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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，并研究了它们的结构、催化活性和湿敏性的变化。几种无机磷化合物的合成及其催化活性和理化性质的变化在有机溶剂和水的混合物中合成的结晶AIPO_4研磨后，其顺-2-丁烯异构化的催化活性降低，其比表面积、孔体积和平均孔半径也减小。对于YPO_4晶体，其对1-丁烯异构化的催化活性降低，比表面积和孔体积减小，但平均孔半径增大。对Ti (HPO_4) _2·nH_2O和TiP_2O_7晶体进行研磨后，改变了其表面酸度，提高了1-丁烯异构化活性和比表面积。这些磷酸盐的活性增加被认为是由于大部分磷酸盐暴露在非晶物质中，而非晶物质在煅烧后转变为活性物质。研磨可以提高BPO_4对顺-2-丁烯或丙烯的聚合活性。比表面积增大，孔隙体积和平均孔隙半径减小。该活性主要归因于Bronsted酸位点的存在，但也应考虑孔隙体积和平均孔隙半径等其他因素。Ti (HPO_4)_2·nH_2O和Cu-P-Y复合氧化物研磨对其感湿特性的影响Ti (HPO_4)_2·nH_2O的固体酸度与其在潮湿气氛中的电导率密切相关。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经过研磨和加热。通过这样的处理，它的酸性会被改变，从而也会改变其感湿特性。因此，将Ti (HPO_4) _2·nH_2O研磨后再加压加热制备的湿度传感器与未研磨的Ti (HPO_4) _2·nH_2O制备的湿度传感器进行了比较。然而，与预期相反，他们之间没有显著差异。Cu-P-Y复合氧化物传感器也得到了类似的结果。少