two-component reaction of 2-aminobenzophenones with acetylenic esters in the presence of γ-al2o3 and cu/zno as suitable heterogeneous catalysts has been studied. nano γ-al2o3 and cu/zno showed high activities when used as surface catalysts for the synthesis of quinoline derivatives. after completion of the reaction, the catalyst was recovered and reused several times under the same reaction con...

The high-temperature oxidation of Hf-modified NiAl alloy at 950 °C results in the formation γ-Al2O3 and θ-Al2O3. Exclusive HfO2 particles is observed adherent γ-Al2O3/NiAl interface. By contrast, θ-Al2O3/NiAl interface multi-layered oxide growth consisting alternate thin thick layers θ-Al2O3 NiAl2O4 along with dispersed layers. This difference elucidated by first-principle calculations showing ...

The present work reports the effects of γ-, θ-phase alumina on hydrothermal stability and properties non- strongly-interacting Rh species Rh/Al2O3 catalysts. Comparing to γ-Al2O3, θ-Al2O3 can not only reduce amount occluded but also better stabilize during aging treatment. When time was prolonged 70 h, all non-interacting transformed into Rh. XPS results indicated that might exist in form Rh/Rh...

Catalytic hydrotreating of algae bio-crude oil from hydrothermal liquefaction (HTL) Nannochloropsis sp. was performed. Different Ni-based catalysts, including Ni/γ-Al2O3, Ni-Cu/γ-Al2O3, Ni-Re/γ-Al2O3, and Ni-Cu-Re/γ-Al2O3, (10%Ni, 5%Cu, 2.5%Re) were used in upgrading the oil. Most catalytic systems could effectively eliminate S decrease N O contents, enhance more than 20% improvement higher hea...

The kinetics of changes in the concentration toxic components under γ-irradiation industrial wastewater from an oil refinery presence nano-γ-Al2O3 has been studied. phenols, surfactants, COD and total content products at various adsorbed dose were monitored. UV - spectrometric studies irradiated samples range 200-400 nm shows, that increasing absorbed leads to a decrease absorption (Abs) region...

High temperature/pressure in situ Attenuated Total Reflection Infrared (ATR-IR) spectroscopy was used to investigate the phase transformation of support γ-Al2O3 into boehmite (AlO(OH)) under the hydrothermal conditions of aqueous phase reforming (APR). Activation energy barriers of boehmite formation in hot compressed water at temperatures between 150 and 180 °C were calculated to be 15.9 ± 4.8...

The possibilities offered by catalytic γ-Al2O3 substrates are explored, and the mechanism governing graphene formation thereon is elucidated using both numerical simulations and experiments. The growth scheme offers metal-free synthesis at low temperature, grain-size customization, large-area uniformity of electrical properties, single-step preparation of graphene/dielectric structures, and rea...