A carboxy-directed asymmetric hydrogenation of α-alkyl-α-aryl terminal olefins was developed by using a chiral spiro iridium catalyst, providing a highly efficient approach to the compounds with a chiral benzylmethyl center. The carboxy-directed hydrogenation prohibited the isomerization of the terminal olefins, and realized the chemoselective hydrogenation of various dienes. The concise enanti...

The ethylene hydrogenation activity is compared for molybdenum oxycarbides, molybdenum carbides and a molybdenum alloy formed by reaction of molybdenum hexacarbonyl with alumina in ultrahigh vacuum using temperature-programmed desorption. It is found that molybdenum oxycarbides are inactive for ethylene hydrogenation. It is shown by forming carbides by reaction between alumina and ethylene that...

The production of fuel hydrocarbons from CO2-neutral raw materials is a promising task at present. thermal dissolution biochar obtained by the method hydrothermal carbonization sawdust was studied. in tetralin (hydrogen donor solvent) studied different temperatures (350–450 °C) and with two types dilution mixture tetralin: 1/3 1/4. process proceeded without catalyst. It found that samples subje...

Adipic acid is widely used in the production of nylon, plasticizers, polyurethane resins, adhesives, lubricants, etc. and hence compound annual growth rate adipic expected to be 4.4% with a market size over USD 7,000 million. At present commercially manufactured using petrochemical feedstock like benzene, hexane, hexene, hexanone, nitric as catalyst. The research community exploring newer metho...

Since nanoscale gold was first discovered to be catalytically active, gold-based catalysts have been studied both theoretically and experimentally in a wide range of reactions. These catalysts exhibit high activity for hydrogenation processes, in particular showing enhanced selectivity. However, there is a lack of relevant fundamental studies into these processes. Conducting hydrogenation react...

In this work structural defects were created in P25-TiO2 nanoparticles by using hydrogen DC plasma treatment in different temperatures and exposure times. X-Ray diffraction measurements show that the structure of TiO2 remains unchanged after hydrogenation. Diffuse reflectance spectroscopy measurements demonstrated band gap of TiO2 was not changed considerably by the hydrogenation. However, by a...

ethyl benzene used increasingly each year is the raw material of producing styrene monomer. this substanceis produced from benzene alkylation with ethylene or ethanol, depending on the availability and cost of rawmaterials. in this study benzene alkylation in the presence of ethanol in a catalytic fixed bed reactor inthree states of isotherm, adiabatic and non-isotherm-non-adiabatic is mathemat...

background solvents such as benzene and toluene are commonly used in tire manufacturing, and significant occupational exposure to these chemicals adversely affects the health of workers. in biological monitoring, a complementary method for personal monitoring, the internal absorbed dose is measured and individual, environmental, and exposure differences are taken into consideration. conclusions...