Study of Ir/WO3/Al2O3 ring opening catalysts

Ring opening of decalin over bifunctional Ni–W carbide/Al2O3–USY catalysts and monofunctional acid Ni–W oxide/Al2O3–USY

“…Recently, the bifunctional catalysts 1,7,8,10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] has been used in the ring opening of naphthenes which showed good performance because of its more acid sites and higher hydrogenation on metal sites. The studies about bifunctional catalysts mainly focused on some noble metal catalyst, 1,[8][9][10]12,[14][15][16][18][19][20][21][24][25][26][28][29][30][31] which are easier sulfur poisoning. 7,32,33 It is reported that transition metal carbide catalysts have shown excellent hydrogenation activity for hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) due to its higher hydrogenation on transition metal sites.…”

Investigating the Surface Structure of γ-Al2O3 Supported WOX Catalysts by High Field 27Al MAS NMR and Electronic Structure Calculations

“…In this work, the γ-Al 2 O 3 supported tungsten oxide (WO X /γ-Al 2 O 3 ) catalysts, which have been extensively used for olefin metathesis as a bifunctional catalyst, ,, were used to investigate the details of the metal–support interaction. Two types of γ-Al 2 O 3 , including a platelike Al 2 O 3 with surface area of 56.9 m 2 /g and a regular Al 2 O 3 with surface area of 217.6 m 2 /g both with varying amount tungsten oxide (WO X ) loadings, were analyzed.…”

“…23,24 To emphasize the contributions from surface species, the 1 H− 27 Al cross-polarization (CP) MAS NMR experiments that are highly surface sensitive can be employed to probe Al sites that are near the surface OH groups. 23,25 In this work, the γ-Al 2 O 3 supported tungsten oxide (WO X /γ-Al 2 O 3 ) catalysts, which have been extensively used for olefin metathesis as a bifunctional catalyst, 8,26,27 were used to investigate the details of the metal−support interaction. Two types of γ-Al 2 O 3 , including a platelike Al 2 O 3 with surface area of 56.9 m 2 /g and a regular Al 2 O 3 with surface area of 217.6 m 2 /g both with varying amount tungsten oxide (WO X ) loadings, were analyzed.…”

PVP-stabilized mono- and bimetallic Ru nanoparticles for selective ring opening

“…This bifunctional catalyst may lead to more effective Ir based catalysts for the RO of other model compounds, such as decalin, tetralin, and alkyl-naphthalenes. 29,30 Although many studies used catalytic RO of MCP as the model compound, its structure is not close enough to real industrial feed molecules; thus, its use as a probe molecule to study the heavy oil upgrading can be questioned. 28 A multiple-ring compound model, indan (benzocyclopentane), has a structure…”