查询词典 sieves

Highly ordered SBA-15 sieves have been successfully synthesized in a low concentration liquid inorganic acid medium via the addition of small amounts of phosphomolybdic acid.

通过在低浓度无机液体酸介质中添加少量磷钼酸，成功地合成了高度有序的SBA-15介孔分子筛。N2吸附-脱附、XRD、TEM和水热稳定性实验等检测结果表明：用这种方法不仅可以大幅度降低合成SBA-15分子筛所需液体酸的用量和缩短晶化时间，同时反应产物SBA-15在100℃的水中处理72h后仍然保持六方有序的介孔结构

The catalyst was characterized by XRD,no apparent characteristic peaks of phosphotungstic acid are observed,which indicates that heteropoly acid dispersed finely in the molecular sieves,and the structure of ZSM-5 was not destroyed.

将催化剂用于合成乙酸乙酯，探讨了操作条件包括原料组成，催化剂用量和反应时间对酸转化率的影响并与浸渍方法得到的催化剂进行重复使用性能比较。

Meanwhile, the organic components of carbon-pool are found to be different on HZSM-5 and SAPO molecular sieves.

直接观测到了B酸位在反应中的动态变化过程，B酸位参与了中间物种的生成。

AlPO 11, SAPO 11 and CoAlPO 11, CoAPSO 11 molecular sieves were synthesized.

合成了AlPO 11，SAPO 11及其含杂原子Co或Mn的磷铝系列分子筛。

The lattice of SAPO molecular sieves is not rigid after template removal and are very sensitive to adsorbates even at room temperature.

小晶粒的SAPO-34分子筛和金属修饰的SAPO-34分子筛的稳定性降低，MTH反应加剧了分子筛脱硅。

The synthesis of the large single crystals of AlPO〓or SAPO molecular sieves by using phosphorous acid as the source of phosphorus was studied.

4进行了亚磷酸为磷源合成磷酸铝分子筛单晶的实验研究。合成了一系列磷酸铝或硅磷酸铝分子筛单晶。

The catalytic performance of the synthesized molecular sieves, modified by Pd or Pt, for isomerization and dehydroisomerization of n butane was investigated. Pd/SAPO 11 catalyst showed the highest selectivity in...

结果表明，载 0 3%Pd的SAPO 11分子筛催化剂具有最高的丁烷异构化选择性，而在丁烷一步异构脱氢反应中，含金属杂原子的催化剂具有更高的异丁烯选择性。

The calcination and presence of adsorbed phases could lead to rearrangement of Si species in framework, and reaction of MTH aggravates desilication of the SAPO molecular sieves framework.

通过2D〓Al 3Q MAS NMR区分了多种不同配位状态的Al物种，动态跟踪了Al物种在吸附/反应过程中的变化情况。

In this thesis, the reaction of methanol conversion into hydrocarbons on HZSM-5 and SAPO molecular sieves, which is of great importance to industry, is selected as probe reaction to get deeper insights into the structure of solid catalysts and the interaction of reactants with catalysts during adsorption and catalytic reaction by solid state NMR.

本论文主要以固体NMR为研究手段，以甲醇制烃类作为探针反应，详细研究了催化剂的结构、吸附过程中反应物与催化剂的相互作用、反应过程中反应物与催化剂的相互作用，主要取得了如下结果： 1 原位MAS NMR实验结果表明，甲醇制烃类的过程是通过&碳池&机理来实现，&碳池&的组成随反应的进行而变化，在反应前期，&碳池&由饱和烃类构成，随着反应的进行，饱和烃类和不饱和烃类共同组成&碳池&。

When phosphorous acid was used to synthesize SAPO molecular sieves, it was found that the relationship among the reaction mixture composition, crystallization condition and products was different from that in AlPO〓-moleeular sieve synthesis.

研究发现，亚磷酸作磷源合成磷酸铝分子筛的时候，可以拓展一些磷酸铝、硅磷酸铝分子筛合成所使用的模板剂的范围。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐