Mechanochemical processing of serpentine with ammonium salts under ambient conditions for CO2 mineralization

An experimental investigation of mesoporous MgO as a potential pre-combustion CO2 sorbent

“…At high temperatures (300-375°C) but constant pressure (50 bars), we observe a slight but continuous decrease in the absorption of CO 2 , which is in congruence with previously reported results [30]. It is well known that at low temperature, the physisorption process dominates but at elevated temperature CO 2 chemisorbs on MgO and thus CO 2 uptake capacity gradually starts decreasing.…”

Thermochemical processing of a South African ultrafine coal fly ash using ammonium sulphate as extracting agent for aluminium extraction

“…The first step of the staged process involved the processing of CFA by thermochemical treatment using (NH 4 ) 2 SO 4 as extracting agent. (NH 4 ) 2 SO 4 is widely available at low-cost and offers the added advantage of being recyclable [20], in comparison to other activating agents such as NaOH and Na 2 CO 3 . Insight on the thermal decomposition of pure (NH 4 ) 2 SO 4 over the temperature range studied was provided elsewhere [26].…”

“…The focus of our group was to identify and test a promising aluminium extraction process that 3 makes use of a widely available, low-cost, recyclable extracting agent. Ammonium sulphate salt ((NH 4 ) 2 SO 4 ) meets all three criteria [20], and its thermal solid-solid reactions with silicate and oxide minerals for elemental extraction have been extensively studied [21][22][23][24][25][26]. Its reaction with CFA has also recently emerged as an area of great interest in China, owing to its advantages over acidic, alkali, and acid-alkali methods [27][28][29].…”

A comparative study of CO2 sorption properties for different oxides

“…Hence, the reported sorption capacities of One of the key factors in gas-solid reaction is the presence of water. There have been several observations when [79] water catalyzed the reaction [80,81]. Figure 5 [78] proposed the reaction mechanism for MgO carbonation in the presence of steam:…”