Promoter effect of Ce and Pr on the catalytic stability of the Ni-Co system for the oxidative steam reforming of ethanol

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

“…The relationship between CFR and WHSV was also investigated, finding a non-linear dependence. Moreover, it is worthwhile noting that several authors [15,65,69], reporting OSR tests for WHSV in the range 40-70 h −1 , measured CFR as higher or comparable (1.3 × 10 −4 and 6.9 × 10 −5 g coke ·g c,fed −1 ·g cat −1 ·h −1 ) to the value recorded over the Pt-Ni/CeO 2 -SiO 2 catalyst at 123 h −1 . The influence of space velocity on CFR can be explained considering that the low contact time is responsible for a reduced extent of coke gasification reaction, per se already slower than the reactions in gaseous phase due to its heterogeneous nature [70].…”

Preparation, modification and development of Ni-based catalysts for catalytic reforming of tar produced from biomass gasification

“…Rare earth oxides (REOs) are widely recognized as redox promoters which can improve the system's electronic properties by increasing the metal-support interaction and the oxygen storage capacity of catalyst [178,179]. Therefore, REOs (such as La 2 O 3 , CeO 2 , Pr 6 O 11 , Sm 2 O 3 , etc.)…”

“…Among different REOs, CeO 2 was considered as a promising promoter of steam reforming catalysts, since CeO 2 exhibited higher catalytic performance than other REOs, such as La and Pr [143,179,183]. The higher activity of CeO 2 in steam reforming reactions can be attributed to the outstanding redox characteristics of high oxygen transfer capability and oxygen storage capacity [102,[187][188][189].…”

“…The higher activity of CeO 2 in steam reforming reactions can be attributed to the outstanding redox characteristics of high oxygen transfer capability and oxygen storage capacity [102,[187][188][189]. Muñoz et al [179,185] showed that the introduction of redox promoters, such as Ce and Pr, improved the reducibility, basicity (in terms of strength) and oxygen mobility of the Ni-Co catalysts. As a consequence, the carbon gasification and WGS reaction were promoted by the addition of REOs.…”

Oxidative steam reforming of ethanol over MxLa2−xCe1.8Ru0.2O7−δ (M = Mg, Ca) catalysts: effect of alkaline earth metal substitution and support on stability and activity

“…27 Various metal oxides, such as perovskite, spinel, hydrotalcites, nano-oxyhydride, and pyrochlore, have been reported for OSRE process. [28][29][30][31][32][33][34][35][36] Chen et al investigated the effect of a LaBO 3 (B ¼ Ni, Co, Fe, Mn) perovskite structure on OSRE. The thermal stability and oxygen vacancies affected the catalytic activity and stability for OSRE.…”