2,5-Dimethylfuran Production by Catalytic Hydrogenation of 5-Hydroxymethylfurfural Using Ni Supported on AlO-TiO-ZrO Prepared by Sol-Gel Method: The Effect of Hydrogen Donors.

5-Hydroxymethylfurfural (5-HMF) has been described as one of the 12 key platform molecules derived from biomass by the US Department of Energy, and its hydrogenation reaction produces versatile liquid biofuels such as 2,5-dimethylfuran (2,5-DMF). Catalytic hydrogenation from 5-HMF to 2,5-DMF was thoroughly studied on the metal nickel catalysts supported on AlO-TiO-ZrO (Ni/ATZ) mixed oxides using isopropanol and formic acid (FA) as hydrogen donors to find the best conditions of the reaction and hydrogen donor. The influence of metal content (wt%), Ni particle size (nm), Nickel Ni, Ni/NiO and NiO species, metal active sites and acid-based sites on the catalyst surface, and the effect of the hydrogen donor (isopropanol and formic acid) were systematically studied.

γ-Valerolactone Production from Levulinic Acid Hydrogenation Using Ni Supported Nanoparticles: Influence of Tungsten Loading and pH of Synthesis.

γ-Valerolactone (GVL) has been considered an alternative as biofuel in the production of carbon-based chemicals; however, the use of noble metals and corrosive solvents has been a problem. In this work, Ni supported nanocatalysts were prepared to produce γ-Valerolactone from levulinic acid using methanol as solvent at a temperature of 170 °C utilizing 4 MPa of H. Supports were modified at pH 3 using acetic acid (CHCOOH) and pH 9 using ammonium hydroxide (NHOH) with different tungsten (W) loadings (1%, 3%, and 5%) by the Sol-gel method.

Chemical and Structural Changes by Gold Addition Using Recharge Method in NiW/AlO-CeO-TiO Nanomaterials.

NiWAu trimetallic nanoparticles (NPs) on the surface of support AlO-CeO-TiO were synthesized by a three-step synthetic method in which Au NPs were incorporated into presynthesized NiW/AlO-CeO-TiO. The recharge method, also known as the redox method, was used to add 2.5 wt% gold.

Photodegradation of 17 α-methyltestosterone using TiO -Gd and TiO-Sm photocatalysts and simulated solar radiation as an activation source.

According to the search in the state of the art, no antecedents were found in which photocatalytic degradation of 17α-methyltestosterone (MT) hormone has been carried out using doped-TiO. Nor have the transformation products formed during the heterogeneous photocatalysis (FH) been identified. Therefore, in this study we analyzed the photocatalytic degradation of the MT in aqueous solution, using doped TiO with Sm or Gd at 0.

Effect of the CuAlO and CuAlO Phases in Catalytic Wet Air Oxidation of ETBE and TAME using CuO/γ-AlO catalysts.

This paper studies Cu/AlO catalysts, synthesized in two ways: copper deposit in the synthesis of alumina (sol gel) and incipient impregnation stabilized at 400 °C. The materials were characterized by X-ray diffraction studies, nitrogen physisorption, temperature programmed reduction of H, dehydration of isopropanol, scanning electronic microscopy, transmission electronic microscopy, which were evaluated in the liquid phase oxidation reaction of ethyl tert-butyl ether and tert-amyl methyl ether. The formation of CuAlO and CuAlO in the samples synthesized by sol gel, led to a modification of the texture, thus resulting in an expansion of the specific area of the materials.

Effect of gold addition by the recharge method on silver supported catalysts in the catalytic wet air oxidation (CWAO) of phenol.

Catalysts Ag/ZrO-CeO and Au/ZrO-CeO were synthesized by a deposition-precipitation method and Ag-Au/ZrO-CeO was prepared using a recharge method for the second metal (Au). The materials were characterized by physisorption of N, XRD, ICP, UV-vis RDS, H2-TPR, XPS and TEM. The results obtained show that the specific areas for monometallic materials were 29-37 m g and 27-74 m g for bimetallics.

Treatment of phenol by catalytic wet air oxidation: a comparative study of copper and nickel supported on γ-alumina, ceria and γ-alumina-ceria.

Cu, Ni, CuO and NiO catalysts, prepared by wet impregnation with urea and supported on γ-AlO, CeO, and AlO-CeO, were evaluated for Catalytic Wet Air Oxidation (CWAO) of phenol in a batch reactor under a milder condition (120 °C and 10 bar O). The synthesized samples, at their calcined and/or their reduced form, were characterized by XRD, H-TPR, N adsorption-desorption, SEM-EDS and DR-UV-Vis to explain the differences observed in their catalytic activity towards the studied reaction. The influence of the support on the efficiency of CWAO of phenol at 120 °C and 10 bar of pure oxygen has been examined and compared over nickel and copper species.