Catalytic Action of an Aluminum Oxide Catalyst

Enhancement of emission efficiency of colloidal CdSe quantum dots on silicon substrate via an ultra-thin layer of aluminum oxide

“…To understand these results, note that Al oxide is an amphoteric material (can act as an acid or base) and widely used as a catalyst for various chemical reactions including those mediated by light [27][28][29][30][31]. It can be used as a support material to enhance the visible light photocatalytic activity of other materials (e.g., Fe 2 O 3 , ZrO 2 , TiO 2 , etc) for applications such as efficient degradation of organic pollutants [32,33], and to enhance the performance of semiconductor devices such as solar cells, metal oxide semiconductor (MOS) gates, etc [34,35].…”

Role of Brønsted Surface Acid Sites of B2O3–Al2O3 Catalyst Supports in Perylene Radical Cation Formation Studied by Probe EPR with TEMPO Radicals

“…Alumina-based catalysts − and anion-modified alumina − have been widely used in catalytic processes requiring the presence of acid sites. An important characteristic of these catalysts is the concentration and ratio of two different acid sites, i.e., Brønsted (BAS) and Lewis acid sites (LAS), which determine the yields and selectivity of the target and byproduct formation in catalytic reactions.…”

Efficient synthesis of 1-iodoalkynes via Al2O3 mediated reaction of terminal alkynes and N-iodosuccinimide

“…Subsequently, we probed different solvents including DMF, THF, EA, MeOH and hexane, but those solvents resulted in poor yields of desired product (entry [7][8][9][10][11]. Moreover, the reaction was investigated by varying the amount of Al 2 O 3 and NIS to enhance the performance of the reaction (Table 1, entry [12][13][14][15]. With 1.0 equivalents of NIS, the reaction generated 81% yield of 1-iodoalkyne 3aa (entry 12).…”

“…With 1.0 equivalents of NIS, the reaction generated 81% yield of 1-iodoalkyne 3aa (entry 12). However, when higher or lower amount of Al 2 O 3 was used, low yields of the desired product were observed (entry [13][14][15]. Finally, the best conditions to obtain the 1-iodoalkyne 3aa were treatment of 1aa with 1.1 equivalents of NIS, 1.3 equivalents of neutral g-Al 2 O 3 and 4 A MS in CH 3 CN at 80 C for 1 h. With the optimized conditions in hand, we also studied the halogenation of phenyl acetylene 1aa and used various halogenated reagents, including N-bromosuccinimide, 1,3-dibromo-5,5dimethylhydantoin, pyridinium tribromide and N-chlorosuccinimide.…”