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yingxingwang银虫 (小有名气)
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[求助]
二甲醚的文献
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The FT-IR results are shown in Fig. 3. The peaks at around 710,530 and 463 cmÀ1 are characteristic of cryptomelane and are in-volved in the vibrations of the MnO6 octahedral framework[12,25,26]. The peak positions for M-OMS-2 slightly shifted to higher wavelength of 712, 530, 469 cm-1 when compared to those of OMS-2. Fig. 4 shows the nitrogen adsorption–desorption isotherms of the catalysts and the specific surface areas of the catalysts are listed in Table 1. It can be seen from Table 1 that the doping of metals has little impact on the surface areas of the M-OMS-2 catalysts.The isotherms show a characteristic of type II isotherm pattern, with a hysteresis loop of type H3 in the IUPAC classification, which is usually associated with the adsorption on aggregates of particles with a layered morphology, forming slit-like pores [27]. The results are similar to those of the reported K-OMS-2 and Ti-OMS-2 [17]. The TEM images of the M-OMS-2 catalysts are shown in Fig. 5(the image of Cr-OMS-2 is shown in Supplementary data, Fig. S2).All the M-OMS-2 catalysts show a rod-like morphology with a length ranging from 50 to 220 nm and a diameter of about 13 nm. No agglomerated particles corresponding to the doped metal oxide were found. |
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爱与雨下: 金币+1 2013-03-31 14:05:49
yingxingwang: 金币+20, 翻译EPI+1, ★★★很有帮助 2013-04-01 18:33:06
爱与雨下: 金币+1 2013-03-31 14:05:49
yingxingwang: 金币+20, 翻译EPI+1, ★★★很有帮助 2013-04-01 18:33:06
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傅里叶变换红外光谱结果如图3.顶点大约在710530和463.1是锰钾矿的特征峰，包含在MnO6八面体结构中。 M-OMS-2的位置与OMS-2相比轻微的向712530469偏移。图4是催化剂氮气吸附脱附等温线，催化剂的表面积在表1.从表1可以看出金属杂质对M-OMS-2催化剂表面积几乎没有影响。等温线是 II 型等温线，有一个滞环，这通常与吸附剂的聚集有关，形成类似空穴结构。这与K-OMS-2 Ti-OMS-2的文献结果报道一致。 M-OMS-2催化剂的tem图片在表5.（Cr-OMS-2的照片在附表2）。所有的M-OMS-2催化剂显示具有长度50到220nm和直径13nm的棒状型态 在改性金属氧化物中没有发现团聚颗粒。 |
2楼2013-03-31 11:12:13