NiO microspheres with tunable porosity and morphology effects for CO oxidation

NiO microspheres with tunable porosity and morphology effects for CO oxidation
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具有可调孔隙率和形态效应的 NiO 微球对 CO 氧化的影响

DOI:
10.1039/c1cy00131k
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发表时间:
2011-08
期刊:
Catalysis Science & Technology
影响因子:
--
通讯作者:
Li, Yingxia
Li, Yingxia
中科院分区:
其他
文献类型:
--
作者:
Xiao, Junjia;Chen, Biaohua;Liang, Xin;Zhang, Runduo;Li, Yingxia

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采用简单的溶剂热法制备了孔隙率可调的层状NiO花状微球。主要通过调节硝酸镍的浓度制备了三种不同孔隙率的NiO微花(NiO-A、NiO-B和NiO-C)。这些花状微球由密集堆积的不规则片状组成,在介孔和大孔区都显示出广泛的多峰孔分布。NiO-A、NiO-B和NiO-C的比表面积分别为59.9m2g−1、50.2m2g−1和15.1m2g−1。NiO-A、NiO-B和NiO-C的孔容分别为0.2214 cm~3 g−~1、0.0829 cm~3 g−~1和0.0549 cm~3 g−~1。这些NiO微球对CO氧化催化表现出很强的形态依赖性。与传统的NiO纳米粒子相比,这些花状NiO微球对CO氧化具有更好的催化活性。
Hierarchiral NiO flower-like microspheres with tunable porosity were prepared based on a facile solvothermal method. Three kinds of NiO micro-flowers (NiO-A, NiO-B, and NiO-C) with different porosity have been fabricated mainly by tuning the concentration of nickel nitrate. These flower-like microspheres are comprised of densely packed irregular sheets and display a multi-peaks pore distribution in a wide range in both mesoporous and macroporous regions. The BET surface area of NiO-A, NiO-B and NiO-C is 59.9 m2 g−1, 50.2 m2 g−1 and 15.1 m2 g−1, respectively. The pore volume of NiO-A, NiO-B and NiO-C is 0.2214 cm3 g−1, 0.0829 cm3 g−1 and 0.0549 cm3 g−1, respectively. These NiO spheres show a strong morphology dependant nature for CO oxidation catalysis. Compared to the conventional NiO nanoparticles, these flower-like NiO micro-spheres possess a superior catalytic activity for CO oxidation.
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