查询词典 catalysts

The Pd-Cu/C catalysts were shown to have the face centered cubic crystal structure. This could indicate that the addition of Cu shortened the Pd-Pd distances in the crystal lattice, and therefore –HO(subscript 2ads) and O-O could be better adsorbed on the surface of the catalyst. When NaBH4 was used as the reducing agent, and the atomic ratio of Pd to Cu was 3:1, the resulting catalysts had an average particle size of 3. 4nm and showed the best catalytic performance. The electrochemical active surface are a of Pd3Cu/C was 38.9m^2/gPd and the oxidation reduction reaction activity of the Pd3Cu/C catalyst was much higher than that of the Pd/C catalyst. The electrochemical activity of the Pd3Cu/C catalyst was comparable to that of a commercial Pt/C catalyst.

结果表明：催化剂中Pd与Cu的物质的量之比与预设值相近，Pd和Cu基本被全部还原；Pd-Cu/C催化剂为面心立方结构，元素铜的加入使催化剂的Pd-Pd间距缩小，从而HO(下标 2 ads)和OO键能更好地吸附在催化剂金属表面；当采用NaBH4为还原剂，Pd与Cu物质的量比为3：1时，催化剂(Pd3Cu/C)的平均粒径为3.4 nm，催化剂的催化性能最好，电化学活性表面积EAS达到38.9平方公尺/gPd，电化学性能较Pd/C催化剂有很大提高，接近Pt/C商用催化剂。

It provides important information for the study on FCC catalysts and the mechanism of coking on catalysts.

这些结果对研究催化裂化催化剂的性能和结炭的机理提供了重要信息。

There were hundreds of catalysts from the first single inorganic acid to current heterogeneous catalysts such as metallic oxide, heteroatom molecular sieve and heteropoly acid catalyst.

目前已见报道的催化剂已不下百种，其发展过程从最初单一的无机酸和无机盐类催化剂，发展到非均相的金属氧化物、杂原子分子筛、杂多酸盐催化剂等。

The membrane electrode assemblies with the different Pt/C catalysts were prepared with the coating and hot-press method, and the effect of Pt loading on the electrocatalytic activity of Pt/C catalysts was studied, too.

将获得的催化剂通过涂膜－热压法制备成DMFC膜电极，研究了Pt载量对甲醇电催化氧化性能的影响。

In this dissertation, series of compound catalysts and supported catalysts were prepared respectively by co-precipitation and impregnation method.

本文采用共沉淀法和浸渍法分别制备了非均相复合催化剂和负载型复合催化剂，研究了制备条件对催化剂活性的影响。

Solid acid catalysts have been found to be useful catalyst in a variety of organic reactions. They have many advantages, such as non-toxic, inodorous, non-volatile; non-corrosive, non-pollution, mild reaction conditions, high yields and reactivity, excellent stability and simple work-up procedure, and these are what liquid catalysts cant replace.

固体酸催化剂在有机合成反应中应用广泛，这类催化剂无毒无味，不挥发，不污染环境，不腐蚀设备，容易回收，可重复使用，所催化的反应条件温和，产率和选择性高，后处理简便，且具有独特的催化性能，这些是液体催化剂所不能代替的。

Pd-Pb-Bi/ CaCO3 catalysts were prepared by impregnation for the selective hydrogenation of dehydrolinalool to linalool. The activity of the catalysts with different Pd content was inspected.

采用浸渍法制备了Pd-Pb-Bi/CaCO3催化剂，考察了钯质量分数对催化剂活性的影响，并对催化剂加氢性能进行了评价。

Pb and Fe as promoters, Pd/CaCO3 Lindlar catalysts were modified by impregnation method of fractional steps on unique supports. The new catalysts were prepared for one-step oxidative esterification of methacrole to continuously synthesis methyl methacrylate.

以Pb、Fe为助剂用分步浸渍法在特制的载体上改性Pd/CaCO3催化剂，制备了用于甲基丙烯醛一步氧化酯化液相连续法制备甲基丙烯酸甲酯的新型催化剂。

The experimental results show great catalytic performance, and compared with monometallic catalysts, bimetallic catalysts exhibit more excellent photocatalytic reduction activity and selectivity.

实验结果证明光催化反应能快速且有效的降解硝酸盐，且负载复合金属之光催化剂比单金属拥有更高的催化活性及产氮气选择性。

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。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。