Conversion of Vegetable Oils into Hydrocarbons over CoMo/MCM-41 Catalysts

Abstract

Deoxygenation of triglycerides over Co and Mo sulfides supported on a series of mesoporous molecular sieves (MCM-41) with varying Si/Al ratio has been investigated in this contribution. The catalysts were tested in a flow reactor at reaction temperatures 300 and 320°C, hydrogen pressures 2-11 MPa and space velocities 1-4 h -1 using refined rapeseed oil as a feedstock. Incorporation of Al into the framework of MCM-41 led to an increase of both conversion of triglycerides and selectivity to hydrocarbons, namely n-heptadecane and n-octadecane. However, the conversion of triglycerides was lower than that achieved over alumina supported CoMo. Moreover, the rather high selectivity to oxygenated products, as compared with alumina supports, has made possible a detailed description of the reaction intermediates and their dependence on the reaction conditions.

Utilization of Triglycerides and Related Feedstocks for Production of Clean Hydrocarbon Fuels and Petrochemicals: A Review

“…Under identical reaction conditions (280-310°C) an increase in overall hydrogen pressure (from 0.7 to 7 MPa) suppressed hydrodecarboxylation of triglycerides at the expense of their hydrodeoxygenation [10,67]. On the other hand, increasing reaction temperature (from 280 to 310°C) promoted hydrodecarboxylation over hydrodeoxygenation at constant pressure (7 MPa) [10,17,18].…”

“…The activity of hydrotreating catalysts is affected by the nature of the support and its properties [57]. Several efforts to understand the role of support on the activity and selectivity metal sulfides catalysts used for deoxygenation of triglycerides were reported [67,74]. Specifically, mesoporous materials have shown great potential as catalyst supports [75,76] and have been reported to provide some advantages over conventional alumina support in hydrotreating applications [77,78].…”

“…40% for CoMo/Si-MCM-41 at 290°C, while yields over[90% were achieved when alumina-supported catalysts were used. It was suggested that this is due to the differences in interactions between the active phase and support originating from the differences in support composition [67,74]. Incorporation of Al in MCM-41 support enhanced the activity of the CoMo sulfided catalyst in comparison with Si-MCM-41-supported CoMo catalyst; however the deoxygenation activity remained lower than that of alumina supports [67].…”

Energy from Waste Materials and Unconventional Sources

“…There are many studies that have investigated the thermal conversion (pyrolysis and cracking) of triglycerides for obtaining hydrocarbon fuels (Alencar et al 1983;Ali and Hanna 1994;Dandik and Aksoy 1998;1999;Gusmao et al 1989;Kubicka et al 2010;Lima et al 2004;Maher and Bressler 2007;Schwab Simacek et al 2009). Results showed that conversions ranged between 54 and 100 % and were heavily dependent on operating variables.…”

A real support effect on the hydrodeoxygenation of methyl oleate by sulfided NiMo catalysts

“…These catalysts consist of Co-and Nipromoted MoS 2 supported on γ-alumina. HDO of vegetable oil feedstock using supported NiMo sulfides has been studied in the past [4,9,23,8,[24][25][26][27][28][29][30][31][32]. Usually, model compounds have been employed in this context [25][26][27][28]33,34].…”