On the structure and surface properties of NiO/MgO–La2O3 catalyst: Influence of the support composition and preparation method

High performance of Mg–La mixed oxides supported Ni catalysts for dry reforming of methane: The effect of crystal structure

“…Several bands in the range of 1830e850 cm À1 are due to adsorption of the La 2 O 2 CO 3 species can be seen on those catalysts containing La 2 O 3 (Fig. 4aef) [23,24]. The appearance of the bands of La 2 O 2 CO 3 species should be due to the reaction of La 2 O 3 with CO 2 during the calcination of catalysts.…”

“…According to the assignments in literature [23,24] Fig. 4(B) shows the in situ DRIFTS spectra of catalysts after exposure to reactant gases CH 4 /CO 2 at 700 C for 12 min.…”

Properties and phase composition of Ni–MgO–La2O3 systems submitted to different thermal treatments

“…The diffractogram of sample NM also shows simultaneous peaks of the MgO phase, which is characteristic of the formation of a magnesium and nickel solid solution (Mg 0.4 Ni 0.6 O) [18]. Table 1 shows the values of the specific surface areas measured using the BET technique.…”

“…3 shows the results of the temperature-programmed reduction (TPR). It is observed that the TPR of sample NL shows an initial peak at 661 K with the maximum consumption of hydrogen, which can be ascribed to the reduction of nickel species that minimally interact with the support, such as NiO that is amorphous to X-rays or to the first stage of perovskite reduction [18,25].…”

“…Some studies of mixed oxides of lanthanum and magnesium obtained from mixtures of the respective oxides have been reported [18]. Systems based on NieMgO and NieLa 2 O 3 are known to form a solid solution (Ni 1Àx Mg x O) and a LaNiO 3 perovskite-type phase, respectively, after thermal decomposition of the precursors [19].…”