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The release behavior of sodium (Na) from sawdust during air and oxy-fuel combustion was investigated based on temporal detection, thermodynamics and kinetic study. The results indicated that the Na release behavior was significantly affected by the reaction temperature and combustion atmosphere. On the whole, the total release percentage of sodium in oxy-fuel environment was inferior to that in air...
UiO-66, a kind of Metal-organic framework materials (MOFs) was used as a support for nano-palladium particles (i.e., Pd-UiO-66) which was used in the catalytic hydrogenation of phenol in aqueous media in this work. The performance of Pd-UiO-66 was compared with Pd-UiO-66-NH2, in which the UiO-66 support had been modified through the introduction of NH2 groups. Pd-UiO-66 and Pd-UiO-66-NH2 were characterized...
The water vapor and trace gas impurities play important roles on CO2 capture performance using porous materials. We investigated the effects of H2O, SO2, and O2 on CO2 capture in a series of ZIFs with same SOD topology but different functional groups, such as ZIF-8, ZIF-90, ZIF-Cl, ZIF-NO2, and SALEM-2 by grand canonical Monte Carlo simulations. The results show that H2O and SO2 show a cooperative...
The paper reports the numerical investigation and experimental investigation of flue gas condensation and fine particle removal of an integrated technology (condenser, the same below) for industrial boiler. The average temperature drops to 159°C and velocity increases to 22m/s at the outlet of condenser. Furthermore, it is estimated that the mean flue gas condensation efficiency of the condenser reaches...
Removal of mercury from flue gas has been considered as one of the hot topics in both the scientific and industrial world. Adsorption of elemental mercury (Hg0) and oxidized mercury species (HgCl2, HgO, and HgS) on a novel metal organic framework (MOF) material, named Mg/DOBDC, with unsaturated metal centers was investigated using density functional theory (DFT) calculations. The results show that...
A novel solid acid was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) onto mesoporous ZrO2 coated attapulgite (MPZCA) via one-pot synthesis method. Dibenzyl ether (DBE) was used as a coal-related model compound to evaluate the catalytic activity of TFMSA/MPZCA for cleaving Calk–O bridged bonds in low-rank coals. The results show that DBE conversion over TFMSA/MPZCA could reach 100%...
Understanding the nature of CO2 adsorption in porous materials is important to developing the next generation high performance adsorbents for CO2 capture. The mechanism of CO2 adsorption in a typical metal organic framework (MOF) material, named Mg/DOBDC (DOBDC=1,4-dioxido-2,5-benzenedicarboxylate), was investigated by experiments and theoretical calculations. Needle-shaped Mg/DOBDC crystals were...
Steam explosion pretreatments was used to improve the anaerobic biodegradability of Miscanthus lutarioriparius (M. lutarioriparius). The pretreatments were carried out under five different conditions: L1 (0.5MPa 153°C 5min), L2 (1.0MPa 180°C 5min), L3 (1.5MPa 198°C 3min), L4 (1.5MPa 198°C 5min) and L5 (1.5MPa 198°C 10min). The biochemical methane potential (BMP) of raw M. lutarioriparius sample was...
The release of sodium during biomass gasification and pyrolysis in fluidized bed was systematically investigated based on an on-line measurement system. The temperature and atmosphere had strong influences on sodium release behavior. The pyrolysis atmosphere was conducive to the release of sodium than the CO2 gasification atmosphere at 900°C. The overall kinetic parameters of sodium release during...
Shaerhu subbituminous coal (SSBC) and Mengdong lignite (ML) were extracted with petroleum ether under ultrasonication at room temperature to obtain ESSBC and EML, respectively. The extracts were analyzed with a gas chromatograph/mass spectrometer and a positive-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometer to characterize biomarkers and oxygen-containing species...
The extraction residue (ER) from Xinghe lignite was subjected to ethanolysis at 300°C and the yield of ethanol-soluble portion (ESP) is 66.8wt% (daf). The ER was characterized by solid-state 13C nuclear magnetic resonance spectrometry (SS 13C NMRS) and X-ray photoelectron spectrometry (XPS), while non-basic and basic heteroatom-containing species in the ESP were analyzed by negative- and positive-ion...
Bio-energy production from lignocelluloses biomass has gained a lot of interest in recent years. Miscanthus sp. are high lignocelluloses biomass yielding with relatively high carbohydrate content cultivable on different soils and under climatic conditions. However, the lignocellulosic nature means that cellulose and hemicellulose are cover by lignin network that might limit hydrolysis. In this study,...
Xiaolongtan lignite (XL) was subjected to the mild oxidation with aqueous hydrogen peroxide–acetic anhydride (AAH) under different conditions, including temperature, the amount of AAH, and time. Each reaction mixture was separated by filtration and subsequent treatments, including extraction with ethyl acetate (EA), to afford the EA-extractable portion (EAEP), which was analyzed with a gas chromatograph/mass...
The products in the water-soluble portion from mild oxidation of Jincheng No. 15 anthracite in aqueous hydrogen peroxide were analyzed with a gas chromatograph/quadrupole time-of-flight-mass spectrometer (GC/QTOF-MS) along with theoretical calculation for the first time. A series of heteroatom(s)-containing components were identified by comparing their mass spectra with NIST11 library data. Moreover,...
A series of coal-related model compounds (CRMCs) were analyzed with an atmospheric solids analysis probe/time of flight-mass spectrometer (ASAP/TOF-MS). Pyrene, anthracene, and phenanthrene were ionized to generate stable radical molecular cation (M +• ) and protonated molecular cation ([M+H] + ). The ratio of [M+H] + to M +• is positively related to the superdelocalizability...
Shengli lignite (SL) was pretreated in H 2 O 2 aqueous solution at 40°C for 4h to obtain pretreated SL (PTSL). Both the SL and PTSL were oxidized in NaOCl aqueous solution at 30 o C for 5h to investigate the effect of pretreatment (PT) on SL oxidation with NaOCl. Gas chromatography/mass spectrometry analysis shows that the PT with H 2 O 2 significantly increased...
Structural features of Shengli lignite (SL) were investigated through ruthenium ion-catalyzed oxidation and oxidations in aqueous hydrogen peroxide (AHPO) and sodium hypochlorite (ASHC) under mild conditions. The results suggest that SL is rich in condensed aromatic species and hydroxyl-, methoxy-, and/or methyl-substituted benzene rings, and –CH 2 CH 2 – is a dominant bridged linkage...
Capturing CO 2 from the flue gases for sequestration is currently a key issue in environmental protection. Metal–organic frameworks (MOFs) are a new class of porous materials and have shown great promise for CO 2 adsorption and separation applications. While the linkers of MOFs influence the CO 2 adsorption performance greatly, the mechanism about it is still not clear. In...
The emission of mercury by coal-fired power plants has become a recent concern on the part of the electric utility industry. Knowledge of mercury kinetic mechanisms is imperative for the research of predicting mercury transformation and finding its effective control methods in coal combustion flue gas. Near the end of the flue gas path, mercury exists as a combination of elemental vapor and HgCl ...
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