催化剂

The catalyst conditions of 1,3-propanediol were researched, such as main catalyst, accelerant , solvent, etal.

针对一步法和二步法的技术路线，考察了不同催化条件对反应结果的影响，如主催化剂、膦配体、促进剂、活化剂和溶剂等。

The extent of dehydration was examined by means of "accelerative ageing".

试验结果表明，制备方法和条件对催化剂的孔结构和表面酸性质均有影响。

I want to say, it only served as a catalyst, or accelerator effect.

我想说，它只起到了催化剂，或者加速器的作用。

Acenaphthenone was prepared by the oxidation of acenaphthene in the presence of chromic anhydride , acetic acid and polyethylene glycol as a phase transfer catalyst under mild reaction conditions with high yields.

研究了在铬酸酐、冰醋酸和相转移催化剂聚乙二醇存在下苊的氧化反应，较温和的条件可高产率地得到苊酮。

The results showed that the catalyst, with calcium phosphate as the main part, is active and selective in the splitting of acetal.

实验结果表明：以磷酸钙为主体的催化剂对缩醛裂解反应具有较高的活性和选择性。

In this paper,2,2-dimethylolbutyraldehyde was synthesized through the acetal reaction of formaldehyde and butyraldehyde,using phosphomolybstic acid as catalyst.

研究了磷钼酸对此缩醛反应的催化反应活性，以及催化剂的用量、反应物配比、反应时间等因素对反应产物收率的影响，确定了最佳催化条件。

In this paper, 2,2-dimethylolbutyraldehyde was synthesized through the acetal reaction of formaldehyde and butyraldehyde, using silicotungstic acid as catalyst.

通过实验研究了硅钨酸对此羟醛缩合反应的催化效果，研究探讨了硅钨酸对此缩醛反应的催化反应活性，以及催化剂的的用量，反应物配比，反应时间等因素对反应产品收率的影响，确定了最佳催化条件。

The effects of mole ratio of reactants,reaction time and catalyst dosage on the yield of n-octylaldehyde 1,2-propylene glycol acetal were examined.

考察了醛醇摩尔比、反应时间、催化剂用量及其重复使用等因素对反应的影响，优化了反应条件。

The experimental results showed that SO_4 2-/TiO_2-MoO_3 was an excellent catalyst for synthesizing isobutyraldehyde glycol acetal .

研究了以固体超强酸SO42-/TiO2-MoO3为催化剂，异丁醛和乙二醇为原料，合成异丁醛乙二醇缩醛的反应条件。

Selectivity of acetal was obtained over the Cu/HY-25 catalyst at the temperature of 413K.

通过铜盐与酸功能组分的匹配，以醋酸铜和HY-25分子筛制备的催化剂，在413K生成乙缩醛的选择性大于80％。

Life. But the intrinsic way of the Internet by wire confines accessing and using of the network information.

然而，Internet固有的有线连接方式大大限制了人们对网络信息的访问和使用。

I have a strong persuasion that this is true .

我坚信这是正确的。