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Author: Ha, Quan Luu Manh × WGL Institute: LIKAT ×

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    Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane
    (Basel : MDPI, 2017-5-16) Ha, Quan Luu Manh; Armbruster, Udo; Atia, Hanan; Schneider, Matthias; Lund, Henrik; Agostini, Giovanni; Radnik, Jörg; Vuong, Huyen Thanh; Martin, Andreas
    Methane dry reforming (DRM) was investigated over highly active Ni catalysts with low metal content (2.5 wt %) supported on Mg-Al mixed oxide. The aim was to minimize carbon deposition and metal sites agglomeration on the working catalyst which are known to cause catalyst deactivation. The solids were characterized using N2 adsorption, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The results showed that MgO-Al2O3 solid solution phases are obtained when calcining Mg-Al hydrotalcite precursor in the temperature range of 550–800 °C. Such phases contribute to the high activity of catalysts with low Ni content even at low temperature (500 °C). Modifying the catalyst preparation with citric acid significantly slows the coking rate and reduces the size of large octahedrally coordinated NiO-like domains, which may easily agglomerate on the surface during DRM. The most effective Ni catalyst shows a stable DRM course over 60 h at high weight hourly space velocity with very low coke deposition. This is a promising result for considering such catalyst systems for further development of an industrial DRM technology.
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    Development of Highly Stable Low Ni Content Catalyst for Dry Reforming of CH4-Rich Feedstocks
    (Weinheim : WILEY-VCH Verlag, 2020) Ha, Quan Luu Manh; Lund, Henrik; Kreyenschulte, Carsten; Bartling, Stephan; Atia, Hanan; Vuong, Than Huyen; Wohlrab, Sebastian; Armbruster, Udo
    Highly active and coking-resistant Ni catalysts suited for the dry reforming of CH4-rich gases (70 vol %, e. g. biogas or sour natural gas) were prepared starting from a Mg-rich Mg−Al hydrotalcite support precursor. Calcination at 1000 °C yields two phases, MgO and MgAl2O4 spinel. Complexation-deposition of Ni with citric acid on the preformed support as well as lanthanum addition yields a catalyst with remarkably low carbon accumulation over 100 h on stream attributed to both high Ni dispersion and preferred interactions of Ni with MgO on MgAl2O4. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.