Synthesis and characterisation of Al2O3 nanoparticles as catalyst prepared by polymer co-precipitation method

Abstract

Alumina (Al 2 O 3) is a very interesting material with broad applicability as a support for various catalytically active phases and ceramic materials. Aluminium oxide (Al 2 O 3) nanoparticles were synthesized by aluminium chloride hexahydrate as precursor and polyvinylpyrrolydon (PVP) as surfactant and polymer agent. The samples were characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electron dispersive spectroscopy (EDS). XRD pattern exhibited gamma-Al 2 O 3 to alpha-Al 2 O 3 structural phase transition in the samples. The mean diameter of sphere-like as-prepared nanoparticles was around 26 nm and mean diameter of annealed sample was around 10 nm as estimated by XRD technique and direct HRTEM observation. The surface morphological studies from SEM depicted the size of alumina decreases with increasing annealing temperature. The effect of PVP surfactant on the morphology of the alumina nanoparticles has been investigated. EDS showed peaks of aluminium and oxygen in prepared Al 2 O 3 .

Ionothermal Synthesis of Metal Oxide-Based Nanocatalysts and Their Application towards the Oxidative Desulfurization of Dibenzothiophene

“…e exhibited peaks correspond to the (012), (104), (110), (113), (024), (116), (018), (214), and (300) of a rhombohedral structure of α-Fe 2 O 3 , which is in agreement with the standard data. Notably, the calcination of iron oxide NPs at high temperature (above 500°C) is known to produce a pure α-Fe 2 O 3 phase [34].…”

Anchoring of CoHFC nanoparticles on clinoptilolite for remedy of nuclear wastes

“…Our in ves ti ga tion re volves around nat u ral clinoptilolite, with mi cro-pores which was used as a car rier of metal ferrocyanides nanoparticles as a mineral sup port [20]. Po tas sium co balt hexacyanoferrate par ti cles were in cor po rated in the po rous ma trix of zeolites by suc ces sive im preg na tion with Co(NO 3 ) 2 and K 4 Fe (CN) 6 . In fact, me chan i cal sta bil ity and high sur face area of clinoptilolite are com bined with high ad sorp tion ca pac ity and se lec tiv ity of co balt ferrocyanide to ob tain an im proved ad sor bent.…”

“…Syn thetic and nat u ral nanomaterials have been widely used as adsorbents, ion exchangers, mo lec u lar sieves and mem branes [1][2][3][4][5][6][7]. Clinoptilolite, a widely avail able nat u ral ze o lite is crys tal line, hy drated al kali and al ka line earth-alu mi no sili cate hav ing an in fi nite, three di men sional, open struc ture [8].…”

New colorimetric method to determine catalase mimic activity

“…The physical and chemical properties are affected by the type method used for preparation of nanoparticles, for example uniformity, crystallinity, and size [13,14]. Fe 2 O 3 has different crystal structure for example wustite, hematite, maghemite, and magnetite which summarize as FeO, α-Fe 2 O 3 , β-Fe 3 O 4 and ɣ-Fe 3 O 4 respectively [15][16][17]. Fe 2 O 3 nanoparticles have the advantage of low cost and environmental harmlessness, MnO 2 and Fe 2 O 3 , two very low-cost metal oxides and MnO 2 :Fe 2 O 3 are widely used in many applications such as supercapacitor [18].…”