A Pt-Mo hybrid catalyst for furfural transformation

Abstract

Furfural is a high-value chemical, being the precursor of compounds such as furfuryl alcohol and tetrahydrofurfuryl alcohol. Pt is known as active for furfural hydrogenation, but the high price limits its exploitation and imposes the search for alternatives. Here we presented a Pt/Mo bimetallic system with enhanced catalytic activity for furfural hydrogenation. For comparison, monometallic Mo-and Ptsupported on activated carbon have been prepared by impregnation and sol-immobilization. The bimetallic Pt/Mo was prepared impregnating the Mo-AC catalyst with Pt, using Na 2 PtCl 4 as a precursor, PVA, and NaBH 4 as reducing agent. HR-TEM analyses on Pt/Mo catalyst showed Mocontaining agglomerates embedded in the carbon matrix, displaying diffraction fringes with spacing typical of Mo 4 O 11 in the orthorhombic phase, as well as Pt nanoparticles more evenly dispersed in the Mo-AC system compared to bare AC. The Pt/Mo catalyst showed higher activity than both monometallic ones, and it converted 92 % of furfural to furfuryl alcohol and ethyl furfuryl ether with 20 % and 80 % selectivity, respectively. However, despite a lower initial activity, the monometallic Mo/AC catalyst showed a complete selectivity to the ether.

Supported MoOx and WOx Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

“…Hydrogenation using monometallic Pt-based catalysts is wellknown in heterogeneous catalysis, but its high price limits its uses and imposes the search for alternative catalytic systems, especially bimetallic catalysts. Stucchi et al 260 developed an efficient Pt−Mo catalyst supported on activated carbon (AC), which showed higher activity for furfural hydrogenation compared with the monometallic Mo and Pt catalysts. HR-TEM of the Pt−Mo/AC catalyst showed the presence of Mocontaining agglomerates with an Mo 4 O 11 orthorhombic phase as well as uniformly dispersed Pt NPs (about 2 nm) in the carbon matrix.…”

A Career in Catalysis: Laura Prati

“…Bimetallic structures consisting of Mo and Pt already showed higher activity than monometallic ones in the hydrogenolysis of alkanes and the dehydrogenation of cyclohexane . Therefore, Laura investigated the properties of a new Mo supported on activated carbon (AC) as a support for platinum nanoparticles (Pt NPs) …”

“…136 Therefore, Laura investigated the properties of a new Mo supported on activated carbon (AC) as a support for platinum nanoparticles (Pt NPs). 137 Mo-supported AC was prepared by incipient-wetness impregnation method using (NH 4 ) 6 Mo 7 O 24 as metal precursor to have a loading of 40 wt % Mo. Pt NPs were then supported on the 40% Mo@AC by impregnation.…”

Sustainable Solar Light Photodegradation of Diclofenac by Nano- and Micro-Sized SrTiO3

“…The C 1s photopeak comprised four components (C-C, C-O, and C=O bonds, as well as a specific feature corresponding to CO 3 2− ) with respective binding energies of 284.6, 285.9, 287.0, and 289.5 eV (Figure S2). Normalized surface concentrations of all the species were computed by ruling out the contribution of adventitious carbon (C-C at 284.6 eV) [66,79].…”