13 research outputs found
The photoconductivity of Cd[sub x]Hg[sub 1βx]Te (x=0.2β0.3) with an aluminum thin-film coating
Modifier effect in silica-supported FePO4 and Fe-Mo-O catalysts for propylene glycol oxidation
Currently, catalytic processing of biorenewable raw materials into valuable products attracts more and more attention. In the present work, silica-supported FePO4 and Fe-Mo-O catalysts are prepared, their phase composition, and catalytic properties are studied in the process of selective oxidation of propylene glycol into valuable mono- and bicarbonyl compounds, namely, hydroxyacetone and methylglyoxal. A comparative analysis of the main routes of propylene glycol adsorption with its subsequent oxidative conversion into carbonyl products is carried out. The DFT calculations show that in the presence of adsorbed oxygen atom, the introduction of the phosphate moiety to the Fe-containing site strengthens the alcohol adsorption on the catalyst surface with the formation of the 1,2-propanedioxy (βOCH(CH3)CH2Oβ) intermediate at the active site. The introduction of the molybdenum moiety to the Fe-containing site in the presence of the adsorbed oxygen atom is also energetically favorable, however, the interaction energy is found by 100 kJ/mol higher compared to the case with phosphate moiety that leads to an increase in the propylene glycol conversion while maintaining high selectivity towards C3 products. The catalytic properties of the synthesized ironcontaining catalysts are experimentally compared with those of Ag/SiO2 sample. The synthesized FePO4/SiO2 and Fe-Mo-O/SiO2 catalysts are not inferior to the silver-containing catalyst and provide ~70% selectivity towards C3 products, while the main part of propylene glycol is converted into methylglyoxal in contrast to the Ag/SiO2 catalyst featuring the selective transformation of only the secondary C-OH group in the substrate molecule under the studied conditions with the formation of hydroxyacetone. Thus, supported Fe-Mo-O/SiO2 catalysts are promising for the selective oxidation of polyatomic alcohols under low-temperature conditions
Cd x Hg1 β x Te-based photodetector with the spectral characteristic controlled by the voltage
Π€ΠΎΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΡΠ΅Π»Π°ΠΊΡΠ°ΡΠΈΠΎΠ½Π½Π°Ρ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΡ ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² GaSe
ΠΠ±Π»Π°Π΄Π°ΡΡΠΈΠ΅ ΡΡΠΊΠΎ Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΠΉ Π°Π½ΠΈΠ·ΠΎΡΡΠΎΠΏΠΈΠ΅ΠΉ ΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΊΡΠΈΡΡΠ°Π»Π»Ρ GaSe ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½Ρ Π΄Π»Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΉ Π² Π½Π΅Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ ΠΎΠΏΡΠΈΠΊΠ΅, ΡΠΎΡΠΎΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΈΠΊΠ΅, ΡΠΎΡΠΎΠ²ΠΎΠ»ΡΡΠ°ΠΈΠΊΠ΅ ΠΈ Ρ. Π΄. ΠΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈ Π°ΠΊΡΠΈΠ²Π½ΡΠ΅ Π΄Π΅ΡΠ΅ΠΊΡΡ Π² Π½ΠΈΠ·ΠΊΠΎΠΎΠΌΠ½ΠΎΠΌ GaSe ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎ ΠΏΠΎΠ΄ΡΠΎΠ±Π½ΠΎ [1-4], Π² ΡΠΎ Π²ΡΠ΅ΠΌΡ ΠΊΠ°ΠΊ ΡΡΠ΅Π±ΡΡΡΠΈΠ΅ΡΡ Π² ΡΡΠ΄Π΅ ΡΠ»ΡΡΠ°Π΅Π² Π΄Π»Ρ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π²ΡΡΠΎΠΊΠΎΠΎΠΌΠ½ΡΠ΅ ΠΊΡΠΈΡΡΠ°Π»Π»Ρ ΠΈΠ·ΡΡΠ΅Π½Ρ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΌΠ΅Π½ΡΡΠ΅. Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈ Π°ΠΊΡΠΈΠ²Π½ΡΡ
Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ² Π² Π²ΡΡΠΎΠΊΠΎΠΎΠΌΠ½ΡΡ
ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»Π°Ρ
GaSe ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠΎΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅Π»Π°ΠΊ-
ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ (PICTS [5]).
ΠΡΠΈΡΡΠ°Π»Π»Ρ GaSe ΠΈΠΌΠ΅Π»ΠΈ p-jvm ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ Ρ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠ΅ΠΉ Π½ΠΎΡΠΈΡΠ΅Π»Π΅ΠΉ Π·Π°ΡΡΠ΄Π° 3 1 ( ) " ΡΠΌ ' ΠΏΡΠΈ 300 Π. ΠΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΊΠΎΠ½ΡΠ°ΠΊΡΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π»ΠΈΡΡ ΡΠ΅ΡΠ΅Π±ΡΡΠ½ΠΎΠΉ ΠΏΠ°ΡΡΠΎΠΉ Π½Π° Π»ΠΈΡΠ΅Π²ΠΎΠΉ (ΠΎΡΠ²Π΅ΡΠ°Π΅ΠΌΠΎΠΉ) ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»Π° - ΠΏΠ»ΠΎΡΠΊΠΎΡΡΠΈ ΡΠΊΠΎΠ»Π°. ΠΠ°ΡΠ΅ΡΡΠ²ΠΎ ΠΊΠΎΠ½ΡΠ°ΠΊΡΠΎΠ² ΠΎΡΠ΅Π½ΠΈΠ²Π°Π»ΠΈ ΠΏΠΎ Π²ΠΎΠ»ΡΡΠ°ΠΌΠΏΠ΅ΡΠ½ΠΎΠΉ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ΅, ΠΊΠΎΡΠΎΡΠ°Ρ Π±ΡΠ»Π° Π»ΠΈΠ½Π΅ΠΉΠ½Π° ΠΏΡΠΈ ΠΊΠΎΠΌΠ½Π°ΡΠ½ΠΎΠΉ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ΅. Π‘Π²Π΅ΡΠΎΠ²ΠΎΠ΅ Π²ΠΎΠ·Π±ΡΠΆΠ΄Π΅Π½ΠΈΠ΅ ΠΏΠ°Π΄Π°Π»ΠΎ ΠΏΠ΅ΡΠΏΠ΅Π½Π΄ΠΈΠΊΡΠ»ΡΡΠ½ΠΎ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»Π°, ΠΏΠ°ΡΠ°Π»Π»Π΅Π»ΡΠ½ΠΎ ΠΎΡΠΈ Ρ. Π‘ΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΡΠΉ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½ Π²ΠΎΠ·Π±ΡΠΆΠ΄Π΅Π½ΠΈΡ Π²ΡΠ±ΠΈΡΠ°Π»ΡΡ ΠΈΠ· ΡΡΠ»ΠΎΠ²ΠΈΡ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΠΎΠΎΡΠΊΠ»ΠΈΠΊΠ° ΠΈ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΎΠ²Π°Π» ΡΠ½Π΅ΡΠ³ΠΈΠΈ ΡΠΎΡΠΎΠ½ΠΎΠ² hv = 1,9-2,0 ΡΠ. ΠΠ»ΠΎΡΠ½ΠΎΡΡΡ ΠΏΠΎΡΠΎΠΊΠ° ΡΠΎΡΠΎΠ½ΠΎΠ² Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΎΠ±ΡΠ°Π·ΡΠ° ΡΠΎΡΡΠ°Π²Π»ΡΠ»Π° lu' ΡΠΌ'^Ρ"'. ΠΠ»Ρ ΠΈΡΠΊΠ»ΡΡΠ΅Π½ΠΈΡ Π²Π»ΠΈΡΠ½ΠΈΡ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΡΡΠΈ ΠΈ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΠΆΠΈΠ·Π½ΠΈ ΡΠ²ΠΎΠ±ΠΎΠ΄Π½ΡΡ
Π½ΠΎΡΠΈΡΠ΅Π»Π΅ΠΉ Π·Π°ΡΡΠ΄Π° ΠΏΡΠΈ ΡΠ°ΡΡΠ΅ΡΠ΅ ΡΠΏΠ΅ΠΊΡΡΠΎΠ² ΡΠΈΠ³Π½Π°Π» ΡΠΎΡΠΎΠΎΡΠΊΠ»ΠΈΠΊΠ° Π½ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π»ΡΡ Π½Π° Π²Π΅Π»ΠΈΡΠΈΠ½Ρ ΡΡΠ°ΡΠΈΠΎΠ½Π°ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΠΎΠΎΡΠΊΠ»ΠΈΠΊΠ°
Π€ΠΎΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΡΠ΅Π»Π°ΠΊΡΠ°ΡΠΈΠΎΠ½Π½Π°Ρ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΡ ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² GaSe
ΠΠ±Π»Π°Π΄Π°ΡΡΠΈΠ΅ ΡΡΠΊΠΎ Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΠΉ Π°Π½ΠΈΠ·ΠΎΡΡΠΎΠΏΠΈΠ΅ΠΉ ΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΊΡΠΈΡΡΠ°Π»Π»Ρ GaSe ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½Ρ Π΄Π»Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΉ Π² Π½Π΅Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ ΠΎΠΏΡΠΈΠΊΠ΅, ΡΠΎΡΠΎΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΈΠΊΠ΅, ΡΠΎΡΠΎΠ²ΠΎΠ»ΡΡΠ°ΠΈΠΊΠ΅ ΠΈ Ρ. Π΄. ΠΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈ Π°ΠΊΡΠΈΠ²Π½ΡΠ΅ Π΄Π΅ΡΠ΅ΠΊΡΡ Π² Π½ΠΈΠ·ΠΊΠΎΠΎΠΌΠ½ΠΎΠΌ GaSe ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎ ΠΏΠΎΠ΄ΡΠΎΠ±Π½ΠΎ [1-4], Π² ΡΠΎ Π²ΡΠ΅ΠΌΡ ΠΊΠ°ΠΊ ΡΡΠ΅Π±ΡΡΡΠΈΠ΅ΡΡ Π² ΡΡΠ΄Π΅ ΡΠ»ΡΡΠ°Π΅Π² Π΄Π»Ρ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π²ΡΡΠΎΠΊΠΎΠΎΠΌΠ½ΡΠ΅ ΠΊΡΠΈΡΡΠ°Π»Π»Ρ ΠΈΠ·ΡΡΠ΅Π½Ρ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΌΠ΅Π½ΡΡΠ΅. Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΈ Π°ΠΊΡΠΈΠ²Π½ΡΡ
Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ² Π² Π²ΡΡΠΎΠΊΠΎΠΎΠΌΠ½ΡΡ
ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»Π°Ρ
GaSe ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠΎΡΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅Π»Π°ΠΊ-
ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ (PICTS [5]).
ΠΡΠΈΡΡΠ°Π»Π»Ρ GaSe ΠΈΠΌΠ΅Π»ΠΈ p-jvm ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ Ρ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠ΅ΠΉ Π½ΠΎΡΠΈΡΠ΅Π»Π΅ΠΉ Π·Π°ΡΡΠ΄Π° 3 1 ( ) " ΡΠΌ ' ΠΏΡΠΈ 300 Π. ΠΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΊΠΎΠ½ΡΠ°ΠΊΡΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π»ΠΈΡΡ ΡΠ΅ΡΠ΅Π±ΡΡΠ½ΠΎΠΉ ΠΏΠ°ΡΡΠΎΠΉ Π½Π° Π»ΠΈΡΠ΅Π²ΠΎΠΉ (ΠΎΡΠ²Π΅ΡΠ°Π΅ΠΌΠΎΠΉ) ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»Π° - ΠΏΠ»ΠΎΡΠΊΠΎΡΡΠΈ ΡΠΊΠΎΠ»Π°. ΠΠ°ΡΠ΅ΡΡΠ²ΠΎ ΠΊΠΎΠ½ΡΠ°ΠΊΡΠΎΠ² ΠΎΡΠ΅Π½ΠΈΠ²Π°Π»ΠΈ ΠΏΠΎ Π²ΠΎΠ»ΡΡΠ°ΠΌΠΏΠ΅ΡΠ½ΠΎΠΉ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ΅, ΠΊΠΎΡΠΎΡΠ°Ρ Π±ΡΠ»Π° Π»ΠΈΠ½Π΅ΠΉΠ½Π° ΠΏΡΠΈ ΠΊΠΎΠΌΠ½Π°ΡΠ½ΠΎΠΉ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ΅. Π‘Π²Π΅ΡΠΎΠ²ΠΎΠ΅ Π²ΠΎΠ·Π±ΡΠΆΠ΄Π΅Π½ΠΈΠ΅ ΠΏΠ°Π΄Π°Π»ΠΎ ΠΏΠ΅ΡΠΏΠ΅Π½Π΄ΠΈΠΊΡΠ»ΡΡΠ½ΠΎ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»Π°, ΠΏΠ°ΡΠ°Π»Π»Π΅Π»ΡΠ½ΠΎ ΠΎΡΠΈ Ρ. Π‘ΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½ΡΠΉ Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½ Π²ΠΎΠ·Π±ΡΠΆΠ΄Π΅Π½ΠΈΡ Π²ΡΠ±ΠΈΡΠ°Π»ΡΡ ΠΈΠ· ΡΡΠ»ΠΎΠ²ΠΈΡ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΠΎΠΎΡΠΊΠ»ΠΈΠΊΠ° ΠΈ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΎΠ²Π°Π» ΡΠ½Π΅ΡΠ³ΠΈΠΈ ΡΠΎΡΠΎΠ½ΠΎΠ² hv = 1,9-2,0 ΡΠ. ΠΠ»ΠΎΡΠ½ΠΎΡΡΡ ΠΏΠΎΡΠΎΠΊΠ° ΡΠΎΡΠΎΠ½ΠΎΠ² Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΎΠ±ΡΠ°Π·ΡΠ° ΡΠΎΡΡΠ°Π²Π»ΡΠ»Π° lu' ΡΠΌ'^Ρ"'. ΠΠ»Ρ ΠΈΡΠΊΠ»ΡΡΠ΅Π½ΠΈΡ Π²Π»ΠΈΡΠ½ΠΈΡ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΡ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΡΡΠΈ ΠΈ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΠΆΠΈΠ·Π½ΠΈ ΡΠ²ΠΎΠ±ΠΎΠ΄Π½ΡΡ
Π½ΠΎΡΠΈΡΠ΅Π»Π΅ΠΉ Π·Π°ΡΡΠ΄Π° ΠΏΡΠΈ ΡΠ°ΡΡΠ΅ΡΠ΅ ΡΠΏΠ΅ΠΊΡΡΠΎΠ² ΡΠΈΠ³Π½Π°Π» ΡΠΎΡΠΎΠΎΡΠΊΠ»ΠΈΠΊΠ° Π½ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π»ΡΡ Π½Π° Π²Π΅Π»ΠΈΡΠΈΠ½Ρ ΡΡΠ°ΡΠΈΠΎΠ½Π°ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΠΎΠΎΡΠΊΠ»ΠΈΠΊΠ°
Silica-supported Fe-Mo-O catalysts for selective oxidation of propylene glycol
Selective oxidation of propylene glycol is studied over silica-supported FeMoO catalysts with different Mo/Fe molar ratio. The catalysts are synthesized by wetness impregnation method and characterized by XRD, UVβvis, Raman spectroscopy, TPR and DFT methods. The catalytic properties are tested under gas phase conditions at 350βΒ°C. The selectivity towards methylglyoxal formation is shown to be determined by the Mo/Fe molar ratio. The 55% selectivity towards methylglyoxal is achieved at Mo/Fe molar ratio of 3:1 through OH activation and CH bond scission route. CC bond cleavage route results in predominant formaldehyde formation at the Mo/Fe molar ratio of 1:2