Cracking Cyclohexane. Thermal and Catalytic Decomposition at High Pressures

Hydrodeoxygenation of 2-Methoxyphenol over Ru, Pd, and Mo2C Catalysts Supported on Carbon

“…36 Cyclopentylmethanol and cyclohexanol can form cyclopentane at high temperatures and reaction times (Table S1b,c), and these reactions also occur in noncatalytic thermal reactions. 37 Note that cyclohexanol is more reactive than methoxycyclohexane or cyclopentylmethanol at high temperatures, since the concentration of cyclohexanol increases and then decreases with reaction time (Table S1b,c), whereas the other two components with one O atom removed continue to increase with reaction time. At 330 °C, the intermediate products cyclohexanol and methoxycyclohexane are completely converted within 180 min, whereas cyclopentylmethanol is still present in the product.…”

Conversion of Hydrocarbons into Butadiene.

“…(81). High pressures are inimical toward the thermal or catalytic conversion (62). The primary reaction in thermal conversion is commonly regarded as dehydrogenation t o cyclohexene (84,88).…”

Cracking and Dehydrogenation of Cyclohexane by [(phen)M(X)]+ (M = Ni, Pd, Pt; X = H, CH3) in the Gas Phase

“…While a large percentage of naphtha consists of linear hydrocarbons, a portion is made up of cyclic hydrocarbons called naphthenes, which consist of saturated cyclic hydrocarbons like cyclohexane. The transformation of these cyclic hydrocarbons into high-commodity chemicals like hydrogen, ethylene, and propylene constitutes a large economic portion of the petroleum-refining industry Thermal cracking of cyclohexane has been studied and employed for several decades. − In essence, it can be visualized by scission of two C–C bonds of the ring structure leading to the formation of ethylene and 2-butene (eq ) or two molecules of propylene (eq 2). The cracking process requires high temperatures (>700 °C) and pressures (>70 atm), and even the use of catalysts does not afford significantly lower temperatures .…”

“…Another way to transform cyclohexane involves its dehydrogenation to benzene (eq ). This is an attractive reaction as it has a high yield of hydrogen, a commodity chemical and fuel, while also producing benzene, a chemical used much more widely than cyclohexane. Under the typical cracking conditions, this process is not favored due to the high pressure employed and the lack of a proper dehydrogenation catalyst . In the presence of, for example, Pt catalyst, cyclohexane dehydrogenation dominates .…”

“…Under the typical cracking conditions, this process is not favored due to the high pressure employed and the lack of a proper dehydrogenation catalyst. 7 In the presence of, for example, Pt catalyst, cyclohexane dehydrogenation dominates. 8 The reverse process, the hydrogenation of benzene to cyclohexane, is also often used when cyclohexane needs to be produced as a starting material for adipic acid used in turn for production of nylon.…”