Characterization of high-temperature calcined lanthanum-modified alumina by X-ray photoelectron spectroscopy and X-ray diffraction

Carbon Dioxide Reforming of Methane over Ni Catalysts Supported on Al2O3 Modified with La2O3, MgO, and CaO

“…This is due to the fact that relatively small pores were filled with La 2 O 3 species favorably, resulting the increase in the average pore diameter. These observations are consistent with the previous results reported in the literature [32,34,35].…”

“…This indicates that low loading of La 2 O 3 retards the decrease of BET surface area of c-Al 2 O 3 during calcination, which shows stabilization effect of La 2 O 3 on c-Al 2 O 3 . It was reported that there exists a maximum BET surface area of La 2 O 3 /Al 2 O 3 composites with the change of La 2 O 3 loading (La/Al ratio) although the La/Al ratio having the maximum BET value is varied from investigators [32,33] depending on different preparation conditions. In addition, with the increase of La 2 O 3 loading, the pore volume and the micropore area of the samples decreased with increasing La 2 O 3 loading [28].…”

“…It is also well established that the stabilization effect is closely related to the phase of the loaded La 2 O 3 , i.e., highly dispersed La species, LaAlO 3 and lanthanum b-Al 2 O 3 , which are determined by sintering temperature and La 2 O 3 loading [32,33,35,40], although the mechanism of the stabilization effect is still ambiguous and has not been fully understood. From the BET results La-1 and Ni-La-1 samples with a La/Al ratio of 0.02 showed the highest surface area among the samples tested.…”

Improved ethanol steam reforming on Rh/Al2O3 catalysts doped with CeO2 or/and La2O3: Influence in reaction pathways including coke formation

“…On the contrary, a different trend was observed on comparing the specific surface area of La-modified alumina. Textural data of the 15LA support showed that lanthanum incorporation to the alumina strongly diminished its specific surface area by the coverage of the pore walls of the ␥-Al 2 O 3 with the lanthanum species [32] and [33]. Fig.…”

H2 production from CH4 decomposition: Regeneration capability and performance of nickel and rhodium oxide catalysts

“…The Ni 2p 1/2 binding energies at 872.9-873.1 eV ( on the surface. The La 3d 5/2 and La 3d 3/2 signals, split by 4.3 eV in two components, which have been assigned to the transfer of an oxygen-centered electron to the empty 4f shell accompanying the ionization process [29]. The corresponding binding energies of La 3d 5/2 peak at 834.5-834.7 eV (Table 4) are lower than those measured for La(OH) 3 and similar to those of La 2 O 3 [30].…”