脱锌

Secondly, the silver based catalysts modified by phosphorus, zirconium, zinc, potassium and so on using molecular sieve as carrier, which were produced by ion-exchange method, had also good catalytic performance for 1,2-propane glycol oxidation to methylglyoxal. The conversion of 1,2-propane glycol and the selectivity of methylglyoxal were both high, and the impurity such as formaldehyde and acetaldehyde in the product is little. At the condition of the temperature 300 ℃, the molar ratio of oxygen to 1,2-propane glycol 1.7:1, the space velocity 6000h~(-1), and the concentration of 1,2-propane glycol 70wt%, the conversion of 1,2-propane glycol is 90% and the selectivity of methylglyoxal is 45% on the Ag-P catalyst.

其次对采用离子交换法制备的负载在分子筛上的银系催化剂进行了研究，发现此催化剂在助催化剂磷、锆、锌、钾等的作用下对丙二醇的低温氧化脱氢具有很高的活性，可以得到较好的丙酮醛的收率，并且产物中的甲醛、乙醛副产物的量比较低；经过对Ag-P催化剂上反应条件的考察，发现当温度为300℃、氧醇比1.7：1、空速6000h~(-1)、丙二醇浓度为70wt%时，丙二醇的转化率为90%，丙酮醛的选择性为45%。

The reactions include, organometallic reactions (grignard reaction, organolithium -zinc, and -copper chemistry ), metal catalyzed reactions, mannich reaction, nitration, hydrogenation, azidation, amino-protection reactions, organoalluminum catalyzed beckmann rearrangement, schmidt rearrangement, epoxidation, epoxide ring opening reactions, swern oxidation etc.

这些反应包括：有机金属反应(格利亚反应，有机锂，有机锌和有机铜反应)，金属催化反应堆(suzuki 反应， negish 反应)， mannish 反应，硝化反应，氢化反应，叠氮反应，各种基团的保护和脱保护反应，有机铝催化的贝克曼重排反应，斯密特重排反应，环氧化反应，环氧烷开环反应， swern 氧化反应等。

5 The pinacol coupling reaction of aromatic aldehydes and ketones was performed in 8-95% yield with magnesium in 0. 1M aqueous NH4CI.

2.4 以蒙脱土K10和锌的体系中，在超声波作用下，研究了醛、酮的还原偶联反应，于22～30℃反应2～3小时，产率23～91％。

The results showed that: the zinc powder could be used to reductively dechlorinate pentachloropyridine to tetrachloropyridine with its yield about 20%. Under the catalytic effect of silver, the dechlorination efficiency of pentachloropyridine was greatly improved.

实验结果表明：反应温度为60 ℃时，单一锌粉能够对五氯吡啶进行还原脱氯生成四氯吡啶，但是收率不高，只有20%左右，在银的催化作用下，四氯吡啶收率得到了很大提高。

The alloy was prepared through melting gold, silver, palladium, tin, indium, ruthenium, zinc, germanium in the high frequency induction furnace protected by argon and then deaerating the crude alloy at vacuum.

合金的合成以金、钯、银、锡、铟、锌、钌和锗元素为原料，在氩气保护下高频感应炉熔化，经真空脱气处理后水淬冷却。

The watermelon sample was extracted with ultrasound,protein was precipitated with potassium ferrocyanide and zinc acetate,and the pigment was decolored with activated carbon,nitrate would produce yellow compound with phenonldisulponic acid on condition of base.

在超声器中提取西瓜样品，用亚铁氢化钾和乙酸锌沉淀蛋白，活性碳脱色素，酚二磺酸碱性条件下和硝酸盐生成黄色化合物，样品的硝酸盐检测结果有较好的准确度和精密度，能满足样品分析需要。

The ethylene-vinyl acetate copolymer formulations containing nanoscale aluminum hydroxide as a flame retardant,organic montmorillonite and zinc borate as synergists were prepared by melt-blending.

采用熔融共混挤出法制备纳米氢氧化铝为主体的阻燃乙烯-醋酸乙烯共聚物材料，研究了阻燃增效剂纳米有机蒙脱土与硼酸锌对复合材料阻燃、力学与电学性能的影响。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。