本文選題：鐵酸鎳 + 氧空位�。� 參考：《上海應(yīng)用技術(shù)大學(xué)》2017年碩士論文

【摘要】：人類活動(dòng)導(dǎo)致大氣中CO2濃度越來(lái)越高,溫室效應(yīng)已經(jīng)對(duì)環(huán)境產(chǎn)生了嚴(yán)重的影響。因此尋找一種可以解決CO2氣體污染的方法已經(jīng)成為世界熱點(diǎn)話題。在眾多備選方案中,利用催化劑在光熱條件下催化轉(zhuǎn)化CO2為碳?xì)浠衔锍蔀橐粋�(gè)可行性高、易于實(shí)現(xiàn)的方法。這一方法不僅可以降低大氣中的CO2含量從而解決環(huán)境污染問題,而且其反應(yīng)產(chǎn)物為易儲(chǔ)存的化學(xué)燃料,可以緩解目前世界資源短缺問題。鐵酸鹽材料的價(jià)格低廉,制備工藝簡(jiǎn)單,在CO2催化還原領(lǐng)域中是研究者重點(diǎn)關(guān)注的材料之一。因此,本篇論文圍繞性能最佳的鐵酸鎳展開,利用多種方法對(duì)其進(jìn)行改性,力求得到具有極致催化性能的新型催化材料。詳細(xì)科研工作及成果如下三個(gè)部分:1.高氧空位濃度鐵酸鎳催化劑的制備及其光熱催化性能研究利用溶劑熱方法,乙二醇作為表面活性劑,通過調(diào)節(jié)前驅(qū)體溶劑中的乙二醇比例來(lái)調(diào)節(jié)鐵酸鎳催化劑的氧空位含量,探究催化劑中氧空位的濃度與光熱催化效率的內(nèi)在關(guān)系,研究具有氧缺陷鐵酸鎳的熱催化反應(yīng)機(jī)理,以及表面活性劑在溶劑熱法合成催化劑時(shí)對(duì)催化劑晶相結(jié)構(gòu)的影響。帶有氧空位的鐵酸鹽具有高的裂解二氧化碳和水的能力,有制備工藝簡(jiǎn)單易操作、原料低價(jià)等優(yōu)點(diǎn)。而且高濃度的氧空位不僅作為缺陷中心,在價(jià)帶附近創(chuàng)造了雜質(zhì)能級(jí),并誘導(dǎo)帶隙變窄。這使得含有氧空位的金屬氧化物催化劑可以進(jìn)行光催化用途的探究。因此,研發(fā)探究新的鐵酸鎳合成工藝、探索發(fā)現(xiàn)更少步驟更加便捷合成鐵酸鎳高密度氧空位的方法為本論文的設(shè)計(jì)方案內(nèi)容。2.具有不同晶面形貌的鐵酸鎳催化劑的制備及其光熱催化性能研究通過不同的合成方法,利用不同的反應(yīng)溶劑以及模板劑有選擇性的制備具有暴露不同晶面的不同形貌的鐵酸鎳催化劑。探究暴露不同晶面的鐵酸鎳對(duì)催化反應(yīng)的影響,因?yàn)橥N元素的化合物由于暴露晶面不同其表面結(jié)構(gòu)會(huì)有天壤之別,而且催化劑的暴露晶面直接和反應(yīng)組分接觸,對(duì)于催化劑而言,高能活性晶面的暴露量越多對(duì)催化劑的催化活性越有利。通過使用導(dǎo)向劑、表面活性劑或調(diào)節(jié)溶劑PH等方法可以有選擇性的合成出有利于催化劑催化活性的高能活性面,并且通過調(diào)節(jié)其含量使催化劑性能提升更多。因此,研發(fā)探究新的鐵酸鎳合成工藝、探索發(fā)現(xiàn)更少步驟更加便捷合成鐵酸鎳高能活性面的方法為本論文的設(shè)計(jì)方案內(nèi)容。3. 3DOM結(jié)構(gòu)鐵酸鎳催化劑的制備及其光熱催化性能研究以不同粒徑的PMMA作為硬模板,用鎳鹽和鐵鹽溶于一定比例的乙二醇和甲醇溶液作為前驅(qū)體,合成不同孔徑尺寸的具有三維有序大孔(3DOM)結(jié)構(gòu)的鐵酸鎳催化劑,探究催化劑的不同孔徑尺寸對(duì)CO2光熱催化反應(yīng)效率的作用,以及孔徑尺寸與催化劑自身比表面積的關(guān)系,同時(shí)引入光子晶體概念,探究光子效應(yīng)對(duì)CO2光熱催化反應(yīng)性能的影響。3DOM結(jié)構(gòu)的多孔金屬氧化物催化劑具有極高的比表面積有助于提高表面催化反應(yīng)效率,因而成為熱點(diǎn)研究領(lǐng)域。而且由于其孔道成周期性排布,因此有可能該催化劑有光子晶體特有的效應(yīng)---光子禁帶(阻止特定波長(zhǎng)的光透過,即光在催化劑中停留時(shí)間增長(zhǎng)),從而通過合成特殊結(jié)構(gòu)達(dá)到了提高吸光度的效果,最終同時(shí)提高材料的光熱催化性能。這使得3DOM金屬氧化物催化劑可以進(jìn)行光催化用途的探究。因此,研發(fā)探究新的3DOM鐵酸鎳合成工藝、探索發(fā)現(xiàn)更少步驟更加便捷合成孔徑高度規(guī)整排列的鐵酸鎳3DOM結(jié)構(gòu)的方法為本論文的設(shè)計(jì)方案內(nèi)容。
[Abstract]:Human activities cause the atmospheric concentration of CO2 is more and more high, the greenhouse effect has caused a serious impact on the environment. So looking for a method to resolve CO2 gas pollution has become a hot topic in the world. Many alternatives, in the condition of CO2 for photothermal catalytic conversion of hydrocarbons into a high feasibility using catalyst, easy to the implementation method. This method can not only reduce the content of CO2 in the atmosphere so as to solve the problem of environmental pollution, and the chemical reaction product is easy to store fuel, can alleviate the current shortage of resources in the world. The ferrite material with low price, simple preparation process, the catalytic reduction of CO2 in the field of research is one of the focuses on the the material. Therefore, this thesis focuses on the optimal performance of nickel ferrite, it was modified by a variety of methods to try to get to the extreme with catalysis New catalytic materials. The detailed research work and achievements of the following three parts: 1. high oxygen vacancy concentration of nickel ferrite catalyst and its catalytic properties of photothermal by solvothermal method, ethylene glycol as the surfactant, the content of oxygen vacancies by adjusting the proportion of ethylene glycol precursor solvents to adjust nickel ferrite catalyst the inner, explore the relationship between concentration and thermal catalytic efficiency of oxygen vacancies in the catalyst, catalytic reaction mechanism of nickel ferrite with oxygen vacancies, and surfactants in the solvothermal synthesis catalyst to catalyst crystal structure. The influence of ability with oxygen vacancy ferrite has high cracking of carbon dioxide and water, there is the preparation process is simple and easy to operate, low price of raw materials and other advantages. But high concentration of oxygen vacancy defects not only as the center, near the valence band created the impurity level, and induce the narrowing of the band gap. This makes To explore the metal oxide catalysts containing oxygen vacancies can be photocatalytic applications. Therefore, research on the new synthetic technology of nickel ferrite, nickel ferrite catalyst exploration discovery method less steps more convenient synthesis of nickel ferrite with high density of oxygen vacancies for the design of.2. with different crystal surface morphology of the system study on Preparation and catalytic performance of photothermal through different synthesis methods, using different reaction solvent and template selective preparation with exposure to Nickel Ferrite Catalysts with different morphologies and different crystal planes. On exposure isomorphous influence surface of nickel ferrite on the catalytic reaction, because of the same element compounds because of different exposure to the surface of crystal surface the structure will have a world of difference, and the catalyst exposed crystal surface directly and reaction components for contact, catalyst, high active crystal surface exposure of more The catalytic activity of the catalyst is more favorable. By using the guide agent, surface active agent or solvent PH method can selectively synthesize a high active surface for catalytic activity, and by adjusting the content of the catalyst performance more. Therefore, research on the new synthetic technology of nickel ferrite, discovery scheme the contents of.3. 3DOM structure of nickel ferrite catalyst less steps more convenient synthesis of nickel ferrite high active surface method for the preparation of catalytic performance and photothermal with different particle size PMMA as hard template, nickel and iron salts dissolved in a certain proportion of ethylene glycol and methanol solution as the precursor, with 3D ordered macroporous synthesis of different pore sizes (3DOM) nickel ferrite catalyst structure, the effect of different pore size of catalyst on CO2 thermal catalytic efficiency, and hole Size and specific surface area of the catalyst itself, at the same time, introducing the concept of photonic crystal, photonic study effect on CO2 thermal catalytic performance on.3DOM structure of porous metal oxide catalyst with high specific surface area is helpful to improve the surface catalytic efficiency, and thus become a hot research field. And because of the periodic arrangement of channels therefore, there may be the catalyst effect, photonic band gap characteristic (to prevent specific wavelengths of light through the light in the catalyst residence time, thus growth) through the synthesis of special structure to improve the absorption effect, thermal catalytic properties of materials and improve the final. This makes 3DOM metal oxide catalysts can be explored photocatalytic applications. Therefore, research on 3DOM nickel ferrite synthesis process of new discovery, fewer steps and more convenient synthetic aperture The highly regular arrangement of nickel ferrite 3DOM structure is the content of the design of this paper.

【學(xué)位授予單位】：上海應(yīng)用技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ138.13;TQ426

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