Gong H.,Nanjing University |
Gong H.,Jiangsu Key Laboratory of Vehicle Emissions Control |
Chen Z.,Nanjing University |
Chen Z.,Low Carbon Technology |
And 4 more authors.
Renewable Energy | Year: 2015
The presence of siloxanes challenges the use of landfill gas (LFG) as a fuel for energy recovery, due to the formation of microcrystalline silica deposits during combustion. Activated carbon (AC) is often selected as an adsorbent for removing siloxanes from LFG. In order to find the key characteristics that affect the siloxanes adsorption capacity of AC, this paper studied the effects of AC textural structure and surface chemistry on siloxane adsorption. Anthracite AC was respectively treated by aqua ammonia, hydrochloric acid and heat to obtain modified AC with different surface properties. Adsorption capacities of the original and modified AC for octamethylcyclotetrasiloxane (D4) were measured. Results showed that most of the modified AC had a higher D4 adsorption capacity than the original AC. Several approaches were adopted to characterize the AC. The results obtained by nitrogen adsorption experiment revealed that all the employed modification methods changed the AC pore size distribution to some extent. The narrow mesopores on the AC surface are more desired for the siloxane adsorption. As for the AC surface functional groups, the results obtained by Boehm titration revealed that the alkaline and phenolic groups are favorable for siloxane adsorption, while the carboxylic groups are undesired for siloxane adsorption. © 2015 Elsevier Ltd.
He Q.,Nanjing University |
He Q.,Jiangsu Key Laboratory of Vehicle Emissions Control |
Xie D.,Nanjing University |
Xu R.,Nanjing University |
And 3 more authors.
Fuel | Year: 2015
Abstract The effects of blending sewage sludge on the properties of coal-sludge slurry (CSS), such as solid loading, apparent viscosity, rheological behaviour and stability, were systematically investigated. The size and morphology of particles, and grinding efficiency were analyzed. The experimental results showed that adding sewage sludge can improve the grinding efficiency and stability of slurry. CSSs prepared from Yanzhou coal, Jiangxinzhou sewage sludge and Yangzi sewage sludge exhibit pseudo-plastic behaviour with an apparent viscosity decreasing with increasing shear rate. Both CSSs, containing 10 wt% Jiangxinzhou sewage sludge and 15 wt% Yangzi sewage sludge, with about 60 wt% solid loading and 1200 mPa s apparent viscosity, are suitable for theirs handling in preparation, transport, storage, atomization, and combustion processes. © 2015 Elsevier Ltd.
Huan Z.-K.,Nanjing University |
Huan Z.-K.,Jiangsu Key Laboratory of Vehicle Emissions Control |
Zong E.-M.,Nanjing University |
Zong E.-M.,Jiangsu Key Laboratory of Vehicle Emissions Control |
And 8 more authors.
Huanjing Kexue/Environmental Science | Year: 2012
The synthesis of mesoporous carbons CMK-3 was implemented using SBA-15 samples as the hard templates and sucrose as the carbon source. Ordered mesoporous carbon CMK-3 supported palladium catalyst with a loading amount of 20% (Pd/CMK-3) was prepared by a complexing reduction method. XRD and TEM results showed that the p6mm hexagonal symmetric pore structures of CMK-3 were highly ordered and the Pd nanoparticles with the average size of 4.2 nm and 4.5 nm were well dispersed on CMK-3 and activated carbon (AC) surfaces respectively. Raman results revealed that CMK-3 presented higher graphitization and a higher electric conductivity than AC. The most probable pore size of CMK-3 was 4.5 nm, which is larger than that of AC(0.54 nm). The BET surface area of CMK-3 was 1114 m2·g-1, which was also larger than that of AC(871 m2·g-1). The mesoporous structure of CMK-3 was also observed. The Pd/CMK-3 catalyst exhibited more excellent initial electrocatalytic activity for formic acid oxidation than Pd/AC by cyclic voltammetry (CV). But the chronoamperometry (CA) demonstrated that the stability of the two catalysts were almost equal after 100 s polarization at 0.2 V (vs. SCE).