Synthesis and characterisation of cement clinker-supported nickel catalyst for glycerol dry reforming

Dry reforming of glycerol over Rh-based ceria and zirconia catalysts: New insights on catalyst activity and stability

“…In the light of these points, Rh/ ZrO 2 and Rh/CeO 2 can be envisioned as promising novel catalysts that can be investigated in GDR process. Along these lines, in the current study, we report Rh-based GDR catalysts which outperform the existing Ni-based ones [17][18][19][20][21][22][23][24] in terms of activity and stability. Furthermore, through in-situ/ex-situ spectroscopic/imaging experiments, for the first time in the literature, we provide valuable insights regarding the origins of catalytic activity, stability, aging and sintering in GDR reaction.…”

“…Since product analysis was done on the basis of gaseous species, it was not possible to calculate glycerol conversion from the molar flow rate of glycerol in the product stream. In this case, as commonly done in the literature [17][18][19][20][21][22][23][24] an atomic balance over hydrogen was conducted to calculate the amount of converted glycerol. Molar flow rates of all gaseous products that contain H atoms were used in the calculation, as shown in Eq.…”

“…Glycerol is a thermally unstable molecule, which tends to decompose at elevated temperatures [14]. It is worth mentioning that noncatalytic/homogenous decomposition of glycerol was often ignored in various former GDR studies in the literature, which resulted in inaccurate determination of catalytic conversion values [17][18][19][20][21][22]. Thus, in order to emphasize this important aspect and to distinguish the relative extents of catalytic and non-catalytic glycerol conversion routes, we performed detailed blank experiments.…”

“…They also reported that presence of CO 2 was essential in reducing carbon deposition through the gasification reactions. Lee et al [21,22] investigated GDR over Ni-based catalysts supported on cement clinker (CC), a material composed mainly of CaO and MgO, with the intention of utilizing CO 2 emitted during cement production. They concluded that use of CC facilitated the suppression of carbon formation.…”

Carbon Dioxide Dry Reforming of Glycerol for Hydrogen Production using Ni/ZrO2 and Ni/CaO as Catalysts

“…The reduction of NiO can be found at temperature of 347-382 °C and 382-428 °C for 15% Ni/CaO, while for 15% Ni/ZrO2 it can be seen at 381-429 °C and 429-519 °C [37]. It was found that 15% Ni/CaO was easier to be reduced comparing to 15% Ni/ZrO2 as it have lower reduction temperature and besides the catalyst have higher oxygen storage capacity which help in preventing the formation of coke deposition [38]. For 15% Ni/CaO, there is reduction peak at 428-614 °C due to reduction of Ni/CaO as in agreement with Lee et al [13].…”