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国家自然科学基金(21277060)

作品数:5 被引量:28H指数:4
相关作者:李萍齐中囡辛颖张昭良李倩更多>>
相关机构:南京信息工程大学济南大学更多>>
发文基金:国家自然科学基金中国博士后科学基金更多>>
相关领域:理学环境科学与工程电气工程化学工程更多>>

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Different mechanisms between reactions of soot with gaseous and adsorbed NO_2被引量:1
2014年
The reactions of soot with gaseous and adsorbed NO2were tested over the K/MgAlO catalyst.After the reaction intermediates were identified by combination of in situ IR characterization and first-principles calculation,the different mechanisms were elucidated.It was found that the reactivity of adsorbed NO2is lower than that of the gas form.The adsorbed NO2reacts with soot in the form of nitrates,leading to the observation of two IR bands at 2,234and 2,110 cm-1,which are ascribed to the vibration frequencies of cyanates on K sites and cyanides on the MgAlO support,respectively.On the contrary,the isocyanates were confirmed as intermediates in the reaction of soot with gaseous NO2.Because the adsorbed NO2species(i.e.,nitrates)are restricted by the electrostatic field of K+,the cyanates are produced and readily cracked into cyanides,which transfer to the MgAlO support.The gaseous NO2favours the production of isocyanates due to their higher stability.The weaker reactivity of adsorbed NO2at lower temperatures can be attributed to the restriction of the electrostatic field of K+.
Yexin ZhangShaojie ChenQian LiZhaoliang ZhangJian Zhang
关键词:反应中间体气态第一原理计算异氰酸酯
Biomass-derived nanostructured porous carbons for lithium-sulfur batteries被引量:5
2016年
Biomass has been utilized as an energy source for thousands of years typically in the formof wood and charcoal.Technological advances create new methodologies to extract energy and chemicals frombiomass. The biomass-derived nanostructured porous carbons(BDNPCs) are the most promising sulfur hosts and interlayers in rechargeable lithium-sulfur(Li-S) batteries. In this article, a comprehensive review is provided in the synthesis of nanostructured porous carbon materials for high-performance rechargeable Li-S batteries by using biomass. The performances of the Li-S batteries dependent on the porous structures(micro, meso and hierarchical) from BDNPCs are discussed, which can provide an in-depth understanding and guide rational design of high-performance cathode materials by using low-cost,sustainable and natural bio-precursors. Furthermore, the current existing challenges and the future research directions for enhancing the performance of Li-S batteries by using natural biomass materials are also addressed.
Sumair Imtiaz张建Zahid Ali Zafar季胜楠黄太仲James A.Anderson张昭良黄云辉
关键词:CATHODESULFURHOSTSINTERLAYERS
Determination of 4-tert-octylphenol in surface water samples of Jinan in China by solid phase extraction coupled with GC-MS被引量:4
2013年
Octylphenols, considered as xenoestrogens, mainly exist as 4-tert-octylphenol (OP) in aquatic environments. The high stability and accumulation of OP in aquatic systems have caused endocrine disruption. The OP in surface water in Jinan, China was analyzed by gas chromatography-mass spectrometry (GC-MS) coupled with solid phase extraction (SPE). Water samples were extracted by SPE on a cartridge system containing C-18 as sorbent. To increase sensitivity and selectivity, OP was derivatized to 4-tert-octyl-phenoxy silane. With the use of phenanthrene-d10 as internal standard, the detection limit based on signal-to-noise ratio (S/N = 3) was 0.06 ng/mL. The average recovery was from 84.67% to 109.7%. The precision of the method given as the relative standard deviations (RSD) was within the range 6.24%-12.96%. In the target water samples, the concentrations of OP were as follows: 15.88-71.24 ng/L for Jinxiuchuan Reservoir, 3.850-26.68 ng/L for the city moat, 6.930-41.56 ng/L for Daming Lake, 66.03-474.2 ng/L for Xiaoqing River, 14.66-17.72 ng/L for the Yellow River, and 10.60-26.43 ng/L for Queshan Reservoir. The Xiaoqing River was seriously polluted due to the discharge of wastewater from Jinan. Jinxiuchuan Reservoir had a higher concentration of OP compared with the Yellow River and Queshan Reservoir, which is ascribed to the surrounding human activities. These data are reported for the first time, providing strong support for the control of OP pollution in Jinan.
Xueyu YangMingren LiuZhongpeng WangQian LiZhaoliang Zhang
关键词:GC-MSOCTYLPHENOLDERIVATIZATION
三维有序大孔介孔CeTiO_x复合氧化物的合成及其在超高空速下的脱硝性能
<正>氮氧化物(NOx)是造成酸雨和光化学烟雾的主要污染物。'十二五'期间,我国将对NOx排放进行总量控制,NOx治理迫在眉睫。氨选择性催化还原(NH3SCR)是目前国际上公认应用最广泛的商业化脱硝技术,催化剂是其核心。...
辛颖于明强张志亮蒋品张昭良
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Promotional effects of cerium doping and NO_x on the catalytic soot combustion over MnMgAlO hydrotalcite-based mixed oxides被引量:4
2014年
A series of MnMgA10 samples with different amounts of Ce doping were facilely prepared using coprecipitation method and their catalytic soot combustion activity was evaluated by temperature programmed oxidation reaction (TPO). The methods of X-ray diffraction (XRD), Brumauer-Emmett-Teller (BET), H2-TPR, NO-TPO and in situ 1R were used to characterize the physio- chemical properties of these samples. Dopant Ce improved the soot combustion performance of MnMgA10 catalyst due to the en- hanced redox ability. Introduction of NOx led to the further increase of catalytic soot oxidation activity on these samples. Over Ce-containing samples, the catalytic activity was slightly decreased as the amount of dopant Ce increased in 02. Diftbrently, in NO+O2, a certain amount of dopant Ce was much more favorable and excess amount of Ce resulted in a sharp drop of the catalytic soot combustion activity. Both NO: and nitrates were found to have great contributions to the effects of NOx on the soot combustion activity of Ce-doped catalysts. More NO2 was generated as dopant Ce increased. When appropriate amount of Ce was introduced, the as-formed NO2 was stored as bridging bidentate nitrate on Mn-Ce site, which was confirmed to have higher reactivity with soot than nitrite or monodentate nitrate on Mn and/or Ce sites. Overall, Mno.sMg2.sCeo.lAlo.90 was considered as the most potential catalyst for soot combustion.
李倩王晓常伟陈慧张昭良
关键词:HYDROTALCITE
非晶Ce-Ti氧化物用于NH_3选择性催化还原NO的原位红外研究被引量:14
2014年
采用原位红外光谱研究了在具有短程有序Ce–O–Ti结构的非晶Ce-Ti氧化物上NH3选择性催化还原(SCR)NOx反应.在反应条件下,催化剂表面主要被NH3吸附物种覆盖,而检测不到NOx吸附物种.经测定,NO的反应级数为0.5–0.6,表明Langmuir-Hinshelwood机理和Eley-Rideal机理同时存在.可能的机理是NH3吸附物种和弱吸附的NOx反应,生成NHyNO3(y=0–4)活性中间物种,并通过GAUSSIAN计算和原位红外结果证实了它们的存在.Ce–O–Ti结构中Ce与Ti之间表现出原子尺度的相互作用,所以在SCR反应的活性温度窗口下,催化剂的氧化还原活性提高.
李倩谷华春李萍周钰浩刘莹齐中囡辛颖张昭良
关键词:选择性催化还原原位红外
新型铁基复合氧化物催化剂的脱硝性能研究
<正>氮氧化物(NO_x)是主要的大气污染物之一,会引起酸雨、光化学烟雾、臭氧空洞以及雾霾等一系列环境问题。选择性催化还原(SCR)技术是目前最为有效且应用最广泛的氮氧化物治理技术,催化剂是SCR技术的关键。由于传统钒基...
辛颖李浩王晓李倩张昭良
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