Pyrolysis

About: Pyrolysis is a research topic. Over the lifetime, 34918 publications have been published within this topic receiving 833524 citations.

The pyrolysis of trimethyl gallium

Abstract: The pyrolysis of trimethyl gallium has been studied in a toluene carrier flow system from 686° K to 983° K using total pressures from 6.1 mm to 31.1 mm. The progress of the reaction was followed by...

Pyrolysis of Sawdust in a Conical Spouted Bed Reactor. Yields and Product Composition

Abstract: The performance of original equipment provided with a conical spouted bed reactor has been studied in flash pyrolysis of sawdust with an inert gas (N2) in the 350−700 °C range and with 50 ms of average gas residence time. The effect of pyrolysis temperature on the yields of gas, liquid, and char on gas and liquid composition and on char properties has been studied. The maximum yield of liquid (corresponding to 70 wt %) is obtained at 450 °C and its composition determined by GC/MS is similar to that reported in the literature for bubbling fluidized beds. Although temperatures above 600 °C are required for the development of the char porous structure, the yield of CO2 obtained under these conditions is unacceptable.

Anisole and Guaiacol Hydrodeoxygenation over Monolithic Pt–Sn Catalysts

Abstract: Direct vapor-phase upgrading of biomass pyrolysis products requires a catalytic reactor able to treat high reactant flow rates without generating a large pressure drop, because conventional pyrolys...

Hard carbon originated from polyvinyl chloride nanofibers as high-performance anode material for Na-ion battery.

Abstract: Two types of hard carbon materials were synthesized through direct pyrolysis of commercial polyvinyl chloride (PVC) particles and pyrolysis of PVC nanofibers at 600-800 °C, respectively, where the nanofibers were prepared by an electrospinning PVC precursors method. These as-prepared hard carbon samples were used as anode materials for Na-ion batteries. The hard carbon obtained from PVC nanofibers achieved a high reversible capacity of 271 mAh/g and an initial Coulombic efficiency of 69.9%, which were much superior to the one from commercial PVC, namely, a reversible capacity of 206 mAh/g and an initial Coulombic efficiency of 60.9%. In addition, the hard carbon originated from the PVC nanofibers exhibited good cycling stability and rate performance: the initial discharge capacities were 389, 228, 194, 178, 147 mAh/g at the current density of 12, 24, 60, 120, and 240 mA/g, respectively, retaining 211 mAh/g after 150 cycles. Such excellent cycle performance, high reversible capacity, and good rate capability enabled this hard carbon to be a promising candidate as anode material for Na-ion battery application.

Pore characteristics of activated carbons from the phosphoric acid chemical activation of cotton stalks

Abstract: Activated carbons were prepared by phosphoric acid activation of cotton stalks in a nitrogen atmosphere at various temperatures in the 500–800 °C range and at different H 3 PO 4 acid to cotton stalk impregnation ratios (0.3–3). In addition pyrolysis was undertaken in a thermogravimetric analyser in the presence of different ratios of phosphoric acid in order to establish the nature of the biomass to carbon transformations involved. It was established that the total activation process of H 3 PO 4 -impregnated cotton stalks occurred in four stages with the main degradation at 740 °C, compared with 330 °C for raw cotton stalks. The effects of impregnation ratio and activation temperature on the yield and adsorption capacities of activated carbon were evaluated. The chemical composition of the carbons was investigated by elemental analysis and infrared spectroscopy. The impregnation ratio and activation temperature show a strong influence on the yields and the porous texture of the resultant activated carbons. It was demonstrated that increasing impregnation ratio favours the development of mesopores especially at high activation temperature. The activated carbons showed BET surface areas ranging from 330 to 1720 m 2 g −1 , total pore volumes of 0.15–1.23 cm 3 g −1 with mesopore volumes between 0 and 0.61 cm 3 g −1 . Results suggest the practical feasibility of phosphoric acid activation of cotton stalks, which produces high quality activated carbons with high fractions of micropores and mesopores.