Abstract
Catalytic properties of physical mixture of MoP/SiO2 catalyst with SiC, γ-Al2O3, SAPO-11 and zeolite β have been compared in hydrodeoxygenation of methyl palmitate (MP). MoP/SiO2 catalyst (11.5 wt% of Mo, Mo/P = 1) was synthesized using TPR method and characterized with N2 physisorption, elemental analysis, H2-TPR, XRD and TEM. Trickle-bed reactor was used for catalytic properties investigation at hydrogen pressure of 3 MPa, and 290 °C. The conversions of MP and overall oxygen-containing compounds have been increased significantly (from 59 to about 100%) when γ-Al2O3 or zeolite materials were used instead of inert SiC. MP can be converted to palmitic acid through acid-catalyzed hydrolysis along with metal-catalyzed hydrogenolysis, and as a consequence the addition of material possessing acid sites to MoP/SiO2 catalyst could lead to acceleration of MP hydrodeoxygenation through acid-catalyzed reactions. Isomerization and cracking of alkane were observed over the physical mixture of MoP/SiO2 with zeolites, but the selectivity of MP conversion trough the HDO reaction route is remained on the high level exceeding 90%.
Highlights
In the last decade, the research efforts in the transportation fuels production from renewable sources have grown due to environmental issues and limitation of oil reserves [1,2,3,4]
The results of comparative study of these systems in the methyl palmitate HDO are presented on Figure 4, which displays the values of MP conversion (XMP ) and oxygen conversion (XO )
XO data for systems containing γ-Al2 O3, zeolite β and SAPO-11 are higher than 90%
Summary
The research efforts in the transportation fuels production from renewable sources have grown due to environmental issues and limitation of oil reserves [1,2,3,4]. Oxygen removal from triglyceride molecules includes several alternative routes [7,8,9]: hydrodeoxygenation (HDO) or decarboxylation/decarbonylation (HDeCOx ). The HDO pathway results in alkanes with the same numbers of carbon atoms in the chain and molecules of water, while. HDeCOx reactions give COx molecules and alkanes with the reduced carbon chains [7]. The HDO reaction route is more attractive in terms of atom economy, greenhouse gases production and hydrogen recycle [10,11]. The current research issue is the design of the catalysts with high activity and high selectivity towards HDO pathway
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