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超声辅助H2O2-CH3COOH脱除宁东煤中硫分和灰分研究 被引量:5
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作者 金权 李梅 +3 位作者 孙功成 程雪云 李佳佳 徐荣声 《煤炭转化》 CAS CSCD 北大核心 2020年第1期72-80,共9页
选取宁夏宁东两种煤样ND1和ND2作为研究对象,在超声频率为40 kHz,功率为800 W下,以H2O2-CH3COOH为助剂,分别超声作用5 min,10 min,20 min,30 min,40 min,50 min,60 min和120 min。对超声作用前后的煤样进行化学法形态硫分析、FTIR、XPS... 选取宁夏宁东两种煤样ND1和ND2作为研究对象,在超声频率为40 kHz,功率为800 W下,以H2O2-CH3COOH为助剂,分别超声作用5 min,10 min,20 min,30 min,40 min,50 min,60 min和120 min。对超声作用前后的煤样进行化学法形态硫分析、FTIR、XPS、BET、XRD和IC分析。结果表明:随着超声作用时间的延长,全硫脱除率逐渐变大,超声作用60 min后再延长时间,全硫含量变化较小。当超声作用60 min时,ND1和ND2的最大全硫脱除率分别为44.05%和55.33%,硫铁矿硫的最大脱除率分别为34.62%和51.52%,硫酸盐硫的最大脱除率分别为58.33%和57.14%,有机硫的最大脱除率分别29.06%和48.04%;超声处理后样品中含氧官能团含量增加,低价态硫向高价态转化,硫可以被氧化为硫酸根而被脱除;超声处理后样品孔径和比表面积变大,改善了固液接触效果;超声能脱除煤中的矿物质,ND1和ND2中的灰分分别由24.25%和13.96%下降至7.65%和10.98%,最大脱灰率分别为68.45%和21.34%。 展开更多
关键词 超声波 h2o2-ch3cooh 脱硫 脱灰 硫铁矿硫 有机硫
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高硫煤的H_2O_2-CH_3COOH溶液体系脱硫研究 被引量:3
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作者 金会心 吴复忠 《煤炭转化》 CAS CSCD 北大核心 2013年第4期62-67,共6页
采用H2O2-CH3COOH溶液体系对高硫煤进行了脱硫研究,结果表明,H2O2-CH3COOH的溶液体系可有效脱除煤中的硫铁矿硫和有机硫,实验获得的较佳脱硫条件是溶液初始的H2O2质量分数为10%,n(H2O2)∶n(CH3COOH)为10,温度为室温,反应时间60min,液固... 采用H2O2-CH3COOH溶液体系对高硫煤进行了脱硫研究,结果表明,H2O2-CH3COOH的溶液体系可有效脱除煤中的硫铁矿硫和有机硫,实验获得的较佳脱硫条件是溶液初始的H2O2质量分数为10%,n(H2O2)∶n(CH3COOH)为10,温度为室温,反应时间60min,液固比为3∶1,搅拌速率300r/min;在此条件下,煤中硫铁矿硫的脱出率和有机硫的脱出率均可达到65%以上.对该体系的脱硫机理分析表明,H2O2的氧化性在CH3COOH的催化作用下得以加强,促使反应生成更多的羟基自由基(·OH)和过氧羟基自由基(·OOH),这些自由基具有较高的电负性或电子亲和能,能够加速脱硫反应的进行,从而实现硫铁矿硫或有机硫从煤中的脱除. 展开更多
关键词 高硫煤 h2o2-ch3cooh 脱硫
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微波辅助H_2O_2-CH_3COOH氧化脱除柴油中的硫
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作者 周生学 马梅霞 +1 位作者 刘世巍 张波 《湖北农业科学》 2015年第15期3741-3743,共3页
使用微波辅助H2O2-CH3COOH试剂氧化0#柴油脱硫,在反应温度为70℃,复合氧化剂冰乙酸(CH3COOH)和H2O2体积比为1∶1,微波频率为2 450 MHz时,通过改变微波功率、剂油体积比和反应时间确定柴油中硫的最佳脱除效果。结果显示,在微波功率为380... 使用微波辅助H2O2-CH3COOH试剂氧化0#柴油脱硫,在反应温度为70℃,复合氧化剂冰乙酸(CH3COOH)和H2O2体积比为1∶1,微波频率为2 450 MHz时,通过改变微波功率、剂油体积比和反应时间确定柴油中硫的最佳脱除效果。结果显示,在微波功率为380 W,剂油体积比为8∶1,反应7 min时,柴油中硫的脱除率达88.5%。 展开更多
关键词 柴油 脱硫 h2o2-ch3cooh复合氧化剂 微波辅助
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Nitric acid pressure leaching of limonitic laterite ores:Regeneration of HNO3 and simultaneous synthesis of fibrous CaSO4·2H2O by-products 被引量:7
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作者 SHAO Shuang MA Bao-zhong +3 位作者 WANG Xin ZHANG Wen-juan CHEN Yong-qiang WANG Cheng-yan 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3249-3258,共10页
An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and... An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and its commercial application,but it has not been systematically investigated.Herein,regenerating HNO3 from Ca(NO3)2 solution with low-cost H2SO4,and simultaneous synthesis of fibrous CaSO4·2H2O by-products were studied.As a theoretical basis,the solubility of CaSO4·2H2O in HNO3 medium is studied.It is concluded that the solubility of CaSO4·2H2O increases with increasing temperature or increasing HNO3 concentration,which has considerable guiding significance for the subsequent experimental research and analysis.Then,the effects of various factors on the residual Ca^2+ concentration of filtrate,the regenerated HNO3 concentration and the morphology of synthesized products are investigated using ICP-AES and SEM.And the effect mechanism is also analyzed.The results indicate the regenerated HNO3 concentration reaches 116 g/L with the residual Ca^2+ concentration being 9.7 g/L at the optimum conditions.Moreover,fibrous CaSO4·2H2O by-products with high aspect ratios(length,406.32μm;diameter,14.71μm;aspect ratio,27.62)can be simultaneously synthesized. 展开更多
关键词 limonitic laterite ores Ca(No3)2 solution hNo3 regeneration CaSo2h2o by-products SoLUBILITY
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Direct synthesis of single-phase α-CaSO4·0.5H2O whiskers from waste nitrate solution 被引量:1
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作者 Shuang Shao Baozhong Ma +4 位作者 Yongqiang Chen Wenjuan Zhang Bao Liu Peng Xing Chengyan Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第6期1752-1754,共3页
Single-phaseα-CaSO4·0.5H2O whiskers were directly synthesized from waste Ca(NO3)2 solution using a hydrothermal method,and HNO3 was synchronously regenerated.The effects of reaction temperature and Ca^2+concentr... Single-phaseα-CaSO4·0.5H2O whiskers were directly synthesized from waste Ca(NO3)2 solution using a hydrothermal method,and HNO3 was synchronously regenerated.The effects of reaction temperature and Ca^2+concentration on the phase composition and morphology of products were determined by X-ray diffraction and optical microscopy.On the basis of the experimental results,the formation diagram ofα-CaSO4·0.5H2O was plotted within the range of 5–35 g·L^-1 Ca^2+and 115°C–150°C.In addition,the conditions of the direct synthesis ofα-CaSO4·0.5H2O were determined.Well-crystallized,single-phaseα-CaSO4·0.5H2O whiskers with high aspect ratios(length,1785μm;diameter,10.63μm;aspect ratio,168)and HNO3(70.25 g·L^-1)were obtained at the optimal conditions of 25 g·L^-1 Ca^2+and 125°C. 展开更多
关键词 α-CaSo4·0.5h2o whiskers Direct synthesis Formation diagram Waste Ca(No3)2 solution hNo3 regeneration
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Temporal Stability Analysis of Magnetized Hybrid Nanofluid Propagating through an Unsteady Shrinking Sheet: Partial Slip Conditions 被引量:1
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作者 Liaquat Ali Lund Zurni Omar +3 位作者 Sumera Dero Yuming Chu Ilyas Khan Kottakkaran Sooppy Nisar 《Computers, Materials & Continua》 SCIE EI 2021年第2期1963-1975,共13页
The unsteady magnetohydrodynamic(MHD)flow on a horizontal preamble surface with hybrid nanoparticles in the presence of the first order velocity and thermal slip conditions are investigated.Alumina(Al_(2)O_(3))and cop... The unsteady magnetohydrodynamic(MHD)flow on a horizontal preamble surface with hybrid nanoparticles in the presence of the first order velocity and thermal slip conditions are investigated.Alumina(Al_(2)O_(3))and copper(Cu)are considered as hybrid nanoparticles that have been dispersed in water in order to make hybrid nanofluid(Cu-Al_(2)O_(3)/water).The system of similarity equations is derived from the system of partial differential equations(PDEs)by using variables of similarity,and their solutions are gotten with shooting method in the Maple software.In certain ranges of unsteadiness and magnetic parameters,the presence of dual solutions can be found.Further,it is examined that layer separation is deferred due to the effect of the hybrid nanoparticles.Moreover,the capacity of the thermal enhancement of Cu-Al_(2)O_(3)/water hybrid nanofluid is higher as compared to Al_(2)O_(3)/water based nanofluid and enhancements inCu are caused to rise the fluid temperature in both solutions.In the last,solutions stability analyzes were also carried out and the first solution was found to be stable. 展开更多
关键词 Cu−Al_(2)o_(3)/h2o hybrid nanofluid magnetic field slip conditions dual solutions
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Synthesis and Thermodynamic Properties of MgO·B_2O_3·4H_2O
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作者 刘志宏 高世扬 +1 位作者 胡满成 夏树屏 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2002年第12期1519-1522,1461,共5页
A new magnesium borate MgO·B 2O 3·4H 2O was synthesized by the method of phase transformation of double salt and characterized by XRD, IR spectra and TG. The structural formula of this compound was Mg[B ... A new magnesium borate MgO·B 2O 3·4H 2O was synthesized by the method of phase transformation of double salt and characterized by XRD, IR spectra and TG. The structural formula of this compound was Mg[B 2O(OH) 6]·H 2O. The enthalpy of solution of MgO·B 2O 3·4H 2O in HCl (1.0492 mol·L -1) was determined. With the incorporation of the standard molar enthalpies of formation of MgO (s), H 3BO 3 (s), and H 2O (l), the standard molar enthalpy of formation of -(3135.31±1.68) kJ·mol -1 of MgO·B 2O 3·4H 2O was obtained. Thermodynamic properties of this compound were also calculated by group contribution method. 展开更多
关键词 Mgo·B 2o 3·4h 2o SYNThESIS thermodynamic properties solution calorimetry
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面向5 nm CMOS技术代堆叠纳米线释放工艺研究 被引量:2
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作者 曹志军 张青竹 +7 位作者 吴次南 闫江 王桂磊 李俊杰 张兆浩 殷华湘 余金中 李志华 《真空科学与技术学报》 EI CAS CSCD 北大核心 2018年第2期121-126,共6页
针对5 nm CMOS技术代亟待解决的纳米线释放难题,通过实验探究了HF(6%)∶H_2O_2(30%)∶CH_3COOH(99.8%)=1∶2∶3的混合溶液放置时间对纳米尺度外延堆叠GeSi/Si/GeSi/Si结构释放影响。混合溶液放置时间在48 h内,GeSi层的腐蚀速率会随着溶... 针对5 nm CMOS技术代亟待解决的纳米线释放难题,通过实验探究了HF(6%)∶H_2O_2(30%)∶CH_3COOH(99.8%)=1∶2∶3的混合溶液放置时间对纳米尺度外延堆叠GeSi/Si/GeSi/Si结构释放影响。混合溶液放置时间在48 h内,GeSi层的腐蚀速率会随着溶液的放置时间的增加而变大,48 h后腐蚀速率趋于稳定。另外,在厚度相同的情况下,Ge Si层的腐蚀速率会随着Ge含量的增加而变大。本文实现了腐蚀纳米尺度GeSi的同时没有对Si造成损伤,对于厚度为31.3 nm的GeSi层,腐蚀的深宽比达到了17∶1,而且没有出现倒塌现象。该湿法腐蚀工艺对于5 nm及以下技术代堆叠纳米线制造、SON结构、新型MEMS和传感器件制造等具有一定的借鉴和指导意义。 展开更多
关键词 GESI hF-h2o2-ch3cooh溶液 纳米线 Ch3cooh
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regeneration of thermally deactivated commercial V-W-Ti catalysts 被引量:3
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作者 Xuesong SHANG Jianrong LI +2 位作者 Xiaowei YU Jinsheng CHEN Chi HE 《Frontiers of Chemical Science and Engineering》 CAS CSCD 2012年第1期38-46,共9页
An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH4C1 (l mol/L) and dilute H2SO4 (0.5 tool/L), were ... An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH4C1 (l mol/L) and dilute H2SO4 (0.5 tool/L), were employed to treat the used catalyst. The effects of temperature and the regeneration process on the structural and textural properties of the catalysts were determined by X-ray diffraction, scanning electron microscopy, N2 adsorption/desorption, elemental analysis and Fourier transform infrared spectroscopy. The results suggest that the anatase phase of the used catalyst is maintained after exposure to high temperatures. Some of the catalytic activity was restored after regeneration. The catalyst regenerated by aqueous NH4C1 had a higher activity than that of the catalyst treated by dilute H2SO4. The main reason is that the NH3 generated from the decomposition of NH4C1 at high temperatures can be adsorbed onto the catalyst which promotes the reaction. The aggregated V205 were partially re-dispersed during the regeneration process, and the intrinsic oxidation of ammonia with high concentrations of O2 is a factorthat suppresses the catalytic activity. 展开更多
关键词 V2o5-Wo3/Tio2 catalysts thermal deactiva-tion REGENERATIoN Nh4C1 dilute h2So4 solution
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