Catalytic behavior of lanthana promoted Rh/SiO2 catalysts: influence of the preparation procedure

Combined oxidation and reforming of methane to produce pure H2 in a membrane reactor

“…8) which correspond to the lanthanum disilicate phase La 2 Si 2 O 7 as previously reported by Vidal et al [15]. In this pattern, an overlapping signal at 2Â = 21 • is also observed which corresponds to the mostly amorphous SiO 2 .…”

Synthesis of lanthanum silicate oxyapatite materials as a solid oxide fuel cell electrolyte

“…The high reactivity of the lanthanum oxide against H 2 O and CO 2 , transforming it into lanthanum hydroxide and carbonate, obviously influences its behaviour and the reactions with other compounds as reported by several authors. [13][14][15][16][17][18][19][20][21][22] The aging in ambient air involves a bulk hydroxylation and can also lead to a carbonation reaction. The carbonation process is suggested to occur mainly through the formation of surface carbonates or hydroxycarbonates.…”

Effect of CeO2-addition sequence on the performance of CeO2-modified Ni/Al2O3 catalyst in autothermal reforming of iso-octane

“…On the other hand, it was reported that the introduction sequence of Rh and La 2 O 3 , consecutive or co-impregnation, affected the catalytic activity of Rh/La 2 O 3 / SiO 2 in benzene hydrogenation and n-butane hydrogenolysis reactions [22]. The above results suggest that the catalyst performance can be influenced to different extents by the sequence of introducing the promoter and the active metal component according to the specific cases of catalysts and catalytic reactions.…”