Synthesis of Inorganic Phosphorus Compounds and Their Changes in Structure and Surface Property by Grinding

无机磷化合物的研磨合成及其结构和表面性质的变化

基本信息

批准号：
08650987
负责人：
TADA Akio
金额：
$ 1.28万
依托单位：
Kitami Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650987/
关键词：
inorganic phosphorus compound catalytic activity acidic property specific surface area crystal structure pore radius pore volume grinding 表面酸塩基性質結晶子サイズ湿度センサー

项目摘要

Several inorganic phosphorus compounds were synthesized and their changes in structure, catalytic activity, and humidity-sensitivity by grinding were investigated.1. Synthesis of several inorganic phosphorus compounds and their changes in catalytic activity and physicochemical propertyWhen crystalline AIPO_4 which were synthesized in a mixture of organic solvent and water was ground, its catalytic activity for cis-2-butene isomerization was decreased, and its specific surface area, pore volume, and mean pore radius were decreased too. In the case of crystalline YPO_4 also, its catalytic activity for 1-butene isomerization was decreased, and its specific surface area and pore volume were decreased, although mean pore radius was increased. When crystalline Ti (HPO_4) _2・nH_2O and TiP_2O_7 were ground, their surface acidity was changed, and the activity for 1-butene isomerization as well as the specific surface area were increased. The increase in activity of those phosphates by grinding … More was considered to be due to the exposure of an amorphous material involved in the bulk of them, and the transformation of the amorphous material to active species after calcination. The activity of BPO_4 for the oligomerization of cis-2-butene or propene was increased by grinding. The specific surface area was also increased, while the pore volume and mean pore radius were decreased. The activity was mainly ascribed to the presence of Bronsted acid sites, although the other factors such as pore volume and mean pore radius should be considered.2. Effect of grinding of Ti (HPO_4)_2・nH_2O and Cu-P-Y composite oxides on their humidity-sensing characteristics The solid acidity of Ti (HPO_4) _2・nH_2O is closely related to its electric conductivity when it is placed in a wet atmosphere. The dependence of its electric resistance on humidity allows it to be utilized as a humidity sensor. In the manufacturing process. Ti (HPO_4) _2・nH_2O is subjected to grinding and heating. By such treatments, its acidic property will be changed and as a result the humidity-sensing characteristic will also be changed. Therefore, the humidity sensor prepared from Ti (HPO_4) _2・nH_2O which was ground before being pressed and heated was compared with that prepared from non-ground Ti (HPO_4) _2・nH_2O.However, contrary to expectation, there is no significant difference between them. Similar result was obtained for Cu-P-Y composite oxide sensor. Less

合成了几种无机磷化合物，并通过研磨研究了它们的结构变化，催化活性和湿度敏感性。1。几种无机磷化合物的合成及其在催化活性和物理化学特性中的变化，当时在有机溶液的混合物中合成的结晶AIPO_4，其构成，水是接地的，其CIS-2-二丁烯异构化的催化活性得到了改善，其特定的表面积，孔隙体积和平均孔径和平均孔径也降低了。在晶体YPO_4的情况下，尽管平均孔径增加了平均孔径，但其1-丁烯异构化的催化活性减少了，其比表面积和孔体积减小。当结晶Ti（HPO_4）_2 _2 nh_2O和TIP_2O_7被接地时，它们的表面酸度发生了变化，并且1-丁烯异构化的活性以及比表面积增加。这些磷酸盐通过研磨的活性增加……更多是由于大部分涉及的无定形物质的暴露，以及计算后无定形物质向活性物种的转化。通过研磨增加了BPO_4对CIS-2-丁烯或丙烯的寡聚的活性。比表面积也增加了，而孔体积和平均孔径则减小。该活性主要归因于布朗斯特酸位点的存在，尽管应考虑其他因素，例如孔体积和平均孔半径。2。 Ti（HPO_4）_2・NH_2O和CU-P-Y复合氧化物对湿度感密度特性的磨削的影响ti（HPO_4）_2 _2・NH_2O的固体酸度与将其电力放置在潮湿气氛中时与其电力性密切相关。其电阻对湿度的依赖性使其可以用作湿度传感器。在制造过程中。 ti（HPO_4）_2 ・NH_2O受到研磨和加热。通过这种处理，其酸性特性将改变，因此，湿度感应特性也将改变。因此，将湿度传感器从Ti（HPO_4）制备的_2・NH_2O制备，该nh_2o在被压下和加热之前与非地面Ti（HPO_4）_2 _2・NH_2O进行了比较。但是，与期望形成对比，它们之间没有显着差异。 CU-P-Y复合氧化物传感器获得了相似的结果。较少的