Nassima Kemache

Concrete is a major constituent of our world. Its contributes to building society but is also an important contributor to the global CO2 emissions. The combination of waste concrete recycling and greenhouse gas abatement is obviously an interesting approach. Mineral carbonation is the methodology that allows the use of calcium oxide within the conc...

In the actual context of the greenhouse gases (GHGs) control, the industrial sector must find efficient and practical solutions to reduce their emissions. The feasibility of an aqueous mineral carbonation (MC) process was demonstrated at the laboratory scale under original mild conditions. In the continuity of this research, the process was tested...

Concerns about global warming phenomena induced the development of research about the control of anthropogenic greenhouse gases emissions. The current work studies on the scaling up of aqueous mineral carbonation route to reduce the CO2 emissions at the chimney of industrial emitters. The reactivity of serpentinite in a stirred tank reactor was stu...

Following the promising results obtained on the laboratory scale, an aqueous mineral carbonation process was tested under industrial conditions as part of a pilot project conducted in a cement plant in Quebec. Experiments were conducted using a Parr 18.7 L reactor with cement plant flue gas (14-18 vol.%CO2) and serpentinite tailings as a source of...

Sunflower and canola oils were hardened over a novel sulfur-promoted Pd catalyst. The formulated catalyst comprised of 0.7 wt % palladium nanoparticles promoted with 0.3 wt % sulfur highly dispersed on mesoporous silica SBA-15 (0.7% Pd−0.3% S/SBA-15). The effect of temperature (80−130 °C) and H2 pressure (3.6−9.3 atm) on the activity, selectivity,...

Hydrogenation of vegetable oils using stable catalysts with satisfactory activity and selectivity as well as very low trans fatty acid (TFA) and saturated fatty acid (SFA) production is a challenging task. It is known that unhealthy TEA formation is the result of positional and conjugative isomerization side-reactions occurring during hydrogenation...

Silica-supported nickel catalysts have been prepared by a solventless technique involving the deposition of the [Ni(tmen)(acac)2] precursor from the gas phase. According to UV–vis and IR spectroscopy and to elemental analysis, the initial deposition step results in the grafting of Ni(II) complexes on silanol groups to give predominantly [Ni(acac)2...

Sunflower and canola oils were hydrogenated over a novel sulphur-promoted Pd-catalyst. The Pd-catalyst consisted in 0.7 wt% palladium nanoparticles promoted with 0.3 wt% sulphur highly dispersed on mesoporous silica SBA-15 (0.7%Pd-0.3%S/SBA-15). The effect of temperature (80-130 o C) and H 2 -pressure (3.6-9.3 atm) on the activity, selectivity as w...