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Adsorption of Carbon Dioxide on Activated Carbon

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Journal of Natural Gas Chemistry 2006年第3期15卷 223-229页

作者： Bo Guo liping chang Kechang Xie Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan 030024 China College of Environmental Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

The adsorption of CO2 on a raw activated carbon A and three modified activated carbon samples B, C, and D at temperatures ranging from 303 to 333 K and the thermodynamics of adsorption have been investigated using a vacuum adsorption apparatus in order to obtain more information about the effect of CO2 on removal of organic sulfur-containing compounds in industrial gases. The active ingredients impregnated in the carbon samples show significant influence on the adsorption for CO2 and its volumes adsorbed on modified carbon samples B, C, and D are all larger than that on the raw carbon sample A. On the other hand, the physical parameters such as surface area, pore volume, and micropore volume of carbon samples show no influence on the adsorbed amount of CO2. The Dubinin-Radushkevich （D-R） equation was the best model for fitting the adsorption data on carbon samples A and B, while the Freundlich equation was the best fit for the adsorption on carbon samples C and D. The isosteric heats of adsorption on carbon samples A, B, C, and D derived from the adsorption isotherms using the Clapeyron equation decreased slightly increasing surface loading. The heat of adsorption lay between 10.5 and 28.4 kJ/mol, with the carbon sample D having the highest value at all surface coverages that were studied. The observed entropy change associated with the adsorption for the carbon samples A, B, and C （above the surface coverage of 7 ml/g） was lower than the theoretical value for mobile adsorption. However, it was higher than the theoretical value for mobile adsorption but lower than the theoretical value for localized adsorption for carbon sample D.

关键词： carbon dioxide adsorption heat of adsorption activated carbon

Desulfurization kinetics of ZnO sorbent loaded on semi-coke support for hot coal gas

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Journal of Natural Gas Chemistry 2012年第5期21卷 556-562页

作者： Zhiwei Ma Xianrong Zheng liping chang Ruiyuan He Weiren Bao Key Laboratory of Coal Science and Technology Taiyuan University of TechnologyMinistry of Education and Shanxi ProvinceTaiyuan 030024ShanxiChina

Zn-based sorbent （Z20SC） prepared through semi-coke support in 20 wt% zinc nitrate solution by high-pressure impregnation presents an excellent desulfurization capacity in hot coal gas,in which H2 S can not be nearly detected in the outlet gas before 20 h breakthrough *** effects of the main operational conditions and the particle size of Z20SC sorbent on its desulfurization performances sorbent were investigated in a fixed-bed reactor and the desulfurization kinetics of Z20SC sorbent removing H2 S from hot coal gas was calculated based on experimental *** showed that the conversion of Z20SC sorbent desulfurization reaction increased with the decrease of the particle size of the sorbent and the increases of gas volumetric flow rate,reaction temperature and H 2 S content in inlet gas.Z20SC sorbent obtained from hydrothermal synthesis by high-pressure impregnation possessed much larger surface area and pore volume than semi-coke support,and they were significantly reduced after the desulfurization *** equivalent grain model was reasonably used to analyze experimental data,in which k s=4.382×10-3 exp（-8.270×103/RgT） and Dep=1.262×10-4exp（1.522×104/RgT）.It suggests that the desulfurization reaction of the Z20SC sorbent is mainly controlled by the chemical reaction in the initial stage and later by the diffusion through the reacted sorbent layer.

关键词： desulfurization kinetics Zn-based sorbent hot coal gas medium-temperature desulfurization

Pd/activated carbon sorbents for mid-temperature capture of mercury from coal-derived fuel gas

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Journal of Environmental Sciences 2014年第7期26卷 1497-1504页

作者： Dekui Li Jieru Han Lina Han Jiancheng Wang liping chang Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi Province Taiyuan University of Technology College of Materials Science and Engineering Taiyuan University of Technology

Higher concentrations of Hg can be emitted from coal pyrolysis or gasification than from coal combustion, especially elemental Hg. Highly efficient Hg removal technology from coal-derived fuel gas is thus of great importance. Based on the very excellent Hg removal ability of Pd and the high adsorption abilities of activated carbon（AC） for H2 S and Hg, a series of Pd/AC sorbents was prepared by using pore volume impregnation, and their performance in capturing Hg and H2 S from coal-derived fuel gas was investigated using a laboratory-scale fixed-bed reactor. The effects of loading amount, reaction temperature and reaction atmosphere on Hg removal from coal-derived fuel gas were studied. The sorbents were characterized by N2 adsorption, X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS）. The results indicated that the efficiency of Hg removal increased with the increasing of Pd loading amount, but the effective utilization rate of the active component Pd decreased significantly at the same time. High temperature had a negative influence on the Hg removal. The efficiency of Hg removal in the N2-H2S-H2-CO-Hg atmosphere（simulated coal gas） was higher than that in N2-H2S-Hg and N2-Hg atmospheres, which showed that H2 and CO, with their reducing capacity, could benefit promote the removal of Hg. The XPS results suggested that there were two different ways of capturing Hg over sorbents in N2-H2S-Hg and N2-Hg atmospheres.

关键词： Coal-derived fuel gas Hg removal Pd/AC sorbents H2S removal

Speciation and thermal transformation of sulfur forms in high-sulfur coal and its utilization in coal-blending coking process:A review

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Chinese Journal of Chemical Engineering 2021年第7期34卷 70-82页

作者： Yanfeng Shen Yongfeng Hu Meijun Wang Weiren Bao liping chang Kechang Xie State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024China Canadian Light Source 44 Innovation BoulevardSaskatoonSK S7N 2V3Canada

The utilization of high-sulfur coal is becoming more urgent due to the excessive utilization of low-sulfur,high-quality coal resources,and sulfur removal from high-sulfur coal is the most important *** paper reviews the speciation,forms and distribution of sulfur in coal,the sulfur removal from raw coal,the thermal transformation of sulfur during coal pyrolysis,and the sulfur regulation during coal-blending coking of high organic-sulfur *** was suggested that the proper characterization of sulfur in coal cannot be obtained only by either chemical method or instrumental characterization,which raises the need of a combination of current or newly adopted characterization *** from the removal of inorganic sulfur from coal,the organic sulfur can only be partly removed by chemical technologies;and the coal structure and property,particularly high-sulfur coking coals which have caking ability,may be altered and affected by the pretreatment *** on the interactions among the sulfur radicals,sulfur-containing and hydrogen-containing fragments during coal pyrolysis and the reactions with minerals or nascent char,regulating the sulfur transformation behavior in the process of thermal conversion is the most effective way to utilize high organic-sulfur coals in the coke-making *** in-situ regulation approach of sulfur transformation during coal-blending coking has been *** is,the high volatile coals with an appropriate releasing temperature range of CH4 overlapping well with that of H2 S from high organic-sulfur coals is blended with high organic-sulfur coals,and the C–S/C–C bonds in some sulfur forms are catalytically broken and immediately hydrogenated by the hydrogencontaining radicals generated from high volatile ***,the effect of mass transfer on sulfur regulation during the coking process should be considered for the larger-scale coking tests through optimizing the ratios of different coals in the coal blend

关键词： High-sulfur coal Sulfur forms Coal blend Pyrolysis Coking Mass transfer

Assessment of High-standard Farmland Construction Effectiveness in Liaoning Province During 2011–2015

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Chinese Geographical Science 2019年第4期29卷 667-678页

作者： PU Luoman ZHANG Shuwen YANG Jiuchun YAN Fengqin chang liping College of Earth Science Jilin University Changchun 130061 China Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130102 China Center for Spatial Analysis Department of Microbiology and Plant Biology University of Oklahoma Norman 73019 USA

At present, the large-scale construction of high-standard farmland in China has improved the quality of cropland and crop production and enhanced the eco-environmental security. To obtain a comprehensive understanding of high-standard farmland construction in Liaoning Province of China during the 12 th five-year period(2011–2015), through on-the-spot investigations and remote sensing monitoring, this study assessed the construction effectiveness of ten typical sampling projects in Liaoning Province and then presented practical suggestions. The main conclusions were as follows. 1) The ranges of increase in productivity of the ten sampling projects in Liaoning Province all surpassed the goal of 1500 kg/ha. 2) Among all sampling project areas, the levels of productivity stability of nine sampling projects were higher than that of the surrounding farmland in a severe drought year. However, the productivity stability of the high-standard farmland construction project in Faku County, Yiniupu Town, declined by 1.04% compared with the surrounding farmland. 3) Except for the high-standard farmland construction project in Dengta City, Dengta Irrigation Region, the productivity uniformity of the other nine sampling projects increased by 3.30%–88.10%. 4) Eight of the ten sampling projects belonged to Class 1, and two projects belonged to Class 2, showing that the effectiveness of high-standard farmland construction in Liaoning Province was quite *** were some suggestions for high-standard farmland construction in the future. All departments should strengthen cooperation and formulate corresponding protection and development strategies suitable for local conditions. Additionally, lasting management mechanisms should also be established. Using remote sensing monitoring to assess the high-standard farmland construction effectiveness during the 12 th five-year period could provide experience and decision-making support for high-standard farmland construction in the future.

关键词： high-standard farmland remote sensing monitoring productivity stability productivity uniformity Liaoning Province,China

A review on research and development of iron-based sorbents for removal of hydrogen sulfide from hot coal gases

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 529-535页

作者： Jianglong YU liping chang Fan LI Kechang XIE Key Laboratory of Coal-Based Fuels for Aviation Shenyang Aerospace UniversityShenyang 110136China Key Laboratory of Coal Science and Technology(Ministry of Education and Shanxi Province) Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering University of Science and Technology LiaoningAnshan 114051China

In poly-generation and integrated gasificationcombined cycle(IGCC)systems for clean energy conversion,it is essential to remove impurities such as sulfur species from hot coal gases prior to entering the subsequent *** paper provides a comprehensive review on previous studies on high temperature removal of hydrogen sulfide from high temperature coal gases using iron-based sorbents.A two-step desulphurization process for hot coal gas cleanup is highlighted,which is integrated with direct production of elemental sulfur during regeneration of ironbased sorbents in the primary desulphurization *** kinetic modeling approaches for sulfidation and regeneration were *** research on activated carbon supported sorbents was also briefly summarized.

关键词： hot coal gas cleanup iron-based sorbents sulfidation regeneration sulphur recovery

A MODIS Time Series Data Based Algorithm for Mapping Forest Fire Burned Area

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Chinese Geographical Science 2013年第3期23卷 344-352页

作者： YANG Wei ZHANG Shuwen TANG Junmei BU Kun YANG Jiuchun chang liping Northeast Institute of Geography and Agroecology Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Geography and Environmental Systems University of Maryland Baltimore County

Burned area mapping is an essential step in the forest fire research to investigate the relationship between forest fire and cli- mate change and the effect of forest fire on carbon budgets. This study proposed an algorithm to map forest fire burned area using the Moderate-Resolution Imaging Spectroradiameter （MODIS） time series data in Heilongjiang Province, China. The algorithm is divided into two steps： Firstly, the ＇core＇ pixels were extracted to represent the most possible burned pixels based on the comparison of the tem- poral change of Global Environmental Monitoring Index （GEMI）, Burned Area Index （BAI） and MODIS active fire products between pre- and post-fires. Secondly, a 15-km distance was set to extract the entire burned areas near the ＇core＇ pixels as more relaxed conditions were used to identify the fire pixels for reducing the omission error as much as possible. The algorithm comprehensively considered the thermal characteristics and the spectral change between pre- and post-fires, which are represented by the MODIS fire products and the spectral index, respectively. Tahe, Mohe and Huma counties of Heilongjiang Province, China were chosen as the study area for burned area mapping and a time series of burned maps were produced from 2000 to 2011. The results show that the algorithm can extract burned areas more accurately with the hiehest accuracy of 96.61%.

关键词： Burned area mapping Moderate Resolution Imaging Spectroradiameter (MODIS) Global Environmental Monitoring Index(GEMI) Burned Area Index (BAI)

Gully Erosion Regionalization of Black Soil Area in Northeastern China

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Chinese Geographical Science 2017年第1期27卷 78-87页

作者： YANG Jiuchun ZHANG Shuwen chang liping LI Fei LI Tianqi GAO Yan Northeast Institute of Geography and Agroecology Chinese Academy of Sciences College of Earth Science Jilin University College of Environment and Planning Henan University Songliao River Basin Water Conservancy Committee Ministry of Water Resources

Gully erosion is the frequent and main form of soil erosion in the black soil area of the northeastern China, which is one of the most important commodity grain production bases in China. It is encroaching upon the fertile farmland there. Regionalization of gully erosion can reveal the spatial distribution and regularity of the development of gully erosion. Based on the eco-geographical regional background features of the black soil area, this study combined the regionalization with influencing factors of the development of gully erosion. GIS spatial analysis, geostatistical analysis, spatial statistics, reclassification, debris polygon processing and map algebra methods were employed. As a result, the black soil area was divided into 12 subregions. The field survey data on type, length, volume and other characteristics indicators of gully erosion were used to calibrate the results. Then the features of every subregion, such as where the gully erosion is, how serious it is, and why it happens and develops, were expounded. The result is not only an essential prerequisite for gully erosion surveys and monitoring, but also an important basis for gully erosion prevention.

关键词： regionalization gully erosion soil and water conservation black soil area northeastern China

High Resolution Land Cover Datasets Integration and Application Based on Landsat and GlobCover Data from 1975 to 2010 in Siberia

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Chinese Geographical Science 2016年第4期26卷 429-438页

作者： LIU Tingxiang ZHANG Shuwen XU Xinliang BU Kun NING Jia chang liping Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

Land cover is recognized as one of the fundamental terrestrial datasets required in land system change and other ecosystem related researches across the globe. The regional differentiation and spatial-temporal variation of land cover has significant impact on regional natural environment and socio-economic sustainable development. Under this context, we reconstructed the history land cover data in Siberia to provide a comparable datasets to the land cover datasets in China and abroad. In this paper, the European Space Agency(ESA) Global Land Cover Map(GlobCover), Landsat Thematic Mapper(TM), Enhanced Thematic Mapper(ETM), Multispectral Scanner(MSS) images, Google Earth images and other additional data were used to produce the land cover datasets in 1975 and 2010 in Siberia. Data evaluation show that the total user′s accuracy of land cover data in 2010 was 86.96%, which was higher than ESA GlobCover data in Siberia. The analysis on the land cover changes found that there were no big land cover changes in Siberia from 1975 to 2010 with only a few conversions between different natural forest types. The mainly changes are the conversion from deciduous needleleaf forest to deciduous broadleaf forest, deciduous needleleaf forest to mixed forest, savannas to deciduous needleleaf forest etc., indicating that the dominant driving factor of land cover changes in Siberia was natural element rather than human activities at some extent, which was very different from China. However, our purpose was not just to produce the land cover datasets at two time period or explore the driving factors of land cover changes in Siberia, we also paid attention on the significance and application of the datasets in various fields such as global climate change, geopolitics, cross-border cooperation and so on.

关键词： land cover change Landsat data integration data application Siberia