BACKGROUND Methanol to dimethyl ether (MTD) is considered one of the main routes for the production of clean bio-fuel. The effect of copper loading on the catalytic performance of different phases of alumina that formed by calcination at two different temperatures was examined for the dehydration of methanol to dimethyl ether (DME). RESULTS A range of Cu loadings of (1, 2, 4, 6, 10 and 15% Cu...

An in situ technique is employed to tailor the valence states of copper in CuOδ/γ-Al2O3 catalysts with the purpose of inducing superior catalytic performance for simultaneous elimination of NO and CO. The catalyst with zero-valent copper exhibits excellent catalytic performance, which is comparable with the conventional supported noble-metal catalysts.

This work aimed to demonstrate Cu2O/Al2O3 as a catalyst of the photo-Fenton process in UV and visible spectra. Cu2O nanoparticles were synthesized by laser ablation liquid supported on Al2O3. The catalytic activity resulting solid was assessed mineralization bisphenol A (BPA). studied variables type Al2O3α γ, Cu content (0.5 1%), H2O2 concentration (1, 5, 10 times stoichiometric amount). respon...

The Knoevenagel condensation of aromatic aldehydes with barbituric acid, dimedone and malononitrile occurred in the presence of BF3/nano-γ-Al2O3 at room temperature in ethanol. This catalyst is characterized by powder X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), field emission scanning electron microscopy (FESEM) and energy-disper...

By including phonon-assisted transitions within plane-wave density functional theory methods for calculating the x-ray absorption spectrum (XAS), we obtain Al K-edge XAS at 300 K two crystalline Al2O3 phases. The reproduces pre-edge peak α-Al2O3, which is not visible static lattice level of approximation. Configurations from Monte Carlo sampling γ-Al2O3 phase space correctly describe out three ...

The understanding of the structure and properties γ-Al2O3 supported platinum-tin catalysts in oxidizing conditions is prominent importance for many catalytic reactions. By using density functional theory calculations ab initio molecular dynamics simulations, we identify adsorption sites oxygen atoms on a Pt10Sn3/γ-Al2O3(100) cluster model analyze its reconstruction electronic charge redistribut...

CO2 methanation has been evaluated as a means of storing intermittent renewable energy in the form of synthetic natural gas. A range of process parameters suitable for the target application (4720 h-1 to 84 000 h-1 and from 160oC to 320oC) have been investigated at 1 bar and H2/CO2 = 4 over a 10 % Ru/γ-Al2O3 catalyst. Thermodynamic equilibrium was reached at T ≈ 280oC at a GHSV of 4720 h-1. Cyc...