Shuyong Shang

Ni-Co/Mg-Al catalyst derived from hydrotalcite-like compound prepared by plasma for dry reforming of methane

Abstract Ni-Co bimetallic catalysts with different Ni/Co content were derived from cold plasma jet decomposition and reduction of hydrotalcite-like compounds containing Ni, Co, Mg and Al, and their catalytic performance was investigated with dry reforming of methane. Experimental results showed that the hydrotalcite-like precursors could be completely decomposed and partly reduced by cold plasma jet, and the Ni-contained catalysts exhibited much higher activity than the catalyst without Ni. Especially, the catalyst with Ni/Co ratio of 8/2 achieved not only the highest conversions of 80.3% and 69.3% for CH 4 and CO 2 , respectively, but also the best stability in 100 h testing. The catalysts were characterized by XRD, XPS, TEM and N 2 adsorption techniques, and the results showed that the better performance of the 8Ni2Co bimetallic catalyst was attributed to its higher metal dispersion, smaller metal particle size, as well as the interaction effect between Ni and Co, which were brought by the special catalyst preparation method.

Carbon dioxide reforming of methane to synthesis gas by an atmospheric pressure plasma jet

Abstract An experimental investigation on CO2 reforming of CH4 to synthesis gas was performed using a novel atmospheric pressure plasma jet, which is initiated by an alternating current of 50 Hz and a high ratio transformer. The plasma jet proved to be a stable and uniform atmospheric pressure discharge that held the advantages of both thermal and nonthermal plasma. The effects of discharge distance, CH4:CO2 mol ratio in the feed, feed flow rate, and discharge power on the reforming reaction were investigated. The results showed that the products of the reforming reaction are simple, including H2, CO, a small amount of H2O, and carbon powder. The optimal discharge distance between two electrodes is 9 mm, and the optimal CH4:CO2 mol ratio is 4:6. When the flow rate is 1000 mL/min and the discharge power is 88.4 W, the conversions of CH4 and CO2 are 94.99% and 87.23%, respectively, which are higher than those via other plasmas. The conversions of CH4 and CO2 increase with increasing the discharge power and decrease with increasing the flow rate. Current process is more advantageous in treatment capacity and conversion ability for carbon dioxide reforming of methane than other plasma systems.

Ni/MgO catalyst prepared using atmospheric high-frequency discharge plasma for CO2 reforming of methane

Abstract A new type of Ni/MgO catalyst was prepared using atmospheric high-frequency discharge cold plasma. The influences of conventional method, plasma method, and plasma plus calcination method on the catalytic activity were studied and the CO 2 reforming of methane was chosen as the probe reaction. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy, and CO 2 temperature-programmed surface reaction techniques. The results suggested that the nickel-based catalyst prepared by plasma plus calcination method possessed a smaller particle size and a higher dispersion of active component, better low-temperature activity and enhanced anti-coking ability. The conversion of CO 2 and CH 4 was 90.70% and 89.37%, respectively, and the reaction lasted for 36 h without obvious deactivation under 101.325 kPa and 750 °C with CO 2 /CH 4 = 1/1.

Preparation of trichlorosilane from hydrogenation of silicon tetrachloride in thermal plasma

A new method of producing trichlorosilane by hydrogenation of silicon tetrachloride with assistance of DC charged thermo-plasma was proposed. We have studied the dependence of degree of disassociation and ionization of hydrogen on temperature, as well as the function of heat capacity, via which the optimal volume and H2: SiCl4 molar ratio were confirmed. A DC power of 50 kW was equipped and the highest yield of trichlorosilane was above 70%, with an average yield about 60% and minimum unit energy expenditure about 3.2 kWh/kg for SiHCl3. This process is possible to be industrialized.

Research of Hydrogen Preparation with Catalytic Steam-Carbon Reaction Driven by Photo-Thermochemistry Process

An experiment of hydrogen preparation from steam-carbon reaction catalyzed by K2CO3 was carried out at 700°C, which was driven by the solar reaction system simulated with Xenon lamp. It can be found that the rate of reaction with catalyst is 10 times more than that without catalyst. However, for the catalytic reaction, there is no obvious change for the rate of hydrogen generation with catalyst content range from 10% to 20%. Besides, the conversion efficiency of solar energy to chemical energy is more than 13.1% over that by photovoltaic-electrolysis route. An analysis to the mechanism of catalytic steam-carbon reaction with K2CO3 is given, and an explanation to the nonbalanced [H2]/[CO