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Distribution of P2O5 between solid solution and liquid phase in dephosphorization slag of CaO-SiO2-FeO-P2O5-Na2O system 认领 引用 被引量：3
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作者 Chuan-ming Du Ning-ning Lv +3 位作者 Chang Su Wei-ming Liu Jin-xing Yang Hai-chuan Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2019年第11期1162-1170,共9页
A multi-phase slag containing Na2O is potential to efficiently dephosphorize high-P hot metal.After dephosphorization,the generated slag with high P2O5 content is regarded as a P resource.Because P2O5 was mainly conce... A multi-phase slag containing Na2O is potential to efficiently dephosphorize high-P hot metal.After dephosphorization,the generated slag with high P2O5 content is regarded as a P resource.Because P2O5 was mainly concentrated in the 2CaO SiO2-3CaO P2O5 solid solution,the recovery of P from dephosphorization slag primarily depends on the separation of the solid solution from other phases.The distribution ratios of P2O5 between solid solution and liquid phase in the CaOSiO2-FeO-P2O5-Nslag system were investigated.The results indicated that the addition of Na2O facilitated the enrichment of P2O5 in the solid solution because it increased not only the distribution ratio of P2O5 but also the mass fraction of the solid solution.The distribution ratio of P2O5 was independent of the P2O5 content in slag.A higher P2O5 content in slag resulted in higher P2O5 and Na2O contents in the solid solution.The distribution ratio of P2O5 increased with the total Fe content in the liquid phase,regardless of the valence of Fe.An increase in the FeO content in slag brought a higher P2O5 content in the solid solution.As slag basicity increased,the distribution ratio of P2O5 increased,but the P2O5 content in the solid solution decreased. 展开更多
关键词 Dephosphorization Steelmaking slag Distribution ratio P2O5 2CaO·SiO2-3CaO·P2O5 solid solution
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Preparation and Magnetic Properties of (Fe_7Co_3)0.15(SiO_2)0.85Granular Solids Using the Sol-Gel Method 认领 引用
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作者 Wei CHEN Denglu HOU +4 位作者 Ying LIU Guide TANG Minggang ZHU Jianguo ZHAO Xiangfu NIE and Hongyan WUTo whom correspondence should be addressed E-mail: dlhou@hebtu.edu.cn 《Journal of Materials Science & Technology》 SCIE EI CAS 1999年第4期389-389,共1页
(Fe7Co3)0.15(SiO2)0.85 granular alloy solid was prepared successfully using sol-gel method. The samples with different reducing temperatures were investigated by X-ray diffractometer(XRD),transmission electron microgr... (Fe7Co3)0.15(SiO2)0.85 granular alloy solid was prepared successfully using sol-gel method. The samples with different reducing temperatures were investigated by X-ray diffractometer(XRD),transmission electron micrography(TEM) and vibrating sample magnetometer(VSM). The av-erage particIe sizes of the samples were also calculated from Scherrer formula. The magnetic properties of (Fe7Co3 )o. 15 (SiO2)0.85 were studied in detail. 展开更多
关键词 SiO2 Fe7Co3 Preparation and Magnetic Properties of Granular Solids Using the Sol-Gel Method
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Solid Phase Synthetic Reaction of Sodium Pyroxene for Na_2CO_3-Fe(OH)_3-H_2SiO_3 System 认领 引用
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作者 WANG Yi-ci ZHANG Jian-liang +1 位作者 WANG Yue-cong LUO Guo-ping 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2013年第1期21-25,共5页
In order to explore synthetic method of pure sodium pyroxene,the pure chemical reagents of Na2CO3,Fe（OH）3 and H2SiO3were used as raw materials,and the possible solid phase reactions for Na2CO3-Fe（OH）3-H2SiO3system... In order to explore synthetic method of pure sodium pyroxene,the pure chemical reagents of Na2CO3,Fe（OH）3 and H2SiO3were used as raw materials,and the possible solid phase reactions for Na2CO3-Fe（OH）3-H2SiO3system in heating process had been studied by means of differential thermal analysis（DTA）and X-ray diffraction（XRD）. The influencing factors of sodium pyroxene（NaFeSi2O6）synthetic reaction,such as sintering temperature and holding time,had also been studied.The results show that sodium pyroxene can be largely synthesized at 737℃;it is helpful for synthesis of sodium pyroxene to increase sintering temperature appropriately,and the best temperature should be controlled at 900℃or so,because it will melt and decompose at temperatures higher than 900℃.In those influencing factors of sodium pyroxene synthesis the most important is temperature.The results will be helpful for providing pure NaFeSi2O6for further research on the formation of SFCA for NaFeSi2O6-KAlSi2O3-CaO-Fe2O3-CaF2 system in the sintering process of Bayan-obo iron ore. 展开更多
关键词 solid phase synthesis sodium pyroxene Naz CO3-Fe（OH）3-H2 SiO3 system
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Efficient production of biodiesel from both esterification and transesterification over supported SO2-_4–MoO_3–ZrO_2–Nd_2O_3/SiO_2 catalysts 认领 引用 被引量：7
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作者 Xiuqin Li Dongmei Tong Changwei Hu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第4期463-471,共9页
SO2-4–Mo O3–Zr O2–Nd2O3/Si O2（SMZN/Si O2） catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2adsorption-desorption isotherms,X-ray diffr... SO2-4–Mo O3–Zr O2–Nd2O3/Si O2（SMZN/Si O2） catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2adsorption-desorption isotherms,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,thermogravimetry analysis（TGA）,ammonia adsorption Fourier transform infrared spectra（NH3-FTIR）,and ammonia adsorption temperature programmed desorption（NH3-TPD） to reveal the dependence of the stable catalytic activity on calcination time. The reason for catalyst deactivation was also studied. The calcination time remarkably affected the types of active centers on SMZN/Si O2-2,and 4 h was found to be the optimal calcination time. SO4 species bonded with small size Zr O2 were found to be the stable active centers,where the leaching of SO2-4and the deposition of coke were inhibited. The deposition of coke was easier on large size Zr O2 than on small size ones. Calcination in air flow could eliminate the deposited coke to recover the deactivated catalysts. 展开更多
关键词 Biodiesel SMZN/SiO2solid acids Stable active centers Small size ZrO2
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红色荧光粉Na8.33La1.67(SiO_4)_6O_2∶Eu3+的制备及发光特性 认领 引用 被引量：3
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作者 金叶 陈远豪 +1 位作者 刘浩文 姚静 《发光学报》 EI CAS CSCD 北大核心 2019年第2期159-163,共5页
采用高温固相法制备了Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu3+红色发光材料,利用X射线衍射仪测定其晶体结构,利用Hitachi F4600表征其发光光谱。在紫外光激发下,样品Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu3+呈多峰发射,分别对应... 采用高温固相法制备了Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu3+红色发光材料,利用X射线衍射仪测定其晶体结构,利用Hitachi F4600表征其发光光谱。在紫外光激发下,样品Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu3+呈多峰发射,分别对应于Eu3+的~5D_0-~7F_j(j=0,1,2,3,4)能级跃迁,主峰是位于615 nm的~5D_0-~7F_2跃迁发射。研究了Eu3+掺杂浓度对材料发光性质的影响,改变Eu3+掺杂浓度,样品的发射强度随之改变,Na_(8. 33)La_(1. 67)(SiO_4)_6O_2∶Eu3+材料的Eu3+浓度为15%时,发光强度最大。讨论了浓度猝灭的机理,理论计算表明引起Eu3+离子能量弥散的主要原因是离子间交换相互作用。 展开更多
关键词 红色荧光粉 固相法 能量弥散 白光LED Na8.33La1.67(SiO4)6O2∶Eu^3+
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固体酸S_2O_82-/Fe_2O_3-SiO_2催化制备马来酸二己酯 认领 引用 被引量：1
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作者 华平 沙兆林 《应用化工》 CAS 2002年第6期3-8,共6页
在铁氧化物中引入硅的氧化物 ,并用S2 O82 -浸渍铁硅复合氧化物 ,制得固体酸催化剂S2 O82 -/Fe2 O3 SiO2 (Ⅰ )。用马来酸酐与正己醇的酯化反应考察了催化剂的活性。通过XRD和TEM分析 ,对催化剂的结构进行了表征。结果表明 ,Ⅰ的最佳制... 在铁氧化物中引入硅的氧化物 ,并用S2 O82 -浸渍铁硅复合氧化物 ,制得固体酸催化剂S2 O82 -/Fe2 O3 SiO2 (Ⅰ )。用马来酸酐与正己醇的酯化反应考察了催化剂的活性。通过XRD和TEM分析 ,对催化剂的结构进行了表征。结果表明 ,Ⅰ的最佳制备条件为 :n(Fe)∶n(Si)为 5∶1、70℃陈化 3h ,2 0 0℃焙烧 2h、用 0 2 5mol/L的 (NH4) 2 S2 O8浸渍 3h、在 5 5 0℃下煅烧 6h ;Ⅰ的催化活性比S2 O2 -8/Fe2 O3 和SO2 -4/Fe2 O3 SiO2 更强 ,S2 O2 -8对Fe2 O3 SiO2 的促进作用明显高于SO2 -4;SiO2 的引入提高了催化剂的分散效果 ;有较好的使用重复性 ;它代替硫酸。 展开更多
关键词 S2O8^2-/Fe2O3-SiO2 固体酸催化剂 马来酸二己酯 酯化反应
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Application of Li_2SiO_3 as a heterogeneous catalyst in the production of biodiesel from soybean oil 认领 引用 被引量：6
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作者 Jian Xun Wang Kung Tung Chen +1 位作者 Shiuh Tsuen Huang Chiing Chang Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第11期1363-1366,共4页
Biodiesel was synthesized from soybean oil by transesterification over Li_2SiO_3 catalyst.The Li_2SiO_3 can be used for biodiesel production directly without further drying or thermal pretreatment,no obvious differenc... Biodiesel was synthesized from soybean oil by transesterification over Li_2SiO_3 catalyst.The Li_2SiO_3 can be used for biodiesel production directly without further drying or thermal pretreatment,no obvious difference in the FAME conversion（92.4-96.7%） between the air-exposed catalyst（24-72 h） and the fresh one（94.2%）.This leads to important benefits when considering industrial applications of Li_2SiO_3 as a solid catalyst for storing and handling catalyst without taking special actions. 展开更多
关键词 Biodiesel Solid catalyst Li2SiO3 Transesterification Triglyceride
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CaAl2Si2O8∶Eu荧光粉发光性能及自还原现象的研究 认领 引用
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作者 靳天雨 崔瑞瑞 +1 位作者 张弛 邓朝勇 《人工晶体学报》 CAS CSCD 北大核心 2018年第8期1637-1641,1646,共5页
采用高温固相法制备了Ca(1-x)Al2Si2O8∶x Eu2+(x=0.005,0.02,0.04,0.06,0.08,0.10,0.20)和加入过量SiO2的Ca Al2Si2O8∶0.04Eu,x SiO2(x=0,0.05,0.100,0.200,0.300)。利用X射线衍射(XRD)对样品的晶体结构进行了表征... 采用高温固相法制备了Ca(1-x)Al2Si2O8∶x Eu2+(x=0.005,0.02,0.04,0.06,0.08,0.10,0.20)和加入过量SiO2的Ca Al2Si2O8∶0.04Eu,x SiO2(x=0,0.05,0.100,0.200,0.300)。利用X射线衍射(XRD)对样品的晶体结构进行了表征,利用荧光光谱仪对样品的发光性能进行了分析。XRD结果表明,所生成的Ca Al2Si2O8∶0.04Eu,x SiO2样品除了因反应未完全的氧化铝杂质相外基本是纯相。Ca(1-x)Al2Si2O8∶x Eu2+样品的激发和发射光谱表明,随着掺杂浓度的增加会出现红移现象。当Eu2+的掺杂浓度为超过4mol%时,出现浓度猝灭。当在空气气氛下烧结时,样品出现现了自还原现象。当过量SiO2的加入,Eu2+的发光强度会逐渐减弱,而Eu3+的发光强度会逐渐增强,SiO2的过量添加可以抑制自还原现象的产生。 展开更多
关键词 CaAl2Si2O8∶Eu2+/3+荧光粉 高温固相法 自还原 SiO2
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固体高分辨核磁共振研究聚氧乙烯/纳米二氧化硅复合物的界面相互作用 认领 引用 被引量：6
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作者 姚叶锋 杨光 陈群 《高等学校化学学报》 SCIE EI CAS 北大核心 2004年第3期531-534,392,共4页
采用固体高分辨核磁共振碳谱对聚氧乙烯 ( PEO) /纳米二氧化硅 ( Nano-Si O2 )复合物体系的相态结构、分子间相互作用和分子运动进行了研究 ,发现随着复合物中 Si O2 含量增加 ,PEO结晶度明显降低 ,且 PEO非晶区的分子运动受到明显约束 ... 采用固体高分辨核磁共振碳谱对聚氧乙烯 ( PEO) /纳米二氧化硅 ( Nano-Si O2 )复合物体系的相态结构、分子间相互作用和分子运动进行了研究 ,发现随着复合物中 Si O2 含量增加 ,PEO结晶度明显降低 ,且 PEO非晶区的分子运动受到明显约束 ,基于对 PEO非晶区及 Si O2 颗粒表面羟基质子的自旋 -自旋弛豫行为的分析 ,提出了复合物的界面模型以及 Si O2 与 展开更多
关键词 聚氧乙烯 纳米二氧化硅 固体高分辨核磁共振 界面相互作用 聚合物固体电解质
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Solid state cathodoluminescence based on tris-(8-hydroxyquinoline) aluminum and its quenching mechanism 认领 引用
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作者 LianBin Niu YunXia Guan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2010年第5期783-787,共5页
A novel solid state cathodoluminescence(SSCL) device(the device has a structure of ITO/SiO2/Alq3/SiO2/Al) is fabricated using organic materials as the fluorescent film sandwiched between two SiO2 layers.When alternati... A novel solid state cathodoluminescence(SSCL) device(the device has a structure of ITO/SiO2/Alq3/SiO2/Al) is fabricated using organic materials as the fluorescent film sandwiched between two SiO2 layers.When alternating current(AC) voltage is applied to this device,uniform emissions are observed.When the voltage is 50 V,a longer wavelength emission(522 nm) is obtained,but the shorter wavelength emission(465 nm) is dominant when the voltage is 76 V.The origins of these emissions are discussed.The interface formed between SiO2 and tris-(8-hydroquinoline) aluminum(Alq3) of SSCL device was investigated by using X-ray photoelectron spectroscopy(XPS).Analyses of the XPS spectra reveal a deep diffusion of the indium into the interface.On the other hand,the interaction between indium and Alq3 occurs at the interface and results in the formation of a carbon-oxygen-metal(In or Al) complex in the contact region.This effect causes a luminescence quenching in the SSCL device. 展开更多
关键词 B2solid state cathodoluminescence(SSCL) tris-(8-hydroquinoline) aluminum(Alq3) SiO2 X-ray photoelectron spectroscopy(XPS) interface
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