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国家自然科学基金(50976050)

作品数:14 被引量:227H指数:8
相关作者:沈伯雄刘亭马宏卿熊丽仙姚燕更多>>
相关机构:南开大学中国石化福建省丰泉环保控股有限公司更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划教育部“新世纪优秀人才支持计划”更多>>
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14 条 记 录,以下是 1-10
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SCR氧化燃煤烟气中气态单质汞的研究进展被引量:2
2010年
燃煤和有色金属冶炼是我国两个最大的人为汞释放源,联合选择性催化还原脱硝技术(SCR)和烟气脱硫技术(FGD)可以对烟气汞排放实施控制,是一项有潜力的燃煤电厂烟气净化技术。综述了SCR氧化燃煤烟气中气态单质汞的催化机理,总结了燃煤种类、催化剂种类和烟气组分对SCR催化氧化气态单质汞性能的影响。
邓黎丹沈伯雄刘亭朱国营
关键词:环境工程学燃煤烟气SCR
选择性催化氧化H_2S的催化剂和载体研究进展被引量:4
2010年
近年来,H2S选择性催化氧化技术作为一种新型脱硫工艺迅速发展起来,其核心技术是催化剂和载体的开发。概述了目前用于选择性催化还原H2S的各种催化剂和载体的应用现状。催化剂和载体主要包括各类金属氧化物、沸石类、活性炭及层柱黏土等。文章并对其研究成果进行总结,并对未来的研究发展方向进行了展望。
杨晓燕沈伯雄赵宁
关键词:硫化氢选择性催化氧化催化剂
纳米负载型V_2O_5-WO_3/TiO_2催化剂碱中毒及再生研究被引量:53
2010年
实验制备了陶瓷颗粒为骨架的纳米级V2O5-WO3/TiO2(C)催化剂。采用浸渍法模拟碱金属中毒,研究了中毒及再生对催化剂脱硝活性的影响,运用XRD、FT-IR、H2-TPR、XPS技术表征分析了碱金属对催化剂的失活作用。实验表明,碱金属能使催化剂活性降低,钾的毒性大于钠。FT-IR结果显示,催化剂以Lewis酸作为活性酸位。H2-TPR、XPS结果表明,钾的加入降低了催化剂的氧化能力,主要影响了催化剂表面的吸附氧。采用单纯的水洗方法并不能提高催化剂活性,而酸洗再生后催化剂在较高反应温度下活性得到较好的恢复。
沈伯雄熊丽仙刘亭王静田晓娟
关键词:选择性催化还原V2O5-WO3/TIO2催化剂中毒
Mn-CeOx/Ti-PILCs for selective catalytic reduction of NO with NH_3 at low temperature被引量:18
2012年
Titanium-pillared clays (Ti-PILCs) were obtained by different ways from TiCl4, Ti(OC3H7)4 and TiOSO4, respectively. Mn-CeOx/Ti- PILCs were then prepared and their activities of selective catalytic reduction (SCR) of NO with NH3 at low-temperature were evaluated. Mn-CeOx/Ti-PILCs were characterized by X-ray diffraction, N2 adsorption, Fourier transform infrared spectroscopy, thermal analysis, temperature-programmed desorption of ammonia and H2-temperature-programmed reduction. It was found that Ti-pillar tend to be helpful for the enlargement of surface area, pore volume, acidity and the enhancement of thermal stability for Mn-CeOx/Ti-PILCs. Mn- CeOx/Ti-PILCs catalysts were active for the SCR of NO. Among three resultant Mn-CeOx/Ti-PILCs, the catalyst from TiOSO4 showed the highest activity with 98% NO conversion at 220°C, it also exhibited good resistance to H2O and SO2 in flue gas. The catalyst from TiCl4 exhibited the lowest activity due to the unsuccessful pillaring process.
Boxiong ShenHongqing MaYan Yao
关键词:LOW-TEMPERATURESCR
A comparative study of Mn/CeO_2,Mn/ZrO_2 and Mn/Ce-ZrO_2 for low temperature selective catalytic reduction of NO with NH_3 in the presence of SO_2 and H_2O被引量:31
2013年
Ce-ZrO2 is a widely used three-way catalyst support. Because of the large surface area and excellent redox quality, Ce-ZrO2 may have potential application in selective catalytic reduction (SCR) systems. In the present work, Ce-ZrO2 was introduced into a low-temperature SCR system and CeO2 and ZrO2 supports were also introduced to make a contrastive study. Mn/CeO2, Mn/ZrO2 and Mn/Ce-ZrO2 were prepared by impregnating these supports with Mn(NO3)2 solution, and have been characterized by N2-BET, XRD, TPR, TPD, XPS, FT-IR and TG. The activity and resistance to SO2 and H2O of the catalysts were investigated. Mn/Ce-ZrO2 and Mn/CeO2 were proved to have better low-temperature activities than Mn/ZrO2, and yielded 98.6% and 96.8% NO conversion at 180℃, respectively. This is mainly because Mn/Ce-ZrO2 and Mn/CeO2 had higher dispersion of manganese oxides, better redox properties and more weakly adsorbed oxygen species than Mn/ZrO2. In addition, Mn/Ce-ZrO2 showed a good resistance to SO2 and H2O and presented 87.1% NO conversion, even under SO2 and H2O treatment for 6 hours, and the activity of Mn/Ce-ZrO2 was almost restored to its original level after cutting off the injection of SO2 and H2O. This was due to the weak water absorption and weak sulfation process on the surface of the catalyst.
Boxiong ShenXiaopeng ZhangHongqing MaYan YaoTing Liu
关键词:MANGANESE
热解终温对污泥热解残渣特性的影响被引量:17
2011年
研究了热解终温对污泥热解残渣物理化学特性的影响,着重分析了不同热解终温下污泥热解残渣的比表面积、孔结构与吸附性能,并根据傅里叶红外光谱分析污泥热解残渣表面化学性质变化。研究表明,与污泥干燥基相比,污泥热解残渣中的水分、挥发分含量较低,灰分和固定碳含量较高;热解终温为500℃时,污泥热解残渣的总比表面积达到最大值20.110 m2/g,而总孔容积则在热解终温为450℃时达到最大值28.770 mm3/g;污泥热解残渣的碘吸附值随着热解终温的升高从330.38 mg/g逐渐降低到113.00 mg/g,而亚甲基蓝吸附值在热解终温为450℃时达到最大值11.00 mg/g;碘吸附值的变化趋势与微孔结构变化不一致,而亚甲基蓝吸附值的变化趋势与中大孔结构变化规律基本相符;随着热解终温的升高,污泥热解残渣表面的C—H、—OH、C—O和C=C等官能团均发生微小变化。
沈伯雄张增辉李力黄海峰
关键词:热解终温污泥孔分布
Iron-doped Mn-Ce/TiO_2 catalyst for low temperature selective catalytic reduction of NO with NH_3被引量:64
2010年
The catalysts of iron-doped Mn-Ce/TiO2 (Fe-Mn-Ce/TiO2) prepared by sol-gel method were investigated for low temperature selective catalytic reduction (SCR) of NO with NH3. It was found that the NO conversion over Fe-Mn-Ce/TiO2 was obviously improved after iron doping compared with that over Mn-Ce/TiO2. Fe-Mn-Ce/TiO2 with the molar ratio of Fe/Ti = 0.1 exhibited the highest activity. The results showed that 96.8% NO conversion was obtained over Fe(0.1)-Mn-Ce/TiO2 at 180~C at a space velocity of 50,000 hr-1. Fe-Mn-Ce/TiO2 exhibited much higher resistance to H2O and SO2 than that of Mn-Ce/TiO2. The properties of the catalysts were characterized using X-ray diffraction (XRD), N2 adsorption, temperature programmed desorption (NH3-TPD and NOx-TPD), and X- ray photoelectron spectroscopy (XPS) techniques. BET, NH3-TPD and NOx-TPD results showed that the specific surface area and NH3 and NOx adsorption capacity of the catalysts increased with iron doping. It was known from XPS analysis that iron valence state on the surface of the catalysts were in Fe^3+ state. The doping of iron enhanced the dispersion and oxidation state of Mn and Ce on the surface of the catalysts. The oxygen concentrations on the surface of the catalysts were found to increase after iron doping. Fe-Mn-Ce/TiO2 represented a promising catalyst for low temperature SCR of NO with NH3 in the presence of H20 and SO2.
Boxiong Shen ,Ting Liu,Ning Zhao,Xiaoyan Yang,Lidan Deng College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China.
关键词:H2OSO2
基于双组分模型的棉秆催化热解动力学方法研究被引量:2
2011年
基于双组分模型,分别利用改良Coats-Redfern积分法和Vachuska-Voboril微分法分析了棉秆催化热解的失重动力学。研究表明:棉秆催化热解过程均由失水区、活化热解区(APS)和消极热解区(PPS)构成,纯棉秆热解时的PPS不明显。改良Coats-Redfern积分法和Vachuska-Voboril微分法均适用于基于双组分模型的棉秆催化热解动力学分析,但改良Coats-Redfern积分法的拟合结果更接近于实验数据。催化剂的加入显著促进了PPS组分的热解,在所选用催化剂中,MCM-41催化活性最高。
沈伯雄曹新新
关键词:催化热解动力学积分法微分法
新型壳聚糖衍生物吸附剂对Ni^(2+)的吸附行为被引量:8
2011年
利用Ni2+印迹法,通过交联和胺化反应自制新型多胺化球形Ni2+模板交联壳聚糖吸附剂(P-C-CTS(Ni)),研究吸附剂对Ni2+的吸附行为,通过模型拟合和吸附动力学对吸附过程和方式进行讨论.通过扫描电镜表征,P-C-CTS(Ni)呈球体,内部具多孔结构.室温下对不同浓度Ni2+溶液进行吸附研究,吸附数据与Freundlich模型和BET模型拟合较好,证明该吸附剂呈多孔结构,吸附性能好,吸附过程为多层分子吸附.吸附动力学研究表明该吸附剂在不同温度下对Ni2+吸附过程均包括3个阶段,即外表面扩散吸附、内表面扩散吸附和平衡吸附.30℃条件下,吸附数据对二级扩散方程拟合较好,二级速率常数k为8.119×10-3 g/(mg.min),说明该吸附剂对Ni2+吸附机理以化学吸附为主,受化学吸附控制.
唐雪娇杨丽吴丰鹏高敏沈伯雄
关键词:吸附动力学
不锈钢基底上TiO_2涂层的制备研究
2011年
针对TiO_2催化剂在不锈钢基底负载不牢固、易于脱落的问题,采用自制的无机磷酸铝盐粘结剂,利用浸渍提拉法制备了TiO_2涂层,考察了粘结剂P/Al、粘结剂添加量、煅烧温度、煅烧气氛及不锈钢基底预热处理对涂层牢固性的影响.结果表明,P/Al摩尔比为3,粘结剂添加量为5%,在300℃下煅烧60 min制得的TiO_2脱落率为9.4%,负载较为牢固;对不锈钢进行700℃预热处理再负载,可以提高磷酸含量较高的粘结剂(P/Al摩尔比=5)材料的牢固性.
马宏卿沈伯雄
关键词:不锈钢
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