a series of x(co, mn)/tio2 catalysts (x=2–12wt.%) containing 25%co and 75%mn were prepared by the co-impregnation method. all prepared catalysts have been tested in fischer-tropsch synthesis for production of c2-c4 olefins. it was found that the catalyst containing 8wt.%(co,mn)/tio2 is an optimal catalyst for production of c2-c4 olefins. the effect of operation conditions such as the h2/co mola...

Abstract Green utilization of crude oil has become an important way for energy transformation in the petrochemical industry. Crude to aimed low-carbon (C 2 -C 4 ) olefins had been conducted by micro pyrolysis-gas chromatograph/mass spectrometer (Py-GC/MS) and a small-scale fluidized-bed reactor. Fe-modified Al O 3 /USY catalysts were used catalytic pyrolysis oil. The results showed that product...

Generally, oxy-trifluoromethylation in olefins is achieved using oxidants and transition metal catalysts. However, labile olefins remain unexplored due to their incompatibility with harsh reaction conditions. Here, unprecedented light-induced oxidant and metal-free tandem radical cyclization–trifluoromethylation and dehydrogenative oxygenation of 1,6-enynes have been achieved using a photoredox...

Iron-catalyzed alkylation of internal olefins, that is, α-oxo ketene dithioacetals, was successfully realized by using styrenes as the alkylating reagents. Highly functionalized tetrasubstituted olefins were prepared in moderate to high yields.

An efficient cyclopropanation of olefins with Zn(CH2I)2, a catalytic amount of CCl3CO2H, and 1,2-dimethoxyethane at room temperature is described. A wide variety of olefins, including acid-sensitive substrates, can be cyclopropanated in 71-99% yield.

Highly enantioselective and good to high-yielding aziridination of conjugated and non-conjugated terminal olefins and cyclic olefins was achieved using a newly designed Ru(CO)(salen) complex as the catalyst in the presence of SESN(3) under mild conditions.

•Cr2O3(SG)/H-SAPO-34 shows a C2=?C4= selectivity of 95.7% in CO2 hydrogenation •Ethene accounts for more than 74% light olefins with an E/P ratio reaching 3.1 •Ethanol is formed through the reaction H3CO? and H? on Cr2O3(SG) converted into ethene SAPO-34 leads to high Conversion effective strategy sustainable utilization fossil energy biomass. However, highly selective production specific olefi...

Abstract Conventional hydrofunctionalization of ?-olefins with mineral acids proceeds Markovnikov selectivity to afford branched isomers. The direct formation linear constitutional isomers is challenging, yet anti-Markovnikov addition would be valuable for the synthesis commodity chemicals, such as primary alcohols, which are currently only accessible via stoichiometric redox reactions, a full ...