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Properties of dielectrics and microwave heating of zeolites with different framework structures -measurements and theoretical study

不同骨架结构沸石的介电性能和微波加热-测量和理论研究

基本信息

批准号：
14550666
负责人：
OHGUSHI Tatsuo
金额：
$ 1.73万
依托单位：
Toyohashi University 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：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550666/
关键词：
zeolite microwaves absorption heating cation dielectric 吸収効率サイト

项目摘要

It has been suggested so far that cations on the site III in zeolite A show unusual dielectric properties and strongly affect properties of microwave heating. In order to confirm this suggestion, dielectric properties of zeolites (Na_<12>-A and K_<12>-A) with cation on the site III and zeolites (Na_<10>Ca_1-A, Na_8Ca_2-A, Na_4a_4-A and K_<10>Ca_1-A) without that were studied. The former showed lower activation energies of cation motion and the latter higher energies. Absorption efficiencies of zeolites for microwaves were calculated by using the dielectric properties. The former had a higher efficiency than the latter. The former was easily heated by, microwave radiation and reached higher temperature than the latter. Since the calculated properties for microwave heating were in good agreement with he properties measured, the calculation method used was judged valid.The same method was applied to zeolites with different framework structures (zeolite A, L and mordenite). (In the followi … More ngs, zeolite A, L and mordenite are written as -A, -L and -M, respectively.) Absorption efficiencies for microwaves were calculated and were in the order of Na_<12>-A>Na_6K_6-A>Na_<4.3>-M>Na_<10>Ca_1-A>K_9-L>Na_4Ca_4-A On the other hand, final heating temperatures measured were in the order of Na_<12>-A>Na_<4.3>-M>Na_6K_6-A>K_9-L>Na_<10>Ca_1-A>Na_8Ca_2-A>Na_4Ca_4-A. There were two disagreement points in the orders, which are, underlined. The disagreements appeared in the points which are between zeolites with different framework structures. There is a large difference in structural density among these zeolites studied. A correction for the density was made to the absorption efficiencies. The absorption efficiencies were improved after correction but the discrepancies between the calculation and measurements remained still.It is found from the results that the present theoretical method can validly expect the microwave heating properties in the comparison with the identical kind of zeolite but may bring about some discrepancy in the comparison with the different kinds. Less

到目前为止，已经提出，在沸石A中的网站III上的阳离子显示不寻常的介电性能，并强烈影响微波加热性能。为了证实这一观点，我们研究了在III位上有阳离子的沸石（Na_<12>-A和K_<12>-A）和没有阳离子的沸石（Na_<10>Ca_1-A、Na_8Ca_2-A、Na_4a_4-A和K_<10>Ca_1-A）的介电性质。前者表现出较低的阳离子运动活化能，后者表现出较高的能量。利用介电性质计算了沸石分子筛对微波的吸收效率。前者的效率高于后者。前者易于被微波辐射加热，达到比后者更高的温度。由于微波加热性能的计算值与实测值吻合较好，因此认为所采用的计算方法是有效的，并将同样的方法应用于不同骨架结构的沸石（A型、L型和丝光沸石）。(In以下是 ...更多信息沸石A、L和丝光沸石分别写作-A、-L和-M。计算了微波吸收效率，其大小顺序为Na_<12>-A> Na_6K_6-A>Na_<4.3>-M>Na_<10>Ca_1-A>K_9-L>Na_4Ca_4-A。测定了最终加热温度，其大小顺序为Na_<12>-A>Na_<4.3>-M>Na_6K_6-A>K_9-L>Na_<10>Ca_1-A>Na_8Ca_2-A>Na_4Ca_4-A。命令中有两个分歧点，下面用下划线标出。不同骨架结构的沸石分子筛在性能上的差异主要表现在两个方面。这些沸石分子筛的结构密度有很大的差异。对吸收效率进行了密度校正。修正后的吸收效率有所提高，但计算值与实测值的差异仍然存在，结果表明，本理论方法在同种类沸石的比较中能有效地预测微波加热性能，但在不同种类沸石的比较中可能会产生一定的差异。少