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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: In this paper, carbon nanofibers (CNF) characterized by different mean diameter, BET surface area and graphicity were used as supports to enhance Pt dispersion in low temperature fuel cell catalyst.
Abstract: Carbon nanofibers (CNF) characterized by different mean diameter, BET surface area and graphicity were prepared and used as supports to enhance Pt dispersion in low temperature fuel cell catalyst. As a comparison, a conventional Pt on carbon black (Vulcan XC72R) catalyst was prepared using the same procedure. The most appropriate Pt dispersion was achieved for the carbon nanofiber support showing the best compromise in terms of BET surface area and graphicity. This catalyst shows enhanced electrochemical active surface area (ECSA) and performance for the oxygen reduction reaction (ORR) with respect to the Pt/Vulcan catalyst. A cross-analysis of the supports physical-chemical properties, ECSA and mass activity for the ORR suggests that both Pt dispersion and electronic properties as determined by the effect of surface groups and graphicity play a significant role in determining the electrocatalytic activity. Whereas, regarding the decay associated to the corrosion in accelerated degradation tests (ADT), two mitigation effects are envisaged, anchoring effect of surface groups stabilizes Pt nanoparticles with respect to dissolution, whereas a high surface graphicity index reduces carbon corrosion which acts as support for the Pt particles.
107 citations
TL;DR: The experimental results showed that the dependence of BPA degradation on the alumina content was attributable to the crystal structure, crystalline and also the properties of their surface structures, and it was confirmed that the mixed crystal structure of maghemite and hematite could achieve the higher photocatalytic activity than maghemites or hematites alone.
107 citations
TL;DR: In this article, the expected orthorhombic perovskite structure of the chromite is observed for all levels of substitution and maximum activity is achieved for the catalyst with x ǫ = 0.1 in which mixed oxide formation upon substitution of lanthanum by strontium in the chromites becomes maximised.
107 citations
TL;DR: A series of Fe−Mn-based transition metal oxides were prepared and used for NO adsorption at 25 °C in the presence of O2, and the sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy.
Abstract: A series of Fe−Mn-based transition metal oxides were prepared and used for NO adsorption at 25 °C in the presence of O2. The sorbents were also characterized by BET surface area, TPD, XRD, and FTIR spectroscopy. Both TGA and chemiluminescent NO/NOx analyzer experiments showed that the mixed oxides were efficient and reversible sorbents for NO removal. The NOx capacity decreased in the order of Fe−Mn−Ti, Fe−Mn−Zr > Fe−Mn−Ce, Fe−Mn−Ni > Fe−Mn−Co > Fe−Mn−Cu, Fe−Mn. The maximum NOx capacity reached 42−45 mg/g of sorbent for the Fe−Mn−Ti and Fe−Mn−Zr oxides. SO2 and CO2 decreased the NOx adsorption amount only slightly. H2O decreased the NOx adsorption significantly, but the inhibition was reversible. TPD profiles indicated that NOx species could desorb at temperatures below 400 °C. The high efficiency for NO removal on these oxides was related to their high activities in NO oxidation to NO2 at 25 °C. FTIR spectra showed that the nitrate was the final species for NO adsorption. NO2 and nitrite were the interme...
107 citations
TL;DR: Nitrogen-doped magnetized hydrochar (mSBHC-N) was synthesized, characterized, and used for the removal of post-transition and transition heavy metals, viz.
107 citations