Catalytic pyrolysis of tobacco rob: Kinetic study and fuel gas produced

School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Bioresource Technology (Impact Factor: 4.49). 12/2011; 102(23):11027-33. DOI: 10.1016/j.biortech.2011.09.053
Source: PubMed


The pyrolysis kinetics of tobacco rob (TR) was investigated using thermogravimetric analysis (TGA) under inert atmosphere, adding chemicals (dolomite and NiO) as catalysts by catalytic-mixing method. The TGA results showed that mass loss and mass loss rates were affected by catalysts. The conversion rates increased while the activation energy decreased. Moreover, the thermal decomposition behaviors of TR were studied in the fixed-bed reactor using dolomite and NiO/γ-Al2O3 as catalysts by catalyst-bed method. A series of experiments had been performed to explore the effects of catalysts, and reaction temperature on the composition and yield of fuel gas. The experiments demonstrated that the catalysts had a high activity of cracking tar and hydrocarbons, as well as yielding a high fuel gas production. For both methods, dolomite and NiO revealed better catalytic performance as a view of enhancing conversion rates and increasing product gas yield.

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    • "Hence, its pyrolysis is very complex, including both thermal volatilization of light compounds and thermal decomposition of large compounds192021. Currently, pyrolysis of tobacco has been widely inves- tigated22232425, mainly focusing on the pyrolytic conversion or transformation of toxic substances[26,27]. In regard to the selective production of valuable chemicals from tobacco, only the recovery of nicotine has also been studied[19,28]. "
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    ABSTRACT: A new technique was proposed to selectively produce nicotyrine, a valuable alkaloidal product, from catalytic fast pyrolysis of tobacco mixed with the Pd/C catalyst. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to investigate the effects of pyrolysis temperature and catalyst-to-tobacco ratio on the selective nicotyrine production. The actual nicotyrine yields under different reaction conditions were quantitatively determined. Moreover, the catalytic activity of the Pd/C catalyst was compared with those of the activated carbon (AC), Ru/C and Pd/SBA-15 catalysts. The results indicated that during the catalytic fast pyrolysis process, the Pd/C catalyst possessed promising dehydrogenation capability to selectively convert the nicotine in tobacco into the nicotyrine, and it performed much better than the other three catalysts. The maximal nicotyrine yield reached as high as 2.80 wt%, obtained at the pyrolysis temperature of 400 °C and catalyst-to-tobacco ratio of 2.
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    • "Varhegyi et al. (2010) believed that the combustion of tobacco included a step of devolatilization and a step of burning the formed char. Yang et al. (2011) found that by using Dolomite and NiO/␥-Al 2 O 3 as catalysts, during pyrolysis, mass loss increased, pyrolysis temperature decreased, activation energy decreased, and fuel gas yield increased. Kinetic studies of thermal decomposition are essential when investigating the use of biomass for the production of energy and new materials, thus the primary goal of this work was to investigate the reaction models describing the pyrolysis process of tobacco stems and tobacco leaves (Bridgwater et al., 1999; Senneca, 2007; Tsamba et al., 2006). "
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