Comparison of pyrite-phase transition metal sulfides for capturing leaked high concentrations of gaseous elemental mercury in indoor air: Mechanism and adsorption/desorption kinetics

Tuning CO2 hydrogenation selectivity on Ni/TiO2 catalysts via sulfur addition

“…The Ni 2p 3/2 core-level spectrum of the 10% Ni–S/TiO 2 catalyst is significantly different (Fig. 4b), showing a very small contribution of Ni 0 (852.6 eV) and an intense peak at 856.3 eV, which could arise from Ni(OH) 2 , NiS (855.7 eV), 47 Ni 3 S 2 (855.7–856.1 eV) 48,49 and/or NiS 2 (855.7–855.9 eV). 50,51 The Ni/S surface atomic ratios of the 10% Ni–S/TiO 2 catalyst allow the calculation of an atomic% of S related to Ni of 7.6% (in good accordance with the values obtained from elemental and EDX analyses) that precludes the exclusive formation of NiS.…”