|
|
|
|
|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
|
|

| | A series of V-P-O catalysts in the range of P/V ratio = 0.9, 1.0, 1.1, with different calcination temperature and calcination atmosphere for n-butane oxidation to maleic anhydride were prepared by the method of benzyl alcohol reduction. Crystal phases of the catalysts were determined by XRD and FT-IR. The average valence of vanadium in the catalysts was determined by chemical titration. It was considered that the main factor which was related to seclectivity i... | | 测定了一系列V-P-O催化剂的丁烷选择氧化总转化率、顺酐选择性和生成速率。用XRD和FT-IR仪对催化剂进行晶相分析。用化学滴定法测定催化剂中钒的平均价态。结果表明,晶形良好的(VO)_2P_2O_2和部分α-VOSO_4的混合物可能是丁烷选择氧化的必要活性相。 | | 文摘来源 | | Vanadium oxide nanotubes (VO x-NTs) were synthesized in a rheological phase reaction followed by self-assembling process and characterized by XRD, SEM, TEM, Raman, ESR, TG-DTA, XPS, and simulated battery. The results show that the black products consist majority of VO x-NTs with length of 1—10 μm and diameter of 30—100 nm, whose walls consist of 3—10 VO x layers with interlayer distance of 3.53 nm. Raman spectrum indicates the stretching or bending vibration of... | | 采用流变相 -纳米自组装新方法合成了钒氧化物纳米管 ( VOx-NTs) ,并通过 XRD,SEM,TEM,Raman,ESR,TG-DTA,XPS及模拟电池等技术手段对产物的结构和性能进行了表征和测试 .结果表明 ,产物主要由钒氧化物纳米管组成 ,纳米管长为 1~ 1 0 μm,直径为 3 0~ 1 0 0 nm.纳米管壁由 3~ 1 0个 VOx 层构成 ,层间距为 3 .5 3 nm.Raman光谱反映了 V— O的伸缩或弯曲振动 ,层状微结构的晶格振动及模板剂的有机基团振动 .无明显精细结构的室温 ESR谱证明了 V4 +的存在 ,根据 TGA和 XPS求得产物中 V的平均化合价约为 + 4 .3 0 .VOx-NTs正极材料初始充电容量达到 40 4m A.h/g,放电容量为 3 83 m A.h/g,5 0次循环后放电容量衰减至 1 80 m A.h/g,可归因于充放电过程中 VOx-NTs正极材料在电解液中的溶蚀作用及复合电极中“孤岛效应”的产生 | | 文摘来源 | |   |
|
相关查询: | |
对查询结果不满意
|
|
|
|