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| 1 | 以钙钛矿型复合氧化物为前驱体构筑La-Ce氧化物修饰的Pt-Co纳米双金属催化剂及其对CO氧化的性能显示文摘利用钙钛矿型复合氧化物(PTO)可以将多种金属离子限域并均匀混合于钙钛矿晶格中的特点,提出了一种构筑氧化物修饰的纳米双金属催化剂团簇的新构想。以担载于大比表面积SiO 2上的钙钛矿型复合氧化物La1-y Cey Co0.87 Pt0.13 O3/SiO 2作为前驱体,将La、Ce、Co和Pt多种金属离子均匀混合并限域于PTO晶粒中,还原后得到Pt-Co/La-Ce-O/SiO 2催化剂;通过氮气吸附-脱附、XRD、H2-TPR和TEM等手段对Pt-Co/La-Ce-O/SiO 2催化剂进行了表征,考察了其对CO氧化的催化性能,研究了构效关系。结果发现,La-Ce-O-Pt-Co构成了纳米团簇,担载于SiO2表面,形成了Pt-Co纳米双金属颗粒;Co修饰Pt提高了其催化活性,而添加Ce进一步改善了其催化性能。当Ce含量(y)为0.2时,催化剂La0.8 Ce0.2 Co0.87 Pt0.13 O3/SiO2的活性最佳,在120℃下即可实现CO完全转化,且在含体积分数15%H 2O及12.5%CO 2的气氛中仍具有较好的催化性能。稳定性测试表明,所制得的Pt-Co/La-Ce-O/SiO 2催化剂具有良好的稳定性和抗烧结性能。 | 张智敏 张成相 安康 刘强 张斯然 刘源 | 2019 | 燃料化学学报2019，47，11： | 2 |
| 2 | Highly Dispersed Pd Nanoparticles Supported on Zr-Doped MgAl Mixed Metal Oxides for 2-Ethylanthraquinone Hydrogenation显示文摘In this study,Pd-Mg(Al)-LDH/γ-Al2O3 and Pd-Mg(Al)Zr-LDH/γ-Al2O3 precursors were synthesized by impregnating Na2PdCl4 on Mg(Al)-LDH/γ-Al2O3 and Mg(Al)Zr-LDH/γ-Al2O3,and then the precursors were calcinated and reduced to obtain Pd-Mg(Al)-MMO/γ-Al2O3 and Pd-Mg(Al)Zr-MMO/γ-Al2O3 catalysts.Compared with Pd/γ-Al2O3 catalyst,the hydrogenation efficiency of Pd-Mg(Al)-MMO/γ-Al2O3 and Pd-Mg(Al)Zr-MMO/γ-Al2O3 increased by 15.7%and 24.0%,respectively.Moreover,the stability of Pd-Mg(Al)Zr-MMO/γ-Al2O3 catalyst was also higher than that of Pd/γ-Al2O3.After four runs,the hydrogenation efficiency of Pd/γ-Al2O3 decreased from 12.1 to 10.0 g/L,while that of Pd-Mg(Al)Zr-MMO/γ-Al2O3 decreased from 15.0 to 14.3 g/L.The active aquinones selectivities of all catalysts were almost 99%.The structures of the catalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),N2 adsorption–desorption,inductively coupled plasma-atomic emission spectrometry(ICP-AES),CO chemisorption analysis,transmission electron microscopy(TEM),temperature-programmed reduction with hydrogen(H2-TPR),and X-ray photoelectron spectroscopy(XPS).The results indicate that the improved catalytic performance is attributed to the stronger interaction between Pd and Mg(Al)Zr-MMO/γ-Al2O3,smaller Pd particle size and higher Pd dispersion.This work develops an effective method to synthesize highly dispersed Pd nanoparticles based on the layered double hydroxides(LDHs)precursor. | Yunhao Wang Kaige Gao Chenliang Ye Ang Li Cuili Guo Jinli Zhang | 2019 | Transactions of Tianjin University2019，25，6： | 1 |
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