氢

The recent growing up of chemistry of hydrogenases, especially the Fe-only hydrogenase have renewed interest in classical organometallic diiron dithiolate complexes.

近几年发展起来的氢化酶化学，尤其是唯铁氢化酶活性中心的化学模拟研究，把铁硫簇化学的研究推向了又一高潮。

Further treatment of the Ru nanoparticles with chiral modifier (1S, 2S)-1, 2-diphenyl-1, 2-ethylene-diamirse (1S, 2S-DPEN and KOH in ionic liquid/i-PrOH mixed solvent resulted in a novel immobilized chiral catalyst which can asymmetrically hydrogenate acetophenone and its derivatives.

将此钌纳米粒子与(1S， 2S)-1，2-二苯基乙二胺（简称(1S， 2S)-DPEN）、KOH在离子液体／异丙醇介质中原位生成一种不对称加氢催化剂，用于催化苯乙酮及其衍生物的不对称加氢反应。

Therefore, the study of the preparation of high active catalystsfor hydrogenation is of great significance .

这些都涉及到油脂的催化加氢，因此研究制备高活性的工业加氢催化剂具有重要的意义。

The effects of temperature and catalyst concentration on hydrogenation activit...

同时讨论了该氢化体系的温度和催化剂的浓度对氢化活性和选择性的影响。

A kinetic model of fat and oil hydrogenation is given in this paper.

给出了油脂氢化反应中活化态氢与甘三酯分子反应的动力学模型。

Using above Test Results,A204GrA hydrogenator with austenitic stainless steel overlay was assessed.This hydrogenator can be safely used above 0 5Mo steel operating limit in Nelson Curve and will not be hydrogen attack during the period of insp...

利用以上试验结果，分析了一台位于Nelson 曲线中不安全区的A204GrA 钢加氢反应器，表明在不锈钢堆焊层的作用下，该反应器在检验周期内不会发生氢腐蚀

The transition metal carbides were a new class of catalysts which had good catalytic activity and selectivity and were widely used in hydrogenolysis,dehydrogenation,desulfidation,denitrification,reforming,and other hydrocarbon conversion reactions.

过渡金属碳化物作为一种催化新材料得到了人们广泛的关注，在催化加氢、脱氢、脱硫、脱氮和重整等方面，表现出优良的催化活性和选择性。

Nevertheless, due to the increase of the surface area and activity, the possibility of hydrogenolysis also increases so that more chloroform are generated with the use of nano-scale particles than with the micro-scale particles.

然而由於尺寸缩小，反应活性亦加大，奈米锡在水中对氢离子的竞争性提升，因此加强了氢解反应的发生机率，造成奈米化金属系统三氯甲烷的产率较粉末状金属系统高出许多。

Adding Cr in the catalyst enhances the selectivity to benzaldehyde (from 85.6 to 91.2％ at 400℃). Cu or Ti is very beneficial for the hydrogenation of methyl benzoate to toluene or the hydrogenolysis of methyl benzoate.

Cr调变的催化剂提高了甲醛选择性(在400℃，从85.6提高到为91.2％)，Cu和Ti调变的催化剂则显示较高的苯甲酸甲酯深度加氢活性，即氢解活性。

The yields were better when DHPCE with nitro group in meta or ortho position of the benzene ring were hydrolyzed in basic conditions, while the hydrogenolysis and acidic reactions gave very poor yields.

当苯环的间位和对位存在硝基，碱性水解时，在二氢吡啶环的3位引入氯乙醇的酯能得到较好的收率；酸性水解和氢解法则不宜用来合成ADHPA。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。