化學(xué)中金屬/C 表示什么意思？求速答，急用謝謝了！

RW家的傾城歌 2011-03-15 02:29:54 273 瀏覽

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xj134567 2011-03-16 00:00:00

應(yīng)該是金屬負(fù)載在活性炭上制備的催化劑，真暈。

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白羊林風(fēng) 2011-03-16 00:00:00

如果是在有機(jī)化合物中，這種東西是做催化劑的，應(yīng)該是金屬或化合物附著在CaCO3上，做催化劑用。

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yawei7 2011-03-18 00:00:00

金屬附著在CaCO3上制備的催化劑

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化學(xué)中金屬/C 表示什么意思？求速答，急用謝謝了！:

各向同性和各向異性究竟是什么意思？求速答:

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國標(biāo)中維生素限量n和c表示什么意思:

求翻譯段英文合同，謝謝了。: The exhaust air from the kitchen shall be cleaned as sufficient as possible over the place of generation by an aerosol separator accommodated in the hood. The aerosol separators shall be easily accessible， easy-to-demount and cleanable in a... The exhaust air from the kitchen shall be cleaned as sufficient as possible over the place of generation by an aerosol separator accommodated in the hood. The aerosol separators shall be easily accessible， easy-to-demount and cleanable in a dish washer. To this end they shall be made of chromium nickel steel only. The rate of flow recommended by the manufacturer for the separator shall be kept. Knit fabric filters and plug-on grille filters as the only aerosol separators shall not be used. The exhaustion hoods in the kitchens which are arranged on top of kitchen equipment and used to collect vapor and steams quickly shall be designed such that a sufficiently high retaining capacity is achieved. Kitchen exhaust air hoods shall at least 0.2 m protrude over the circumference on top of the kitchen appliance. If the lower edge of the hood is higher than 2.10 m on top of the floor， a higher protrusion shall be provided (angle of opening = 12° from the edge of working areas). Collection chutes shall be free from burr and arranged such at all sides that they can be drained via drains. Hoods of chromium nickel steel with integrated lighting only shall be used as exhaustion hoods. If outdoor air lines to kitchens or other rooms are passed through fire sections， they shall be equipped with suitable and approved fire protection flaps or the pipeline shall be provided with a fire protection lining from the outlet of the room. The fire protection flaps used shall be tested and approved for the relevant case of application. Exhaust air channels shall be made of fire-resistant material. Specific measures are required for the use of gas heated large-size kitchen equipment in order to ensure the necessary supply of combustion air on the one hand and to ensure reliable exhaust gas dissipation on the other. If kitchen exhaust air and exhaust gases of gas appliances are fed off commonly， an additional safeguard shall be provided. This safeguard shall switch off the gas fired equipment if the exhaust air system fails. The high exhaust gas temperatures shall be taken into account when selecting the hood structure. In any case， gas equipment shall be operated only if the room air system is in operation. 展開

化學(xué)專業(yè)英語·翻譯·謝\(^o^)/YES！: Fig. 1 illustrates the microstructure and surface morphology of samples which include the bare substrate， the fluorinated with and without CeO2 thin film. Fig. 1a shows the initial surface state of the polished bare substrate. Some fine ste... Fig. 1 illustrates the microstructure and surface morphology of samples which include the bare substrate， the fluorinated with and without CeO2 thin film. Fig. 1a shows the initial surface state of the polished bare substrate. Some fine steaks resulting from the polishing progress are visible in the image. The surface is considerably rough and the activity of surface for magnesium alloy is various from sample to sample and within the same sample due to the presence of different phases [24，25]. In Fig. 1b， the micrograph was taken when the sample was fluorinated in the 20% HF for 20 h. There are a large number of pores and cracks on the surface of this sample; however， we cannot find the presence of remarked grinding scratches originated from the sample preparation on the surface in contrast with the bare substrate. It is well known that the magnesium alloy reacts with HF to form the fluoride coating via displacement reaction and the fluoride is insoluble， thus form a barrier on the surface of magnesium alloy. The pores and cracks distributed uneven also suggest that the activities on the surface of magnesium alloy are not very identical. The SEM image of the fluorinated sample with CeO2 thin film is shown in Fig. 1c. As can be seen from this image， most of the pores and cracks existed on the surface of the fluorinated sample have disappeared which is ascribed to the presence of CeO2 thin film. Moreover， the surface of CeO2 thin film is more uniform and more compact than that of the fluorinated sample， and this may explain why this kind of samples is the best corrosion resistant. XPS analysis is performed aiming at identifying the chemical composition of the film and the typical survey scan spectra are shown in Fig. 2. The main element peaks of Mg， C， O， F and Ce are shown in the spectra. A significant amount of carbon is present on the surface of the sample due to some contaminant that originates from the polishing， cleaning and heat-treatment procedure; moreover， there may be some remnant since the deficiently burning for celloidin during the heat-treatment. There are three peaks in the survey scan spectra as follows: Mg 2p3/2 at about 50 eV， Mg 2s at about 88 eV and Mg Auger peak at about 301 eV. The peak of Mg 2p around 50 eV is shown in Fig. 2 which reveals only one peak at 50.2 eV belonging to Mg 2p being the fingerprint for Mg2+ in the transitional region. Hence， it is most probable that the presence of Mg in the coating is a result of the formation of MgF2 in the course of the fluorinated process and the formation of MgO during the heat-treatment. Both the main components of O 1s peak located at 530.6 eV and the F 1s peak located at 684.7 eV give the evidence that the major states are MgO and MgF2. It is found that almost a pure Ce(IV) state in the spectrum of CeO2 and this is similar to these reported by ?koda et al. [26]. 展開