本文選題：錳氧化物　切入點：CO催化　出處：《吉林大學》2017年碩士論文　論文類型：學位論文

【摘要】：在21世紀,環(huán)境治理和能源短缺逐漸成為人類共同面對的兩大問題。煤、石油等化石燃料的不完全燃燒和工業(yè)廢氣的排放,容易造成大氣的一氧化碳污染。并且由于化石燃料屬于不可再生資源,如不開發(fā)其他資源而過分使用極易導致能源的枯竭。因此治理一氧化碳污染和開發(fā)可再生太陽能資源成為現(xiàn)今環(huán)境友好科學發(fā)展的重要方向。發(fā)展高效的一氧化碳氧化催化劑和可見光催化劑是目前科學研究的兩個前沿方向。本文采用水熱合成的方法,分別制備了錳氧化物和二氧化鈦,并對其進行改性以增強催化效果。(1)水熱法制備鈣鈦礦型的錳氧化物La_(0.5)Sr_(0.5)MnO_3,使用硝酸簡單可控濕法刻蝕方法,選擇性脫去La~(3+)和Sr~(2+)離子,得到高穩(wěn)定性、保持鈣鈦礦形貌的新型類MnO_2錳氧化物(MO)。使用XRD、XPS、SEM、EDS、BET、H2-TPR等方法對其進行晶體結構、復合材料形貌、表面元素組成的進行了表征分析。新型錳氧化物MO具有較大的比表面積和優(yōu)異的低溫還原性能。通過CO氧化催化測試和活化能計算確定MO的催化氧化活性。結果表明這種酸處理方法,可以使錳氧化物的一氧化碳催化氧化性能得到顯著的提高。(2)TiO_2具有抗光、抗化學腐蝕、價格低廉、制備簡單的優(yōu)點,而被廣泛的應用在光催化領域。本文使用水熱法在FTO導電玻璃上生長出TiO_2納米線陣列,通過電噴霧電離(ESI)技術負載貴金屬鈀(Pd)納米粒子對TiO_2納米線陣列進行優(yōu)化改性,得到復合材料:Pd/TiO_2納米線陣列。通過X-射線光電子能譜(XPS)能夠確定沉積的金屬鈀的價態(tài)為零,即Pd(0);在掃描電子顯微鏡(SEM)和透射電子顯微鏡(TEM)的觀察下可知尺寸約為8 nm的Pd納米粒子均勻地分散在TiO_2納米線陣列上。通過光電流密度測試證實貴金屬Pd負載的方法能夠有效促進TiO_2納米線陣列的光電流響應。
[Abstract]:In twenty-first Century, environmental protection and energy shortage has gradually become the two major problems facing mankind. Coal, oil and other fossil fuel incomplete combustion and industrial emissions of carbon monoxide, easy to cause air pollution. And because fossil fuels are non renewable resources, such as the exploitation of other resources and excessive use can easily lead to the depletion of energy carbon monoxide pollution. Therefore, governance and the development of renewable energy resources has become an important direction of the current environment of scientific development. The development of efficient carbon monoxide oxidation catalyst and visible light catalyst is the two science research at present. This paper uses the method of hydrothermal synthesis, respectively prepared manganese oxide and titanium dioxide, and its modification in order to enhance the catalytic effect. (1) manganese oxide La_ hydrothermal synthesis of perovskite type (0.5) Sr_ (0.5) MnO_3, using simple and controllable wet nitrate The etching method, selectively removing La~ (3+) and Sr~ (2+) ion, high stability, maintain the morphology of the new type of MnO_2 perovskite manganese oxide (MO). The use of XRD, XPS, SEM, EDS, BET, H2-TPR and other methods of crystal structure of the composite surface morphology, elemental composition was characterized. Analysis of new type manganese oxide MO with specific surface area and excellent low temperature reduction performance and more. Through the CO catalytic oxidation test and activation energy calculation to determine the catalytic activity of MO. The results show that the acid treatment method, can make the carbon monoxide catalytic performance of manganese oxide has been significantly improved. (2) TiO_2 with anti light. Corrosion resistant, low price, has the advantages of simple preparation, and is widely used in the field of photocatalysis. The hydrothermal growth of TiO_2 nanowire arrays on FTO conductive glass, by electrospray ionization (ESI) technology supported noble metal Palladium (Pd) nanoparticles were modified to optimize TiO_2 nanowire arrays, the composite material: Pd/TiO_2 nanowire arrays. By X- ray photoelectron spectroscopy (XPS) to determine the valence state of the deposited metal palladium is zero, namely Pd (0); in the scanning electron microscope (SEM) and transmission electron microscopy (TEM the size of the observation) was about 8 nm Pd nanoparticles were uniformly dispersed in TiO_2 nanowires array. The photocurrent density test confirmed that noble metal supported Pd can effectively promote the photocurrent response of TiO_2 nanowire arrays.

【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36

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本文編號：1632578