Selective Hydrogenation of the Carbonyls in Furfural and 5-Hydroxymethylfurfural Catalyzed by PtNi Alloy Supported on SBA-15 in Aqueous Solution Under Mild Conditions

Abstract

Valuable furfuryl alcohol (FFA) and 2,5-dihydroxymethylfuran (DHMF) could be produced by selective hydrogenation of biomass-derived furfural (FF) and 5-hydroxymethylfurfural (HMF) with high atom economy. In this study, SBA-15 (a kind of mesoporous silica molecular sieve)-supported low metal loading (3 wt% total metal content) PtNi alloy catalyst (PtNi/SBA-15) was synthesized via two steps, including the generation of PtNi alloy by hydrothermal method, and the immobilization of PtNi alloy on SBA-15. PtNi/SBA-15 has ordered mesoporous structure with high surface area, and high dispersion of the PtNi alloy with the formation of Ptδ−-Niδ+ surface pairs on SBA-15, which benefit hydrogen activation and selective carbonyl hydrogenation. The selective hydrogenation of FF and HMF over PtNi/SBA-15 in water solvent at 303 K with 1.5 MPa H2 within 2 h, could respectively yield 64.6% FFA with 77.0% selectivity, and 68.2% DHMF with 81.9% selectivity. Besides, PtNi/SBA-15 exhibited a satisfactory water resistance and stability after recycling at least five runs.

Efficient Hydrogenation of Glucose to Polyols over Hydrotalcite-Derived PtNi Alloy Catalyst under Mild Conditions

“…The PtNi/HT catalyst was synthesized via a two-step method, which referred to our previous work with some improvements . In the first step, nano-size PtNi alloys were synthesized via a microwave-assisted hydrothermal method in a microwave synthesis reactor (Monowave 400, Anton Paar).…”

“…For example, the glucose hydrogenation to sorbitol is an important and well-established reaction, which was achieved over Ni-Raney or Pt-based catalysts . Among the metal catalysts, non-noble metals were earth-abundant and inexpensive, but suffered from metal sintering, leaching, and pyrophoricity during the catalytic process as well as moderate catalytic performance under commonly studied reaction conditions. ,− In contrast, noble metals were adopted for efficient hydrogenation of glucose under mild conditions (water as solvent, 373 K and 2 MPa H 2 ), while the scarcity of noble metals and the high catalyst cost restricted widespread industrial applications. , Facing the above dilemma, supported alloy catalysts with bimetallic synergy and highly catalytic performance were synthesized for aldehyde hydrogenation. − In our previous work, a PtNi alloy loaded on SBA-15 catalyst (PtNi/SBA-15) was synthesized to promote the selective hydrogenation of the aldehyde groups on furanic aldehydes . Compared to the Pt or Ni monometallic catalyst, the Pt δ− –Ni δ+ pair on the PtNi alloy further promoted both H 2 activation and adsorption of aldehyde group.…”

Tungsten Promoted Ni/Al2O3 as a Noble-Metal-Free Catalyst for the Conversion of 5-Hydroxymethylfurfural to 1-Hydroxy-2,5-Hexanedione

“…Many studies had focused on the conversion of HMF to various products with potential or practice applications. It was reported that fuels ( Esteves et al, 2020 ) and their additives ( Nagpure et al, 2020 ), polymer monomers ( Duan et al, 2017a ; Elsayed et al, 2020 ; Wang et al, 2020 ; Fulignati et al, 2021 ) and other chemicals ( Ohyama et al, 2017 ; Ramos et al, 2017 ; Wozniak et al, 2019 ; Zhang et al, 2019 ) with the high added value could be produced using HMF as feedstock through catalytic hydrogenation ( Ohyama et al, 2016 ; Ren et al, 2016 ; Yang et al, 2019a ; Long et al, 2019 ; Han et al, 2020 ; Wiesfeld et al, 2020 ; Gao et al, 2021 ), oxidation ( Neatu et al, 2016 ; Martínez-Vargas et al, 2017 ; Deshan et al, 2020 ), etherification ( Che et al, 2015 ) and other catalytic procedures ( Karve et al, 2020 ; Zhang et al, 2021 ).…”

Influence of the Intrinsic Nanocore Environment in a Pd-Metalated Porous Organic Polymer for Catalytic Biomass-Derived Furfural Upgrading

“…In catalytic biomass valorization, furfural (FFR) is considered a potential feedstock and an excellent sustainable energy source due to the large natural abundance of lignocellulose (which could be produced from cellulose and hemicellulose through hydrolysis and dehydration) . Various value-added products and fuel additives such as furfuryl alcohol, tetrahydrofurfuryl alcohol (THFAL), 2-methylfuran (MF), 2-methyl-tetrahydrofuran (Me–THF), and cyclopentanone can be produced from FFR via hydrogenolysis of the hydroxyl and furan ring. − Of all of these products, tetrahydrofuran alcohol (THFAL) is less toxic, degradable, and more stable than other furan compounds and is, therefore, commonly used as a green industrial solvent. Moreover, THFAL can also be transformed into value-added products for the plastics industry, such as 1,5-pentanediol and 1,2-pentanediol. , …”