Photocatalytic Conversion of Nitric Oxide on Titanium Dioxide: Cryotrapping of Reaction Products for Online Monitoring by Mass Spectrometry

Lu, Weigang
Olaitan, Abayomi D.
Brantley, Matthew R.
Zekavat, Behrooz
Altunöz Erdoğan, Deniz
Ozensoy, Emrah
Solouki, Touradj
Details of coupling a catalytic reaction chamber to a liquid nitrogen-cooled cryofocuser/triple quadrupole mass spectrometer for online monitoring of nitric oxide (NO) photocatalytic reaction products are presented. Cryogenic trapping of catalytic reaction products, via cryofocusing prior to mass spectrometry analysis, allows unambiguous characterization of nitrous oxide (N2O) and nitrogen oxide species (i.e., NO and nitrogen dioxide (NO2)) at low concentrations. Results are presented, indicating that the major photocatalytic reaction product of NO in the presence of titanium dioxide (TiO2) P25 and pure anatase catalysts when exposed to ultraviolet (UV) light (at a wavelength of 365 nm) is N2O. However, in the presence of rutile-rich TiO2 catalyst and UV light, the conversion of NO to N2O was less than 5% of that observed with the P25 or pure anatase TiO2 catalysts.


Silver Nanoparticles Synthesized by Microwave Heating: A Kinetic and Mechanistic Re-Analysis and Re-Interpretation
Özkar, Saim (American Chemical Society (ACS), 2017-12-14)
A quantitative kinetics and mechanistic re-analysis is performed of an important 2016 paper that described the formation of Ag-n nanoparticles from the polyol reduction of silver nitrate in the presence of poly(N-vinylpyrrolidone) under microwave heating. Elegantly and expertly obtained, in operando synchrotron high-energy X-ray diffraction (HEXRD) data, integrated with the microwave heating for the first time, were used to follow the Ag-n nanoparticle formation reaction in real time and to obtain time-reso...
Conjugation effects on carrier mobilities of polythiophenes probed by time-resolved terahertz spectroscopy
Esentürk, Okan; Deongchamp, Dean M.; Heilweil, Edwin J. (American Chemical Society (ACS), 2008-07-24)
Optically generated carrier conductivity of thiophene-based spin-cast polymer films, as cast poly(3-hexylthiophene) (P3HT) and both as cast and above liquid crystalline temperature annealed poly(2,5-bis(3tetradecylthiophen-2yl)thieno[3,2-b]thiophene) (PBTTT), were measured by time-resolved THz spectroscopy (TRTS) and compared to reported thin-film transistor (TFT) device measurements. The relative mobilities of the samples measured by TRTS agree well with reported TFl` mobilities. Since TRTS is sensitive to...
Temperature-Induced Activation of Graphite Co-intercalation Reactions for Glymes and Crown Ethers in Sodium-Ion Batteries
Goktas, Mustafa; Akduman, Baris; Huang, Peihua; Balducci, Andrea; Adelhelm, Philipp (American Chemical Society (ACS), 2018-11-29)
The intercalation of solvated ions into graphite leads to ternary graphite intercalation compounds (t-GICs). Here, we study the impact of temperature on the electro-chemical activity of graphite electrodes for co-intercalation reactions between 20 and 80 degrees C in sodium cells. For this, a range of linear ethers (mono-, di-, tri-, and tetraglyme) are studied. For the first time, pentaglyme and several crown ethers are also investigated. We find that several solvents that appear as unsuitable for the co-i...
Interaction of BrPDI, BrGly, and BrAsp with the Rutile TiO2(110) Surface for Photovoltaic and Photocatalytic Applications: A First-Principles Study
Cakir, D.; GÜLSEREN, Oğuz; METE, ERSEN; Ellialtıoğlu, Süleyman Şinasi (American Chemical Society (ACS), 2011-05-12)
The adsorption of perylenediimide (PDI)-based dye compounds (BrPDI, BrGly, and BrAsp) on the defect-free unreconstructed (UR) rutile TiO2(110) surface has been studied using total energy pseudopotential calculations based on density functional theory. All dye molecules form moderate chemical bonds with the defect-free UR rutile (110) surface in the most stable adsorption configurations. Electronic structure analysis reveals that HOMO and LUMO levels of the adsorbed dye molecules appear within the band gap a...
Solid-state synthesis and X-ray diffraction studies of Na2S
Kizilyalli, M.; Bilgin, M.; Kizilyalli, H.M. (Elsevier BV, 1990-4)
Na2S was synthesized by a new solid-gas reaction of Na2CO3 with a sulfidizing gas mixture and a solid-solid reaction of carbon with Na2SO4. The reaction products were analyzed by X-ray powder diffraction and IR methods. Two new crystal modifications of Na2S were identified in addition to the previously reported antifluorite structure. They were designated as cubic Form II and orthorhombic Form III. The approximate unit cell dimensions were found to be a = 11.29 Å for the cubic form and a = 15.94, b = 16.00,...
Citation Formats
W. Lu et al., “Photocatalytic Conversion of Nitric Oxide on Titanium Dioxide: Cryotrapping of Reaction Products for Online Monitoring by Mass Spectrometry,” JOURNAL OF PHYSICAL CHEMISTRY C, pp. 8056–8067, 2016, Accessed: 00, 2020. [Online]. Available: