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The experiment indicates: on condition that the mole ratio is 1.1:1, temperature is 90~98℃, pH is 1~2, acid adding speed is 1 drop/(2~3) second, the yield and quality of the products can get increased when reaction liquid disposed with ultrasound wave.

实验表明:在硅酸钠与钨酸钠的物质的量比为1.1:1,控温90~98℃,pH值1~2,加酸速率1滴/(2~3)s的优化条件下,用超声波处理反应液可以增加产品的产量和质量。

Optical materials ; PbWO_4 crystal ; optical properties ; electronic structure ; raspite structure

光学材料;钨酸铅晶体;光学性质;电子结构;斜钨矿结构

A series of SiW_(12)/AC catalysts with different silicotungstic acid loadings supported on acti- vated carbon which was treated with 10% HNO_3 solution were prepared by an impregnation method and the catalytic performance of SiW_(12)/AC for the synthesis of trioxane were investigated.

以10%硝酸溶液处理过的活性炭为载体,采用不同质量分数的硅钨酸SiW_(12溶液为浸渍液,制备了不同负载量的SiW_(12)/AC催化剂,考察了催化剂在合成三聚甲醛中的催化性能,并用XRD、FT-IR、NH_3- TPD、BET、TG-DSC等手段对SiW_(12)/AC催化剂晶粒大小、催化剂表面的酸量及酸强度、比表面积及热稳定性等微观特性进行了表征。

Monodispersed tungstic acid nanoparticles with an average diameter of 20 nm were prepared by a ultra-violet light irradiation of oxotungsten-citrate complex aqueous solution.

通过紫外光照射柠檬酸钨氧配合物水溶液,制备了平均粒径约为20nm的单分散钨酸纳米颗粒。

If the tungstic acid alone was used a...

钨酸-磺酸水杨酸催化体系重复使用五次后,己二酸分离产率仍可达到 80.5%。

As catalyst, the tungstosilicic and phosphato-tungstic acids have similar catalytic activities which are six times more than that of sulfuric acid in the same reactive conditions.

钨硅酸和磷钨酸具有相似的活性活性,在同样条件下,其速度常数均为硫酸的六倍,其选择性为硫酸的3倍。

In this paper tungstosilicic triethanolamine salt and tungstophoric triethanolamine salt were prepared and used as catalysts in the synthesis of n-butyl lactate ,The synthetic conditions with tungstosilicic triethanolamine salt as catalyst were also examined.

合成了硅钨三乙醇胺盐和磷钨酸三乙醇胺盐,并以它们为催化剂,合成了乳酸正丁酯。

The present invention is characterized in that the ammonium metatungstate powders and the cobltic-nitrate powders are respectively dissolved in the water and scattered in the liquid nitrogen to be pre-frozen using a nitrogen spray gun after being mixed and defecated, and then are placed in a freezedryer to be dried vacuumly and finally the powders are obtained. The nanometer powder i.e. the nano tungsten-cobalt composite powder is obtained by reducing the freeze-dried mixed powder in the atmosphere of hydrogen.

该微晶硬质合金的制备方法特征为:将偏钨酸铵粉末与硝酸高钴粉末分别溶于水中,混合澄清后使用氮气喷枪,将其分散在液氮中预冻后置于冻干机中进行真空干燥得到粉末;在氢气气氛中对冻干的混合粉末进行还原得到纳米粉体,即钨钴纳米复合粉体。

According to the experimental data, it is indicated that molybdenum acts as the catalyst, which exists in a much mo...

我们曾用此法在不分离钨的条件下,测定了钨酸钠中微量的钼。

Dibutyl maleate was prepared from maleic anhydrideand n- butyl alcohol in the presence of tungstophosphoric acid or molybdophosphoric acid .

用顺丁烯二酸酐和正丁醇为原料,分别以磷钨酸和磷钼酸为催化剂,合成了顺丁烯二酸二丁酯。

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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。

When I was in school, the rabbi explained everythingin the Bible two different ways.

当我上学的时候,老师解释《圣经》用两种不同的方法。