具有特定性能的喷雾干燥镍催化剂用于二氧化碳甲烷化

Bjarne Kreitz, Aurina Martínez Arias, Jan M. L. Martin, A. Weber, T. Turek
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引用次数: 8

摘要

一种催化剂生产方法,能够独立定制催化剂的结构特性,如孔径、金属粒度、金属负载或表面积,从而提高催化过程的效率。这种调整可以帮助在镍催化剂上将二氧化碳转化为合成燃料,与传统的化石燃料生产相竞争。在这项工作中,采用一种新的喷雾干燥方法制备了性能可调的SiO2和Al2O3纳米颗粒负载的Ni催化剂。研究了载体的主要粒径、不同的金属负载和热处理对催化剂性能的影响。采用x射线衍射、程序升温还原和化学吸附等物理和化学表征方法对催化剂进行了表征。采用温度扫描技术对CO2甲烷化催化剂进行了筛选。采用喷雾干燥的方法,制备了组织良好的多孔球形纳米颗粒,这些纳米颗粒由高度分散的二氧化硅支撑,具有可调的性能。此外,孔径、金属粒度和金属负载可以独立控制,从而可以生产出具有所需性能的催化剂颗粒。制备的Ni/SiO2催化剂的比表面积高达40 m2 g−1,Ni晶体在4 nm范围内,具有较高的CO2甲烷化活性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spray-Dried Ni Catalysts with Tailored Properties for CO2 Methanation
A catalyst production method that enables the independent tailoring of structural properties of the catalyst, such as pore size, metal particle size, metal loading or surface area, allows increasing the efficiency of a catalytic process. Such tailoring can help to make the valorization of CO2 into synthetic fuels on Ni catalysts competitive to conventional fossil fuel production. In this work, a new spray-drying method was used to produce Ni catalysts supported on SiO2 as well as Al2O3 nanoparticles with tunable properties. The influence of the primary particle size of the support, different metal loadings, and heat treatments were applied to investigate the potential to tailor the catalyst properties. The catalysts were examined with physical and chemical characterization methods, including X-ray diffraction, temperature-programmed reduction, and chemisorption. A temperature-scanning technique was applied to screen the catalysts for the CO2 methanation. With the spray-drying method presented here, well organized porous spherical nanoparticles of highly dispersed NiO nanoparticles supported on silica with tunable properties were produced and characterized. Moreover, the pore size, metal particle size, and metal loading can be controlled independently, which allows to produce catalyst particles with desired properties. Ni/SiO2 catalysts with surface areas of up to 40 m2 g−1 with Ni crystals in the range of 4 nm were produced, which exhibited a high activity for the CO2 methanation.
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