Effect of crystallisation on the reaction kinetics of nickel reduction by hydrogen

Kinetic modelling of nickel powder precipitation by high-pressure hydrogen reduction

“…Recent investigations have largely focussed on studying the precipitation mechanisms, reaction kinetics, thermodynamic modelling of ammoniacal nickel sulphate solutions and the effect of impurities on the precipitation process. Reaction kinetics have been studied by use of experimental precipitation studies (Li, 1992;Zhang and Lewis, 2006) and electrochemical experimental and modelling studies (Sobol, 1993;Osseo-Asare, 2003). Thermodynamic modelling of ammoniacal nickel sulphate solutions has been used to predict the operational region where precipitation of crystalline salts, which is highly undesirable, is not thermodynamically feasible (Kolhinen and Jalkanen, 2005).…”

Large-scale controllable preparation and performance of hierarchical nickel microstructures by a seed-mediated solution hydrogen reduction route

“…In general, the seed-mediated growth of metal particles has several recognized characteristics. [32][33][34][35][36][37][38] The studies mainly focused on principal phenomena, procedures, catalysts and reaction kinetics. In the seed-mediated growth, the selection of the reducing agent is of great concern, because strong reducing agents can generate new crystal nuclei in solution, which leads to an undesirable size distribution.…”

“…31 Toward the goal, a solution-hydrogen strategy has been developed to industrially produce metallic nickel and other metals from salt solutions by hydrogen reduction, which is an economical and environmentally benign method. [32][33][34][35][36][37][38] The studies mainly focused on principal phenomena, procedures, catalysts and reaction kinetics. However, few studies were reported about the controllable synthesis and structure-dependent properties of metallic nickel and other metals.…”