Ni/Al coprecipitated catalysts modified with magnesium and copper for the catalytic steam reforming of model compounds from biomass pyrolysis liquids

Hydrogen production from catalytic reforming of the aqueous fraction of pyrolysis bio-oil with modified Ni–Al catalysts

“…5 (b), the lower carbon oxidation peak (350~440˚C) was ascribed to the combustion of amorphous carbon derived from the metal-support interface, while oxidation peak at higher temperature was assigned to filamentous carbon [21,49]. The generation of amorphous carbons could encapsulate the catalytic sites [21,50] during the thermal-chemical conversion process. Therefore, the presence of abundant amorphous carbons on the reacted Ni-Ce-Al, Ni-Ca-Al and Ni-Mn-Al catalysts might be responsible for the reduction of hydrogen production at the initial stage of catalytic reforming of bio-oil (Fig.…”

“…Although, noble metals e.g. Pt and Pd are confirmed to be highly active, nickel-based catalysts have also been extensively researched, since Ni has comparatively lower cost and Ni-based catalysts are effective for O-H and C-C cracking reactions [20][21][22]. In addition, Ni-based catalysts have been reported to have better performance in terms of hydrogen production and catalyst deactivation, compared with other metals such as Co, Fe and Cu, for the steam reforming of acetic acid [23].…”

Hydrogen production from pine and poplar bio-oils by catalytic steam reforming. Influence of the bio-oil composition on the process

“…However, not many of them provide a reliable comparison between hydrogen production and/or coke formation from different oxygenates under similar operating conditions. Bimbela et al [6,7] studied the reactivity of acetic acid, acetol and n-butanol using similar operating conditions over Ni-based catalysts in a fixed bed reactor. Medrano et al [8] compared the catalytic steam reforming of acetic acid and acetol over Ni-based catalysts in a fluidised bed reactor.…”

Steam reforming of biomass tar model compound at relatively low steam-to-carbon condition over CaO-doped nickel–iron alloy supported over iron–alumina catalysts

“…Moreover, it was reported that Ca addition promoted water adsorption and provided abundance of adsorbed OH groups on Ni catalyst which could facilitate the C C break, resulting in higher ethanol conversion [38,39]. It has been reported [44][45][46][47][48] that the surface properties of Ni/Al 2 O 3 systems could be improved by introduction of alkaline earth metal oxides (MgO and CaO) due to the increase of steam-carbon reaction and the neutralization of the acidity of the support to suppress cracking and polymerization reactions. In biomass gasification, it was also reported that basic nature of a catalyst is favorable for tar decomposition catalysts since higher catalyst basicity can enhance the catalyst activity [49].…”