Application of 13161-30-3, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C¨CH bond functionalisation has revolutionised modern synthetic chemistry. 13161-30-3, Name is 2-Pyridinol-1-oxide, SMILES is OC1=CC=CC=[N+]1[O-], belongs to pyridine-derivatives compound. In a article, author is Tada, Shotaro, introduce new discover of the category.
Novel hydrogen chemisorption properties of amorphous ceramic compounds consisting of p-block elements: exploring Lewis acid-base Al-N pair sites formed in situ within polymer-derived silicon-aluminum-nitrogen-based systems
This paper reports the relationship between the H-2 chemisorption properties and reversible structural reorientation of the possible active sites around Al formed in situ within polymer-derived ceramics (PDCs) based on an amorphous silicon-aluminum-nitrogen (Si-Al-N) system. Al-modified polysilazane, as a ceramic precursor, was first pyrolyzed at 1000 degrees C under flowing ammonia to generate a Si-Al-N-based ceramic. XRD and HRTEM analyses confirmed the amorphous state of the titled ceramics. N-2 adsorption-desorption isotherm measurements and HAADF-STEM observation of amorphous SiAlN indicated that Al-incorporation in the early step of the process led to the generation of micro/mesoporosity in the amorphous ceramic with nanopores of 1 to 4 nm in size. XPS and pyridine sorption infra-red spectroscopy analyses revealed the in situ formation of Lewis acidic Al sites within the amorphous Si-Al-N surface network. As a result, the Si-Al-N compound was highly moisture sensitive. Then, to investigate the intrinsic properties of the highly reactive Al sites, the Si-Al-N compound was pretreated at 400-800 degrees C under an inert atmosphere. Temperature-programmed-desorption (TPD)-mass spectroscopy analysis of the pre-treated sample after H-2 treatment above 100 degrees C resulted in the detection of a broad H-2 desorption peak at around 100 to 350 degrees C. The H-2 desorption peak intensity apparently increased when H-2 treatment was performed at 150 degrees C, and the activation energy for H-2 desorption was determined to be 44 kJ mol(-1). Al-27 MAS NMR spectroscopic analysis for the pre-treated sample showed reversible local structure reorientation around reactive Al nuclei, and formation and deformation of 5-fold coordinated Al by H-2 chemisorption and desorption, respectively. In addition, the CO2 hydrogenation reaction on the pre-treated sample was successfully demonstrated by TPD measurements after exposure to a mixed gas of H-2 and CO2 with a 4 : 1 ratio at 400 degrees C. These results suggest that highly distorted 4-fold coordinated Al serves as a Lewis acid-base Al-N pair site to promote H-2 chemisorption at T > 100 degrees C followed by formation of a hydrogenated 5-coordinated Al unit where CO2 hydrogenation proceeds at T = 400 degrees C.
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Reference:
Pyridine – Wikipedia,
,Pyridine | C5H5N – PubChem