Kinetics of Heterogeneous Catalytic Gas-Phase Oxidation of 3-Picoline in a Microwave Heated Reactor
243rd ACS National Meeting & Exposition
25-29 Mar 2012
||Abstracts of Papers, 243rd ACS National Meeting & Exposition, San Diego, CA, United States, March 25-29, 2012
American Chemical Society. Washington, D. C.2012.
ACS National Meeting Book of Abstracts
Boreskov Institute of Catalysis SB RAS
Reaction kinetics of microwave assisted heterogeneous gas-phase synthesis of nicotinic acid by oxidn. of 3- picoline in the presence of oxygen, nitrogen, and water vapors over vanadium-titanium oxide catalysts, binary and doped with molybdenum, was investigated and compared with the kinetics of this reaction performed by traditional conventional heating. It was obsd. that by microwave heating low ratio of oxygen to 3-picoline concns. is needed to keep activity of the catalyst and selectivity for nicotinic acid on a high level, while low oxygen concn. affected the catalyst activity by conventional heating. It is a very important feature considering that air with the fixed oxygen concn. is used as an oxidizing agent and microwave energy application could increase the catalyst capacity by using higher concns. of 3-picoline. Microwave assisted reaction kinetics strongly depends on the catalyst nanostructure. The higher the size of the catalyst nanoparticles as well as the pore diam., the higher the nicotinic acid selectivity. All effects obsd. in microwave assisted catalytic gas-phase oxidn. of 3-picoline are thermal and could be explained by different temp. distribution when using different energy sources.