Higher alcohols synthesis from syngas and ethanol over KCoMoS₂–catalysts supported on graphene nanosheets

Higher Alcohol and Oxygenate Synthesis from Synthesis Gas and Ethanol over Supported K-(Co)MoS2 Catalysts: Effect of Novel Ni-Containing Carbon Nanofiber Supports Formed as Byproducts from Methane Decomposition

“…The conversion of CO (X), selectivity, selectivity of free CO 2 , and carbon chain growth factor αi were calculated according to ref 42. 42 The conversion of ethanol to other oxygenates was also carried out on a fixed-bed reactor under hydrogen atmosphere. Ethanol (30 mL) was introduced into the reactor through a high-pressure pump under the following conditions: ethanol flow rate = 0.3 mL/min, weight of the catalyst = 3, P = 2.5 MPa, T = 320 °C, GHSV = 760 L h −1 (kg cat ) −1 , and time of the reaction = 1 h. The gas and liquid products were analyzed by the same gas chromatography described in the method of syngas conversion.…”

“…The catalysts supported on CNFS show the highest stacking number and particle length, which is why they contain more active sites compared to their counterparts. 42 It is well known that hydrogenation of CO takes place on the surface of MoS 2 , and its modification with K makes it possible to produce alcohols. 69 Liu et al 70 have investigated the active phases of MoS 2 -based catalysts for hydrogenation of CO.…”

“…Transmission electron microscopes (TEM) LaB6 Tecnai G2 20F (Thermo Fisher Scientific, Waltham, MA) and TEM FEG Tecnai G2 30F were utilized to analyze the morphology of the fresh catalysts under study dispersed on a continuous micronetted carbon film by manually measuring 350–450 separate crystallites with the Fiji ImageJ software package. The average crystallite length and average stacking were estimated according to refs − . − …”

“…Alcohols as main liquid products were analyzed on a Crystal-2000 M gas chromatograph (FID detector). The conversion of CO (X), selectivity, selectivity of free CO 2 , and carbon chain growth factor αi were calculated according to ref …”

“…Catalysts supported on metal oxides (silica, alumina, magnesia, and zirconia) have a lower catalytic performance than those supported on carbon materials. − This can be clarified through the active phase-support interaction; in contrast to metal oxides, the interaction of the active phase with carbon materials is weak. Our research team has put a great deal of effort into examining how novel activated carbon supports affect the (K)­CoMoS active phase for HAS from syngas − and ethanol, , taking into our consideration the attractive characteristics of activated carbons, such as the resistance to basic and acidic condition, porosity, and extremely stability under high pressure and temperatures. In our previous publication, we noticed that the relatively short and thin layers of fiber-activated carbon-supported catalysts enhanced the number of edges and corner sites of MoS 2 -crystallites, which improves the catalytic performances, particularly HAS.…”