【摘要】：碳納米材料由于其優(yōu)異的物理和化學(xué)性能已被廣泛地用于許多領(lǐng)域。這種由碳材料,金屬氧化物和金屬納米粒子的復(fù)合材料在能源和環(huán)境領(lǐng)域有許多的應(yīng)用。本文致力于開發(fā)用于制備具有高的催化活性,以及較大的表面積的納米碳復(fù)合材料簡(jiǎn)單的方法,并開發(fā)一種經(jīng)濟(jì)有效的方法來制備由金屬氧化物和碳納米材料復(fù)合的材料。通過無溶劑熱解二茂鐵和聚乙烯吡咯烷酮(PVP)制備鐵系的碳包覆的復(fù)合材料。研究了溫度,時(shí)間,投料比對(duì)產(chǎn)物形貌的影響,優(yōu)化了工藝參數(shù),并通過XRD,SEM等光譜手段對(duì)晶體結(jié)構(gòu)和形貌進(jìn)行了表征。合成的復(fù)合材料在催化劑性能評(píng)價(jià)裝置上進(jìn)行水煤氣變換反應(yīng)催化性能測(cè)試。實(shí)驗(yàn)表明,在溫度為500℃,時(shí)間為4h,二茂鐵：PVP=1：5時(shí)產(chǎn)物形貌為球形,且分散度較好。催化性能測(cè)試表明制備出的碳包覆的復(fù)合材料有一定的催化性能,但活性不高。通過溶劑熱解八羰基二鈷和聚乙烯吡咯烷酮(PVP)制備鈷系的碳包覆的復(fù)合材料。應(yīng)用本試驗(yàn)中應(yīng)用的最佳工藝參數(shù),并通過SEM對(duì)其形貌進(jìn)行了表征,結(jié)果表明產(chǎn)物均勻垂直生長于基板平面上。催化性能測(cè)試表明制備出的碳包覆的復(fù)合材料有一定的催化性能,在不同的溶劑體系中催化活性不同。通過溶劑熱解二茂鐵,八羰基二鈷和聚乙烯吡咯烷酮(PVP)制備鐵,鈷系的碳包覆的復(fù)合材料(碳包覆的金屬鐵酸鹽)。應(yīng)用本試驗(yàn)中應(yīng)用的最佳工藝參數(shù),并通過XRD,SEM等光譜手段對(duì)晶體結(jié)構(gòu)和形貌進(jìn)行了表征,結(jié)果表明PVP過量時(shí),顆粒沒有完全生長出,PVP少量時(shí)呈現(xiàn)海膽狀結(jié)構(gòu)。催化性能測(cè)試表明制備出的碳包覆的復(fù)合材料有一定的催化性能,但活性不高,耐熱性不好。通過搭載煤矸石分子篩,在氮?dú)猸h(huán)境下無溶劑熱解制備鐵,鈷系碳包覆的金屬氧化物復(fù)合材料和鐵鈷共存的碳包覆的復(fù)合材料,并通過XRD,SEM等光譜手段對(duì)晶體結(jié)構(gòu)和形貌進(jìn)行了表征,SEM結(jié)果表明顆粒均勻分散在分子篩的表面。催化性能測(cè)試表明制備出的碳包覆的復(fù)合材料無催化性能。這種制備方法提供了一種簡(jiǎn)單的,一步法制備碳包覆的金屬氧化物復(fù)合材料,并研究其在水煤氣變換反應(yīng)中的催化性能。試驗(yàn)表明碳包覆的復(fù)合材料有一定的催化性能,但活性不高。我們將以上方法推廣應(yīng)用到制備碳共包覆的鐵,鈷系復(fù)合材料,并研究其在水煤氣變化反應(yīng)中的催化能力。實(shí)驗(yàn)表明二茂鐵占主要配比制備出的催化劑的催化性能差,而八羰基二鈷占主要配比制備出的催化劑的催化性能較好。搭載煤矸石為載體的催化劑幾乎沒有活性。
[Abstract]:Carbon nanomaterials have been widely used in many fields due to their excellent physical and chemical properties. This composite composed of carbon materials, metal oxides and metal nanoparticles has many applications in energy and environment. This paper is devoted to the development of a simple method for preparing nano-carbon composites with high catalytic activity and large surface area, and an economical and effective method for the preparation of materials composed of metal oxides and carbon nanomaterials. Carbon coated iron composites were prepared by solvent-free pyrolysis of ferrocene and polyvinylpyrrolidone (PVP). The effects of temperature, time and feed ratio on the morphology of the product were studied. The process parameters were optimized, and the crystal structure and morphology were characterized by XRD,SEM and other spectroscopic methods. The composite materials were tested on the catalyst performance evaluation device for water gas shift reaction. The results showed that the morphology of ferrocene: PVP=1:5 was spherical and the dispersion was better when the temperature was 500 鈩，

本文編號(hào)：2322090