The surface chemistry of methylene iodide adsorbed on clean and oxygen-covered Mo(100): formation and chemistry of carbenes

Infrared study of the adsorption of CO and CH3 on silica-supported MoO3 and Mo2C catalysts

“…The band due to CH 3(a) Similarly to the above results ethylene formation (T p = 520 K) was experienced from Mo 2 C/Mo(1 1 1) single crystal surface after adsorption of CH 3 I at 300 K [26]. Ethylene was not evolved from CH 2(a) produced by CH 2 I 2 adsorption on Mo(1 0 0) and oxygen-covered Mo(1 0 0) [27], and on MoO x thin film [28].…”

Bond Forming Reactions Involving C1 Moieties: Late Versus Early Transition Metal Surfaces

“…Methane production is seen in both cases, a clear indication of the potential for vanadium surfaces to promote certain hydrogenation reactions. Similar chemistry has been documented on the surfaces of single-crystals of other transition metals, both for methylene groups on Cu(100) [21], Cu(110) [22], Ag(111) [23], Ni(100) [24], Ni(110) [25], Pd(100) [26], Pt(111) [27][28][29], Rh(111) [30,31], Ru(001) [32,33], Mo(100) [34,35], and Mo(110) [36], and for methyl moieties on Cu(100) [37], Cu(111) [37,38], Cu(110) [22,37], Ni(100) [24,39], Ni(111) [40,41], Ni(110) [42], Pd(100) [43,44], Pt(111) [27,28,45,46], Rh(111) [47,48], Ru(001) [49], Mo(100) [35,50], and Mo(110) [51]. Ethylene production via coupling of methylene is also seen in Fig.…”

The chemistry of methyl iodide on Mo(100): formation and reaction of adsorbed methyl species

“…2) indicates a complete absence of ethylene formation. Note that no dimerization products were found on Mo(100) or oxygencovered Mo(100) following either ethylene [ 11 ] or methylene iodide [ 14] adsorption…”

“…This effect is emphasized by the vertical lines superimposed on the spectra Fig. 2 [14]. Since the methane yield was rather low in this case, deuterated species were used to avmd any possible complications due to H2 adsorption from the background.…”

“…The apparatus used for the temperatureprogrammed desorption experiments has been described in detail elsewhere [14]. Briefly it consists of a 12" diameter, stainless-steel chamber which operates at a base pressure of ~8x 10-11Torr following bakeout.…”