Reduction of nitric oxide by arc vaporized carbons (AVC)

Tsang, Samuel C. S.

doi:10.1016/0926-3373(95)00078-x

Cited by 1 publication

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“…To date, most studies involving the oxidation of carbon nanotubes by NO have been focused on maximizing NO conversion (to N 2 ) rates as a mitigation technology; although NO is also expected to activate the surface of the MWCNTs, there have been few descriptions of the effect. 42,46 In fact, NO has the potential to be an excellent CNT-oxidizing agent, because it oxidizes carbon more slowly 41,47 than other gaseous reagents, such as CO 2 and air. 48,49 Of the reactions that are reported to occur during the oxidation of C by NO, 47,50,51 eqs 1−3 are of major interest for surface activation:…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…Here, we study the chemical oxidation of MWCNTs by nitric oxide (NO, the major component of NO x , ), which is an industrial pollutant that is produced in large amounts, at a concentration similar to that found in industrial effluent streams (1200 ppm). , While studying CNT-supported catalysts, we noted that MWCNTs that were subjected to a NO atmosphere underwent morphological and chemical changes. Furthermore, NO oxidizes carbonaceous substrates, , and could therefore be used to introduce oxygenated groups at a CNT surface. We endeavored to quantify this effect in terms of surface functional groups and material properties.…”

Section: Introductionmentioning

confidence: 99%

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A Simple Gas–Solid Route To Functionalize Ordered Carbon

Variava

Church

Husin

et al. 2014

ACS Appl. Mater. Interfaces

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The reaction of nitric oxide (NO) and carbonaceous materials generates nitrogen functionalities on and in graphitic carbons and oxidizes some of the carbon. Here, we have exploited these phenomena to provide a novel route to surface-functionalized multiwalled carbon nanotubes (MWCNTs). We investigated the impacts of NO on the physical and chemical properties of industrially synthesized multiwalled carbon nanotubes to find a facile treatment that increased the specific surface area (S BET) of the MWCNTs by ∼20%, with only a minimal effect on their degree of graphitization. The technique caused less material loss (∼12 wt %) than traditional gas-based activation techniques and grafted some nitrogen functional groups (1.1 at. %) on the MWCNTs. Moreover, we found that Ni nanoparticles deposited on NO-treated MWCNTs had a crystallite size of d Ni = 13.1 nm, similar to those deposited on acid-treated MWCNTs (d Ni = 14.2 nm), and clearly much smaller than those deposited under the same conditions on untreated MWCNTs (d Ni = 18.3 nm).

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