نتایج جستجو برای: adsorption ch3oh
تعداد نتایج: 55518 فیلتر نتایج به سال:
A limit on a possible cosmological variation of the proton-to-electron mass ratio is derived from methanol (CH3OH) absorption lines in the benchmark PKS1830–211 lensing galaxy at redshift z 1⁄4 0:89 observed with the Effelsberg 100-m radio telescope, the Institute de Radio Astronomie Millimétrique 30-m telescope, and the Atacama Large Millimeter/submillimeter Array. Ten different absorption lin...
Fracture surface of Zircaloy-2 specimens tested under constant crosshead speed in CH3OH/0.4 Vol. %HCI solution with and without selenium (25 ppm) addition was studied. Using a combined process of deformation and annealing, coarse grained material was also obtained and examined. Two modes of stress corrosion crack propagation were observed: an intergranular zone caused by stress assisted anodic ...
Methanol experimental data are obtained under pyrolysis, fuel lean (φ = 0.75) and stoichiometric mixtures with methane in a flow reactor. Methanol pyrolysis experiments are performed under isothermal conditions of 1073K over a pressure range from 1 to 10 atm. Oxidation environments are performed over a temperature range from 873 1073K and a pressure range from 1 5 atm. Oxidation experiments con...
The reaction of methanol with nearly-stoichiometric and oxygen-terminated surfaces of Cr2O3 was studied using thermal desorption spectroscopy and x-ray photoelectron spectroscopy. Dissociative adsorption of methanol occurs on the nearlystoichiometric surface and is attributed to the availability of cation-anion site pairs. An array of products including CH4, CH2O, CO, CO2, and H2 are produced a...
The influence of the interface in ZnO?ZrO2 catalysts for selective hydrogenation CO2 to CH3OH is investigated. Specifically, we perturbed its structure using two different synthetic methods: surface organometallic chemistry (SOMC) and flame-spray pyrolysis (FSP) investigated speciation resulting materials by spectroscopic techniques, such as XAS, NMR, IR, UV-Vis, EPR. results indicate that oxid...
In this study, the nanofluids are produced by dispersing Al2O3 nanoparticles in the H2O/CH3OH binary mixtures using an ultrasonic equipment. Solid Sodium Chlorides (NaCl) with a fixed mass fraction are dissolved in the binary mixture for CO2 absorption. The main objective of this paper is to measure the thermal conductivity of the Al2O3 nanofluids using the transient hot-wire method. The experi...
To explain the existence and observations of prebiotic molecules in interstellar and protostellar environments, it is first necessary to evaluate the chemical and physical processes that govern the generation, behavior, and destruction of precursor molecules, from which complex prebiotic species are probably formed. In interstellar and protostellar environments, many of these precursor species,...
In this paper we describe the first quantitative search for several molecules in Titan's stratosphere in Cassini CIRS infrared spectra. These are: ammonia (NH3), methanol (CH3OH), formaldehyde (H2CO), and acetonitrile (CH3CN), all of which are predicted by photochemical models but only the last of which has been observed, and not in the infrared. We find non-detections in all cases, but derive ...
The first results from a VLT-ISAAC program on the infrared spectroscopy of deeply-embedded young stellar objects are presented. The advent of 8-m class telescopes allows high S/N spectra of low-luminosity sources to be obtained. In our first observing run, lowand medium-resolution spectra have been measured toward a dozen objects, mostly in the Vela and Chamaeleon molecular clouds. The spectra ...
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