Several copper based catalysts were prepared, characterized and evaluated for the hydrogenation of levulinic acid its methyl ester. Among these, nanocomposites Cu–ZrO2 Cu–Al2O3 quantitatively catalyzed ester to give 90–100% selectivity γ-valerolactone in methanol water respectively. Both prepared by co-precipitation method using mixed precursors under controlled conditions. XRD results showed that main active phase reduced catalyst was metallic particle size found be 10–14 nm HRTEM. The...

Ni and NiSn supported on zirconia (ZrO2) indium (In)-incorporated (InZrO2) catalysts were prepared by a wet chemical reduction route tested for hydrogenation of CO2 to methanol in fixed-bed isothermal flow reactor at 250 °C. The mono-metallic (5%Ni/ZrO2) showed very high selectivity methane (99%) during hydrogenation. Introduction Sn this material with the following formulation 5Ni5Sn/ZrO2 (5% Ni-5% Sn/ZrO2) rate formation be 0.0417 μmol/(gcat·s) 54% selectivity. Furthermore, combination...

Various iridium supported carbon catalysts were prepared and screened for the direct hydrogenation of furfural (FFR) to 2-methyl furan (2-MF).

Ionic liquids functionalized with acidic anions, HSO4, ClSO3H, PTSA, TFA (MIm), HSO4 and (NMP) were found to efficiently (99% conversion) catalyze the alcoholysis of furfuryl alcohol (FAL) in presence methanol, ethanol, n-butanol isopropyl (IPA) corresponding levulinic acid esters under mild temperature (90–130 °C) conditions. The extended alkyl chain length [MIm] using 1,4-butane sultone enhanced Brønsted acidity [BMIm-SH][HSO4] catalyst resulting into highest selectivity >95% Me-LA. An...

A bifunctional Ni/MMT catalyst for catalytic transfer hydrogenation of levulinic acid to γ-valerolactone with complete conversion and selectivity.

ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTThe Role of Fugitive Hydrogen Emissions in Selecting CarriersIndranil DuttaIndranil DuttaKAUST Catalysis Center and Division Physical Science Engineering, King Abdullah University Technology, Thuwal 23955-6900, Saudi ArabiaMore by Indranil Duttahttps://orcid.org/0000-0003-0845-9193, Rajesh Kumar ParsapurRajesh ParsapurKAUST Parsapurhttps://orcid.org/0000-0002-0042-8942, Sudipta ChatterjeeSudipta ChatterjeeKAUST ArabiaDepartment Chemistry, Birla...

Furfural (FFR) was selectively hydrogenated in a single pot to tetrahydrofurfuryl alcohol (THFAL) over Si–MFI molecular sieve supported Pd catalyst. Studies on catalyst screening revealed that both the metal function and support were critical for directing selectivity ring-hydrogenated product, THFAL. The structural feature of MFI as shown by XRD completely retained used sample 3% Pd/MFI confirming its stability under reaction conditions. XRD, along with SEM characterization samples,...

Levulinic acid was completely and selectively converted to GVL, in the presence of formic over an Ag–Ni/ZrO2 catalyst. The synergism between Ag Ni transfer hydrogenation eliminates need for external hydrogen, making process safer. magnetic nature catalyst offers easy recovery efficient recycling. This approach is standardized several C3–C6 platform molecules aqueous medium.

Various noble metal catalysts were screened in a batch operation for furfural (FFR) single-step decarbonylation and hydrogenation reaction to obtain THF high selectivity. Among these, the 3% Pd/C showed complete FFR conversion with total of 80% selectivity ring hydrogenated products including tetrahydrofuran (THF). The order activity exhibited by other metals was Pt/C > Re/C Ru/C. Although highest activity, its ability least (24%) major product 66% furfuryl alcohol (FAL). Similarly, Cu...

The dehydrogenation of formic acid can provide an efficient pathway for hydrogen generation in the presence a suitable catalyst. Homogeneous catalysts have been extensively studied and utilized highly active selective processes compared to conventional heterogeneous catalysis, which often shows lower reactivity selectivity. However, latter is preferred practical applications, considering its easy separation recyclability. By incorporating homogeneous organometallic complex on appropriate...

The screening of copper chromite catalysts with various promoters such as Al, Zn, and Ba for glycerol hydrogenolysis to 1,2-propanediol (1,2-PDO) in a batch reaction showed that Cu−Cr (Ba) catalyst gave the highest conversion 34% selectivity 84% 1,2-PDO. In continuous operation (23 g bed) same higher 1,2-PDO 65% >90%, respectively, an on-stream activity ∼800 h. Better performance could be due situ activation catalyst, suppression cracking ethylene glycol, well excessive hydrogenation...

Copper (Cu) nanocomposite catalysts with gallium (Ga) and aluminum (Al) were prepared using the simultaneous co-precipitation digestion method. The characterized by N2 adsorption, N2O titration, XRD (X-ray diffraction), H2-TPR (H2 temperature-programmed reduction), XPS photoelectron spectroscopy), CO2-TPD (CO2 desorption) techniques, CO2 hydrogenation to methanol synthesis was performed. use of Ga in Cu enhanced weak basic sites more than Al. With CuGa formation, catalyst showed a sequential...

Enhancing the CO₂ uptake and selectivity of keto-enamine-based COFs by chlorination.

Bimetallic nanoparticles have diverse applications in catalytic processes owing to the differences individual properties that contribute their increased activity. To further improve efficiency, they are dispersed an inert support enhances activity toward organic transformations. In this study, we report simple, facile, and cost-effective chemical route for fabrication of nanocomposites with Fe–Ni bimetallic supported on montmorillonite (MMT) possessing variation Fe Ni content. These...

The highly efficient reductive amination of aldehydes with ammonia (NH 3 ) and hydrogen (H 2 to form secondary imines is described, as well the dehydrogenative homocoupling benzyl amines.

Nonoxidative dehydrogenation of methanol to methyl formate over a CuMgO-based catalyst was investigated. Although the active site is metallic copper (Cu0), best reaction conditions were obtained by tuning ratio Cu/Mg and doping with 1 wt % Pd achieve very specific activity for synthesis. On basis CO2 temperature-programmed desorption study, basic strength plays role in efficient conversion via dehydrogenation. These catalysts show excellent thermal stability during regeneration processes....

Abstract 2‐Methyltetrahydrofuran is a valuable commercial product that can be obtained by direct hydrogenation of furfural. In the present study, among several carbon supported bimetallic Ir−Ni catalysts with different loadings screened, 4% Ir‐4% Ni/C catalyst showed excellent activity in terms conversion (99%) to 2‐MeTHF maximum selectivity ∼74% at 220 °C and 750 psig, suppressing formation side chain as well ring opening products. The catalytic was found mainly affected preparation...

Abstract The hydrogenation of CO 2 to oxygenates (methanol and dimethyl ether; DME) was investigated over bifunctional supported Cu catalysts promoted with Ga. Cu‐Ga nanocomposite were characterized by using XRD, TEM energy dispersive X‐ray spectroscopy, photoelectron H temperature‐programmed reduction. In comparison Cu‐SBA‐15‐based catalysts, the Ga‐promoted catalyst prepared urea deposition method (Cu‐Ga/SBA‐15‐UDP) more active selective for oxygenates. use Ga as promoter led increased...

Abstract Zeolites hold importance as catalysts and membranes across numerous industrial processes that produce most of the world's fuels chemicals. In zeolite catalysis, rate molecular diffusion inside micropore channels defines catalyst's longevity selectivity, thereby influencing catalytic efficiency. Decreasing pathlengths zeolites to nanoscopic level by fabricating well‐organized hierarchically porous architecture can efficiently overcome their intrinsic mass‐transfer limitations without...