (sec-butoxide)3 (50 grams) and IPA (200 milliliters). A predetermined amount of AgNC in hexane solution containing 43.1 grams (0.4 moles) AgNC in hexane, was then added to the flask to form a first solution. The predetermined amount of AgNC in hexane solution added and the resultant loading of AgNC obtained in the catalyst composition is included in Table 4 below. Following the addition to the flask, the mechanical stirrer was turned on using a speed of about 60 revolutions per minute in another separate flask, ethyl acetoacetate (2.65 grams), Triton X-114 (14 grams), and 65 milliliters isopropyl alcohol were added to form a second solution. The second solution was then poured into the first solution. The resultant mixture was stirred for about 30 minutes at a speed of about 180 revolutions per minute at a temperature of about 25 degrees C. During the 30-minute stir period,...

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Abstract

A catalyst system comprising a first catalytic composition comprising a homogeneous solid mixture containing at least one catalytic metal and at least one metal inorganic support. The pores of the solid mixture have an average diameter in a range of about 1 nanometer to about 15 nanometers. The catalytic metal comprises nanocrystals.

Description

BACKGROUND[0001]The systems and techniques described include embodiments that relate to catalysts. They also include embodiments that relate to the making of catalysts and systems that may include catalysts.[0002]Exhaust streams generated by the combustion of fossil fuels, such as in furnaces, ovens, and engines, contain various potentially undesirable combustion products including nitrogen oxides (NOx), unburned hydrocarbons (HC), and carbon monoxide (CO). NOx, though thermodynamically unstable, may not spontaneously decompose in the absence of a catalyst. Exhaust streams may employ exhaust treatment devices to remove NOx from the exhaust stream.[0003]Examples of exhaust treatment devices include catalytic converters (e.g., three-way catalyst, oxidation catalysts, selective catalytic reduction (SCR) catalysts, and the like), evaporative emission devices, scrubbing devices (e.g., hydrocarbon (HC), sulfur, and the like), particulate filters / traps, adsorbers / absorbers, plasma reactors...

Claims

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Application Information

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IPC IPC(8): F01N3/10B01J29/06B01J29/064B01J29/40B01J29/18B01J29/08B01J23/652B01J23/24B01J23/75B01J23/06B01J23/50
CPCB01J21/04F01N13/009B01J29/068B01J35/0006B01J35/0013B01J37/0203B01J37/0211B01J37/035B01J37/036F01N3/025F01N3/035F01N3/2066F01N2240/30F01N2370/02F01N2370/04F01N2610/03F01N2610/04Y02T10/24F01N13/0093B01J23/50Y02T10/12B01J35/1061B01J35/1085
Inventor YIN, MINGLEWIS, LARRY NEILSICLOVAN, OLTEA PUICAHANCU, DANWINKLER, BENJAMIN HALENORTON, DANIEL GEORGEMHADESHWAR, ASHISH BALKRISHNA
Owner GENERAL ELECTRIC CO
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