Titania-supported molybdenum oxide combined with Au nanoparticles as a hydrogen-driven deoxydehydration catalyst of diol compounds

Abstract

A heterogenous catalyst for deoxydehydration (DODH) reaction was developed using less expensive Mo than Re as the active center. Combination of Mo with anatase-rich TiO2 and Au as the support...

Hydrodeoxygenation of potential platform chemicals derived from biomass to fuels and chemicals

“…144,145 ReO x -Ag/CeO 2 catalyzed the DODH of 1,4-AHERY with H 2 to produce 2,5-dihydrofuran in high yield (∼88%) with 5% yield of 2,3-dihydrofuran. 147 It was also reported recently that MoO x -Au/ TiO 2 and MoO x -Pd/TiO 2 emerged as good catalysts for the DODH of 1,4-AHERY with H 2 to form 2,5-dihydrofuran (77% yield) 148 and tetrahydrofuran, 148,244 respectively. Although high selectivity was reported, the activity of the MoO x -M/TiO 2 -catalyzed system was significantly lower than that of the ReO x -M/ CeO 2 -catalyzed systems (higher reaction temperature or lower initial reaction rate), because of the intrinsic lower activity of Mo species in DODH than that of Re.…”

“…The general scheme of DODH with H 2 reductant is shown in Fig. 12, and the reported catalysts for this type of reaction are ReO x -Au/CeO 2 , [144][145][146] ReO x -Ag/ CeO 2 , 147 MoO x -Au/TiO 2 , 148 ReO x /C, 149 and CH 3 ReO 3 . 150 Most of these catalysts are bimetallic.…”

Effect of Titania Polymorphs on the Structure and Catalytic Performance of the Pt–WOx/TiO2 Catalyst in Glycerol Hydrogenolysis to 1,3-Propanediol

“…This finding, along with the catalytic results over individual Pt/r-TiO 2 and WO x /r-TiO 2 , unambiguously confirms that when r-TiO 2 is used as the support of Pt, hydrogen spillover from the Pt NPs to the WO x species is highly efficient and does not require direct contact, and the Pt/r-TiO 2 domain plays the role of providing spillover hydrogen atoms, and the WO x domain plays the roles of adsorbing glycerol and the active site for 1,3-PDO formation. Similarly, Tomishige and co-workers reported in a recent work that in 1,4-anhydroerythritol deoxydehydration with H 2 as the reducing agent, the physically mixed MoO x /P25 + Au/P25 catalyst was highly active, while individual MoO x /P25 and Au/P25 were essentially inactive . It was also found that hydrogen spillover from Ni/r-TiO 2 to Ni/a-TiO 2 could take place when they were physically mixed .…”

“…Similarly, Tomishige and co-workers reported in a recent work that in 1,4-anhydroerythritol deoxydehydration with H 2 as the reducing agent, the physically mixed MoO x /P25 + Au/P25 catalyst was highly active, while individual MoO x /P25 and Au/ P25 were essentially inactive. 67 It was also found that hydrogen spillover from Ni/r-TiO 2 to Ni/a-TiO 2 could take place when they were physically mixed. 55 The enhanced activity of the Pt/ r-TiO 2 + WO x /r-TiO 2 catalyst with respect to the Pt−WO x /r-TiO 2 catalyst is attributed to the fact that on monometallic Pt/ r-TiO 2 , the Pt NPs are not blocked by WO x , thus providing more spillover hydrogen atoms for glycerol hydrogenolysis.…”

Bio-based 1,4-butanediol and tetrahydrofuran synthesis: perspective

“…In fact, Mo and Re play a similar role in various catalysts for oxygen removal reactions. For instance, Tomishige et al 105 developed a heterogeneous catalyst for the DODH reaction. The combination of Mo with anatase-rich TiO 2 and Au as the support and promoter for H 2 activation, respectively, can selectively convert 1,4-AHERY to 2,5-DHF, which is a typical DODH model reaction, with H 2 as a reducing agent.…”