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通过固相热反应,以十种不同的配比和不同的焙烧制度,在MoO3中分别掺杂Fe2O3、V2O5、TiO2(锐钛矿型)、WO3和ZrO2,制得五种二元氧化物的系列试样.应用XRD、BET、FT-IR、DSC、半导体气敏特性和催化反应探针等表征技术,较系统地研究了这些组分氧化物形成二元氧化物时界面的非晶相分散结构及催化性能,并提出了相应的亚单层的非晶相分散模型.本文首先报道应用XRD,FT-IR和BET表征界面的非晶相分散.研究结果发现,各个组分氧化物的表面大小不同,但每一对组分氧化物在相互掺杂时,在界面上发生了组分氧化物的亚单分子层(meta-monolayer)的非晶相分散以及某些表面化学反应,前者的非晶相含量具有本征性的分散阈值,后者则生成新的化学物种.根据BET比表面积,求算了各组分氧化物在不同二元氧化物中每100m2的不同的非晶相分散阈值.XRD晶相定量分析和FT-IR差谱法(the differential spectra method)联合证明了非晶相新物种的存在,首次发现非晶相新物种的IR特征吸收峰与分子键价结构的关联.
Five kinds of binary oxides were prepared by solid-state thermal reaction with Fe2O3, V2O5, TiO2 (anatase type), WO3 and ZrO2 respectively in ten different proportions and different calcination systems Series of samples were prepared.The surface morphologies of these oxides were investigated systematically by XRD, BET, FT-IR, DSC, gas sensing properties of semiconductors and catalytic reaction probes. Structure and catalytic properties of the amorphous phase and the corresponding sub-monolayer amorphous phase dispersion model was proposed.In this paper, the amorphous phase dispersion of the interface was first reported by XRD, FT-IR and BET.The results show that the surface of each component oxide But the size of each of the two component oxides is interdoping with one another, the meta-monolayer of the component oxides undergoes amorphous phase dispersion and some surface chemical reactions at the interface. The former The amorphous phase content has an intrinsic dispersion threshold, and the latter generates a new chemical species.On the basis of the BET specific surface area, the dispersion of the oxide of each component in 100 m 2 of different amorphous phases in different binary oxides is calculated Threshold.XRD quantitative analysis and FT-IR differential spectroscopy (the differential spectra method to prove the existence of new amorphous phase species. For the first time, it was found that the IR absorption peaks of new amorphous phase species correlate with the molecular bond structure.