The mechanism of the HCN formation from ammonia and methane over Pt black was investigated using a temporal analysis of products (TAPs) reactor system. At 1173 K the hydrogen cyanide production rate depends on the order of introducing the reactants. HCN is formed rapidly on the methane pulse just after introducing ammonia. However, a slow formation of HCN is observed on the ammonia pulse that follows a methane pulse. Moreover the form of the HCN response resembles closely that of the nitrogen and hydrogen also released during the ammonia pulse. Thus, the rate-determining step for the formation of HCN is the decomposition rate of ammonia. A reaction sequence based on elementary steps is proposed for the HCN synthesis. The formation of HCN after pulsing H 2 points to a pool of surface intermediate species that are hydrogenated to HCN. #
The LnOCl (Ln = Y, Lu) compounds have been successfully co-intercalated by Li and THF
molecules. Infrared spectroscopy and atomic absorption spectroscopy agree with the
formulation Li
x
(THF)
y
LnOCl (Ln = Y, Lu; x ranging from 0.07 to 0.37). Characterizations
by means of X-ray powder diffraction shows that these products are isotypic with the
superconducting Li
x
(THF)
y
MNCl (M = Zr, Hf) compounds (T
c up to 25.5 K). Band structure
calculations performed for YOCl and ZrNCl indicate that the bottom of the conduction band
is similar for both compounds. However, from magnetic susceptibility measurements none
of the Li
x
(THF)
y
LnOCl (Ln = Y, Lu) compounds were found to be superconducting down to
2 K.
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