Intermediate species on zirconia supported methanol aerogel catalysts V. Adsorption of methanol

Understanding the active copper sites of Cu/ZrO2 catalyst applied to direct conversion of ethanol to ethyl acetate and hydrogen

“…The spectra of adsorbed CO in the ZrO 2 spectral region (1750 -1150 cm -1 ) are shown in Figure 3C for the Cu/ZrO 2 catalyst. Analogously to the interaction of CO 2 with ZrO 2 , the formation of carbonate and bicarbonate species could be an indication of surface basicity associated with the presence of oxygen atoms (Hertl, 1989) (Bianchi et al, 1994;Pokrovski et al, 2001). The band at 1493 cm -1 could be associated with the formation of ionic bicarbonate species (i-HCO 3 -).…”

“…The formation of OH groups on the monoclinic ZrO 2 surface is assumed to be predominantly terminal (Bianchi et al, 1994;Jung and Bell, 2000). Carbonate structures are formed via interaction of the oxygen in CO with Zr 4+ cations in the lattice, as well as with a surface oxygen atom (Bianchi et al, 1994;Jung and Bell, 2000). The bidentate carbonate surface complexes involve acid-base pair sites (cus Zr 4+ -O 2-centers), while the monodentate carbonates involve strongly basic cus O 2-centers (Cerrato et al, 1997;Bachiller-Baeza et al, 1998;Cosimo et al, 1998).…”

“…The bicarbonate species are usually formed by adsorption of CO onto basic hydroxyl groups. The formation of OH groups on the monoclinic ZrO 2 surface is assumed to be predominantly terminal (Bianchi et al, 1994;Jung and Bell, 2000). Carbonate structures are formed via interaction of the oxygen in CO with Zr 4+ cations in the lattice, as well as with a surface oxygen atom (Bianchi et al, 1994;Jung and Bell, 2000).…”

Latest Advances in the Catalytic Hydrogenation of Carbon Dioxide to Methanol/Dimethylether

“…In addition, it must be stressed that oxide promoters feature a peculiar surface affinity to either CO 2 or H 2 molecule that can further contribute to shape the functionality of multicomponent catalytic systems [28,29,36,[75][76][77][78][79]. Although this partially explains the high uncertainty on active sites in charge of the various surface functionalities of promoted Cu catalysts [2][3][4] and despite the similar physico-chemical characteristics of catalysts for methanol synthesis (MS), water gas shift (WGS), methanol steam reforming (MSR) and methanol decomposition (MD) processes [2,4,43,44,[80][81][82][83][84] and composition and redox potential of the reacting atmosphere also influence morphology and chemical state of Cu particles indeed [85,86].…”

A New Method of Low Temperature Methanol Synthesis

“…At first, the adsorbed species on the surface of Cu/ZnO catalyst was studied in detail. The summary of assignments is given in Table 13 and Table 14 from experiment and the literatures [30,[59][60][61][62][63][64][65][66][67][68][69]. Based on the observation above, a possible mechanism is offered as a scheme of Fig.…”