杂多的

In summary, the alkylation performances of isobutane with butene over bothheteropoly acid and zeolite catalysts have been investigated in this thesis, and theresults are helpful for further development of the solid acid catalysts for this process.

通过本论文的研究，对杂多酸和分子筛催化剂的烷基化性能有了进一步认识，能对今后开发固体酸的碳四烷基化催化剂有所帮助和借鉴。

The optimum conditions were determined as follows:the molar ratio of butyraldehyde to glycol was 1∶1.6,the mass ratio of catalyst to reactants was 0.4%,the volume of cyclohexane as the water-carrying agent was 10 mL,and the reaction time was 60 min.

结果表明，磷钨钼杂多酸对合成丁醛乙二醇缩醛有较好的催化活性，适宜的反应条件如下：n∶n=1∶1.6、催化剂用量为反应物料总质量的0.4%、带水剂环己烷用量为10 mL、反应时间为60 min。

Through addition of heteropolyacid inhibitors, double boiler crystallization to greatly reduce the layer distribution between the filtering layers (mass fraction is controlled in the range of 1%~2%), pressure rises calmly with the increase of filtering time.

通过在结晶釜中加入杂多酸类阻聚剂、采用双釜变温结晶的方法，使过滤层的层间分布显著减小（质量分数控制在1%~2%范围），压力随过滤时间的增加而缓慢平稳升高。

The results show that the influences of the central atoms on electron cloud, electrostatic potential, total density of states are not clear. But the central atom can affect the components of the frontier orbitals HOMO and LUMO.

结果表明，中心原子对Keggin结构杂多阴离子的电子云、静电势、总态密度的分布影响不明显；但中心原子不同，前线轨道HOMO， LUMO的组成有一定差异。

There were hundreds of catalysts from the first single inorganic acid to current heterogeneous catalysts such as metallic oxide, heteroatom molecular sieve and heteropoly acid catalyst.

目前已见报道的催化剂已不下百种，其发展过程从最初单一的无机酸和无机盐类催化剂，发展到非均相的金属氧化物、杂原子分子筛、杂多酸盐催化剂等。

STUDY ON THE SYNTHESIS OF NORMAL BUTYL ACETATE OVER SILICOTUNGSTIC ACID SUPPORTED CATALYST Ⅱ.

文献名称负载杂多酸催化剂的表征及催化合成乙酸正丁酯的研究Ⅱ。

Some typical newly catalysts, such as sulfoacid, inorganics, solid superacids, etc on the reaction of p-hydroxybenzoic esters was summed up especially introduce heteropoly acid catalyst.

总结了磺酸、无机物、固体超强酸等几种典型的合成对羟基苯甲酸酯反应的新型催化剂，重点介绍了杂多酸催化合成对羟基苯甲酸酯。

Toluene nitration was carried out with supported heteropolyacids as catalysts and N2O5 as nitrating agent.

用负载型杂多酸为催化剂，N2O5为硝化剂的新型硝化体系，对甲苯的硝化反应进行研究。

The present invention prepares aldehyde or ketone by catalytic oxidation of alcohol under microwave irradiation, which takes sodium tungstate and tungstic heteropolyacid salts as catalyst, takes bidentate ligand containing nitrogen and oxygen as additive and takes hydrogen peroxide as preparing oxidant.

本发明以钨酸钠和钨的杂多酸盐为催化剂，以含氧氮的双齿配体作为助剂，以双氧水为氧化剂，在微波辐照下催化氧化醇制备得醛或酮。

Phospho-tungstic heteropoly(H3PW12O40) was prepared and its catalytic performance for synthesizing of ethyl hexanoate from hexanoic acid and ethyl alcohol were studied.

结果表明：磷钨杂多酸是合成己酸乙酯的良好催化剂，当酸醇物质的量比为1∶2.0，催化剂用量为0.5 g/0.1 mol己酸，甲苯为8 mL，反应时间为150 min时，酯化率可达97.2

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷