| 负载于HZSM-5上的CuO-ZnO-Al2O3纳米粒子：尿素－硝酸盐燃烧合成和理化表征(英文) |
| Urea-Nitrate Combustion Synthesis and Physicochemical Characterization of CuO-ZnO-Al2O3 Nanoparticles over HZSM-5 |
| 作者 | 单位 | | Reza Khoshbin | Chemical Engineering Department(化学工程系), Sahand University of Technology(萨罕德工业大学), P.O.Box 51335-1996, Sahand New Town, Tabriz, Iran(伊朗)
Reactor and Catalysis Research Center (RCRC)(反应器和催化研究中心), Sahand University of Technology(萨罕德工业大学), P.O.Box 51335-1996 | | Mohammad Haghighi | Chemical Engineering Department(化学工程系), Sahand University of Technology(萨罕德工业大学), P.O.Box 51335-1996, Sahand New Town, Tabriz, Iran(伊朗)
Reactor and Catalysis Research Center (RCRC)(反应器和催化研究中心), Sahand University of Technology(萨罕德工业大学), P.O.Box 51335-1996 |
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| 摘要: 用尿素－硝酸盐燃烧法制备了一系列的负载于HZSM-5上的CuO-ZnO-Al2O3纳米复合材料(CZA/HZSM-5)。研究了燃料与氧化物的比率对所合成的复合材料的理化性质的影响。用TGA/DTG，FTIR和XRD等研究了尿素－硝酸盐凝胶的热分解和煅烧粉体的相演变过程。FESEM结果表明在燃烧过程中燃料的用量对CZA/HZSM-5的性质有重大影响。CuO和ZnO的晶粒首先随尿素量的增加而增大，然后随尿素量的增加而减小。CuO和ZnO的相对结晶度随燃料量的增加表现为非单调趋势。随着燃料与硝酸盐的比率的增加，CZA/HZSM-5不仅形貌变得超细和均一，而且表面孔隙率也显著增加。FTIR结果表明HZSM-5的结构甚至在负载了CuO-ZnO-Al2O3纳米粒子后也未被破坏，而且在CuO和ZnO与HZSM-5之间还有表面的键合。TGA/DTG 结果指出燃烧合成法是一种由若干过程组合起来的方法，例如前驱体的热分解和前驱体间的放热反应等。另外，提出了CuO-ZnO-Al2O3负载在HZSM-5上的生成机理。 |
| 关键词: ZnO-CuO-Al2O3 HZSM-5 纳米复合材料 尿素-硝酸盐燃烧合成法 |
| 基金项目: |
| Abstract: A series of CuO-ZnO-Al2O3 nanocomposites over HZSM-5(CZA/HZSM-5) have been synthesized by urea-nitrate combustion method. The influence of the fuel to oxidant ratio on the physicochemical properties of synthesized nanocomposites has been studied. The thermal decomposition of urea-nitrate gels and the phase evolution of calcined powder were investigated by TGA/DTG, FTIR and XRD techniques. The FESEM results show that the properties of the CZA/HZSM-5 are significantly influenced by fuel content used in the combustion process. The crystalline size of the CuO and ZnO initially increases with the increase in urea content and then decreases with further addition of urea. The relative crystallinity of CuO and ZnO shows non monotonic trend with increasing of fuel content. With increasing of fuel to nitrate ratio, not only the morphology of the CZA/HZSM-5 becomes ultra-fine and homogeneous, but also the surface porosity increases obviously. FTIR results show that HZSM-5 structure is not damaged even after loading with CuO-ZnO-Al2O3 nanoparticles and there are external linkages between CuO and ZnO with HZSM-5. TGA/DTG curves indicate that the combustion synthesis method is a combination of several phenomena such as thermal decomposition of precursors and exothermal reactions between them. Furthermore, a formation channel of CuO-ZnO-Al2O3 over HZSM-5 was proposed. |
| Keywords: ZnO-CuO-Al2O3 HZSM-5 nanocomposite urea-nitrate combustion |
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| Reza Khoshbin,Mohammad Haghighi.负载于HZSM-5上的CuO-ZnO-Al2O3纳米粒子：尿素－硝酸盐燃烧合成和理化表征(英文)[J].无机化学学报,2012,28(9):1967-1978. |
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