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http://ir.lib.ncu.edu.tw/handle/987654321/26441
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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: | [化學工程與材料工程研究所] 期刊論文
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