Co-production of hydrogen and carbon nanotubes from the decomposition/reforming of biomass-derived organics over Ni/α-Al2O3 catalyst: Performance of different compounds

Insights into the Reaction Routes for H2 Formation in the Ethanol Steam Reforming on a Catalyst Derived from NiAl2O4 Spinel

“…Additionally, these images show dark particles corresponding to Ni crystals along the carbon nanotubes. The presence of Ni crystals suggests that the carbon nanotubes are formed through the well established tip-growth mechanism, 20 which makes part of the Ni surface accessible for reactants (Ni crystals supported on a carbon structure). However, Ni crystals may be partially trapped in the interior of the nanotubes, reducing the Ni surface available for reactions, which leads to a partial catalyst deactivation.…”

“…Consequently, this carbon formation, with the morphology of nanotubes, can be considered as an opportunity to boost the economy for the H 2 production. 20 The use of low values of temperature (500 °C) would be beneficial for increasing the formation of carbon nanotubes with a high H 2 selectivity ( Figure S4b ). The favored route of ethanol dehydration followed by ethylene decomposition at certain reaction conditions on this catalyst compared to the Ni/Al 2 O 3 catalyst prepared through wet impregnation (as evidenced by the comparison of Figures 4 a and S2 ) would yield a gaseous product stream rich in H 2 , with lower CO 2 formation, because part of the carbon is converted into valuable carbon nanotubes.…”

“… 18 Another peculiar characteristic of Ni is the formation of carbon nanotubes in the ESR. 20 , 21 The formation of these materials is interesting for boosting the process feasibility, because carbon nanotubes are relevant materials for many applications in different fields, from photonics to catalysis. 22 , 23 …”

“…Furthermore, the metal size affects the catalyst performance, and generally, small metal sizes enhance the activity and selectivity for steam reforming reactions and lowers coke deposition . Another peculiar characteristic of Ni is the formation of carbon nanotubes in the ESR. , The formation of these materials is interesting for boosting the process feasibility, because carbon nanotubes are relevant materials for many applications in different fields, from photonics to catalysis. , …”

Thermo-chemical conversion of carbonaceous wastes for CNT and hydrogen production: a review

“…He et al 186 utilized Ni/α-Al 2 O 3 catalyst for catalytic reforming of biomass-derived organics (toluene, 1methylnaphthalene, phenol, ethanol). It was found that phenol and ethanol yielded a higher amount of hydrogen and CNTs than the other two organics, due to the enhancement of oxygen functional group in phenol and ethanol.…”