Gallium oxide promoted zeolite catalysts for oxidehydrogenation of propane

Study of Ga modified Cs2.5H1.5PV1Mo11O40 heteropolyoxometallates for propane selective oxidation

“…In the present work we have studied the effect of Ga as a modifier of Cs 2.5 H 1.5 PV 1 Mo 11 O 40 compounds, as Ga is known to be a dehydrogenating element and has been used for propane and butane aromatisation to benzene and xylenes, respectively (cyclar process) [22][23][24] or for propane oxydehydrogenation on Ga/ZSM5 [25] or for propane ammoxidation on Ga/ZSM5 [26]. 11 O 40 sample was synthesized as follows.…”

Synthesis of ferrierite coatings on the FeCrAl substrate

“…Thus a gallosilicate with the ferrierite structure was obtained [11], as well as a purely siliceous analogue [12]. The catalytic reactions proceeding on this zeolite comprise: isomerization of 1-butene, n-octane cracking, NO x removal and oxidative dehydrogenation of propane [13][14][15][16][17][18]. Ferrierite is produced commercially and applied in isomerization of butenes on the industrial scale.…”

Preparation of Oxide, Sulfide and Other Chalcogenide Clusters in Molecular Sieves

“…At gallium oxide contents of 5 wt.%, preservation of zeolite crystallinity after hydrogen treatment was observed by XRD and SEM, and no bulk Ga 2 O 3 was detected [204]. From propane transformation studies it was concluded that, with ferrierite, blocking of the pore entrances by Ga x O y occurs.…”

“…Apart from H-ZSM-5, zeolites USY, H-ferrierite, [B,Al]-Beta and [B,Al]-ZSM-5 have been reacted with Ga 2 O 3 in oxygen or hydrogen at temperatures up to 500°C [201][202][203][204]. At gallium oxide contents of 5 wt.%, preservation of zeolite crystallinity after hydrogen treatment was observed by XRD and SEM, and no bulk Ga 2 O 3 was detected [204].…”

“…For zeolite [B,Al]-ZSM-5, deboronation of the framework and insertion of some gallium into framework positions have been observed by 11 B MAS NMR and IR spectroscopy. Si(OH)Ga units were also detected in USY modified by gallium oxide [201][202][203][204], but not in [B,Al]-Beta [204]. In the Raman spectra of the modified zeolites, bands were present which were also found after reduction of Ga 2 O 3 with metallic gallium [201,202,204].…”