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Polyhedron lead hydroxide carbonate (2PbCO3·Pb(OH)2 ) microcrystals have been prepared in solution phase via a facile method in the presence of surfactant cetyltrimethylammonium bromide (CTAB). All the samples were characterized by powder X-ray diffraction ,pattern (XRD), field-emission scanning electron mi- croscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED). The possible growth mechanism was discussed. 2PbCO3·Pb(OH)2 microcrystals were found to be a novel and efficient catalyst for the synthesis of diphenyl carbonate (DPC) by transesterification of dimethyl carbonate (DMC) with phenol. Compared with some other catalysts, such as AlCl3, ZnCl2, and Mg5(CO3)4(OH)2, 2PbCO3·Pb(OH)2 microcrystals are stable and show relatively high activity at low catalyst amount. When the reaction was carried out at 180 12, with a molar ratio of phenol to DMC of 2:1, a reaction time 14 h, and a catalyst amount 0.2% (molar ratio to phenol), the selectivity of DPC and methyl phenyl carbonate (MPC) was 14.7% and 78.8%, respectively. 相似文献
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直接在铜基底上生长具有不同金属离子的多孔过渡金属氧化物,成为有前途的锂离子电池电极材料的候选。本文提出了一种简便可行的低温水热沉积方法在铜基底上制备前驱物阵列。前驱物经过煅烧处理得到具有多孔特性Co3V2O8纳米片阵列,多孔纳米片阵列用作锂离子电池负极材料显示出了长期循环稳定性和高倍率性能。在1.0 A/g电流密度下,电池经过240次循环后显示出1 010 mA∙h/g的容量;在3.0 A/g的电流密度下,电池循环600次后显示出552 mA∙h/g的可逆容量。 相似文献
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设计和制备了两类新奇的多金属氧酸盐-二氧化钛光催化剂,即单缺位Keggin结构十一钨磷酸盐(Na7PW11O39)-二氧化钛和单取代Keggin结构十一钨磷酸盐(K5[Ni(H2O)PW11O39]和K5[Co(H2O)PW11O39])-二氧化钛(锐钛矿)杂化孔材料.详细讨论了在紫外光照射下,PW11-TiO2催化降解甲基橙等3种染料,TiO2-APS-PW11Ni和TiO2-APS-PW11Co降解刚果红等4种染料的反应过程和机理. 相似文献
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