Nguyen Luan, Tao Franklin Feng
Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, USA.
Rev Sci Instrum. 2018 Feb;89(2):024102. doi: 10.1063/1.5003184.
Structure of catalyst nanoparticles dispersed in liquid phase at high temperature under gas phase of reactant(s) at higher pressure (≥5 bars) is important for fundamental understanding of catalytic reactions performed on these catalyst nanoparticles. Most structural characterizations of a catalyst performing catalysis in liquid at high temperature under gas phase at high pressure were performed in an ex situ condition in terms of characterizations before or after catalysis since, from technical point of view, access to the catalyst nanoparticles during catalysis in liquid phase at high temperature under high pressure reactant gas is challenging. Here we designed a reactor which allows us to perform structural characterization using X-ray absorption spectroscopy including X-ray absorption near edge structure spectroscopy and extended X-ray absorption fine structure spectroscopy to study catalyst nanoparticles under harsh catalysis conditions in terms of liquid up to 350 °C under gas phase with a pressure up to 50 bars. This reactor remains nanoparticles of a catalyst homogeneously dispersed in liquid during catalysis and X-ray absorption spectroscopy characterization.
在较高压力（≥5巴）的反应物气相条件下，高温液相中分散的催化剂纳米颗粒的结构对于从根本上理解在这些催化剂纳米颗粒上进行的催化反应至关重要。对于在高温高压气相条件下于液相中进行催化的催化剂，大多数结构表征都是在非原位条件下进行的，即在催化之前或之后进行表征，因为从技术角度来看，在高温高压反应物气体的液相催化过程中获取催化剂纳米颗粒具有挑战性。在此，我们设计了一种反应器，它使我们能够使用X射线吸收光谱（包括X射线吸收近边结构光谱和扩展X射线吸收精细结构光谱）进行结构表征，以研究在高达350°C的液相、高达50巴的气相苛刻催化条件下的催化剂纳米颗粒。该反应器在催化和X射线吸收光谱表征过程中，能使催化剂的纳米颗粒均匀地分散在液体中。
