Xinqian Shu

Combustible gas production during catalytic pyrolysis of municipal solid waste

ABSTRACT Catalytic pyrolysis tests of municipal solid waste were carried out in a fixed bed reactor to produce combustible gases in this study. The influence of additives including CaCO3 and SiO2 with various amounts on the combustible gas productions was studied. The result shows that the catalytic effect of CaCO3 is better than that of SiO2. In addition, the pyrolysis of municipal solid waste was tested with the addition of CaO which was the thermal decomposition product of CaCO3. The catalysis of CaO mainly manifested in two aspects: catalyst CaO promoted the evolution of secondary cracking reaction and the reduction reaction between CO2 and C.

Co-pyrolysis characteristics and product distributions of municipal solid waste and corn stalk

ABSTRACT To investigate synergetic effects on pyrolysis of municipal solid waste and corn stalk, pyrolysis characteristics and product distributions of their mixtures were examined by thermal gravimetric and fixed-bed. Results indicated that co-pyrolysis process can be divided into four steps: losing water, main pyrolysis, carbonization and catalytic gasification of char. Under different blending ratio conditions, char and liquid yields were lower than the theoretical values calculated on pyrolysis of each individual sample, and consequently, gas yields were higher. Linear relationship can be applied to char and liquid products, however, hardly applied to gas yields.

Effect of high concentration SO2 on four-way catalytic performance of La0.9Sr0.1Pd0.03Mn0.97O3 perovskite catalysts

The influence mechanism of SO2 on the NOx removal performance of a La0.9Sr0.1Mn0.97Pd0.03O3 catalyst was investigated in this paper using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and the transient response method. Results show that incorporating the noble metal Pd into the catalyst increases the specific surface area of the original catalyst, creating a suitable place for NOx contact, reducing the ignition temperature of soot and improving the NOx, C3H6 and CO conversion of the catalyst effectively. Although the catalyst La0.9Sr0.1Mn0.97Pd0.03O3 forms a stable and irreversible sulphate after reacting in a high concentration of SO2 (300 ppm) atmosphere, it retains a high removal efficiency of NOx.

Pyrolysis of pressure-sensitive adhesive wastes in a fixed-bed reactor

ABSTRACT Pyrolysis of pressure-sensitive adhesive (PSA) wastes have been investigated in a fixed-bed reactor with a heating rate of 20°C/min. PSA pyrolysis mainly occurs between 300 and 600°C. The maximum liquid yield was obtained at 550°C with a yield of 55.69%. Liquid product can be used as fuel or raw material for purifying 2-ethyl-1-hexanol, dehydroabietic acid, 2,4-dimethyl-1-heptene, and styrene. The main composition in gas is CO and CO2, followed by CH4 and H2. High content of ash in char limits the application in fuel, but might be used as an adsorption material after upgrading.