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New Active and Selective Rh−REOx−Al2O3Catalysts for Ethanol Steam Reforming

“…The activity of the catalyst in the water−gas shift reaction can be assessed using the CO 2 /COx ratio, which is strongly increased with the ReO x −Al 2 O 3 supported catalysts. Among the various rare earth elements, the effect of ceria, alone or in combination with metal oxides and/or transition metals, for promoting the low-temperature activity for the water−gas shift reaction is well-known. − The increased activity for ceria-containing catalysts can be explained by the relatively high reducibility of cerium ions to lower oxidation states, to the high storage capacity and high mobility of oxygen in the support. An enhancement of the activity was also observed with other REO x either in the water−gas shift or in the reverse water−gas shift reaction but was less pronounced.…”

“…[67][68][69][70] The increased activity for ceria-containing catalysts can be explained by the relatively high reducibility of cerium ions to lower oxidation states, to the high storage capacity and high mobility of oxygen in the support. An enhancement of the activity was also observed with other REO x either in the water-gas shift 67 or in the reverse water-gas shift reaction 65 but was less pronounced. However, for rare earth oxides except ceria, only partly reduced species may be invoked.…”

Activity of Co−Mo catalysts supported on alumina modified with La2O3

“…After 2 hours presulfidation the catalysts were exposed to the reaction mixture (49 vol.% 1-12, 49 vol.% CO and 2 vol.% H2S, 1-120 : CO = 1) [11]. % of H2S in H2 flowing with a rate of 50 cm3/min.…”

“…The structure and electronic properties of the support influence the catalytic processes with supported TMS [8][9][10]. In our recent paper [11], where alumina modified with rare earth oxides was applied as support, we reported significant changes in I-IDS, HD and WGS activities of Co-Mo sulfides depending on the rare earth element applied and its concentration. This paper presents results concerning the influence of La203 concentxation in the alumina support applied on the surface properties of Co-Mo sulfide catalysts and their catalytic activity in the WGS reaction.…”

Hydrodesulfurization activities of NiMo catalysts supported on mechanochemically prepared Al-Ce mixed oxides

“…CeO2-based catalysts are particularly used in catalysts for environmental applications [12,[16][17][18]. The presence of cerium in the support (catalyst) also improved the HDS activity of a MoS2/Al2O3 catalyst; however, the effect was detected for only one cerium concentration [19]. The activities of NiMo/TiO2 catalysts with ceria or alumina in the support were higher than those of catalysts prepared on simple supports.…”