(726c) Synthesis of Mixed Alcohols From Biomass Using Slurried Nano-Sized Metal Particles
AIChE Annual Meeting
Thursday, November 7, 2013 - 4:05pm to 4:30pm
Molybdenum disulfide (MoS2), anchored on a support, is a catalyst of choice to synthesize mixed alcohols, also known as Higher Alcohols Synthesis (HAS) process. However, the process suffers from low space-time-yield (STY) and poor selectivity under high temperature (300o – 325oC) / high pressure (10-20 MPa) operation that makes it unattractive for any commercial application. We are investigating the use of nano-sized MoS2, to enhance catalyst activity and increase selectivity to alcohols under less severe operating conditions.
The nanocatalysts were synthesized from a slurry of molybdenum hexacarbonyl (Mo(CO)6) and elemental sulfur (S) in hexadecane solvent at 70oC using sonication. The decomposition of Mo(CO)6 was monitored that yielded a first-order rate constant of 3 x 10-4 min-1 with an R value of .997. The TEM, SEM, IR, and Raman techniques were used to characterize MoS2 nanoparticles. The TEM data showed the mean particle size to be 5 nm. A mini-pilot unit, fitted with a 1- liter slurry reactor, has been set up to evaluate syngas conversion catalysts. Work is underway to evaluate nano MoS2 slurried in a high molecular weight solvent for conversion of premixed H2/CO in a 2:1 ratio to mixed alcohols.