Synthesis of Flower-Like NiO and Effects of Morphology on Its Catalytic Properties

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Title:	Synthesis of Flower-Like NiO and Effects of Morphology on Its Catalytic Properties
Authors:	Zhao,B;Ke,XK;Bao,JH;Wang,CL;Dong,L;Chen,YW;Chen,HL
Contributors:	化學工程與材料工程學系
Keywords:	NICKEL-OXIDE;THERMAL-DECOMPOSITION;BLOCK-COPOLYMERS;CHEMICAL-SHIFTS;METAL-OXIDES;CO;SURFACE;NO;ROUTE;SIZE
Date:	2009
Issue Date:	2010-06-29 17:28:08 (UTC+8)
Publisher:	中央大學
Abstract:	NiO with novel flower-like morphology was prepared by using a two-step, template- and surfactant-free, environmentally friendly method. Flower-like NiO was composed of many irregular nanosheets that were assembled together by weak interactions. The as-prepared materials were characterized by X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, transmission electron microscopy with selected area electron diffraction patterns, N-2 sorption, temperature-programmed reduction with CO, X-ray photoelectron spectroscopy (XPS), and in situ Fourier transform infrared (FT-IR) for CO adsorption. The catalytic behaviors for CO oxidation were studied by using a fixed bed microreactor. Compared to NiO nanoparticles, we found the flower-like NiO possessed a larger surface area, bimodal pore size distribution, higher reducibility, and superior catalytic activity for CO oxidation. The XPS and CO in situ FT-IR results showed that its catalytic property was morphology dependent. The flower-like morphology provided more coordinate unsaturated Ni atoms, more oxygen vacancies, and more defect sites, which made the flower-like NiO have a strong interaction with CO and more active sites for catalytic reactions. Further studies showed that a mild condition for thermodecomposition of the precursor was necessary to preserve the flower-like morphology because of the large discrepancy of the crystalline cell structures between the beta-Ni(OH)(2) precursor and product of NiO.
Relation:	JOURNAL OF PHYSICAL CHEMISTRY C
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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