Selective hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran on Ru–MoO_x/C catalysts

Abstract

Selective hydrogenation of 5-hydroxymethylfurfural (HMF) has potential application in high quality biofuels.Herein, the catalytic hydrodeoxygenation (HDO) of HMF to 2,5-dimethylfuran (DMF) was investigated using bi-functional Ru-MoO x /C catalyst prepared by initial wetness impregnation. The high dispersion and electronic transfer between Ru and MoO x were demonstrated by a series of characterization techniques.During this HDO process, the synergy effect between metallic Ru and acidic MoO x species in the RuMoO x /C catalyst plays an essential role in obtaining maximized target product DMF (79.4%) via effective aldehyde group hydrogenation by Ru followed by dehydration over MoO x . This work also elucidated that DMF production proceeded through two distinct pathways: the 2,5-hydroxymethyl furan intermediate was preferable by the aldehyde group hydrogenation of HMF over the Ru-MoO x /C catalyst. Over MoO x / C catalyst, comparatively, 5-methyl furfural was the key intermediate by direct hydrogenolysis of the hydroxyl group in HMF. This kind of catalyst is stable for the first two runs by maintaining the target product yield. After the third run, the catalyst showed deactivation gradually but could be almost completely recovered after regeneration by H 2 reduction.

Influence of Impregnation Processes on Ruthenium–Molybdenum Carbon Catalysts for Selective Hydrodeoxygenation of Biomass‐Derived Sorbitol into Renewable Alkanes

“…Previous studies conducted over Ru catalysts suggested that Ru catalysts alone presented almost little acidity, but that MoO x loading would enhance the total acidity of the catalysts (Table S3, Supporting Information) . Therefore, the surface acidity of ruthenium–molybdenum catalysts was evaluated by NH 3 ‐TPD.…”

Synthesis of Biomass‐Derived Ethers for Use as Fuels and Lubricants

“…[142] Methyl furfuryl alcohol (MFA) can be produced from HMF via selectiveh ydrogenation over aR u-MoO x /C catalyst. [143] The etherification of MFAw ith ethanol to produce 2-(ethoxymethyl)-5-methylfuran (EMMF)w as achieved overA mberlyst 15.…”

Influence of acid pretreatment on the hydrodeoxygenation performance of carbon supported RuMo bimetallic catalysts on sorbitol conversion

“…RuMo/C-N also presented a low temperature peak was at the range of 200-400 °C, and a high broad peak evolving at above 500 °C. Generally, the low temperature peak could be attributed to the reduction of RuO x and MoO x species, and the high temperature peak could be assigned to the [22,25]. Obviously, the range of these peaks did not overlap with RuMo/C catalyst, indicating that the reducibility of RuMo bimetallic catalyst was affected by the acid pretreatment of carbon supports.…”

“…Our group aimed to directly convert biomass into renewable alkanes on trickle-bed reactor over carbon supported Ru-Mo bimetallic catalyst due to the relative cheap and hydrothermal stability of materials. To date, several attempts have been made to optimize the hydrodeoxygenation performance over carbon supported catalysts, such as adjusting the Ru/Mo composition and screening additives [21][22][23][24][25]. The purpose of this study was to investigate the influence of acid pretreatment on physicochemical properties and hydrodeoxygenation performance of carbon supported Ru-Mo bimetallic catalysts.…”