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，并研究了它们的结构变化。1。半径也减少了，在晶体YPO_4的情况下，其1-丁烯异构化的催化活性也减少了，其比表面积和孔体积降低了，Althooth平均孔径增加了。 TIP_2O_7是地面的，它们的表面是改变的，并且随着特定表面积的增加，1-丁烯异构化的活性是由于其大体所涉及的无定形材料而导致的。钙化后的材料。 Bronsted Acid位置，另一个。在制造过程中，ti（ti hpo_4）在_2中被视为湿度。（HPO_4）_2 _ NH_2O被压接的NH_2O与从非地面Ti（HPO_4）制备的_2 _2 ・NH_2OHOWEVER进行了比较，在CU-P-y复合氧化物传感器之间没有显着差异。