甲烷

The research results show for low Sn concentrations, for example 1wt%Sn with respect to Ni, the Ni/Sn surface alloy is energetically preferred. We have also used XPS to characterize the catalysts. The quantified Sn and Ni XP spectra for Ni/Sn/SLT catalysts show that Sn preferentially segregates to the surface of the Ni/Sn alloy. We demonstrate that supported Ni/Sn alloy catalyst provides significantly higher reforming reactivity and resistance to deactivation via carbon deposition than supported monometallic Ni catalyst both in steam reforming of CH4 and CO_2 dry reforming.

本文以SLT为支撑体，利用Sn对传统的Ni基催化剂进行表面合金化处理，成功制备了Ni/Sn表面合金重整催化剂，将该催化剂用于甲烷和丙烷的CO_2重整和水蒸汽重整反应，研究结果表明，在Sn浓度很低的情况下，例如1wt%Sn含量，从能量角度看更易于形成表面合金，XPS数据也显示Sn更易于富集在Ni/Sn合金催化剂表面。

The pH of water was adjusted to 10 by NaOH aqueous solution, than morpholine was extracted by dichloromethane in water.It had good linearity and high sensitivity, high accuracy.

用NaOH水溶液调整水样pH为10，再用二氯甲烷萃取水中的吗啉，具备线性良好，灵敏度高和准确性高特点。

Carbon dioxide is a by-product of steam reforming of methane, propane or naphtha.

二氧化碳是甲烷，丙烷或石脑油的蒸气重整的一个副产品。

Climate change is being caused by common greenhouse gases such as carbon dioxide, methane and nitrogen dioxide.

气候变化是由一些普遍的温室气体，如二氧化碳，甲烷，二氧化氮等引起的。

Automobiles, heat from homes and businesses, and factories are responsible for about 80% of today's carbon dioxide emissions, 25% of methane, and 20% of the nitrous oxide emissions.

汽车，家庭和企业的热量，和工厂负责80今天的二氧化碳排放量，25％％的甲烷和20％，一氧化二氮的排放量。

Methane and nitrous oxides produced by agriculture account for about 10% of man-made warming.

农业产生的甲烷与一氧化二氮，在人为导致的全球变暖中，占了约10%。

Methane, oxygen and H_2O molecules are activated, ionized and dissociated into active particles such as CH_3~+, O~-, H_2O~+, CH_3, CH_2, CH, H,OH and O, by nonelastic collision with high energy electrons. The particles react with each other in the reactor to synthesize chemically products including gaseous oxy-hydrocarbons.We study the rule of reaction by changing electrical parameter, gas flow etc. Study the conversion of methane, selectivity of gaseous hydrocarbons and yield of methanol under different reaction condition.

针对常规甲烷催化转化和氧化偶联制备含氧化合物的问题，遵循国际化学科学研究前沿"绿色化学"原则，采用自然界存在丰富的CH_4、H_2O和O_2为原料，在绿色友好的常温大气压无任何催化剂的条件下，采用强电场电离放电加速电子及其激励气体分子的极端物理手段，在反应腔体内进行无任何环境污染的非平衡等离子体化学反应，将气体分子激发、电离、离解成CH_4~+、CH_3~+、CH_4~·、H_2O~+、H_2O~·、O_2~+、O(~1D)等活性粒子，生成气态烃及含氧碳氢化合物，整个反应过程实现零污染、零副产品。

Several of the amino acids possess nonpolar R groups that are hydrophobic , and other R groups have hydrophilic character.

一些氨基酸有非极性R基团，它们是疏水性的，而其它的R基有亲水性。甲烷被称为疏水的。

These same ideas also apply to nonpolar molecules such as H2, CH4, CCl4 ,and CO2 see Fig.

这些相同的思想也适用於非极性分子，如氢气，甲烷，四氯化碳和CO2 参见图。

If it is present, it could seep into the crust and escape through the ocean floor.

如果真的存在的话，那么，甲烷就可能渗出地壳，通过海底逸出。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。