Ce_1−xSr_xO_2−δ solid solution supports cobalt-based catalysts for hydrogen production via auto-thermal reforming of acetic acid

Abstract

Auto-thermal reforming (ATR) is an effective route to extract hydrogen from acetic acid (HAc) derived from biomass. However, carbon deposition and sintering of cobalt metal are main concerns which lead...

Solid solution-type Sm–Pr–O supported nickel-based catalysts for auto-thermal reforming of acetic acid: the role of Pr in solid solution

“…3 Acetic acid (HAc) is the main component (with content up to 33 wt%) in the aqueous phase of biomass oil and is an ideal feedstock for reforming into hydrogen. 4,5 By introducing O 2 and H 2 O in the reforming process, the process of auto-thermal reforming (ATR) of HAc (eqn (1)) can enhance the efficiency of hydrogen production with reaction heat balance. 6 CH 3 COOH + 1.4H 2 O + 0.28O 2 -2CO 2 + 3.44H 2 DH 0 = 0 (1) Ni-based catalysts are known for their high reactivity in activating C-C and C-H bonds, and are widely applied in catalytic reforming processes.…”

Interface of Ni-MgCr2O4 Spinel Promotes the Autothermal Reforming of Acetic Acid through Accelerated Oxidation of Carbon-Containing Intermediate Species

“…14 In our previous studies, the structure−performance relationships of various Ni-or Co-based catalysts were explored to guide the design of the catalyst structure. 15,16 It is reasonable to demonstrate that increasing the dispersion of the active metal along with enhancing the interaction between Ni/Co particle-support is crucial to resisting sintering. 17,18 Besides, the oxidation of Ni 0 was proved to be inhibited by the electron transformation from WO 2 to the Ni on the WO 2 −Ni interface, elucidating that the construction of electron transfer between the Ni particle and the support effectively facilitated the antioxidant capacity of the catalysts.…”

“…In contrast to endothermic SR with the requirement of high external heat energy and exothermic CPOX with a low hydrogen yield, the ATR process, which balances the reaction heat through regulating oxygen in feed, presents a higher energy efficiency and shows economical preferability. , Nonprecious metal catalysts, such as nickel-based catalysts, have been widely investigated due to their excellent activity in cleavage of C–C and C–H bonds within hydrocarbons for the reforming process. − Nevertheless, with O 2 in the feed of ATR, the active metal can be easily sintered and oxidized; besides, more significantly, carbon deposition is the main deactivation cause of nickel-based catalysts, which is specifically prominent when acetic acid is in the feed, due to the oxygenated nature of pyrolysis volatiles (eqs –) . In our previous studies, the structure–performance relationships of various Ni- or Co-based catalysts were explored to guide the design of the catalyst structure. , It is reasonable to demonstrate that increasing the dispersion of the active metal along with enhancing the interaction between Ni/Co particle-support is crucial to resisting sintering. , Besides, the oxidation of Ni 0 was proved to be inhibited by the electron transformation from WO 2 to the Ni on the WO 2 –Ni interface, elucidating that the construction of electron transfer between the Ni particle and the support effectively facilitated the antioxidant capacity of the catalysts . However, although these catalysts exhibit high reactivity through designing catalysts based on the mechanism of sintering and oxidation, the mechanism related to carbon has not yet been investigated well, which is essential to improving the stability in ATR.…”