@article{a1c9e1b7c6494851bc1cf553390bcecf,
title = "Ni-alumina dry reforming catalysts: Atomic layer deposition and the issue of Ni aluminate",
abstract = "A catalyst consisting of 2 wt% Ni supported on a commercially available transition alumina is modified using TMA-H2O ALD cycles to deposit thin alumina overcoats on the catalyst, and it is then investigated for the catalytic dry reforming of methane (DRM) at 700 °C. Highly dispersed Ni rapidly sinters to form bulk Ni particles on the uncoated catalyst. In contrast, deposition of an alumina overcoat by ALD significantly lowers the rate of Ni sintering, and also lowers the propensity towards carbon deposition during DRM. Additionally, it is experimentally demonstrated that the Ni aluminate (NiAl2O4) spinel phase is unstable under the present DRM conditions and slowly undergoes reduction to metallic Ni and Al2O3. Slow reduction of the Ni2+ from NiAl2O4 is proposed as the origin of the large increase in DRM activity observed for the alumina-overcoated Ni catalysts.",
keywords = "Alumina, Atomic layer deposition, Catalyst deactivation, Dry reforming, Nickel aluminate, Sintering",
author = "Patrick Littlewood and Shengsi Liu and Eric Weitz and Marks, {Tobin J.} and Stair, {Peter C.}",
note = "Funding Information: This work was made possible by a NPRP exceptional grant award [ NPRP-EP-X-100-2-024 ] from the Qatar National Research Fund (a member of the Qatar Foundation). The statements made herein are solely the responsibility of the authors. The REACT Core facility acknowledges funding from the Department of Energy (DE-SC0001329) used for the purchase of the Altamira BenchCat 4000. This work made use of the Jerome B. Cohen X-Ray Diffraction Facility supported by the MRSEC program of the National Science Foundation (DMR-1720139) at the Materials Research Center of Northwestern University and the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205). The authors would like to thank the groups of Prof. Kenneth R. Poeppelmeier for use of high temperature furnaces and Prof. Justin M. Notestein for use of UV–vis-DRS equipment. Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",
year = "2020",
month = mar,
day = "1",
doi = "10.1016/j.cattod.2019.03.040",
language = "English (US)",
volume = "343",
pages = "18--25",
journal = "Catalysis Today",
issn = "0920-5861",
publisher = "Elsevier",
}