Co3O4 particles grown over nanocrystalline CeO2: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Wu H.; Pantaleo G.; Di Carlo G.Guo S.Marci G.Concepcion P.Venezia A. M.Liotta L. F.

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Co3O4 particles grown over nanocrystalline CeO2: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

机译：在纳米晶体CEO上生长的CO3O4颗粒：沉淀剂和钙化温度对甲烷氧化的催化活性的影响

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Crystalline cobalt oxides were prepared by a precipitation method using three different precipitation agents, (NH4)(2)CO3, Na2CO3 and CO(NH2)(2). Cobalt oxide nanoparticles corresponding to a Co3O4 loading of 30 wt% were also deposited over high-surface area nanocrystalline ceria by the same precipitation agents. The effect of calcination temperature, 350 or 650 degrees C, on the morphological and structural properties was evaluated. Characterization by BET, XRD, SEM, TEM, Raman spectroscopy, H-2-TPR, XPS and NH3-TPD was performed and the catalytic properties were explored in the methane oxidation reaction. The nature of the precipitation agent strongly influenced the textural properties of Co3O4 and the Co3O4-CeO2 interface. The best control of the particle size was achieved by using CO(NH2)(2) that produced small and regular crystallites of Co3O4 homogeneously deposited over the CeO2 surface. Such a Co3O4-CeO2 system precipitated by urea showed enhanced low-temperature reducibility and high surface Co3+ concentration, which were identified as the key factors for promoting methane oxidation at low temperature. Moreover, the synergic effect of cobalt oxide and nanocrystalline ceria produced stable full conversion of methane in the entire range of investigated temperature, up to 700-800 degrees C, at which Co3O4 deactivation usually occurs.

机译：使用三种不同的沉淀剂（NH4）（2）CO3，Na2CO3和CO（NH2）（2）使用降水法制备晶钴氧化物。与相同的降水剂在高表面区域纳米晶体陶瓷上还沉积了对应于30 wt％CO3O4载荷的钴氧化物纳米颗粒。评估了钙化温度为350或650度C对形态和结构特性的影响。通过BET，XRD，SEM，TEM，拉曼光谱，H-2-TPR，XPS和NH3-TPD进行表征，并在甲烷氧化反应中探索了催化特性。降水剂的性质强烈影响CO3O4和CO3O4-CEO2界面的质地特性。使用CO（NH2）（2）实现了粒径的最佳控制，该CO（2）产生了在CEO2表面上同质沉积的CO3O4的小且规则的晶体。这种由尿素沉淀的CO3O4-CEO2系统显示出增强的低温可还原性和高表面CO3+浓度，被确定为在低温下促进甲烷氧化的关键因素。此外，在研究的整个温度范围内，氧化钴和纳米晶的二氧化碳的协同作用通常会在整个调查的温度范围内完全转化，最高为700-800摄氏度，通常会发生CO3O4脱氧。

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《Catalysis science & technology》 |2015年第3期|1888-1901|共14页
作者
Wu H.; Pantaleo G.; Di Carlo G.Guo S.Marci G.Concepcion P.Venezia A. M.Liotta L. F.;
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Univ Palermo, Schiavello Grillone Photocatalysis Grp, Dipartimento Energia Ingn Informaz & Modelli Mate, I-90128 Palermo, Italy;

CNR, ISMN, I-90146 Palermo, Italy;

CNR, ISMN, I-00015 Rome, ItalyUPV CSIC, Inst Tecnol Quim, Valencia 46022, Spain;

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正文语种英语
中图分类汉语教学;
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calcination temperature; Oxidation; precipitationmethaneNanocrystallineinclined plate and tube settlerParticle SizeAgentsChemical Precipitationcobalt oxidesCatalyst activity;

机译：钙化温度;氧化;沉淀甲烯烯丙烯酸酯板和试管固定颗粒sizeagents化学沉淀量氧化物氧化降低的活性;

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1. Pd/CeO2–TiO2 catalyst for CO oxidation at low temperature：a TPR study with H2 and CO as reducing agents [O] . Huaqing Zhu, Zhangfeng Qin, 单文娟, 2004

机译：pd/CeO2–TiO2 catalyst for CO oxidation at low temperature：a TpR study with H2 and CO as reducing agents

Co3O4 particles grown over nanocrystalline CeO2: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

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