• 한국전기화학회:학술대회논문집
• /
• 2004.04a
• /
• pp.26-26
• /
• 2004

• Bulletin of the Korean Chemical Society
• /
• v.30 no.12
• /
• pp.3045-3048
• /
• 2009

Graphene sheets formed by the reaction of carbon monoxide (CO) with aluminum sulfide ($Al_2S_3$) at reaction temperatures ${\leq}$ 800 $^{\circ}$ were characterized by X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM). The graphene sheets, formed as CO was reduced to gaseous carbon by the reaction with $Al_2S_3$, in the temperature range 800 - 1100 $^{circ}C$, did not exhibit their characteristic XRD peaks because of the small number of graphene layers and/or low crystallinity of graphene sheets. Raman spectra of graphene sheets showed that the intensity ratio of the D band to the G band decreased and the 2D band was shifted to higher frequencies with increasing reaction temperature, indicating that the number of graphene layers increased with increasing reaction temperature.

• Nuclear Engineering and Technology
• /
• v.55 no.9
• /
• pp.3194-3201
• /
• 2023

In water-cooled power reactor, hydrogen is generated in case of steam zirconium reaction during severe accident condition and later on in addition to hydrogen; CO is also generated during molten corium concrete interaction after reactor pressure vessel failure. Passive Autocatalytic Recombiners (PARs) are provided in the containment for hydrogen management. The performance of the PARs in presence of hydrogen and carbon monoxide along with air has been evaluated. Depending on the conditions, CO may either react with oxygen to form carbon dioxide (CO2) or act as catalyst poison, reducing the catalyst activity and hence the hydrogen conversion efficiency. CFD analysis has been carried out to determine the effect of CO on catalyst plate temperature for 2 & 4% v/v H₂ and 1-4% v/v CO with air at the recombiner inlet for a reported experiment. The results of CFD simulations have been compared with the reported experimental data for the model validation. The reaction at the recombiner plate is modelled based on diffusion theory. The developed CFD model has been used to predict the maximum catalyst temperature and outlet species concentration for different inlet velocity and temperatures of the mixture gas. The obtained results were used to fit a correlation for obtaining removal rate of carbon monoxide inside PAR as a function of inlet velocity and concentrations.

• Journal of the korean Society of Automotive Engineers
• /
• v.3 no.1
• /
• pp.46-53
• /
• 1981

This paper describes emission control of hydrocarbon and carbon-monoxide due to oxidizing catalyst. The experiment was performed on a precious metal pelleted catalyst(Pt). The factors of the efficiency for purification due to oxidizing catalyst are space velocity, temperature, composition of exhaust gas and supplementary air. The experiment was carried out to control the factors of efficiency for purification. The results of experimental study show that temperature of catalytic converter, supplementary air and space velocity affected the efficiency for purification of hydrocarbon and carbon monoxide.

• Bulletin of the Korean Chemical Society
• /
• v.31 no.12
• /
• pp.3864-3865
• /
• 2010

• Journal of Korean Society of Occupational and Environmental Hygiene
• /
• v.31 no.1
• /
• pp.13-21
• /
• 2021

Objectives: The purpose of this study was to evaluate the exposures of cashiers who work at expressway tollbooths. Methods: We measured temperature(temp.), relative humidity(RH), and contaminants with direct reading instruments at ten expressway toll gate in September 2015. Elemental carbon was collected on the quartz filters and analyzed with an OCEC analyzer. Results: The average levels for temp., RH, carbon monoxide, carbon dioxide, dust(PM10), and black carbon were respectively 24.6~27.8℃, 32.3~65.3%, 0.5~1.2 ppm, 456~559 ppm, 12~111 ㎍/㎥, and 3.1~10.1 ㎍/㎥ at each tollbooth. The concentrations of elemental carbon within the tollbooth(1.8~7.2 ㎍/㎥) were lower than outdoors(2.5~10.0 ㎍/㎥), but exhibited a high correlation(r2=0.855). The exposure levels for carbon monoxide, black carbon, and elemental carbon in the tollbooths were significantly higher than the offices. The concentrations of black carbon and elemental carbon showed a high correlation(r2=0.756). Conclusions: The levels of contaminants were below the occupational exposure limits in the expressway tollbooth. There were ventilation and air conditioning systems in the booths, but it is necessary to maintain and use the systems properly.

• 월간산업보건
• /
• s.360
• /
• pp.14-19
• /
• 2018

• 월간산업보건
• /
• s.361
• /
• pp.14-18
• /
• 2018

• 월간산업보건
• /
• s.362
• /
• pp.29-33
• /
• 2018

• 월간산업보건
• /
• s.363
• /
• pp.8-13
• /
• 2018