Topic
BET theory
About: BET theory is a research topic. Over the lifetime, 9046 publications have been published within this topic receiving 286142 citations.
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TL;DR: The presence of dissolved organic matter (humic material in particular) in source water decreases the effectiveness of granular activated carbon filters in the treatment of drinking water as discussed by the authors, which may be due to an increase in the negative charge on the carbon surface and a decrease in available surface area after adsorption.
249 citations
TL;DR: In this article, the catalytic vapor phase hydrogenation of furfural (FAL) to furfuryl alcohol (FOL) at atmospheric pressure, the gas hourly space velocity (GHSV) has been maintained at 0.5.
Abstract: Cu–MgO catalysts have been employed for the catalytic vapor phase hydrogenation of furfural (FAL) to furfuryl alcohol (FOL) at atmospheric pressure, H 2 /furfural (molar ratio) = 2.5 and the gas hourly space velocity (GHSV) has been maintained at 0.05 mol h −1 g cat −1 . Cu–MgO catalysts with variable Cu loadings (5.2–79.8 wt.%) are prepared by coprecipitation method and are characterized by BET surface area, AAS (atomic adsorption spectroscopy), XRD, XPS and DTA/TGA. Hydrogenation activities of the catalysts, reduced at 523 K in H 2 flow for 4 h prior to the reaction are studied in the temperature range of 453–523 K. Cu–MgO catalyst with 16 wt.% of Cu showed hydrogenation activity with 98% conversion of furfural producing furfuryl alcohol with a higher selectivity of 98%. XPS analysis showed the presence of Cu 0 /Cu + sites on the catalyst surface that may be responsible for the higher activity compared to other Cu–MgO catalysts studied. The turnover frequency of furfural conversion in the catalysts containing lower composition of Cu is very high. However, due to the lack of required number of Cu 0 particles and the absence of Cu + species in these catalysts, the overall conversion of furfural is low.
249 citations
TL;DR: In this article, a high surface area was obtained from various carbon precursors without any stabilization and activation processes, without any activation process, and the surface area of the carbons obtained could reach to high value, as high as 2000 m2/g, even though activation process was not applied.
248 citations
TL;DR: In this article, a nano-magnetic catalyst KF/CaO-Fe3O4 was prepared by a facile impregnation method and the magnetic property of the catalyst was studied by vibrating sample magnetometer (VSM).
247 citations
TL;DR: In this paper, mesoporous TiO2 nanometer thin films were prepared on fused quartz by the dip-coating sol-gel method from a system containing a triblock copolymer as a template (or pore-forming agent), and then calcined at different temperatures.
Abstract: Mesoporous TiO2 nanometer thin films were prepared on fused quartz by the dip-coating sol–gel method from a system containing a triblock copolymer as a template (or pore-forming agent), and then calcined at different temperatures. These films were characterized by X-ray diffraction, atomic force microscopy, X-ray photoelectron spectroscopy, BET surface area and UV-visible spectrophotometry. The photocatalytic activity and photo-induced super-hydrophilicity of the films were evaluated by the photocatalytic degradation of acetone and water contact angle measurement in air, respectively. It was found that the thin films calcined at 700 °C not only show the highest photocatalytic activity, but also possess the greatest light-induced hydrophilicity and the slowest conversion rate from the hydrophilic to a hydrophobic state. The former is attributed to the fact that the films calcined at 700 °C are composed of anatase and rutile, which
is beneficial in enhancing the transfer of photo-generated electrons from the anatase to the rutile phase, reducing the electron–hole combination rate in anatase and enhancing its activity. The high light-induced hydrophilicity and slow hydrophilic to hydrophobic conversion rate are due to the synergetic effect of good photocatalytic activity, sufficient surface hydroxyl content and a degree of surface roughness. Because of their high specific surface areas and mesoporous structures, the photocatalytic activity of mesoporous TiO2 thin films is higher than that of conventional TiO2 thin films.
247 citations