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: In this article, the selective catalytic reduction (SCR) of NO x (NO and NO 2 ) by NH 3 was investigated using the in situ DRIFTS, which showed that NO could be adsorbed on the catalyst and formed different kinds of nitrates at 150°C, which almost converted to the stable bidentate and bridged nitrates in the presence of O 2.
121 citations
TL;DR: In this paper, a citrate-nitrate auto combustion method was used to synthesize nano-powders of pure and Al-doped TiO 2 ceramics.
Abstract: Nano-powders of pure and Al-doped TiO 2 ceramics were synthesized using a citrate–nitrate auto combustion method. Powders were then used to make thick film gas sensors to measure selectivity and sensitivity in CO and O 2 environment. Titanyl nitrate solution was prepared using commercial TiO 2 powder, hydrofluoric acid (HF) and concentrated nitric acid (HNO 3 ). An optimized ratio of citrate to nitrate was used to produce TiO 2 nanoparticles. Powder X-ray diffraction data showed that synthesized TiO 2 nano-powders, pure as well as Al-doped, had stable anatase phase up to 800 °C. X-ray fluorescence confirmed the Al concentrations in synthesized nano-powders. BET surface area analysis showed a decrease at 5 wt.% Al addition, followed by an increase at 7.5 wt.% in specific average surface area. Particle size analysis showed particles below 100 nm for both pure and doped TiO 2 even after calcination at 800 °C. The resistance of Al-doped TiO 2 samples was found to be lower than that of pure TiO 2 in O 2 and CO environment. Al-doped TiO 2 gas sensors were more selective and sensitive to CO and O 2 at an operating temperature of 600 °C than pure TiO 2 powders.
121 citations
TL;DR: In this article, a facile sol-gel method was used to obtain WO3/TiO2 composites with different compositions using X-ray diffraction (XRD), BET surface area analysis, electron dispersion spectroscopy (EDS), and photoluminescence (PL) emission spectrum.
121 citations
TL;DR: In this article, a hierarchical meso-macroporous silica monolith template is used to synthesize hierarchically porous carbon monoliths, which can be used as precursors for the synthesis of such monolithic carbons.
121 citations
TL;DR: In this paper, the pore structure of partially saturated cement-based material is analyzed using low-field nuclear magnetic resonance (LFNMR) technique. And the pores of two white cement mortars were characterized using the LFNIR.
121 citations