The direct reductive amination of carbonyl compounds with NH3 and H2 is an alternative route to produce primary amines in practical production. The search for efficient and selective catalysts has attracted great interest. In the present work, the reductive amination of heptaldehyde with NH3 was investigated over a Ru-based catalyst. The product selectivities were found to be related with the s...

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...

Catalysts have an essential role in chemical processes because they can control reactions and produce the desired product. In general, catalysts function to speed up that take place by lowering activation energy. By decreasing energy, minimum energy required for collision is reduced so reaction occur faster. Selection of suitable material be used as a catalyst effort must made achieve successfu...

Nano-size maghemite (γ-Fe2O3) particles were prepared in one step using ultrasound radiation. The obtained nanoparticles were characterized by SEM, TEM , XRD, FTIR, and VSM. The results revealed that the synthesized nanoparticles were spherical, mono-dispersed and uniform. Furthermore, the crystalline structure of nanoparticles endorsed by X-ray diffraction study. The FTIR spectra have provided...

In this study, the ability of ozone to oxidise toluene present in low levels into CO and CO2 was studied. The catalytic ozonation carried out a micro-fixed bed reactor. oxidation done two steps: adsorption on catalyst followed by sequential desorption. Toluene breakdown at temperature atmospheric pressure achieved using γ-Al2O3 supported transition metal oxides impregnated with reduced noble me...

ABSTRACT
 
 Two macro-roughness patterns namely spiral grooving and diamond knurling were performed on an AISI/SAE 1045 cylindrical steel bar. Al2O3 + 13 wt.-% TiO2 powder was deposited by utilizing a multi-pass torch. Microstructure, microhardness wear resistance analyzed. The presence of both γ-Al2O3 α-Al2O3 throughout the coating promoted partially melted un-melted particles; howev...

The co-processing of an unconventional type of Jatropha bio-oil with petroleum distillates over mesoporous alumina-supported CoMo and NiMo sulfide catalysts (denoted CoMo/γ-Al2O3 and NiMo/γ-Al2O3) was studied. Either a stainless-steel high-pressure batch-type reactor or an up-flow fixed-bed reaction system was used under severe reaction conditions (330–350 ◦C and 5–7 MPa), similar to the condit...

Alumina is one of the most widely used ceramic materials as catalysts, catalyst supports and absorbents, and also wear resistant coating. This study focused on fabricating and characterizing of alumina ceramic nanoparticles fabricated using new and simple sol-gel method. Aluminium oxide (Al2O3) nanoparticles were synthesized by iron (III) nitrate 9-hydrate as precursor. Physicochemical properti...

a simple, selective and efficient solid phase extraction method based on the use of  γ-alumina nanoparticles coated with sodium dodecyl sulfate (sds) and modified with 2-​(5-​bromo-​2-​pyridylazo)​-​5-​(diethylamino) ​phenol (5-br-padap) as a new adsorbent was developed for the separation and preconcentration of trace amounts of manganese (ii) prior to determination by flame atomic absorption s...