25067-58-7Relevant academic research and scientific papers
Thermal decomposition of quinoline and isoquinoline. The role of 1-indene imine radical
Laskin, Alexander,Lifshitz, Assa
, p. 928 - 946 (1998)
The thermal reactions of quinoline and isoquinoline were studied behind reflected shock waves in a pressurized driver single pulse shock tube over the temperature range 1275-1700 K and densities of ～3 ×10-5 mol/ cm3. The decomposition products found in the postshock mixtures of quinoline and isoquinoline and their production rates were identical for both isomers. They were C2H2, C6H5CN, HC≡CCN, C6H6, HCN, C6H5-C≡CH and C4H2. Trace quantities of C6H4, C5H5N and C5H4N-C≡CH were also found. The total disappearance rates of quinoline and isoquinoline are the same, and in terms of a first-order rate constant they are given by ktotal = 1013.0exp(-75.5 × 103/RT) s-1 where R is expressed in units of cal/(K mol). The same product distribution in the two isomers can be accounted for if the production of 1-indene imine radical as an intermediate is assumed. A kinetic scheme containing the reactions of both quinoline and isoquinoline with 72 species and 148 elementary reactions accounts for the observed product distribution. The reaction scheme is given, and the results of computer simulation and sensitivity analysis are shown.
Thermal Reactions of Cyclic Ethers at Hygh Temperatures. 1. Pyrolysis of Ethylene Oxide Behind Reflected Shocks
Lifshitz, Assa,Ben-Hamou, Halm
, p. 1782 - 1787 (1983)
The pyrolysis of ethylene oxide highly diluted in argon was studied behind reflected shocks in a single pulse shock tube.The temperature range covered was 830-1200 K and total pressures behind the shocks varied between 1.5 and 10 atm.Over this temperature range up to four orders of magnitude variation in the rate of production of the various reaction products could be determined.C2H6, CH4, C2H4, C2H2, C3H8, CH3CHO, and H2 were determined as a function of temperature, total density, and initial ethylene oxide concentration.It was shown that the main channel of pyrolysis is the ethylene oxide-acetaldehyde isomerization to yield upon decomposition methyl and formyl radicals as well as methane and carbon monoxide.The production of ethylene and acetylene could not be explained on the basis of the isomerization channel.Rupture of the C-O bond in ethylene oxide by H atom substitution is suggested to account for the production of these products.
Reactions of tetraethoxysilane vapor on polycrystalline titanium dioxide
Jurgens,Rogers Jr.
, p. 731 - 743 (1995)
The reactions of tetraethoxysilane (TEOS) vapor on dehydroxylated and water predosed polycrystalline TiO2 were studied by Fourier transform infrared spectroscopy (FTIR) and temperature-programmed desorption (TPD). Exposure at 300 K leads to dissociative adsorption producing a monoethoxysilyl ligand and surface ethoxide species. The ethoxide ligands react and desorb in the range 450-650 K as gas phase ethanol and ethylene, while the monoethoxysilyl ligand decomposes at approximately 650 K to gas phase ethanol and ethylene and surface bound SiO2. Dissociation of TEOS on TiO2 is not affected by water predose; although, a greater amount of ethanol is produced in the gas phase at 550-650 K, and the SiO2 which is formed exhibits vibrational features characteristic of a hydroxylated species. TEOS chemistry on TiO2 was compared to the adsorption and reaction of ethanol on the same surface. Adsorption of ethanol at 300 K yielded surface ethoxide species which desorbed in two states as the parent alcohol and ethylene; desorption was also centered at 450 and 650 K. These results complement and supplement our previous study of TEOS on a TiO2(110) single crystal surface.
Preliminary study on cogeneration of carbon nanotubes and C2 hydrocarbon in CH4/H2 corona discharge
Yu, Kailu,Ruan, Guoling,Ben, Yuheng,Zou, Jijun
, p. 894 - 895 (2006)
La-doped carbon nanotubes and valuable C2 hydrocarbon (C 2H2 and C2H4) are simultaneously generated in CH4/H2 corona discharge. The analysis of off gas indicates that the addition of anodic alumina membrane shows no influence on plasma methane conversion reactions. Copyright
Excellent effect of lithium-doped sulfated zirconia catalysts for oxidative coupling of methane to give ethene and ethane
Murata, Kazuhisa,Hayakawa, Takashi,Fujita, Ken-Ichi
, p. 221 - 222 (1997)
Li-doped sulfated zirconia catalysts are found to be effective for oxidative coupling of methane; ca. 80% C2 selectivity is attained at 1073 K with 43% CH4 conversion.
Microwave Effects on the Oxidative Coupling of Methane over Proton Conductive Catalysts
Chen, Changlin,Hong, Pinjie,Dai, Shushan,Kan, Jiade
, p. 1179 - 1180 (1995)
The oxidative coupling of methane over proton conductive catalysts irradiated by microwaves is reported.Compared with a conventional heating mode, the temperature of the catalytic bed is lower with microwave irradiation and there is a change in both the product selectivity and in the product species formed.We believe this is to be the first reported change in product species using microwave energy in a catalytic reaction.
The high-resolution infrared spectrum of diacetylene and structures of diacetylene, triacetylene and dicyanoacetylene
McNaughton, D.,Bruget, D. N.
, p. 11 - 26 (1992)
The ν6 and ν8 combination band of diacetylene has been remeasured at 0.0019 cm-1 resolution with a Fourier transform infrared spectrometer.Analysis and assignment of the improved data sets were carried out with an interactive Loomis-Wood fitting program.Altogether more than 1400 assignments were made and band origins, rotational and distortion constants for the main band and associated hot bands were determined.The band centre was found to be 1241.060828(37) cm-1 and the ground-state rotational and distortion constants, B0 and D0, were found to be 0.14641021(52) cm-1 and 1.6085(49)*10-8 cm-1, respectively.The experimental values of B0 for diacetylene, triacetylene and dicyanoacetylene are compared with values predicted from ab initio calculations, and with values obtained from estimates derived from the known structural parameters of HC3N and HC5N.Several very weak difference bands, 110901, 110801 and 410601, and combination bands, 510610 and 110910 in the region 3600-2600 cm-1 were also assigned.
Reaction of ethylene with clean and carbide-modified Mo(110): Converting surface reactivities of molybdenum to Pt-group metals
Frühberger,Chen
, p. 11599 - 11609 (1996)
A comparative investigation of the surface reaction of ethylene with clean Mo(110) and carbide-modified Mo(110) has been carried out using high-resolution electron energy loss spectroscopy (HREELS) and temperature programmed desorption (TPD). As typically observed for early transition metals, the clean Mo(110) surface interacts very strongly with ethylene, as indicated by the decomposition of ethylene to produce C2H2 surface species at temperatures as low as 80 K. The surface acetylene species further decompose to atomic carbon and hydrogen at higher temperatures. The strong reactivity of the Mo(110) surface can be modified by the formation of carbide. The surface reactivity is modified in such a way that the reaction mechanism of ethylene on C/Mo(110) is very similar to those typically observed on Pt-group metal surfaces: At 80 K, ethylene molecules bond to the C/Mo(110) surface in the di-σ bonded configuration; a new surface reaction intermediate, which can be best described as ethylidyne species, is detected in the temperature range of 260-350 K. In addition, the interaction of ethylene with oxygen-modified Mo(110) is also compared to reveal the different modification effects of carbon and oxygen adatoms on the reactivities of Mo(110). The oxygen-modified Mo(110) surface is found to be inert toward the decomposition of ethylene, as indicated by the formation of weakly adsorbed π-bonded ethylene species at 80 K and by the reversible molecular desorption at higher temperatures.
Main Gaseous Products of Microwave Discharge in Various Liquid Hydrocarbons
Averin,Lebedev, Yu. A.,Tatarinov
, p. 331 - 335 (2019)
Abstract: Main gaseous products (H2, C2H2, C2H4, CH4) formed by microwave discharge in a number of liquid alkanes, cycloalkanes, and aromatic hydrocarbons have been studied using gas chromatography. It has been shown that the products of the discharge in these cycloalkanes and aromatic compounds bearing no side groups almost do not contain methane or ethylene, unlike the case of alkanes.
Compact solid oxide fuel cells and catalytic reformers based on microtubular membranes
Popov, Mikhail P.,Maslennikov, Daniel V.,Gainutdinov, Igor I.,Gulyaev, Igor P.,Zagoruiko, Andrey N.,Nemudry, Alexander P.
, p. 167 - 170 (2019)
AC heated oxygen-permeable microtubular membranes with the composition Ba0.5Sr0.5Co0.78W0.02Fe0.2O3-δ were used to provide catalytic reforming of methane into C2- hydrocarbons. The methane conversion degree about 60% and acetylene yield about 27% at 1200 °C was achieved. Microtubular solid oxide fuel cells based on gadolinium-doped ceria with perovskite-like cathode material composed of Ba0.5Sr0.5Co0.75Mo0.05Fe0.2O3-δ were prepared. The MT-SOFC demonstrates maximum power densities of 50, 100, 200 mW/cm2 at 550, 600, 650 °C, respectively with humidified H2 as fuel and ambient air as oxidant.
