Reforming of glycerol for hydrogen production over Ni based catalysts: Effect of support type

Exceptionally active and stable catalysts for CO2 reforming of glycerol to syngas

“…Moreover, the common use of Eq. ( 14) in the existing GDR studies [17][18][19][20][21][22][23][24][25][26] allowed direct comparison of the present results with the glycerol conversions reported in the literature. The results reported in the present study were found to be reproducible in all cases, as the difference between the performance metrics (X CO2 , X G and Y i ) of successive experiments remained below 1%.…”

“…Furthermore, superior activity and stability of Rh in dry reforming of hydrocarbons [31][32][33][34][35] inspired us to use it as a benchmark precious metal catalyst for the cheaper, yet promising alternatives, such as Ni and Co. For the first time in the literature, we report superior Rh/AZT and Ni/AZT catalysts both of which can deliver > 90% of the thermodynamic CO 2 and glycerol conversions with negligible activity loss. These catalysts clearly outperform the existing Rh-and Ni-based catalysts previously reported in the literature [17][18][19][20][21][22][23][24][25][26][27][28][29]. In the current work, in addition to activity and stability tests, AZT supported Rh, Ni and Co catalysts were also characterized before and after GDR reaction by means of in-situ/ex-situ spectroscopic/imaging techniques to provide valuable insights regarding the molecular-level origins of catalytic activity and stability.…”

“…Activity tests carried out on the 20% Ni/CC at 750 °C and CO 2 /G = 1.67 gave glycerol conversions up to ˜80% and H 2 /CO < 2 [23,24]. Use of CaO supported Ni for GDR was also investigated by Arif et al [25,26] who comparatively studied 15 wt.% Ni loaded CaO, ZrO 2 and La 2 O 3 supported catalysts. At 700 °C and CO 2 /G = 1, the authors reported glycerol conversions of 30%, 20% and 13% on Ni/CaO, Ni/La 2 O 3 and Ni/ZrO 2 , respectively.…”

“…At 700 °C and CO 2 /G = 1, the authors reported glycerol conversions of 30%, 20% and 13% on Ni/CaO, Ni/La 2 O 3 and Ni/ZrO 2 , respectively. Superiority of Ni/CaO was attributed to the improved metal dispersion and smaller NiO crystallite size on CaO [25,26]. Tavanarad et al [27] studied GDR within 600-750 °C and CO 2 /G = 0-3, on catalysts supported by mesoporous γ-Al 2 O 3 loaded with different amounts of (5, 10, 15 and 20%) Ni.…”

New Insights on Catalytic Valorization of Carbon Dioxide by Conventional and Intensified Processes

“…This phenomenon was due to the CaO support basicity, which causes a number of positive effects, such as (i) reducing carbon accumulation and sintering of the metal particles, (ii) improving the metal dispersion on the support, as well as (iii) improving the metal reducibility and interactions with the support. 215 3.7. Urea Synthesis.…”