期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到3,159篇文章
< 1 2 … 158 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
基于PI3K/Akt/FoxO1信号通路探讨参桂降糖方对2型糖尿病db/db小鼠糖脂代谢及其机制的影响 认领 引用
1
作者 王再冉 朱怡霏 +3 位作者 汤佳禾 秦灵灵 吴丽丽 刘铜华 《中国实验方剂学杂志》 CAS CSCD 北大核心 2026年第9期42-51,共10页
目的:基于磷脂酰肌醇3-激酶(PI3K)/蛋白激酶B(Akt)/叉头框蛋白O1(FoxO1)信号通路,探讨参桂降糖方对自发性2型糖尿病(T2DM)模型db/db小鼠的胰岛素抵抗(IR)及其糖脂代谢的影响,通过基础性实验,为该方临床应用奠定理论支撑。方法:该研究采... 目的:基于磷脂酰肌醇3-激酶(PI3K)/蛋白激酶B(Akt)/叉头框蛋白O1(FoxO1)信号通路,探讨参桂降糖方对自发性2型糖尿病(T2DM)模型db/db小鼠的胰岛素抵抗(IR)及其糖脂代谢的影响,通过基础性实验,为该方临床应用奠定理论支撑。方法:该研究采用随机对照设计,以30只符合纳入标准(空腹血糖>7.0 mmol·L-1且非同日随机血糖≥11.1 mmol·L-1)的自发性T2DM db/db小鼠为研究对象,按体质量、血糖进行区组分层后,将其随机分至模型组、二甲双胍组、参桂降糖方组,每组n=10,并将10只db/m小鼠为正常组,在为期5周的干预中,每周记录小鼠一般指标(包括一般状况、空腹血糖、体质量及进食量),并于第5周行口服葡萄糖耐量试验(OGTT)。5周后采集血清以检测糖脂代谢数据;对肝脏组织则进行分析:通过苏木素-伊红(HE)染色、过碘酸雪夫(PAS)和油红O染色观察组织病理学,通过蛋白质免疫印迹法(Western blot)与实时荧光定量聚合酶链式反应(Real-time PCR),定量分析PI3K/Akt/FoxO1信号通路相关蛋白与mRNA的表达。结果:一般情况观察:正常组小鼠整体状况健康,反应敏捷,皮毛顺滑且光泽,与正常组比较,模型组小鼠出现典型的多饮、多食、多尿症状,精神萎靡,皮毛粗糙,且进食量、初始体质量、肝质量及肝脏指数均显著升高(P<0.01),药物干预5周后,参桂降糖方组与二甲双胍组均未显著影响模型小鼠的进食量。与模型组比较,参桂降糖方组的肝质量及肝脏指数差异无统计学意义。血清生化指标检测:与正常组比较,模型组的空腹血糖、空腹胰岛素、IR指数、糖化血清蛋白及血脂水平均显著升高;药物干预后,与模型组比较,参桂降糖方组能显著降低模型小鼠的空腹血糖(P<0.01),OGTT各时间点均低于模型组,其中0 min血糖及血糖曲线下面积与模型组比较差异有统计学意义(P<0.05),且能明显降低空腹胰岛素水平、IR指数及糖化血清蛋白水平(P<0.05),对血脂、肝酶(天门冬氨酸氨基转移酶、丙氨酸氨基转移酶)、尿素氮水平有降低趋势,对肌酐水平有上升趋势,但差异无统计学意义。肝脏组织形态学检查:HE染色表明参桂降糖方可以改善糖尿病小鼠肝细胞的形态结构,减缓脂肪变性;肝脏PAS染色表明可以增加糖尿病小鼠肝糖原含量,促进肝脏糖原的合成;油红O染色表明可以减轻肝细胞内脂肪沉积。Western blot:与正常组比较,模型组PI3K、Akt、磷酸化(p)-Akt、p-FoxO1蛋白表达下降,FoxO1蛋白表达升高;与模型组比较,二甲双胍组、参桂降糖方组PI3K、Akt、p-Akt、p-FoxO1蛋白表达升高,FoxO1蛋白表达下降。Real-time PCR:PI3K、Akt、FoxO1 mRNA表达明显下调(P<0.05)。结论:参桂降糖方能改善db/db小鼠的IR及糖脂代谢紊乱;参桂降糖方能够改善db/db小鼠肝脏脂肪变性,促进肝糖原合成,减少脂质沉积;参桂降糖方改善IR的机制可能与PI3K/Akt/FoxO1信号通路有关。 展开更多
关键词 参桂降糖方 2型糖尿病(T2DM) 糖脂代谢 胰岛素抵抗(IR) 磷脂酰肌醇3-激酶/蛋白激酶B/叉头框蛋白O1(PI3K/Akt/FoxO1)信号通路
暂未订购 下载PDF
CaO含量对SiO2-Al2O3-CaO系轻质陶粒性能的影响及机理分析 认领 引用
2
作者 张祎欢 范海宏 +2 位作者 李俊杰 王玉浓 吴瑞 《新型建筑材料》 2026年第8期88-93,99,共6页
以煤矸石和垃圾焚烧飞灰等工业固废为主要原料,研究CaO含量(0.53%~33.61%)对SiO2-Al2O3-CaO系轻质陶粒物理性能及矿物组成的影响规律。结果表明,随着CaO含量增加,陶粒表观密度与单颗粒强度呈现减-增-减的非单调变化趋势,膨胀率与吸水率... 以煤矸石和垃圾焚烧飞灰等工业固废为主要原料,研究CaO含量(0.53%~33.61%)对SiO2-Al2O3-CaO系轻质陶粒物理性能及矿物组成的影响规律。结果表明,随着CaO含量增加,陶粒表观密度与单颗粒强度呈现减-增-减的非单调变化趋势,膨胀率与吸水率则呈相反规律。当CaO含量为11.56%、烧结温度1180℃时,可获得综合性能最优的陶粒:单颗粒强度1.75 MPa,表观密度471.43 kg/m3,吸水率3.85%。XRD与SEM-EDS分析表明,钙长石是陶粒膨胀过程的主导晶相,其含量随CaO含量的增加而升高。机理研究表明,适量CaO既可降低熔体黏度促进气体包裹,又能与硅铝组分反应形成钙长石骨架,二者协同作用实现陶粒的轻质化。 展开更多
关键词 SiO2-Al2O3-CaO系 陶粒 工业固废 钙长石 CaO含量 烧结机理
暂未订购 下载PDF
微纳米添加剂α-Al2O3在表面涂层领域的应用现状及市场前景 认领 引用
3
作者 伏建康 杨茂盏 +2 位作者 冉长荣 郭太雄 张千峰 《材料科学》 2025年第3期468-475,共8页
微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层... 微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层性能的潜力。微纳米α-Al2O3颗粒具有较大的比表面积和表面活性,能够增强涂层的机械性能,如硬度和耐磨性,同时提高涂层的耐腐蚀性和耐高温性能。微纳米α-Al2O3也是一种极优良的改性材料,其与有机硅烷、树脂等材料复合改性,既能大幅提升转化膜的应用效果,对其稳定性和耐候性也有较大的促进作用。在金属表面涂层、陶瓷涂层以及复合材料涂层中,微纳米α-Al2O3添加剂被广泛用于提高涂层的使用寿命和稳定性。此外,它在电子器件、航天航空和汽车工业等高技术领域也展现了广阔的应用前景。未来,随着表面技术的发展,微纳米α-Al2O3无铬钝化领域的市场应用将大幅增长,与其他功能性材料的协同作用和复合材料开发也将成为研究的重点。Micro-nano α-Al2O3 is an important functional material, because of its excellent hardness, wear resistance, corrosion resistance and high thermal stability, has been widely used in the field of surface coating. With the development of micro-nano technology, the application of micro-nano α-Al2O3 as an additive in various coating systems has been deeply studied, showing its potential to significantly improve coating properties. Micro-nano α-Al2O3 particles have a large specific surface area and surface activity, which can enhance the mechanical properties of the coating, such as hardness and wear resistance, while improving the corrosion resistance and high temperature resistance of the coating. Micro-nano α-Al2O3 is also an excellent modified material, and its composite modification with organosilane, resin and other materials can greatly improve the application effect of conversion film, and also has a greater role in promoting its stability and weather resistance. In metal surface coatings, ceramic coatings and composite coatings, micro-nano α-Al2O3 additives are widely used to improve the service life and stability of coatings. In addition, it also shows broad application prospects in high-tech fields such as electronic devices, aerospace and automotive industries. In the future, with the development of surface technology, the market application of micro-nano α-Al2O3 chromium-free passivation will grow significantly, and the synergy with other functional materials and the development of composite materials will also become the focus of research. 展开更多
关键词 纳米α-Al2O3 无铬钝化涂层 陶瓷膜 表面硬度 耐蚀性
暂未订购 下载PDF
Preparation and evaluation of α-Al2O3 supported lithium ion sieve membranes for Li^+ extraction 认领 引用 被引量：10
4
作者 Feng Xue Xiaoxian Zhang +3 位作者 Yue Niu Chenhao Yi Shengui Ju Weihong Xing 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第9期2312-2318,共7页
Spinel lithium manganese oxide ion-sieves have been considered the most promising adsorbents to extract Li^+ from brines and sea water.Here,we report a lithium ion-sieve which was successfully loaded onto tubular α-A... Spinel lithium manganese oxide ion-sieves have been considered the most promising adsorbents to extract Li^+ from brines and sea water.Here,we report a lithium ion-sieve which was successfully loaded onto tubular α-Al2 O3 ceramic substrates by dipping crystallization and post-calcination method.The lithium manganese oxide Li4 Mn5 O(12)was first synthesized onto tubular α-Al2 O3 ceramic substrates as the ion-sieve precursor(i.e.L-AA),and the corresponding lithium ion-sieve(i.e.H-AA) was obtained after acid pickling.The chemical and morphological properties of the ion-sieve were confirmed by X-ray diffraction(XRD) and scanning electron microscopy(SEM).Both L-AA and H-AA showed characteristic peaks of α-Al2 O3 and cubic phase Li4 Mn5 O(12) and the peaks representing cubic phase could still exist after pickling.The lithium manganese oxide Li4 Mn5 O(12) could be uniformly loaded not only on the surface of α-Al2 O3 ubstrates but also inside the pores.Moreover,we found that the equilibrium adsorption capacity of H-AA was 22.9 mg·g^-1.After 12 h adsorption,the adsorption balance was reached.After 5 cycles of adsorption,the adsorption capacity of H-AA was 60.88% of the initial adsorption capacity.The process of H-AA adsorption for Li^+correlated with pseudo-second order kinetic model and Langmuir model.Adsorption thermodynamic parameters regarding enthalpy(△N), Gibbs free energy(△G) and entropy(AS) were calculated.For the dynamic adsorptiondesorption process of H-AA,the H-AA exhibited excellent adsorption performance to Li^+ with the Li^+ dynamic adsorption capacity of 9.74 mg·g^-1 and the Mn^2+dissolution loss rate of 0.99%.After 3 dynamic adsorption-desorption cycles,80% of the initial dynamic adsorption capacity was still kept. 展开更多
关键词 Lithium α-Al2O3 tube Ion sieve Adsorption Li4Mn5O(12)
暂未订购 下载PDF
Synthesis of YAG∶Ce3+ Phosphor by Polyacrylamide Gel Method and Promoting Action of α-Al_2O_3 Seed Crystal on Phase Formation 认领 引用 被引量：8
5
作者 李永绣 李颖毅 +4 位作者 闵宇霖 吴燕利 程昌明 周雪珍 辜子英 《Journal of Rare Earths》 SCIE EI CAS 2005年第5期517-520,共4页
YAG： Ce^3 ＋ phosphor particles were prepared using polyacrylamide gel method. The structure evolution of powders during annealing process was followed by X-ray diffraction determination. It is found that some interm... YAG： Ce^3 ＋ phosphor particles were prepared using polyacrylamide gel method. The structure evolution of powders during annealing process was followed by X-ray diffraction determination. It is found that some intermediate phases, including θ-Al2O3, YAM and YAP, are formed when calcining polyacrylamide gel, however, the pure YAG phase can be formed directly when calcining polyacrylamide gel with α-Al2O3 as seed crystal. These facts show that the existence of α- Al2O3 seed crystal can block the formation of θ-Al2O3, YAM and YAP, and accelerate its reaction with Y2O3 to form YAG phase directly at lower temperature. The emission peak of prepared YAG ： Ce^3 ＋ phosphor is wide with maximum at 550 nm and the exitation band has two peaks, the major one is around at 460 nm, which matches the blue emission of GaN LED and is suitable for the assemble of white LED. Some fluxes can enhance the photoluminescence intensity of phosphor particles, that can be attributed both to the improvement of crystallization processes of YAG and to the stabilization of trivalence cerium ion in YAG：Ce^3 ＋. 展开更多
关键词 YAG ： Ce^3 ＋ phosphor polyacrylamide gel α-Al2O3 seed crystal phase formation rare earths
暂未订购 下载PDF
糠醛液相加氢用Mo改性Ni-B/TiO_2-Al_2O_3(S)非晶态合金催化剂 认领 引用 被引量：14
6
作者 石秋杰 雷经新 张宁 《物理化学学报》 SCIE CAS 北大核心 2007年第1期98-102,共5页
以溶胶-凝胶法制备复合载体TiO2-Al2O3(S)负载非晶态Ni-B合金用于催化糠醛液相加氢反应,并研究了Mo对催化剂的改性作用.采用ICP(等离子发射光谱)、DSC(差示扫描量热)、N2吸附、TPR(程序升温还原)和TPD(程序升温脱附)等技术对催化剂进行... 以溶胶-凝胶法制备复合载体TiO2-Al2O3(S)负载非晶态Ni-B合金用于催化糠醛液相加氢反应,并研究了Mo对催化剂的改性作用.采用ICP(等离子发射光谱)、DSC(差示扫描量热)、N2吸附、TPR(程序升温还原)和TPD(程序升温脱附)等技术对催化剂进行了表征.研究结果表明,与单一氧化铝载体相比,复合载体负载的Ni-B合金催化性能明显提高,这是由于在同样的制备条件下,复合载体负载的Ni-B中Ni含量更高,同时TiO2分散到了!-Al2O3的孔中,堵住了部分细孔,有利于产物糠醇扩散出来,防止深度加氢.Mo能提高Ni-B/TiO2-Al2O3(S)的热稳定性,增大Ni的负载量,使部分氧化态物种变得易于被还原,表面出现新的加氢活性中心,并增加化学吸附中心数,减弱吸氢强度,因而显著提高了Ni-B/TiO2-Al2O3(S)的活性;Mo添加使Ni-B/TiO2-Al2O3(S)的平均孔径及总孔容均增大,有利于产物糠醇扩散出来,还能使糠醇更易从催化剂的表面脱附,防止其深度加氢,因而提高了糠醇的选择性.当Mo含量为1.25%时,糠醛转化率、糠醇选择性都达到了100%. 展开更多
关键词 负载型非晶态合金 Ni-B/TiO2-Al2O3(S) 糠醛加氢制糠醇 Mo改性
暂未订购 下载PDF
Structures and oxygen storage capacities of CeO_2-ZrO_2-Al_2O_3 ternary oxides prepared by a green route:supercritical anti-solvent precipitation 认领 引用 被引量：9
7
作者 黄盼 姜浩锡 张敏华 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第6期524-528,共5页
CeO2-ZrO2-Al2O3 ternary oxides were successfully prepared by a green route of supercritical anti-solvent precipitation with supercritical CO2 as anti-solvent and methanol as solvent. The structures and oxygen storage ... CeO2-ZrO2-Al2O3 ternary oxides were successfully prepared by a green route of supercritical anti-solvent precipitation with supercritical CO2 as anti-solvent and methanol as solvent. The structures and oxygen storage capacities of these ternary oxides were characterized by XRD, Raman spectra and oxygen storage capacity measurements. It was found that Al3＋ and Zr4＋ inserted into CeO2 lattice, forming CeO2-ZrO2-Al2O3 solid solution. The concentration of aluminium isopropoxide in the solution affected the concentration of oxygen vacancy and the distortion of oxygen sublattice which were responsible for the oxygen storage capacity. The rapidest oxygen uptakeelease rate and maximum total oxygen storage capacity （122.0 mmolO2/molCeO2） were obtained with the aluminitun isopropoxide concentration at 0.2 wt.% in the solution. 展开更多
关键词 CeO2-ZrO2-Al2O3 solid solution supercritical anti-solvent precipitation oxygen storage capacity rare earths
暂未订购 下载PDF
Characterization and reactivity of γ-Al2O_(3 )supported Pd–Cu bimetallic nanocatalysts for the selective oxygenization of cyclopentene 认领 引用 被引量：5
8
作者 Wei-Wei Liu Yi-Si Feng +2 位作者 Guang-Yu Wang Wei-Wei Jiang Hua-Jian Xu 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第6期905-909,共5页
In this work, Pd–Cu/γ-Al2O3 is prepared by the impregnation method and investigated for selective oxygenization of cyclopentene to cyclopentanone. A series of bimetallic Pd–Cu/γ-Al2O3 nanocatalysts were prep... In this work, Pd–Cu/γ-Al2O3 is prepared by the impregnation method and investigated for selective oxygenization of cyclopentene to cyclopentanone. A series of bimetallic Pd–Cu/γ-Al2O3 nanocatalysts were prepared and the structures characterized by XRD, XPS and TEM. We determined that the obtained Pd–Cu/γ-Al2O3(molar ratio Pd:Cu = 5:1) was an efficient catalyst for the oxygenization of cyclopentene to cyclopentanone with 95% selectivity and 85% conversion(100 °C, 1 MPa initial O2 pressure, 7 h). 展开更多
关键词 Impregnation method Oxygenization Cyclopentanone Cyclopentene Pd–Cu/γ-Al2O3
暂未订购 下载PDF
Effect of Fe_2O_3 Loading Amount on Catalytic Properties of Monolithic Fe_2O_3/Ce0.67Zr0.33O_2-Al_2O_3 Catalyst for Methane Combustion 认领 引用 被引量：4
9
作者 刘志敏 陈耀强 +3 位作者 钟俊波 王健礼 闫生辉 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第5期585-589,共5页
Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal lo... Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal loading amount of Fe2O3 on Ce0.67Zr0.33 O2-Al2O3 in our experimental condition for catalytic combustion of methane was 8% （ mass fraction）. The prepared catalysts were characterized by BET, TPR, XRD analyses, and their catalytic activity was investigated after being calcined at 873 K and after being aged in water gas at 1273 K. When the loading amount of Fe203 was 8% （ mass fraction）, the catalyst held the highest activity, and the best temperature speciality and thermal stability. The complete-conversion temperature of methane for fresh and aged sample was 788 and 838 K, respectively. The range between the light-off temperature and the complete-conversion temperature was only 15 K. The characterization results of XRD indicated that Fe2O3 was well dispersed on the Ce0.67Zr0.33O2-Al2O3 matrix. The results of BET and TPR were in good harmony with the catalytic activity results. 展开更多
关键词 Ce0.67Zr0.33O2 -Al2O3, Fe2O3-based monolithic catalyst catalytic methane combustion catalytic properties
暂未订购 下载PDF
Plasma-catalytic degradation of tetracycline hydrochloride over Mn/γ-Al2O3 catalysts in a dielectric barrier discharge reactor 认领 引用 被引量：2
10
作者 Baowei WANG Chao WANG +2 位作者 Shumei YAO Yeping PENG Yan XU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第6期132-139,共8页
A coaxial dielectric barrier discharge (DBD) reactor was used for plasma-catalytic degradation of tetracycline hydrochloride over a series of Mn/γ-Al2O3 catalysts prepared by the incipient wetness impregnation method... A coaxial dielectric barrier discharge (DBD) reactor was used for plasma-catalytic degradation of tetracycline hydrochloride over a series of Mn/γ-Al2O3 catalysts prepared by the incipient wetness impregnation method.The combination of plasma and the Mn/γ-Al2O3 catalysts significantly enhanced the degradation efficiency of tetracycline hydrochloride compared to the plasma process alone,with the 10% Mn/γ-Al2O3 catalyst exhibiting the best tetracycline hydrochloride degradation efficiency.A maximum degradation efficiency of 99.3% can be achieved after 5 min oxidation and a discharge power of 1.3 W,with only 69.7% by a single plasma process.The highest energy yield of the plasma-catalytic process is 91.7 g kWh-1.Probable reaction mechanisms of the plasma-catalytic removal of tetracycline hydrochloride were also proposed. 展开更多
关键词 antibiotics dielectric barrier discharge Mn/γ-Al2O3 plasma-catalytic tetracycline hydrochloride
暂未订购 下载PDF
B_2O_3对Ag/TiO_2-Al2O_3吸附剂的柴油吸附脱硫性能影响(英文) 认领 引用 被引量：4
11
作者 李莉达 许承志 +1 位作者 郑美琴 陈晓晖 《燃料化学学报》 CSCD 北大核心 2015年第8期990-997,共8页
采用浸渍法制备了不同B2O3负载量（e.g.5%～20%（w））的Ag/Ti O2-B2O3-Al2O3吸附剂。以含硫量为245.36 mg（S）/L的商业柴油作为考察对象,常温常压下采用静态评价进行吸附脱硫性能研究。结果表明,B2O3改性后的Ag/Ti O2-Al2O3吸附剂的... 采用浸渍法制备了不同B2O3负载量（e.g.5%～20%（w））的Ag/Ti O2-B2O3-Al2O3吸附剂。以含硫量为245.36 mg（S）/L的商业柴油作为考察对象,常温常压下采用静态评价进行吸附脱硫性能研究。结果表明,B2O3改性后的Ag/Ti O2-Al2O3吸附剂的柴油吸附脱硫活性有了较大提高,当B2O3的负载量为15%时,吸附剂的吸附脱硫活性最高,2%Ag/4%Ti O2-15%B2O3-Al2O3（w）的饱和吸附硫容达到2.36 mg（S）/g吸附剂。这对于未经预处理的商业柴油而言,吸附脱硫活性已经达到较高水平。采用N2物理吸附、O2化学吸附、X射线衍射（XRD）、NH3程序升温脱附（NH3-TPD）、傅里叶红外光谱（FT-IR spectra）、^11B核磁共振（^11B-NMR）等表征手段对不同负载量B2O3改性Ag/Ti O2-Al2O3吸附剂的织构性质、晶相结构和表面酸性的影响进行研究。关联活性测试和表征结果发现,吸附剂的吸附脱硫活性主要与吸附剂的表面弱酸性有关,而B2O3改性在吸附剂表面引入了较多的四配位的BO4物种,能显著增加吸附剂表面弱酸性位点数量,提高吸附剂的吸附脱硫活性。 展开更多
关键词 B2O3 Ag基吸附剂 柴油 吸附脱硫 弱酸性位点
暂未订购 下载PDF
Characterization of CuO Species and Thermal Solid-Solid Interaction in CuO/CeO2-Al_2O3Catalyst by In-Situ XRD,Raman Spectroscopy and TPR 认领 引用 被引量：10
12
作者 He Mai Luo Mengfei Fang Ping 《Journal of Rare Earths》 SCIE EI CAS 2006年第2期188-192,共5页
Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD,Raman spectroscopy and H2-TPR techniques.For the catalyst... Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD,Raman spectroscopy and H2-TPR techniques.For the catalyst calcined at 300℃,two kinds of CuO species coexist on the surface,that is,highly dispersed and bulk CuO crystalline phase.Four kinds of CuO species are present for the catalyst calcined at 600℃,:(1)highly dispersed CuO,(2)bulk CuO on the surface,(3)bulk CuO in the internal layer of CeO2,and(4)CuAl2O4 formed from CuO-Al2O3 interaction.For the catalyst calcined at 800℃,C,besides very little highly dispersed and bulk CuO on the surface,most of the CuO has transferred into the internal layer of CeO2 and the mass of CuAl2O4 are increased.At 900℃,,all of CuO has diffused into the internal layer of CeO2 and formed CuAl2O4.The results show that the distribution of CuO species in the catalysts depends on the calcination temperature;the different CuO species can be effectively confirmed by in-situ XRD,Raman spectroscopy and H2-TPR techniques. 展开更多
关键词 CuO/CeO2-Al2O3 TPR solid-solid interaction rare earths
暂未订购 下载PDF
Study on Sulfation of CeO_2/γ-Al_2O_3 Sorbent in Simulated Flue Gas 认领 引用 被引量：2
13
作者 郁青春 张世超 +2 位作者 王新东 张杰 卢振明 《Journal of Rare Earths》 SCIE EI CAS 2007年第2期184-188,共5页
The sulfation of CeO2/γ-Al2O3 sorbent in simulated flue gas was studied. A series of CeO2/γ-Al2O3 sorbents with different CeO2 loadings were prepared by impregnation and characterized by X-ray diffraction. Thermogra... The sulfation of CeO2/γ-Al2O3 sorbent in simulated flue gas was studied. A series of CeO2/γ-Al2O3 sorbents with different CeO2 loadings were prepared by impregnation and characterized by X-ray diffraction. Thermogravimetric technique was used to study the sulfation of CeO2/γ-Al2O3 sorbents, mainly on the CeO2 loading, sulfation cycles, and intrinsic kinetics. The study revealed that monolayer coverage of CeO2 supported on γ-Al2O3 was 0. 125 g CeO2/g （γ-Al2O3）. Below monolayer coverage, CeO2 was highly dispersed on γ-Al2O3. The optimal CeO2 loading on sulfation was 0.03 g CeO2/g （γ-Al2O3）. CeO2/γ-Al2O3 sorbent was recyclable by controlling sulfation time. Intrinsic kineticd equation was R = 1. 1394×10^-4×exp （ - 1,508.39/T） mg·mg^-1·s^-1 Activation energy and reaction order were 12.54 kJ·mol^-1 and first order, respectively. 展开更多
关键词 CeO2/γ-Al2O3 SO2 intrinsic kinetics recyclable rare earths
暂未订购 下载PDF
Preparation and Characterization of γ-Al2O3 by Polyaluminum Chloride with High Al13 Content 认领 引用 被引量：2
14
作者 赵长伟 王孝年 +3 位作者 何劲松 栾兆坤 彭先佳 贾智萍 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第2期333-336,共4页
In this paper a polyaluminum chloride solution with high Al13 content was prepared and used as raw material for preparation ofγ-Al2O3.The texture and crystalline phase of the prepared alumina samples were characteriz... In this paper a polyaluminum chloride solution with high Al13 content was prepared and used as raw material for preparation ofγ-Al2O3.The texture and crystalline phase of the prepared alumina samples were characterized by energy dispersive X-ray spectroscopy(EDX) ,X-ray diffraction,transmission electron microscope(TEM) and nuclear magnetic resonance(NMR) analyses.The effects of alkaline solution and calcination temperature were investigated.The results showed that alkaline solution including NH3·H2O and NaOH had little effect on the alumina sample formation.The impurities of NH4Cl and NaCl in solution can be removed through repeated washing by EDX analysis.Calcination temperature had a significant effect on alumina crystal phase.The alumina sample can transform completely toγ-Al2O3 in the subsequent heating from 600°C to 800°C.It is very interesting that Al13 can be existed inγ-Al2O3 phase even after calcinations.The results indicate that polyaluminum chloride with high Al13 content is an effective material to prepareγ-Al2O3. 展开更多
关键词 γ-Al2O3 polyaluminum chloride preparation Al13
暂未订购 下载PDF
Interactions between vacancies and prismatic Σ3 grain boundary in α-Al2O3:First principles study 认领 引用 被引量：2
15
作者 王飞 赖文生 +2 位作者 李如松 何彬 黎素芬 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第6期371-375,共5页
Interactions between vacancies and Σ3 prismatic screw-rotation grain boundary in α-Al2O3 are investigated by the first principles projector-augmented wave method.It turns out that the vacancy formation energy decrea... Interactions between vacancies and Σ3 prismatic screw-rotation grain boundary in α-Al2O3 are investigated by the first principles projector-augmented wave method.It turns out that the vacancy formation energy decreases with reducing the distance between vacancy and grain boundary（GB） plane and reaches the minimum on the GB plane（at the atomic layer next to the GB） for an O（Al） vacancy.The O vacancy located on the GB plane can attract other vacancies nearby to form an O–O di-vacancy while the Al vacancy cannot.Moreover,the O–O di-vacancy can further attract other O vacancies to form a zigzag O vacancy chain on the GB plane,which may have an influence on the diffusion behavior of small atoms such as H and He along the GB plane of α-Al2O3. 展开更多
关键词 α-Al2O3 grain boundary（GB） vacancy interaction
暂未订购 下载PDF
Effect of Polyethylene Glycol on the Properties of γ-Al_2O_3 Formation by Polyaluminum Chloride 认领 引用 被引量：1
16
作者 赵长伟 王孝年 +2 位作者 何劲松 王园园 栾兆坤 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第5期1034-1038,共5页
A polyaluminium chloride solution with high Al 13 content self-prepared was used as material for preparing the spherical γ-Al 2 O 3 by the sol-gel and oil-drop method. Polyethylene glycol with different molecular mas... A polyaluminium chloride solution with high Al 13 content self-prepared was used as material for preparing the spherical γ-Al 2 O 3 by the sol-gel and oil-drop method. Polyethylene glycol with different molecular mass was used as surfactant to investigate the effect on property of γ-Al 2 O 3 . The physical property was characterized by 27 Al NMR (nuclear magnetic resonance) spectra, X-ray diffraction, FT-IR (Fourier transform infrared spectroscopy) and TG-DTA (thermogravimetric-differential thermal analysis). The results showed that surface area, pore volume and pore size of γ-Al 2 O 3 all increased with the increase of polyethylene glycol molecular mass in the experimental research range, and polyethylene glycol 10000 was the most suitable pore forming additive. γ-Al 2 O 3 with surface area of 339 m 2 ·g 1 , pore volume of 0.59 cm 3 ·g 1 and pore diameter of 6.9 nm were obtained at 450 °C. 展开更多
关键词 γ-Al 2 O 3 polyaluminum chloride preparation polyethylene glycol
暂未订购 下载PDF
NOx storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al2O3 catalyst using CH4 as reductant 认领 引用 被引量：1
17
作者 Tao ZHU Xing ZHANG +2 位作者 Nengjing YI Haibing LIU Zhenguo LI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第2期76-84,共9页
NOx storage and reduction(NSR)technology has been regarded as one of the most promising strategies for the removal of nitric oxides(NOx)from lean-burn engines,and the potential of the plasma catalysis method for NOx r... NOx storage and reduction(NSR)technology has been regarded as one of the most promising strategies for the removal of nitric oxides(NOx)from lean-burn engines,and the potential of the plasma catalysis method for NOx reduction has been confirmed in the past few decades.This work reports the NSR of nitric oxide(NO)by combining non-thermal plasma(NTP)and Co/Pt/Ba/γ-Al2O3(Co/PBA)catalyst using methane as a reductant.The experimental results reveal that the NOx conversion of NSR assisted by NTP is notably enhanced compared to the catalytic efficiency obtained from NSR in the range of 150°C–350°C,and NOx conversion of the 8%Co/PBA catalyst reaches 96.8%at 350°C.Oxygen(O2)has a significant effect on the removal of NOx,and the NOx conversion increases firstly and then decreases when the O2concentration ranges from 2%to 10%.Water vapor reduces the NOx storage capacity of Co/PBA catalysts on account of the competition for adsorption sites on the surface of Co/PBA catalysts.There is a negative correlation between sulfur dioxide(SO2)and NOx conversion in the NTP system,and the 8%Co/PBA catalyst exhibits higher NOx conversion compared to other catalysts,which shows that Co has a certain SO2resistance. 展开更多
关键词 non-thermal plasma NOx storage and reduction Co/Pt/Ba/γ-Al2O3 catalyst NOx conversion influence parameter
暂未订购 下载PDF
Preparation,Structures,Thermal Properties and Sintering Behaviors of B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 Glass 认领 引用 被引量：4
18
作者 丁阚俊杰 chen nan +1 位作者 杜国平 zhang aisheng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第6期1323-1328,共6页
B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with different Al_2O_3 contents（1mol%, 3mol%, 5mol%, and 7mol%） was prepared, and it was intended to be used as lead-free and low-melting glass sealants for solid oxide fuel cells.... B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with different Al_2O_3 contents（1mol%, 3mol%, 5mol%, and 7mol%） was prepared, and it was intended to be used as lead-free and low-melting glass sealants for solid oxide fuel cells. The effects of Al_2O_3 content on the structures, thermal properties, and sintering behaviors of the B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass were investigated in detail. The Al_2O_3 content largely influenced the structures and thermal properties of the glass. When the Al_2O_3 content 5mol%, the transition temperature of the glass decreased with the Al_2O_3 content, while the crystallization temperature increased with the Al_2O_3 content. However, higher Al_2O_3 content degraded the stability of the glass. The B_2O_3-SiO_2-ZnO-BaO-Al_2O_3 glass with 5 mol% Al_2O_3 content exhibits the optimal sintering densification characteristics and can be used as glass sealants for solid oxide fuel cells. 展开更多
关键词 B2O3-SiO2-ZnO-BaO-Al2O3 glass thermal properties sintering behavior densification crystallization
暂未订购 下载PDF
Preparation of ultrafine α-Al_2O_3 powders by catalytic sintering of ammonium aluminum carbonate hydroxide at low temperature 认领 引用 被引量：2
19
作者 肖劲 邓华 +2 位作者 万烨 李劼 刘业翔 《Journal of Central South University of Technology》 2006年第4期367-372,共6页
The precursor of ammonium aluminum carbonate hydroxide was synthesized by using aluminum sulfate（Al2（SO4）3） and ammonium carbonate（（NH4）2CO3）. The effects of α-Al2O3 seeds and mixture composed of α-Al2O3 and... The precursor of ammonium aluminum carbonate hydroxide was synthesized by using aluminum sulfate（Al2（SO4）3） and ammonium carbonate（（NH4）2CO3）. The effects of α-Al2O3 seeds and mixture composed of α-Al2O3 and ammonium nitrate, as well as multiplex catalysts （AT） on phase transformation of alumina in sintering process were investigated respectively. The results show that the α-Al2O3 seeds and the mixture of α-Al2O3 and ammonium nitrate can lower the phase transformation temperature of α-Al2O3 to different extents while the particles obtained agglomerate heavily. AT has great potential synergistic effects on the phase transformation of alumina and reduces the phase transformation temperature of α-Al2O3 and the trends of necking-formation between particles. Therefore the dispersion of powder particles is improved significantly. 展开更多
关键词 ammonium aluminum carbonate hydroxide phase transformation temperature α-Al2O3 agglomerα- tion
暂未订购 下载PDF
Synthesis of γ-Al_2O_3 nanoparticles by chemical precipitation method 认领 引用 被引量：1
20
作者 宋晓岚 曲鹏 +2 位作者 杨海平 何希 邱冠周 《Journal of Central South University of Technology》 2005年第5期536-541,共6页
Highly pure active γ-Al2O3 nanoparticles were synthesized from aluminum nitrate and ammonium carbonate with a little surfactant by chemical precipitation method. The factors affecting the synthesis process were studi... Highly pure active γ-Al2O3 nanoparticles were synthesized from aluminum nitrate and ammonium carbonate with a little surfactant by chemical precipitation method. The factors affecting the synthesis process were studied. The properties of γ-Al2O3 nanoparticles were characterized by DTA, XRD, BET, TEM, laser granularity analysis and impurity content analysis. The results show that the amorphous precursor AI（OH）3 sols are produced by using 0.1 mol/L Al（NO3）3·9H2O and 0.16 mol/L （NH4）2CO3·H2O reaction solutions, according to the volume ratio 1.33, adding 0.024%（volume fraction） surfactant PEG600, and reacting at 40℃, 1000 r/min stirring rate for 15min. Then, after stabilizing for 24 h, the precursors were extracted and filtrated by vacuum, washed thoroughly with deionized water and dehydrated ethanol, dried in vacuum at 80℃ for 8h, final calcined at 800℃ for 1h in the air, and high purity active γ-Al2O3 nanoparticles can be prepared with cubic in crystal system, OH^7-FD3M in space group, about 9 nm in crystal grain size, about 20 nm in particle size and uniform size distribution, 131.35 m^2/g in BET specific surface area, 7 - 11 nm in pore diameter, and not lower than 99.93% in purity. 展开更多
关键词 chemical precipitation method γ-Al2O3 nanoparticles characterization of properties
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 158 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈