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首页> 外文期刊>Catalysis science & technology >Solubility product difference-guided synthesis of Co3O4-CeO2 core-shell catalysts for CO oxidation
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Solubility product difference-guided synthesis of Co3O4-CeO2 core-shell catalysts for CO oxidation

机译：溶度积difference-guided合成Co3O4-CeO2核壳催化剂对CO氧化

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摘要

It is still an important issue to develop a facile, environmentally friendly way to synthesize bimetal oxide materials. In this paper, Co3O4-CeO2 core-shell catalysts were prepared by an interfacial reaction, where Co(CO3)(0.35)Cl-0.2(OH)(1.1) nanorods were dispersed in Ce3+ aqueous solution for 2 days, followed by a calcination step. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Based on the characterization and comparative experimental results, we proposed that the OH- ions slowly dissociated from the Co(CO3)(0.35)Cl-0.2(OH)(1.1) precursor combined with Ce3+ to develop into Ce(OH)(3) nanoparticles because of its smaller solubility product constant than that of the Co precursor or Co(OH)(2). Neither an additional precipitation agent nor stabilizing molecules were employed during the whole preparation. Raman spectroscopy and H-2-temperature programmed reduction (H-2-TPR) analysis revealed that there is a synergistic effect between Co3O4 and CeO2 in the as-prepared Co3O4-CeO2 core-shell catalysts, which is responsible for their enhanced catalytic activity toward CO oxidation in comparison to pure Co3O4 and CeO2.
机译：发展仍然是一个重要的问题肤浅的,环保的方式合成双金属氧化物材料。纸,Co3O4-CeO2核壳催化剂由一个界面反应,有限公司(二氧化碳)(0.35)cl - 0.2(哦)(1.1)纳米棒分散在Ce3 +水溶液为2天,其次是煅烧的一步。以x射线衍射(XRD)、透射电子显微镜(TEM)和x射线光电子能谱(XPS)。描述和比较实验结果,我们提出,氢氧根离子缓慢分离的公司(二氧化碳)(0.35)cl - 0.2 (OH) (1.1)前体结合Ce3 +发展成Ce (OH)(3)纳米颗粒由于其小溶度积常数比有限公司(2)前体或公司(哦)。沉淀剂也不稳定分子整个制备过程中了。光谱和H-2-temperature编程(H-2-TPR)分析显示,减少是Co3O4之间的协同效应,CeO2的好Co3O4-CeO2核壳催化剂,负责提高催化活动对CO氧化相比纯Co3O4 CeO2。

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