Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Abstract

Highlights-Efficient Cu-Ni catalysts supported on activated carbon for the water gas shift reaction.-Supressed methanation activity due to the presence of Cu.-Cu-Ni alloy as a key factor of the catalytic design.-Good stability and tolerance towards start/stop situations. AbstractThe water-gas shift (WGS) reaction over structured Cu, Ni, and bimetallic Cu-Ni supported on active carbon (AC) catalysts was investigated. The structured catalysts were prepared in pellets form and applied in the medium range WGS reaction. A good activity in the 180-350 °C temperature range was registered being the bimetallic Cu-Ni:2-1/AC catalyst the best catalyst. Page 2 of 38A c c e p t e d M a n u s c r i p tThe presence of Cu mitigates the methanation activity of Ni favoring the shift process. In addition the active carbon gasification reaction was not observed for the Cu-containing catalyst converting the active carbon in a very convenient support for the WGS reaction. The stability of the bimetallic Cu-Ni:2-1/AC catalyst under continuous operation conditions, as well as its tolerance towards start/stop cycles was also evaluated.

Woven Kevlar Fiber/Polydimethylsiloxane/Reduced Graphene Oxide Composite-Based Personal Thermal Management with Freestanding Cu–Ni Core–Shell Nanowires

“…The Ni 2p 3/2 peak at 852.0 eV corresponded to Ni (0) and peaks at 855.3 and 856.0 eV were attributed to Ni(II) and Ni(III), respectively. 34 Ni(II) and Ni(III) formed oxides and hydroxides as the surface layers of Ni was partly oxidized due to the synthetic process during XPS and exposure to air and the results were analogous to literature. 29 Personal thermal management devices should be efficient heat providers.…”

Ni-based bimetallic heterogeneous catalysts for energy and environmental applications

“…In the last few years, the WSG reaction has been extensively studied over a bimetallic Ni-Cu system where the main concern was to suppress the methanation reaction by increasing the CO adsorption. [216][217][218][219][220][221][222][223] In a recent study, experimental analyses such as CO-TPR-MS, CO-TPD-MS and in situ DRIFTS have proved that the CO adsorption can be enhanced on a Ni-Cu alloy at a high temperature. 220 The Ni-Cu/CeO 2 catalyst with a Ni/Cu ratio of one exhibited a high reaction rate with the least methane formation due to the formation of a Ni-Cu alloy phase.…”

Effects of structure and size of Ni nanocatalysts on hydrogen selectivity via water-gas-shift reaction—A first-principles-based kinetic study

“…Studies [17][18][19][20] performed on a number of monometallic catalysts suggest that Ni would exhibit promising reforming and WGSR activities, compared to Co, Cu, Fe, Ir, Rh, Ru, Pt, and Pd. The natural abundance enables Ni-based catalysts to be an appealing material for practical, large-scale hydrogen production [21][22][23]. For Ni, one of the challenges in heterogeneous catalysis is the tendency to cleave the C-O bond via methanation (as in Eqn.…”