نتایج جستجو برای: h2co separation
تعداد نتایج: 123473 فیلتر نتایج به سال:
Small organic molecules, such as C2H, HCN, and H2CO, are tracers of the C, N, O budget in protoplanetary disks. We present high angular resolution (10-50 au) observations H2CO lines five disks from Molecules with ALMA at Planet-forming Scales (MAPS) Large Program. derive column density excitation temperature profiles for HCN find that emission arises a temperate (20-30 K) layer disk, while C2H ...
We report production rates for H2O and eight trace molecules (CO, C2H6, CH4, CH3OH, NH3, H2CO, HCN, C2H2) in the dynamically new, Sun-grazing Comet C/2012 S1 (ISON), using high-resolution spectroscopy at Keck II and the NASA IRTF on 10pre-perihelion dates encompassing heliocentric distances Rh=1.21–0.34 AU. Measured water production rates spanned two orders of magnitude, consistent with a lo...
The selective oxidation of CH3OH to H2CO over the noble metals Cu, Ag and Au represents one of the oldest industrial catalytic technologies dating back to the 1880s [1,2] and also the first non-Pt based catalytic industrial process. Initially, the catalyst employed for methanol oxidation was metallic Cu and subsequent research three decades later comparing the noble different metal catalysts fo...
ABSTRACT H2O:CO, at concentrations of (3:2) and (10:1), was condensed on CsI substrate 15 K irradiated with 46-MeV 58Ni11 + ion beam. Radiolysis induced by fast heavy ions analyzed infrared spectroscopy (FTIR). The formation nine molecular species: CO2, H2O2, HCOOH, HCO, H2CO, 13CO2, CH3OH, O3, C3O2 observed. For both concentrations, carbon dioxide (CO2), formaldehyde (H2CO), formic acid (HCOOH...
Context. The 4.8 GHz formaldehyde (H2CO) masers are one of a number rare types molecular in the Galaxy. There still is not agreement on mechanism responsible for inversion 110−111 transition and conditions under which an can occur, therefore how to interpret masers.
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