Synthesis of High Surface Area ZnO(0001) Plates as Novel Oxide Supports for Heterogeneous Catalysts

Abstract

We demonstrate a technique to prepare high surface area ZnO powders that preferentially favor a platelike morphology, exposing the ð0001Þ=ð000 " 1Þ facets. A solution-based synthetic route was used to decompose zinc acetate in the presence of amine and citrate ions to block the ð0001Þ=ð000 " 1Þ facets and favor growth from the pyramid planes. The ZnO platelets remained stable upon heating to 250°C as evidenced by electron diffraction patterns. The high surface area (75 m 2 /g) and surface energetics of the (0001) plane make these powders suitable as supports for heterogeneous catalysts.

Nano-γ-Fe<sub>2</sub>O<sub>3</sub>: Efficient, Reusable and Green Catalyst for <i>N</i>-<i>tert</i>-Butoxycarbonylation of Amines in Water

“…Nano-γ-Fe 2 O 3 particles are considered to be attractive as catalysts for their greater reactivity, due to high surface area, recovered easily from the reaction mixture and reusable for further reaction, therefore the method being more Efficient [21].…”

Nano-Array Integrated Structured Catalysts: A New Paradigm upon Conventional Wash-Coated Monolithic Catalysts?

“…Within the first 24 h, the relatively smooth surfaces turned into zigzag periodic and rough nanowires, the pore volume dropped by~46%, and the Brunauer-Emmett-Teller (BET) surface area decreased from 8 m 2 /g to 4 m 2 /g. Compared to the surface area decrease in conventional powder-type catalysts, ZnO, TiO 2 , and Co 3 O 4 nano-array catalysts showed much higher thermal stability [33][34][35].…”

Porous ZnO platelets via controlled thermal decomposition of zinc glycerolate

“…Since the availability of ZnO with platelet-like morphology is limited till now [12][13][14][15][16][17], and while such a material with nonisotropic morphology could be highly interesting with concern to its catalytical, optical and electronical properties, the question arises whether thermal decomposition of platelet-like Zn(gly) can be performed while maintaining its morphology. To this concern, as-prepared Zn(gly) was decomposed with fast, moderate and slow heating rates inside of a tube furnace.…”

“…Non-isotropic morphologies such as platelets are less often observed although they could be highly relevant for thin-films that exhibit an oriented reflection of light or a directed electrical conductivity. Such platelet-like ZnO has been yet gained by physicochemical techniques such as electrochemical deposition [12], radio-frequency sputtering [13], ultrasonic spray pyrolysis [14] as well as by applying long-chained amines/carboxylates for a structure-directed growth in solution [15][16][17].…”