碳基金属氧化物复合材料的制备及其在水煤气变换反应中的应用
发布时间：2018-11-10 09:46
【摘要】：碳纳米材料由于其优异的物理和化学性能已被广泛地用于许多领域。这种由碳材料,金属氧化物和金属纳米粒子的复合材料在能源和环境领域有许多的应用。本文致力于开发用于制备具有高的催化活性,以及较大的表面积的纳米碳复合材料简单的方法,并开发一种经济有效的方法来制备由金属氧化物和碳纳米材料复合的材料。通过无溶剂热解二茂铁和聚乙烯吡咯烷酮(PVP)制备铁系的碳包覆的复合材料。研究了温度,时间,投料比对产物形貌的影响,优化了工艺参数,并通过XRD,SEM等光谱手段对晶体结构和形貌进行了表征。合成的复合材料在催化剂性能评价装置上进行水煤气变换反应催化性能测试。实验表明,在温度为500℃,时间为4h,二茂铁：PVP=1：5时产物形貌为球形,且分散度较好。催化性能测试表明制备出的碳包覆的复合材料有一定的催化性能,但活性不高。通过溶剂热解八羰基二钴和聚乙烯吡咯烷酮(PVP)制备钴系的碳包覆的复合材料。应用本试验中应用的最佳工艺参数,并通过SEM对其形貌进行了表征,结果表明产物均匀垂直生长于基板平面上。催化性能测试表明制备出的碳包覆的复合材料有一定的催化性能,在不同的溶剂体系中催化活性不同。通过溶剂热解二茂铁,八羰基二钴和聚乙烯吡咯烷酮(PVP)制备铁,钴系的碳包覆的复合材料(碳包覆的金属铁酸盐)。应用本试验中应用的最佳工艺参数,并通过XRD,SEM等光谱手段对晶体结构和形貌进行了表征,结果表明PVP过量时,颗粒没有完全生长出,PVP少量时呈现海胆状结构。催化性能测试表明制备出的碳包覆的复合材料有一定的催化性能,但活性不高,耐热性不好。通过搭载煤矸石分子筛,在氮气环境下无溶剂热解制备铁,钴系碳包覆的金属氧化物复合材料和铁钴共存的碳包覆的复合材料,并通过XRD,SEM等光谱手段对晶体结构和形貌进行了表征,SEM结果表明颗粒均匀分散在分子筛的表面。催化性能测试表明制备出的碳包覆的复合材料无催化性能。这种制备方法提供了一种简单的,一步法制备碳包覆的金属氧化物复合材料,并研究其在水煤气变换反应中的催化性能。试验表明碳包覆的复合材料有一定的催化性能,但活性不高。我们将以上方法推广应用到制备碳共包覆的铁,钴系复合材料,并研究其在水煤气变化反应中的催化能力。实验表明二茂铁占主要配比制备出的催化剂的催化性能差,而八羰基二钴占主要配比制备出的催化剂的催化性能较好。搭载煤矸石为载体的催化剂几乎没有活性。
[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，
本文编号：2322090
[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，
本文编号：2322090
本文链接：https://www.wllwen.com/kejilunwen/cailiaohuaxuelunwen/2322090.html
