Partial oxidation of methane over high coke-resistant bimetallic Pt-Ni/CeO2 catalyst: Profound influence of Pt addition on stability

Improving the Coke Resistance of Ni‐Ceria Catalysts for Partial Oxidation of Methane to Syngas: Experimental and Computational Study

“…The reason behind this is the easy formation of oxygen vacancy (V o , always companied by Ce 3+ ) in CeO 2 , these oxygen vacancies play a crucial role in the catalysis of methane partial oxidation [47] . In our very recent report also, we have shown that the surface Ce 3+ /Ce 4+ ratio plays an important role, the greater the ratio, the greater the tendency for the catalyst to resist the coke deposition during the CPOM reaction [48] . Recently, Galvan and coworkers conducted extensive research on the Ni, and Ni−Rh‐based catalysts that supported various supports (CeO 2 , MgO, ZrO 2 , and Al 2 O 3 ) for the CPOX reaction.…”

“…Very recently, Khatun et al . reported the Ni−Pt/CeO 2 catalyst synthesized via the complex citric acid combustion method [48] . The Ni and Pt metal was found to be replacing some of the Ce atoms, which resulted in the formation of the active Ce−O−[Ni−Pt]−O‐ site, showing high activity and stability (∼500 h) for the CPOM reaction.…”

“…The CÀ H, RuÀ H, and RuÀ C bond lengths for the methane CÀ H activation TS (Figure 13g') were calculated to be 1.9 Å, 1.8 Å, and 2.8 Å, respectively, indicating a more stable TS. Due to the higher stabilization of the methane CÀ H activation TS, a lower activation barrier (128.9 kJ/mol) was NiÀ Pt/CeO 2 Citric acid complex combustion 800 99 500 [48] NiÀ CeLa oxide Impregnation 800 95 25 [67] RhÀ CeO 2 Incipient wetness 800 83 22 [68] Pt/CeO 2 Controlled deposition 800 97 60 [69] Pt/MgAl 2 O 4 Hydrothermal Solvolysis 900 97 500 [70] NiÀ Yb/Al 2 O 3 Consecutive Impregnation 700 92 160 [71] CeO 2 @MNA Wetness Inpregnation 850 94 35 [72] Ni/CeO 2 Hydrothermal 700 98 84 [50] NiÀ 6). The formation of coke during the CPOM reaction is a critical issue and the main bottleneck for the successful commercial implementation of this process.…”

“…[47] In our very recent report also, we have shown that the surface Ce 3 + /Ce 4 + ratio plays an important role, the greater the ratio, the greater the tendency for the catalyst to resist the coke deposition during the CPOM reaction. [48] Recently, Galvan and coworkers conducted extensive research on the Ni, and NiÀ Rh-based catalysts that supported various supports (CeO 2 , MgO, ZrO 2 , and Al 2 O 3 ) for the CPOX reaction. They have found that catalysts with CeO 2 support were highly active and stable due to their oxygen storage capacity.…”

“…A series of Ni‐based bimetallic catalysts with varying amounts of noble metals (0.25 and 0.5 wt%) and Ni (5 wt%) remained constant. All the monometallic and bimetallic catalysts were prepared using a controlled deposition method, which is easy to scale up for future industrial applications compared to the complex citric acid combustion synthesis method [48] or the hydrothermal [50] method used previously. All the as‐prepared catalysts were characterized and checked for their catalytic activity toward the CPOM reaction.…”