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Preparation of Z-scheme WO_3(H_2O)0.333/Ag_3PO_4 composites with enhanced photocatalytic activity and durability 认领 引用 被引量：8
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作者 Zhen Li Xia Wang +3 位作者 Jinfeng Zhang Changhao Liang Luhua Lu Kai Dai 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第3期326-334,共9页
Ag3PO4 is widely used in the field of photocatalysis because of its unique activity. However, photocorrosion limits its practical application. Therefore, it is very urgent to find a solution to improve the light corro... Ag3PO4 is widely used in the field of photocatalysis because of its unique activity. However, photocorrosion limits its practical application. Therefore, it is very urgent to find a solution to improve the light corrosion resistance of Ag3PO4. Herein, the Z-scheme WO3(H2O)0.333/Ag3PO4 composites are successfully prepared through microwave hydrothermal and simple stirring. The WO3(H2O)0.333/Ag3PO4 composites are characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV-Vis spectroscopy. In the degradation of organic pollutants, WO3(H2O)0.333/Ag3PO4 composites exhibit excellent performance under visible light. This is mainly attributed to the synergy of WO3(H2O)0.333 and Ag3PO4. Especially, the photocatalytic activity of 15%WO3(H2O)0.333/Ag3PO4 is the highest, and the methylene blue can be completely degraded in 4 min. In addition, the stability of the composites is also greatly enhanced. After five cycles of testing, the photocatalytic activity of 15%WO3(H2O)0.333/Ag3PO4 is not obviously decreased. However, the degradation efficiency of Ag3PO4 was only 20.2%. This indicates that adding WO3(H2O)0.333 can significantly improve the photoetching resistance of Ag3PO4. Finally, Z-scheme photocatalytic mechanism is investigated. 展开更多
关键词 Photocatalysis Ag3PO4 WO3(H2O)0.333 Composites Z-scheme
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The effects of radiation damage on power VDMOS devices with composite SiO_2-Si_3N_4 films 认领 引用 被引量：3
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作者 高博 刘刚 +5 位作者 王立新 韩郑生 宋李梅 张彦飞 腾瑞 吴海舟 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期393-398,共6页
Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships amon... Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships among the important electrical parameters of the samples with different thickness SiO2-Si3N4 films,such as threshold voltage,breakdown voltage,and on-state resistance in accumulated dose,are discussed.The total dose experiment results show that the breakdown voltage and the on-state resistance barely change with the accumulated dose.However,the relationships between the threshold voltages of the samples and the accumulated dose are more complex,and not only positively drift,but also negatively drift.At the end of the total dose experiment,we select the group of samples which have the smaller threshold voltage shift to carry out the single event effect studies.We find that the samples with appropriate thickness ratio SiO2-Si3N4 films have a good radiation-hardening ability.This method may be useful in solving both the SEGR and the total dose problems with the composite SiO2-Si3N4 films. 展开更多
关键词 power VDMOS device total dose effects single event effects composite SiO2-Si3N4 films
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Fabrication and characterization of SiO2(f)/Si)_3N_4 composites 认领 引用 被引量：4
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作者 Yongsheng Liu Laifei Cheng +2 位作者 Litong Zhang Yongdong Xu Yi Liu 《Journal of University of Science and Technology Beijing》 2007年第5期454-459,共6页
A silicon dioxide fiber-reinforced silicon nitride matrix(SiOJSi3N4)composite used for radomes was prepared by chemical vapor infiltration(CVI)process using the SiCl4-NH3-H2 system.The effects of the process condition... A silicon dioxide fiber-reinforced silicon nitride matrix(SiOJSi3N4)composite used for radomes was prepared by chemical vapor infiltration(CVI)process using the SiCl4-NH3-H2 system.The effects of the process conditions,including infiltration temperature,infiltration time,and gas flux were investigated.The energy dispersion spectra(EDS)result showed that the main elements of this composite contained Si,N,and O.The X-ray diffraction(XRD)results indicated that phases of the composite before and after treatment at 1350℃were all amorphous.A little fiber pull-out was observed on the cross section of the composite by scan electron microscope(SEM).As a result,the composite exhibited good thermal stability,but an appropriate interface was necessary between the fiber and the matrix. 展开更多
关键词 SiO2/Si3N4 composite fabrication characterization chemical vapor infiltration
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Fracture Mechanism of 3D, Five-directional Braided (SiO_2)_f /SiO_2 Composites Prepared by Silicasol-infiltration-sintering Method 认领 引用 被引量：1
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作者 李斌斌 ZHU Jianxun +2 位作者 LIN Long LIU Yong CHEN Zhaofeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第2期355-357,共3页
Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural stren... Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural strength and flexural elastic modulus were found to be 73 MPa and 12 GPa, respectively. The results of stress vs deflection curve and SEM examinations revealed that the fracture mechanism of 3D, five-directional braided （SiO2）/SiO2 composite was a mixture mode of ductile and brittle. The ductile mode was attributed to the weak bonding strength of fiber/matrix at low temperature. The brittle fracture might be caused by the propagation of micro defect or crack, which existed in the as-prepared composites for the ten-cycle process. 展开更多
关键词 fracture mechanism 3D five-directional （SiO2）y/SiO2 composite silicasol-infiltrationsintering method
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PREPARATION,CHARACTERIZATION AND HYDROGENATION PROPERTY OF POLYMER-SUPPORTED Pd-Fe_2O_3 COMPOSITE CATALYSTS 认领 引用
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作者 ZHANG Shengmin HU Weibing ZHANG Manzheng Wuhan University of Technology Hubei Research Institute of Chemistry 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1999年第4期48-52,共5页
A series of polymer- supported Pd -Fe2O3 composite catalysts were prepared and their hydrogenation property mas investigated. It was found that the above catalysts have good catalytic hydrogenation activity for carbon... A series of polymer- supported Pd -Fe2O3 composite catalysts were prepared and their hydrogenation property mas investigated. It was found that the above catalysts have good catalytic hydrogenation activity for carbon - carbon double bonds systems and reusability. Furthermore, XPS and IR spectra shouted that active component in the composite catalysts is atomic Pd(0). An addition of a small amount of Fe2O3 has a promotive action upon hydrogenation activity of the catalysts, which indicated that there are some strong interactions (electron transfer) between Pd(0) and Fe(Ⅲ) species. Based on these results, a possible catalytic hydrogenation mechanism was also suggested. 展开更多
关键词 functional material polymet-sup- ported catalyst composite Pd - F2O3/polystyrene hydrogenation mechanism
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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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Influence of catalyst support structure on ethene/decene metathesis and coke formation over WO_3/SiO_2 catalyst 认领 引用 被引量：1
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作者 Zheng Min Chen Sheng-Li +4 位作者 Zhang Jun-Hui Liu Yan Sang Lei You Ju Wang Xiao-Dong 《Petroleum Science》 SCIE CAS CSCD 2013年第1期112-119,共8页
8wt%WO3/SiO2 metathesis （disproportionation） catalysts with different pore structures were prepared by the incipient-wetness-impregnation method. The as-synthesized catalysts were characterized by N2 adsorpfion-deso... 8wt%WO3/SiO2 metathesis （disproportionation） catalysts with different pore structures were prepared by the incipient-wetness-impregnation method. The as-synthesized catalysts were characterized by N2 adsorpfion-desorption, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, UV-visible diffuse reflectance spectroscopy （DRS） and scanning transmission electron microscopy-high-angle annular dark field （STEM HAADF）. The results of STEM HAADF showed that WO3 species were not uniformly distributed on the SiO2 support. The experimental results of 8wt%WO3/SiO2 performance in ethene/decene metathesis revealed that the catalytic effect of 8wt%WO3/SiO2 catalyst and coke formation over it were closely related to the support pore structure： The 8wt%WO3/SiO2 catalyst with a more complicated pore structure showed better catalytic performance but the coke deposition rate was also faster. 展开更多
关键词 Metathesis WO3/SiO2 catalysts pore structure coke formation
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Fe2O3-SiO2复合气凝胶材料的制备及耐温性能 认领 引用 被引量：2
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作者 侯建业 张忠伦 +2 位作者 付晓晴 王明铭 刘振森 《耐火材料》 CAS 北大核心 2025年第2期133-137,共5页
为了提高SiO2气凝胶在高温下的隔热性能,以溶胶-凝胶两步法制备SiO2前驱体溶液,将遮光剂Fe2O3粉末添加到SiO2前驱体溶液中,结合二氧化碳超临界干燥技术,制备出Fe2O3-SiO2复合气凝胶,探究Fe2O3遮光剂的添... 为了提高SiO2气凝胶在高温下的隔热性能,以溶胶-凝胶两步法制备SiO2前驱体溶液,将遮光剂Fe2O3粉末添加到SiO2前驱体溶液中,结合二氧化碳超临界干燥技术,制备出Fe2O3-SiO2复合气凝胶,探究Fe2O3遮光剂的添加(Fe2O3外加质量分数分别为0、0.2%、0.5%、1.0%和3.0%)对气凝胶的影响。结果表明:1)Fe2O3添加到气凝胶中,不会影响气凝胶的形貌;Fe2O3的添加抑制了材料因高温造成的质量损失,提高了复合材料在高温下的稳定性。2)温度低于800℃时,Fe2O3外加量为0.5%(w)的试样,其热导率最低,隔热性能最好;而在800~1000℃温度下,Fe2O3外加量为1%(w)的试样,其热导率最低,仍保持较好的纳米多孔结构。3)通过控制Fe2O3外加量,可以得到适用于不同温度段的复合气凝胶。 展开更多
关键词 Fe2O3-SiO2复合气凝胶 遮光剂 孔结构 热导率 高温性能
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TiO2-Loaded WO3 Composite Films for Enhancement of Photocurrent Density 认领 引用
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作者 Wen-Gui Wang Li Zhu +1 位作者 Yu-Yan Weng Wen Dong 《Chinese Physics Letters》 SCIE EI CAS CSCD 2017年第2期112-116,共5页
Titanium dioxide （TiO2） loaded tungsten trioxide （WO3） composite films are prepared by an E-beam vapor system. Associated with the existence of a heterojunction at the interface of TiO2 and WO3, the prepared TiO2-... Titanium dioxide （TiO2） loaded tungsten trioxide （WO3） composite films are prepared by an E-beam vapor system. Associated with the existence of a heterojunction at the interface of TiO2 and WO3, the prepared TiO2-WO3 composite film shows enhanced photocurrent density, four times than the pure WO3 film illuminated under xenon lamp, and higher incident-photon-to-current conversion e^ciency. By varying the initial TiO2 film thickness, such composite structures could be optimized to obtain the highest photocurrent density. We believe that thin TiO2 films improve the light response and increase the surface roughness of WO3 films. Furthermore, the existence of the heterojunction results in the e^cient charge carriers＇ separation, transfer process, and a lower recombination of electron-hole pairs, which is beneficial for the enhancement of photocurrent density. 展开更多
关键词 TiO2-Loaded WO3 Composite Films for Enhancement of Photocurrent Density FTO
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Improving the denitration performance and K-poisoning resistance of the V_2O_5-WO_3/TiO_2 catalyst by Ce4+ and Zr4+ co-doping 认领 引用 被引量：22
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作者 Jun Cao Xiaojiang Yao +4 位作者 Fumo Yang Li Chen Min Fu Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期95-104,共10页
A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐W... A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐WO3/TiO2 catalyst.The physicochemical properties were investigated by using XRD,BET,NH3‐TPD,H2‐TPR,and XPS,and the catalytic performance and K‐poisoning resistance were evaluated via a NH3‐SCR model reaction.Ce^4+and Zr^4+co‐doping were found to enhance the conversion of NOx,and exhibit the best K‐poisoning resistance owing to the largest BET‐specific surface area,pore volume,and total acid site concentration,as well as the minimal effects on the surface acidity and redox ability from K poisoning.The V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst also presents outstanding H2O+SO2 tolerance.Finally,the in situ DRIFTS reveals that the NH3‐SCR reaction over the V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst follows an L‐H mechanism,and that K poisoning does not change the reaction mechanism. 展开更多
关键词 V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst Co‐doping K‐poisoning NH3‐SCR Reaction mechanism
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Tb^3+和Na2WO4共掺杂SiO2材料的制备及其发光性质 认领 引用 被引量：4
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作者 王喜贵 李霞 《光谱学与光谱分析》 SCIE EI CAS 北大核心 2008年第2期260-264,共5页
通过溶胶-凝胶技术制备了稀土离子Tb3+和Na2WO4共掺杂的SiO2材料,利用DTA-TG,IR,XRD等测试手段研究了材料的结构。材料属于非晶态,800℃退火后Tb3+和Na2WO4共掺杂样品的主要结构为SiO2的网状结构。通过三维荧光光谱,荧光激发光谱和发射... 通过溶胶-凝胶技术制备了稀土离子Tb3+和Na2WO4共掺杂的SiO2材料,利用DTA-TG,IR,XRD等测试手段研究了材料的结构。材料属于非晶态,800℃退火后Tb3+和Na2WO4共掺杂样品的主要结构为SiO2的网状结构。通过三维荧光光谱,荧光激发光谱和发射光谱,分析探讨了Na2WO4对掺稀土离子的SiO2体系发光性质的影响。结果显示,在230nm激发下,样品显示Tb3+的5D4—7Fj(j=4,5,6)和5D3—7Fj(j=4,5,6)发射光谱,在紫外灯的照射下,发射均匀的蓝绿色荧光,说明样品掺杂均匀且分散性较好。Na2WO4的掺入,并不影响Tb3+在SiO2基质中的发射峰的主要位置,但对发光强度有很大的影响,敏化了5D4—7F6蓝色跃迁而猝灭了5D4—7F5绿色跃迁,使材料发射蓝绿色荧光。文章通过所得的能级图,对样品的跃迁机理进行了分析。 展开更多
关键词 溶胶-凝胶技术 Tb^3+和Na2WO4共掺杂SiO2体系 发光性质
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镀有SiO_2-WO_3纳米复合薄膜LPFG气体传感特性研究 认领 引用 被引量：2
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作者 彭勇 于清旭 《传感技术学报》 CAS 北大核心 2007年第7期1467-1470,共4页
以钨粉和正硅酸乙酯为原料,采用溶胶-凝胶工艺和浸渍提拉镀膜方法,在玻璃衬底上制备出了具有气敏传感特性的SiO2-WO3纳米复合薄膜.采用原子力显微镜和X射线衍射仪表征了薄膜样品的表面形貌和物相结构.实验结果表明:掺杂SiO2使WO3薄膜中... 以钨粉和正硅酸乙酯为原料,采用溶胶-凝胶工艺和浸渍提拉镀膜方法,在玻璃衬底上制备出了具有气敏传感特性的SiO2-WO3纳米复合薄膜.采用原子力显微镜和X射线衍射仪表征了薄膜样品的表面形貌和物相结构.实验结果表明:掺杂SiO2使WO3薄膜中的颗粒尺寸减小,空隙率提高,比表面积增大.将SiO2-WO3复合薄膜镀于长周期光纤光栅上(LPFG),在室温条件下,将LPFG置于体积分数为2%的NO气体中,LPFG谐振峰红移了4.77 nm,损耗由-9.93 dB变为-8.53 dB,相应的气体传感灵敏度达到3%,元件响应时间10 s,恢复时间20 s. 展开更多
关键词 溶胶-凝胶工艺 SiO2 WO3 LPFG 气敏特性
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WO_3在气相吸附法制备的TiO_2/SiO_2复合载体表面的分散状态 认领 引用 被引量：3
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作者 邓存 《天然气化工—C1化学与化工》 北大核心 2006年第1期15-20,共6页
采用气相流动吸附法制备了TiO2/SiO2复合载体,用浸渍法制备了WO3/(TiO2/SiO2)催化剂,应用XRD和LRS等技术研究了TiO2在SiO2表面及WO3在TiO2/SiO2复合载体表面上的分散状态。结果表明,TiO2在复合载体中的载量低于其分散阈值时,它在SiO2表... 采用气相流动吸附法制备了TiO2/SiO2复合载体,用浸渍法制备了WO3/(TiO2/SiO2)催化剂,应用XRD和LRS等技术研究了TiO2在SiO2表面及WO3在TiO2/SiO2复合载体表面上的分散状态。结果表明,TiO2在复合载体中的载量低于其分散阈值时,它在SiO2表面呈单层但非密置单层分散;WO3在催化剂中的载量低于其分散阈值时,它在复合载体表面亦呈单层但非密置单层分散。TiO2在SiO2表面上的分散可改善WO3的分散状态,提高WO3在SiO2表面上的分散阈值。 展开更多
关键词 气相吸附法 TiO2/SiO2复合载体 单层分散 WO3(TiO2/SiO2)催化剂 X-射线衍射分析 激光喇曼光谱
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介孔复合催化剂WO_3/SiO_2催化合成壬二酸的研究 认领 引用 被引量：1
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作者 盛凤军 倪春梅 《化学工程师》 CAS 2011年第11期56-59,67,共4页
以油酸为原料,以自制的介孔WO3/SiO2为催化剂,研究了以H2O2为氧化剂制取壬二酸的过程。系统地考察了催化剂中的Si/W、催化剂用量、H2O2用量与加入方式、反应时间等对壬二酸收率产生的影响。通过实验得到的最佳工艺条件为:油酸20g、叔丁... 以油酸为原料,以自制的介孔WO3/SiO2为催化剂,研究了以H2O2为氧化剂制取壬二酸的过程。系统地考察了催化剂中的Si/W、催化剂用量、H2O2用量与加入方式、反应时间等对壬二酸收率产生的影响。通过实验得到的最佳工艺条件为:油酸20g、叔丁醇50mL、WO3/介孔SiO2催化剂0.5g、30%H2O235g,加热回流,通O2反应36h。 展开更多
关键词 WO3/SiO2复合催化剂 油酸 壬二酸 过氧化氢
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WO_3/MoO_3/SiO_2催化合成柠檬酸三丁酯 认领 引用 被引量：3
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作者 杨秀群 邹贵田 《贵阳学院学报（自然科学版）》 2011年第2期49-52,共4页
用正丁醇和柠檬酸为原料,WO3/MoO3/SiO2为催化剂催化合成柠檬酸三丁酯。通过考察醇与酸的物质的量比,反应温度和反应时间,催化剂用量和溶剂用量对酯化反应的影响。确定合成柠檬酸三丁酯的最佳反应条件为n(正丁醇)(柠檬酸)=4.5,催化剂用... 用正丁醇和柠檬酸为原料,WO3/MoO3/SiO2为催化剂催化合成柠檬酸三丁酯。通过考察醇与酸的物质的量比,反应温度和反应时间,催化剂用量和溶剂用量对酯化反应的影响。确定合成柠檬酸三丁酯的最佳反应条件为n(正丁醇)(柠檬酸)=4.5,催化剂用量为反应物柠檬酸质量的6%,反应温度130-140℃,反应时间3.5h,酯化率最高达98.5%,产率最高达94.3%。WO3/MoO3/SiO2催化剂可重复使用,其催化活性基本不变。实验对合成的产品进行了红外光谱分析及折光率的测定,与文献值相符。 展开更多
关键词 柠檬酸三丁酯 WO3/MoO3/SiO2催化剂 酯化反应
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负载型WO_3/SiO_2-Al_2O_3催化剂用于合成乙酸乙酯反应研究 认领 引用
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作者 柳娜 雷艳艳 +1 位作者 贺新福 周安宁 《精细化工》 CAS CSCD 北大核心 2014年第5期581-585,共5页
考察了SiO2、γ-Al2O3和SiO2-Al2O3载体负载氧化钨作为催化剂用于乙酸乙酯合成反应研究,并通过XRD、氮气物理吸附、Raman和NH3-TPD对催化剂进行表征。结果表明,氧化钨负载在SiO2-Al2O3载体上,具有更强的酸性和更高的酸量,有利于促进乙... 考察了SiO2、γ-Al2O3和SiO2-Al2O3载体负载氧化钨作为催化剂用于乙酸乙酯合成反应研究,并通过XRD、氮气物理吸附、Raman和NH3-TPD对催化剂进行表征。结果表明,氧化钨负载在SiO2-Al2O3载体上,具有更强的酸性和更高的酸量,有利于促进乙酸乙酯合成反应进行。当W在SiO2-Al2O3载体表面的负载量为8%(质量分数,下同)时,乙酸转化率最高可以达到69.7%,载体表面WO3晶体颗粒不利于提高酯化反应活性。 展开更多
关键词 WO3 SiO2-Al2O3 酯化反应 乙酸乙酯 催化与分离提纯技术
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WO_3/MoO_3/SiO_2催化合成乙酸正丁酯 认领 引用 被引量：1
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作者 杨秀群 谢彩 《贵阳学院学报（自然科学版）》 2012年第3期47-49,共3页
用正丁醇和冰乙酸为原料,WO3/MoO3/SiO2为催化剂合成乙酸正丁酯,对产品进行折光率测定,同时考察醇和酸的物质的量比,反应温度和催化剂用量等因素对反应的影响,确定合成乙酸正丁酯的最佳反应条件为:n(正丁醇)(冰乙酸)=1.6:1,催化剂用量... 用正丁醇和冰乙酸为原料,WO3/MoO3/SiO2为催化剂合成乙酸正丁酯,对产品进行折光率测定,同时考察醇和酸的物质的量比,反应温度和催化剂用量等因素对反应的影响,确定合成乙酸正丁酯的最佳反应条件为:n(正丁醇)(冰乙酸)=1.6:1,催化剂用量为反应物乙酸质量的2.5%,反应温度120-130℃,该条件下产率最高达95.8%,重复使用催化剂,产品收率变化不大。结果表明WO3/MoO3/SiO2具有催化活性高、易回收、可重复使用、无废液排放等优点。 展开更多
关键词 乙酸正丁酯 WO3/MoO3/SiO2催化剂 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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WO_3/SiO_2的制备及其催化环己酮清洁合成己二酸 认领 引用 被引量：6
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作者 郝志华 杨浩 +1 位作者 何建英 陈丹云 《应用化工》 CAS CSCD 2013年第2期245-247,252,共3页
在无相转移剂的条件下,以WO3/SiO2为催化剂,30%H2O2为氧化剂,催化氧化环己酮合成了己二酸。探讨了催化剂用量、H2O2用量、反应时间、酸性助剂和重复使用性等因素对收率的影响。结果表明,当环己酮0.1 mol,催化剂0.9 g,30%H2O250 mL,不加... 在无相转移剂的条件下,以WO3/SiO2为催化剂,30%H2O2为氧化剂,催化氧化环己酮合成了己二酸。探讨了催化剂用量、H2O2用量、反应时间、酸性助剂和重复使用性等因素对收率的影响。结果表明,当环己酮0.1 mol,催化剂0.9 g,30%H2O250 mL,不加酸性配体,回流反应5 h,己二酸的收率为67.2%。该催化剂还具有一定的重复使用性。 展开更多
关键词 WO3 SiO2 己二酸 环己酮 H2O2
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WO_3/SiO_2催化剂上2-丁烯与乙烯歧化制丙烯 认领 引用 被引量：8
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作者 赵秦峰 陈胜利 +2 位作者 高金森 徐春明 李东瑜 《燃料化学学报》 北大核心 2009年第5期567-572,共6页
采用浸渍法制备了WO3/SiO2催化剂,对其进行了UV-Vis DRS和NH3-TPD表征。将WO3/SiO2作为催化剂,以乙烯和2-丁烯为原料制备丙烯,考察了反应温度、质量空速等因素对歧化反应的影响。实验结果表明,催化剂的最佳WO3担载量为8%;以8%WO3/SiO2... 采用浸渍法制备了WO3/SiO2催化剂,对其进行了UV-Vis DRS和NH3-TPD表征。将WO3/SiO2作为催化剂,以乙烯和2-丁烯为原料制备丙烯,考察了反应温度、质量空速等因素对歧化反应的影响。实验结果表明,催化剂的最佳WO3担载量为8%;以8%WO3/SiO2为催化剂,在反应温度473 K^573 K、压力3.0 MPa、质量空速1.6 h-1下,2-丁烯的转化率可保持在80%以上,丙烯的选择性大于89.2%。经过140 h的稳定性实验,2-丁烯的转化率和丙烯的选择性略有下降,适当的提高反应温度(由473 K增加到513 K)可以恢复催化剂的活性。新鲜催化剂表面存在四面体、八面体六价钨物种和体相WO3,适当还原的W物种是歧化活性物种;W负载在催化剂表面引入了新的强酸中心,同时明显增加了总酸量。 展开更多
关键词 歧化 丙烯 WO3/SiO2 2-丁烯 催化剂
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