Using the phosphotungstic acid immobilized on active carbon as catalyst , the iso - amyl gallate was synthesized directly by esterifying isoamyl alcohol and gallic acid 摘要以活性炭固载磷钨酸作为催化剂，用没食子酸与异戊醇直接酯化合成了没食子酸异戊酯。
Cyclohexene can be directly oxidized to adipic acid with 30 % h2o2 in the presence of h7 [ p ( w2o7 ) 6 ] ? xh2o without any phase transfer catalyst and organic solvents 摘要报道了在无相转移剂条件下，用磷钨酸催化过氧化氢氧化环己烯合成己二酸，收率最高为72 . 6 % 。
With phosphato - tungstic acid as catalyst and phosphoric acid as dehydrant , n - phenylmaleimide was prepared from aniline and maleic anhydride by two - step method . the yield was 88 . 7 % and the purity was 98 . 2 % 以顺酐和苯胺为原料,磷钨酸作催化剂,磷酸作脱水剂,采用两步法制得n -苯基马来酰亚胺,得到最佳反应工艺条件,产品收率为88 . 7 % ,纯度为98 . 2 % (质量分数) 。
The morphology of the catalysts was characterized with a transmission electron microscope ( tem ) . modified the three electrodes with two different heteropolyacid respectively and test the well modified electrodes using the cyclic voltammetry and amperometric i - t curve 分别采用磷钼酸和磷钨酸对三种催化剂得到的催化电极进行了修饰,并用循环伏安曲线和不同电位下的恒电位i - t曲线测试了它们的性能。
Because the tungsten from the phosphotungstic acid could pull out and deposit on the surface of catalyst , and the electronegativity of mo - o is smaller than that of w - o . the smaller the electronegativity is , the higher oxidation activity is . thus phosphomolybdic acid shows better catalytic oxidation activity than phosphotungstic acid 由于磷钨酸中的钨可以脱出并少量沉积到催化剂表面,而且从电负性来说mo - o的键能小于w - o ,键能小的杂多酸有较强的氧化性,所以钼系杂多酸催化活性要好于钨系杂多酸。
In order to improve the electro - catalytic activity of platinum based catalyst to methanol oxidation , in this thesis , firstly prepare heteropoly acid modified pt / gc electrode with different concentration by cyclic voltammetry method , and then test the cyclic voltammetry curves individually in vitriolic and methanol solution . the study shows the best concentration for both phosphomolybdic acid and phosphotungstic acid is 1 10 ~ ( - 3 ) mol / l . and find the more heteropoly acid modified on electrode , the lower peak - up potential towards methanol because of the existence of oxygenous species 为了改善铂基催化剂氧化甲醇的催化活性,本论文首先通过循环伏安扫描法制备了不同浓度磷钼酸和磷钨酸修饰的pt / gc电极,通过研究pt / gc电极在修饰前后在硫酸溶液中及含甲醇的硫酸溶液中的循环伏安行为发现,磷钼酸和磷钨酸均能在ptru / c电极上发生氧化还原反应,而且杂多酸修饰浓度对pt / gc电极氧化甲醇的催化活性有很大影响。
The results of biological tests have demonstrated that allantoic fluid of the first passage virus did n ' t produce macroscopic pathogenic role to chicken embryos and after passaged for four times , gross lesions were observed in chicken embryo . the virus showed typical coronavirus under electron - microscope and it could n ' t form plaque in cef cells and could hemagglutinates chicken red blood cells after treatment with 1 % trypsin . to surprise , the virus replicated in cef cells also showed hemagglutination activity to chicken red blood cells . in addition , the spf chickens which inoculated with the virus isolated from the chicken damaged tissue showed clinical sign and grow lesion , but it ' s gross lesion did n ' t resemble to those of field outbreaks 生物学特性：鸡胚尿囊液经离心、磷钨酸负染后，电镜观察该病毒为典型的冠状病毒；该毒株的第一代尿囊液对鸡胚无肉眼可见的致病作用，当继代到第5代后，胚体严重病变；病毒在鸡胚中随着接种时间的延长，其效价增高， 96h可达到48h的2倍；该毒株可在cef上生长，但不能形成明显的蚀斑；经1胰酶处理后可凝集鸡红细胞；鸡胚的第四代尿囊液病毒回归动物体，病死鸡肾脏呈典型的花斑肾，腺胃则未见肉眼可见的病变。
