Promotional effect of Pt on non-oxidative methane transformation over Mo-HZSM-5 catalyst

Non-oxidative dehydroaromatization of methane: an effective reaction–regeneration cyclic operation for catalyst life extension

“…Molybdenum incorporation produces a decrease of the BET surface and the micropore surface and volume in comparison with the parent sample. This fact is mainly attributed to partial blocking of the micropores by the supported MoO3 particles and to the migration of the Mo species into the channels during the calcination by decomposition of the ammonium heptamolybdate (AHM) used as molybdenum precursor [54][55][56][57][58] . The driving force of this molybdenum migration inside of the microporous structure has been related to the presence of Brønsted acid sites, since the MoO3 reacts stoichiometrically 1:1 with H + atoms at exchange sites to form (MoO2(OH)) + species 54,59 , which are the precursors to the active MoC sites required for catalytic C-H bond activation 43 .…”

“…Structural integrity of the zeolite is preserved after metal impregnation and diffraction peaks related to the presence of MoO3 are not detected, indicating a high dispersion degree of the Mo species on the zeolite surface 55,57 according to the XRD patterns (see Figure S1-A in Supplementary material) and the SEM images obtained with a backscatter electron (BSE) detector ( Figure S2-A1,A2).…”

Conversion of Methane to Benzene over Transition Metal Ion ZSM-5 Zeolites

“…Several recent studies have demonstrated that methane can be converted to benzene in the absence of an oxidant, such as oxygen, and the main literature results are summarized in Table 1 (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). It is clear that different transition metal ions (TMI's), such as Mo, Cu, Zn, and Cr, are able to activate methane and that Mo/ H-ZSM-5 is the most promising catalytic system.…”

Comparison of Two Preparation Methods on Catalytic Activity and Selectivity of Ru-Mo/HZSM5 for Methane Dehydroaromatization

“…Since its first report in 1993 [1], however, methane dehydroaromatization continues to be a challenge from both scientific (nature of catalyst active sites) and industrial (catalyst activity and stability) points of view [1][2][3][4][5][6][7][8][9]. The most promising catalyst is Mo/HZSM5 [1,[10][11][12][13]. Dehydroaromatization of methane on Mo-zeolite catalysts has been proposed to follow an initial induction period during which Mo is reduced to molybdenum carbide (MoC x ).…”