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After evacuating the reaction system and re-running the experiment, almost identical gas production rates were achieved in the second as well as third runs. More than 7,200 p,mol gases evolved(H2, about 4,800 μmol; and O2, about 2,400μmol) during the course of a 400-h experiment. The catalyst samples remained unchanged during the course of reaction, suggesting that thephotocatalytic activity is stable under visible Light irradiation. The turnover number-the ratio of total amount of gas evolved to catalyst (1,412 μmol in our system)一exceeded 5 after 400 h reaction time. The turnover number in terms of reacted electrons relative to the amount of Ni loaded on the surface of the sample and Ni doped in InTaO4 reached 39 at 400h reaction time,indicating that the reaction occurs catalytically. Wavelength dependence of the photocatalytic gas evolution on the photocatalyst was investigated using different cut-off filters. As a comparison, the Pt/TiO2 photocatalyst (P-25) was measured using the same method. Although photocatalytic activity was observed when using Inl-xNixTaO4 and a cut-off filter of λ>500 nm, it is much lower than that observed under λ>420 nm light irradiation.The rates of H2 and O2 evolution were 1.91 and 0.86 μmolh-1 on In0.9Ni0.1TaO4 respectively, under λ>500 nm Light irradiation. The activity disappeared when the wavelength of light irradiation was larger than 550 nm. The results are in good agreement with the observation of diffuse reflectance spectra (see Fig. 3). By contrast, no photocatalytic activity was obtained on Pt/TiO2 under visible light irradiation (λ>420 nm). X-ray diffraction analysis showed that there is no observable structural difference between the samples before and after reaction. Full-profile structure refinement of XRD data was performed using the Rietveld program REITf1N12, showing that all samples crystallize in the same wolframite structure, monoclinic with space group P2/a, and that the lattice parameters decrease along all three axes as the Ni content χ is increased, as long as χ<0.15. Figure 4 shows the change of V/Z with doping content, where V and Z are cell volume and the number of formulas per cell, respectively. The inset shows the c-axis parameter as a function of Ni content, to illustrate the lattice parameter changes induced by doping. There is a linear decrease of V/Z with increasing Ni content as long as χ<0.15, while V/Z has a small expansion when the Ni content χ>0.15. In compounds with a Ni-doping content greater than 0.2, an impurity phase, NiTa2O6, appears and increases its volume fraction significandy with increasing Ni content. It is known13 that the structural stability of oxides consisting of octahedra such as ABO3, can be estimated by calculating the tolerance factor defined as t=(rA+r0)/ (rB+r0)，where rA, rB and r0 are the radii of the respective ions. 0.79 |
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zhaosenkuaku
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落步生花: 金币+15, 翻译EPI+1, ★★★很有帮助, 谢谢 2013-01-29 10:15:35
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将反应体系抽真空并重新运行实验后，几乎相同的产气率，实现了在 第二以及第三的运行。超过7,200 P，摩尔释出气体（H2，约4800微摩尔和O2，约2400微摩尔）的400-H实验过程中。催化剂样品在反应过程中保持不变，这表明thephotocatalytic活性可见的光照射下是稳定的。的营业额有多少的气体总量的比例演变为催化剂（1,412微摩尔在我们的系统中），一超过5 400小时后的反应时间。在400h的反应时间的营业额的Ni的量的表面上的样品和Ni中掺杂InTaO4加载相对于反应的电子数达到39，表明发生反应催化。 上的光催化剂的光催化气体逸出的波长依赖性的研究了使用不同截止滤光片。 Pt/TiO2光催化剂（P-25）作为比较，使用相同的方法测定。虽然光催化活性得到使用INL-xNixTaO4和λ> 500nm的截止滤光器时，观察到的，它是远低于下观察λ> 420nm的的光irradiation.The H2和O2演化率分别为1.91和0.86μmolh 1对 In0.9Ni0.1TaO4，λ> 500 nm的光照射下。 “ 活性消失时的波长的光照射的时间是 大于550纳米。漫反射光谱（见图3）观察结果吻合得很好。相比之下，没有 适宜在可见光照射下（λ> 420 nm）的光催化活性。 X-射线衍射分析表明，存在是没有可观察到的样本之间的反应之前和之后的结构上的差异。剖面结构的X射线衍射数据进行细化的里特维尔德程序REITf1N12，显示，所有样品的结晶，在相同的黑钨矿结构，单斜晶系，空间群为P2 /年，晶格参数减小沿三个轴的Ni含量χ增加时，只要为χ<0.15。图4示出的变化掺杂的内容，其中，V和Z是细胞体积和每个细胞的数目的配方，分别与V / Z。插图示出的c-轴参数作为Ni含量的函数，来说明通过掺杂引起的晶格参数的变化。有一个线性只要增加Ni含量减少的V / Z，χ<0.15，而V / Z有一个小的膨胀时，Ni的含量χ> 0.15。在掺杂的Ni含量大于0.2，杂质的化合物与 相，NiTa2O6，出现，随着Ni含量的增加，并增加其体积分数significandy。这是known13通过计算定义为糖耐量因子，如ABO 3的氧化物组成的八面体结构的稳定性，可估计 吨=（rA的+为r0）/（rB型+为r0），其中RA，RB和r0是各自的离子半径。 0.79 |
2楼2013-01-28 18:42:26
hillatmsu
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帮你翻译一段吧 抽空反应系统后并重复进行实验时，第二次和第三次反应的气体生成速度几乎相同。在400小时的实验过程中，产生的气体超过7,200 p,mol（氢气约4,800 μmol; 氧气约2,400μmol）。在反应中，催化剂样品没有发生变化，说明催化剂的光催化活性在可见光辐射下是稳定的。反应400小时候的转换数，也就是生成的气体总量和催化剂用量（在我们的系统中是1,412 μmol）的比例，超过了5。如以反应了电子数与负载在样品表面的以及进入到InTaO4中的Ni总量之间的比例来衡量转换数，则该值在400小时之后达到了39，这说明这个反应是由通过催化进行的。 |
3楼2013-01-28 18:55:33
4楼2013-01-29 14:26:40