查询词典 reducing agent

The invention uses benzene carbonic acid as raw material, uses hydrogen gas as reducing agent, and uses ZrO2, TiO2 and Y2O3 as main accelerating agent. In solid-bed reactor the invention carries out hydrogenation reduction reaction. The reaction temperature is 340-450Deg.C, gas hourly space velocity is 600-4800h-1, hydracid mole rate is 20:1-160:1, the selectivity ratio of benzaldehyde is 96%, and the productivity is above 90%.

该方法以苯甲酸为反应原料，以氢气为还原剂，以复合氧化物ZrO 2 、TiO 2 和Y 2 O 3 为主催化剂，在固定床反应器中，进行气相加氢还原反应，反应温度为340℃～450℃，气时空速为600h -1 ～4800h -1 ，氢酸摩尔比为20∶1～160∶1，采用本发明制备苯甲醛的选择性可达96％以上，收率可达90％。

The effect of additives combined polyalcohol anion surface active agent with alkali activator or high efficiency sulfonate water-reducing agent on physic-chemical performance of slag powder and slag-cement system pastes have been studied.

选择多元醇类阴离子表面活性剂分别与碱性激发剂和高效磺酸盐减水剂进行复合，研究了复合添加剂对矿渣粉体和矿渣-水泥浆体的物理化学性质的影响。

Potassium silver cyanide and potassium gold cyanide, which stability constants are very large, were used as the starting materials for the preparation of silver and gold powders. Adjusting the concentration ratio of protective agent to reducing agent and other reaction conditions can control the size, shape and morphology of precious metals nanoparticles.

使用氰化亚金钾和氰化银钾等稳定常数很大的金和银配合物作为制备纳米金粉和银粉的前驱体，控制保护剂／还原剂的比例以及其它反应条件，可以有效地控制粒子的大小、形状以及粒子聚集体的形貌。

Each oxidizing agent has a reduced form called its conjugate reducing agent.

每个氧化剂有一个还原了的形式，叫它的共轭还原剂。

However, the quality of the copper film deposited by this method is poor. In order to resolve this problem, we study the influence of some additives on two different kinds of electroless copper plating which using sodium hypophosphite as reducing agent and sodium citrate as chelating agent, sodium citrate and ethylene diamine tetraacetic acid disodium salt (EDTA·2Na). Electrochemical methods were used to test the anodic and cathodal polarization processes which can explain the mechanism of the influence of additives.

然而该体系所得的铜膜质量较差，为此我们研究了以次磷酸钠为还原剂，分别以柠檬酸钠为单一络合剂，柠檬酸钠和乙二胺四乙酸二钠为双络合剂体系中，研究了几种添加剂对化学镀铜的影响，并通过电化学方法研究了各种添加剂对化学镀铜沉积电位的影响。

The electroless copper plating was studied in a bath consisting of glyoxylic acid as reducing agent,Na2EDTA as complexing agent,both 2,2′-dipyridyl and K4Fe6 as additives,focused on the influence of the additives on the deposition rate,as well as on the composition,structures and surface morphology of the deposits.

以乙醛酸作还原剂、Na2EDTA为络合剂、2，2′-联吡啶和亚铁氰化钾作为添加剂组成化学镀铜体系，研究了两种添加剂对化学镀铜速率、镀层表面形貌、组成和结构的影响。

The experimental results show that when the low temperature adhesive polyvinyl alcohol is 0.5%, the high temperature adhesive silicasol is 0.5%, water reducing agent calcium lignosulphonate is 0.5%, rheologic agent Suzhou clay is 1.5%, the best dispersive slurry can be obtained by adding 0.9 weight percent of TMAH.

结果表明，在粘结剂聚乙烯醇加入量为0.5%，减水剂木质素磺酸钙加入量为0.5%，流变剂苏州土加入量为1.5%时，调整分散剂的加入量，当浆料中分散剂四甲基氢氧化铵的质量分数为0.9%时，可获得具有较佳分散性能的浆料。

Micrometer-sized MoO2 hollow spheres were synthesized hydrothermally with ammonium heptamolybdate tetrahydrate as molybdenum source, Cetyltrimethylammonium bromide as structure-directing agent and C2H5OH as reducing agent, respectively.

在阳离子表面活性剂的作用下，以钼酸铵为钼源，乙醇作为还原剂合成了微米级MoO2空心球。

In this article, the factors that affect molecular weight and solubility of polyacrylamide are studied and suitable initiator system is selected. The optimum parameters of copolymerizing process are obtained as follows: the molar proportion of acrylamide and sodium acrylate is 7:3, the monomer concentration is 30%, pH value of solution is 12, the oxidizer (K2S2O8) concentration is 0.1%, the reducing agent (NH2CONH2) concentration is 1%, the chain-transfer agent concentration is 0.4%. The initial reaction temperature is 35℃.

讨论了影响聚丙烯酰胺分子量和溶解性能的因素，选取了合适的氧化-还原引发体系，确定了制备超高分子量速溶型部分水解聚丙烯酰胺的优化聚合工艺参数：起始共聚合反应温度为35℃，保持在密闭条件下的共聚合反应2.5h后，再将聚合反应温度升高到55℃，继续反应2h，反应结束；反应溶液单体总浓度：30％，共聚合反应溶液pH值：12，氧化剂K_2S_2O_8：0.1％，还原剂NH_2CONH_2：1％，共聚合反应中两种单体的投料比：丙烯酰胺：丙烯酸钠=7：3，异丙醇链转移剂：0.4％。

Its main elements are effective water reducing agent,retarder and air entraining agent.

配制HPC掺用外加剂是最重要的途径，其主要成份是高效减水剂、缓凝剂、引气剂，合理掺用可以取得最佳技术效果，过量掺用或使用不当则会产生负面影响。

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。