Decalin ring opening over NiWS/SiO 2 -Al 2 O 3 catalysts in the presence of H 2 S

Influence of the Brønsted Acidity on the Ring Opening of Decalin for Pt-USY Catalysts.

“…At the reaction condition studied, products with more than 10 carbon atoms were not detected. According to other authors reports n-nonane retention time was used to separate the C 1 -C 9 fraction from C 10 fraction in on-line GC analysis, owing to the fact that n-nonane is the last C 9 compound to elute from the reaction mixture of decalin ring opening reaction products and to be unambiguous identified [16]. Consequently, yield to C 9− products were obtained from the chromatographic areas of the peaks with retention time (t R ) equal to or lower than n-nonane, as it is indicated in Equation (1).…”

“…However, these compounds are poor representatives of the LCO composition. To account for this limitation, two-ring probe molecules, such as decalin and tetralin, have been employed [5,13,[16][17][18][19][20][21][22][23][24][25][26][27]. However, even by starting from a single molecule (or two stereoisomers in the case of decalin), a complex mixture of ca.…”

Transition metal sulfides on zeolite catalysts for selective ring opening

“…Few investigations have been made and in this field and they often suffer from analytical problems due to the complexity of the products mixture of C10 compounds [8]. In this domain, literature describes the conversion of tetralin or decalin with conventional NiMoS or NiWS sulfide catalysts deposited on various acidic supports such as Zr doped mesoporous silica [9] , USY [10], Al2O3-USY mixture [11], silica alumina [12] or with Al2O3-USY mixtures promoted by P or Ti to modulate acidity [13].In the case silica alumina of various composition or doped with F, at 350°C, selectivity towards ring opening products remains below 15% whatever the conversion level (10-80%) [12] and for mesoporous silica at 100% conversion, tetralin leads mostly to hydrogenated compounds and cracked products (60 %). In fact, tetralin was often used as reactant but it is rapidly hydrogenated into C (cis) and T (trans) decalin which further reacts.…”

Selective ring opening of decalin over bifunctional RuS2/zeolite catalysts

“…However, their low thioresistance and the cost of noble metals are detrimental to their industrial application. Therefore, several attempts have been made for developing SRO catalysts which can accommodate the presence of a few percents H 2 S. Hydrocracking-like catalysts such as NiWS/Al 2 O 3 -USY [23] NiWS/ASA catalyst [24] and NiMoS on ASA or Y zeolite [25] have been investigated with tetralin or decalin as model molecules. However, the performances remain low and the specific properties of RuS 2 on zeolites observed in hydrogenation reactions suggest that this combination of catalytic functions might be useful for SRO reactions.…”