2014年hydrotalcite*专利
Catalytic Soot Oxidation Over Ce- and Cu-Doped Hydrotalcites-Derived Mesoporous Mixed Oxides
作者:Wang, ZP (Wang, Zhongpeng)[ 1,2 ] ; Wang, LG (Wang, Liguo)[ 1 ] ; He, F (He, Fang)[ 1 ] ; Jiang, Z (Jiang, Zheng)[ 3 ] ; Xiao, TC (Xiao, Tiancun)[ 2 ] ; Zhang, ZL (Zhang, Zhaoliang)[ 1 ]
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 卷:14 期:9
页:7087-7096
DOI:10.1166/jnn.2014.8944 出版年:SEP 2014
摘要
Ce- and Cu-doped hydrotalcites derived mixed oxides were prepared through co-precipitation and calcination method, and their catalytic activities for soot oxidation with O-2 and O-2/NO were investigated. The solids were characterized by XRD, TG-DTG, BET, H-2-TPR, in situ FTIR and TPO techniques. All the catalysts precursors showed the typical diffraction patterns of hydrotalcite-like materials having layered structure. The derived mixed oxides exhibited mesoporous properties with specific surface area of 45-160 m(2)/g. After both Ce and Cu incorporated, mixed crystalline phases of CuO (tenorite), CeO2 (fluorite) and MgAl2O4 (spinet) were formed. As a result, the NOx adsorption capacity of this catalyst was largely increased to 201 mu mol/g, meanwhile, it was also the most effective to convert NO into NO2 in the sorption process due to the enhanced reducibility. The in situ FTIR spectra revealed that NOx were stored mainly as chelating bidentate and monodentate nitrate. The interaction effect between Cu and Ce in the mixed oxide resulted in different NOx adsorption behavior. Compared with the non-catalyzed soot oxidation, soot conversion curves over the mixed oxides catalysts shift to low temperature in O-2. The presence of NO in the gas phase significantly enhanced the soot oxidation activity with ignition temperature decreased to about 320 degrees C, which is due to NO conversion to NO2 over the catalyst followed by the reaction of NO2 with soot. This explains the cooperative effect of Ce and Cu in the mixed oxide on soot oxidation with high activity and 100% selectivity to CO2 formation.
关键词
作者关键词:Cerium; Hydrotalcites; Mixed Oxides; Soot Oxidation; NOx Adsorption
KeyWords Plus:LAYERED DOUBLE HYDROXIDES; DIESEL SOOT; SIMULTANEOUS REMOVAL; NITROGEN-OXIDES; LOW-TEMPERATURE; NOX STORAGE; COMBUSTION; REDUCTION; MECHANISM; CO
作者信息
通讯作者地址: Wang, ZP (通讯作者)
地址:
[ 1 ] Univ Jinan, Sch Resources & Environm, Jinan 250022, Peoples R China [ 2 ] Univ Oxford, Inorgan Chem Lab, Oxford OX1 3QR, England
Univ Jinan, Sch Resources & Environm, Jinan 250022, Peoples R China.
类别 / 分类
研究方向:Chemistry; Science & Technology - Other Topics; Materials Science; Physics
Web of Science 类别:Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
文献信息
文献类型:Article 语种:English
入藏号:WOS:000335873900084
ISSN:1533-4880 电子 ISSN:1533-4899
其他信息
IDS 号:AH1IN
Web of Science 核心合集中的 \引用的参考文献\51 Web of Science 核心合集中的 \被引频次\
2013年hydrotalcite*专利
Engineering New Layered Solids from Exfoliated Inorganics: a Periodically Alternating Hydrotalcite - Montmorillonite Layered Hybrid
作者:Chalasani, R (Chalasani, Rajesh)[ 1 ] ; Gupta, A (Gupta, Amit)[ 1 ] ; Vasudevan, S (Vasudevan, Sukumaran)[ 1 ] SCIENTIFIC REPORTS 卷:3 文献号:3498
DOI:10.1038/srep03498 出版年:DEC 16 2013
摘要
Two-dimensional (2D) nanosheets obtained by exfoliating inorganic layered crystals have emerged as a new class of materials with unique attributes. One of the critical challenges is to develop robust and versatile methods for creating new nanostructures from these 2D-nanosheets. Here we report the delamination of layered materials that belonging to two different classes - the cationic clay, montmorillonite, and the anionic clay, hydrotalcite - by intercalation of appropriate ionic surfactants followed by dispersion in a non-polar solvent. The solids are delaminated to single layers of atomic thickness with the ionic surfactants remaining tethered to the inorganic and consequently the nanosheets are electrically neutral. We then show that when dispersions of the two solids are mixed the exfoliated sheets self-assemble as a new layered solid with periodically alternating hydrotalcite and montmorillonite layers. The procedure outlined here is easily extended to other layered solids for creating new superstructures from 2D-nanosheets by self-assembly.
关键词
KeyWords Plus:DOUBLE HYDROXIDES; LDH NANOSHEETS; INTERCALATION; DELAMINATION; SURFACTANT; NANOCOMPOSITES; CONFORMATION; ORGANOCLAYS; CRYSTALS; OXIDES
作者信息
通讯作者地址: Vasudevan, S (通讯作者)
地址:
[ 1 ] Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India.
电子邮件地址:svipc@ipc.iisc.ernet.in
类别 / 分类
研究方向:Science & Technology - Other Topics Web of Science 类别:Multidisciplinary Sciences
文献信息
文献类型:Article 语种:English
入藏号:WOS:000328570100001 ISSN:2045-2322
其他信息
IDS 号:273XR
Web of Science 核心合集中的 \引用的参考文献\45 Web of Science 核心合集中的 \被引频次\
2012hydrotalcite*专利
Hydrotalcite-Supported Platinum Nanoparticles Prepared by a Green Synthesis Method for Selective Oxidation of Glycerol in Water Using Molecular Oxygen
作者:Tongsakul, D (Tongsakul, Duangta)[ 1,2 ] ; Nishimura, S (Nishimura, Shun)[ 1 ] ; Thammacharoen, C (Thammacharoen, Chuchaat)[ 2 ] ; Ekgasit, S (Ekgasit, Sanong)[ 2 ] ; Ebitani, K (Ebitani, Kohki)[ 1 ] INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 卷:51 期:50
页:16182-16187 DOI:10.1021/ie3020507 出版年:DEC 19 2012
摘要
Hydrotalcite-supported platinum nanoparticles (Pt NPs/HT) prepared by the immobilization method with soluble starch as a reducing and a stabilizing agent were applied as catalysts for the selective oxidation of glycerol using atmospheric molecular oxygen as an oxidant in water. The Pt NPs/HT catalyst achieved a high selectivity (6896) toward glyceric acid (GA) in base-free aqueous solution. The catalyst was removed from the solution by simple filtration after the reaction and could be reused up to three times with a high selectivity (71% in third recycled).
关键词
KeyWords Plus:LIQUID-PHASE OXIDATION; FREE AQUEOUS-SOLUTION; GOLD CATALYSTS; BIMETALLIC CATALYSTS; SURFACE-PROPERTIES; PARTICLE-SIZE; CARBON; BASE; PD; AU
作者信息
通讯作者地址: Ebitani, K (通讯作者)
地址:
[ 1 ] Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi 9231292, Japan
[ 2 ] Chulalongkorn Univ, Sensor Res Unit, Dept Chem, Fac Sci, Bangkok 10330, Thailand Japan Adv Inst Sci & Technol, Sch Mat Sci, 1-1 Asahidai, Nomi 9231292, Japan.
电子邮件地址:ebitani@jaist.ac.jp
类别 / 分类
研究方向:Engineering
Web of Science 类别:Engineering, Chemical
文献信息
文献类型:Article 语种:English
入藏号:WOS:000312434600003 ISSN:0888-5885
其他信息
IDS 号:055RO
Web of Science 核心合集中的 \引用的参考文献\45 Web of Science 核心合集中的 \被引频次\6
作业
