Zinc Oxide (ZnO): an Amphoteric Metal Oxide with Dehydrogenating Activity

[摘要] Zinc oxide (ZnO) is an available, affordable, and nontoxiccompound with significant applications in various transformations.1 Its major use is found in rubber industry as vulcanizing activator,2 however, is also employed as pigment,food additive, and as a component of consumer goods suchas ceramics, plastics, or cosmetics.3 This last application isexplained because it is a broad-spectrum UV absorber andpresents antibacterial properties.1 Moreover, ZnO has interesting electrical properties as it is, indeed, a wide band gapsemiconductor. Hence, many reports have described theutility of ZnO in electrochemical devices or solar cells.4 Dueto its multiple uses, many syntheses have been describedfor ZnO.5 In a small laboratory scale, ZnO can be easily obtained upon heating any Zn2+ salt in the presence of water,while in the industry is synthesized by well-known pyrometallurgical or hydrometallurgical processes. Ultimately,ZnO as a 99% powder can be purchased below 100 €/kgfrom different suppliers and also as nanoparticle dispersionin water.

[学科分类] 精神健康和精神病学

[关键词] catalysis;hydrogen transfer;heterogeneous catalysis;heterocycles;acceptorless dehydrogenative condensation