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| 1 | Rare earth metal doped CeO_2-based catalytic materials for diesel soot oxidation at lower temperatures显示文摘In this work, the influence of trivalent rare-earth dopants(Sm and La) on the structure-activity properties of CeO2 was thoroughly studied for diesel soot oxidation. For this, an optimized 40% of Sm and La was incorporated into the CeO2 using a facile coprecipitation method from ultra-high dilute aqueous solutions. A systematic physicochemical characterization was carried out using X-ray diffraction(XRD), transmission electron microscopy(TEM), Brumauer-Emmett-teller method(BET) surface area, X-ray photoelectron spectroscopy(XPS), Raman, and H2-temperature programmed reduction(TPR) techniques. The soot oxidation efficiency of the catalysts was investigated using a thermogravimetric method. The XRD results suggested the formation of nanocrystalline single phase CeO2-Sm2O3 and CeO2-La2O3 solid solutions. The Sm- and La-doped CeO2 materials exhibited smaller crystallite size and higher BET surface area compared with the pure CeO2. Owing to the difference in the oxidation states of the dopants(Sm3+ and La3+) and the Ce4+, a number of oxygen vacancies were generated in CeO2-Sm2O3 and CeO2-La2O3 samples. The H2-TPR studies evidenced the improved reducible nature of the CeO2-Sm2O3 and CeO2-La2O3 samples compared with the CeO2. It was found that the addition of Sm and La to the CeO2 outstandingly enhanced its catalytic efficiency for the oxidation of diesel soot. The observed 50% soot conversion temperatures for the CeO2-Sm2O3, CeO2-La2O3 and CeO2 were ~790, 843 and 864 K(loose contact), respectively, and similar activity order was also found under the tight contact condition. The high soot oxidation efficacy of the CeO2-Sm2O3 sample was attributed to numerous catalytically favourable properties, like smaller crystallite size, larger surface area, abundant oxygen vacancies, and superior reducible nature. | A.Rangaswamy Putla Sudarsanam Benjaram M.Reddy | 2015 | Journal of Rare Earths2015，33，11： | 21 |
| 2 | 非负载和氧化铝负载的纳米CeO_2-ZrO_2和CeO_2-Te_2O_3固溶体催化CO氧化(英文)显示文摘Ceria-zirconia(CZ)and ceria-terbia(CT)and alumina-supported ceria-zirconia(CZA)and ceria-terbia(CTA)solid solutions were synthesized by coprecipitation and deposition precipitation methods,respectively.Structural characteristics and catalytic activity of the synthesized samples have been investigated using X-ray diffraction(XRD),high resolution transmission electron microscopy(HRTEM),X-ray photoelectron spectroscopy(XPS),Raman spectroscopy(RS),and Brunauer-Emmett-Teller(BET)surface area measurements.To evaluate the catalytic properties,total oxygen storage capacity and CO oxidation activity measurements were carried out.The XRD analyses revealed the formation of Ce0.75Zr0.25O2 phase for CZ and Ce0.5Zr0.5O2 and Ce0.6Zr0.4O2 phases for CZA samples,respectively.While the formation of only Ce0.8Tb0.2O2-δphase was noted for both CT and CTA samples.All the supported and unsupported samples adopted a fluorite-type structure and exhibited cell parameters with respect to Vegard's rule.The HRTEM results indicated well-dispersed particles of the size around 5 nm.The RS measurements suggested the presence of oxygen vacancies due to defective structure formation.The XPS studies revealed the presence of cerium in both Ce 4+ and Ce 3+ oxidation states in different proportions.It was found that CO oxidation for CTA occurs at very much lower temperature than CT,CZ,and CZA samples.Details of these findings by correlating with the structural characterization studies are consolidated. | M.Reddy BENJARAM Thrimurthulu GODE Lakshmi KATTA | 2011 | 催化学报2011，32，5： | 3 |
| 3 | Sulfated zirconia as an efficient catalyst for organic synthesis and transformation reactions 显示文摘 | Benjaram M Reddy Pavani M Sreekanth Pandian Lakshmanan | 2005 | Journal of Molecular Catalysis A : Chemical2005，237，12： | 1 |
| 4 | X-ray photoelectron spectroscopy study of V2O5 dispersion on a nanosized A1203-TiO2 mixed oxide 显示文摘 | Benjaram M R Biswajit C | 2001 | Langmuir2001，17，： | 1 |
| 5 | An XPS study of dispersion and chemical state of MoO3 on A12Os-TiO2 binary oxide support显示文摘 | Benjaram M R Biswajit C Ettireddy P R | 2001 | Applied Catalysis A: General2001，213，： | 1 |
| 6 | Single step synthesis of nanosized CeO2–M x O y mixed oxides (M x O y ?=?SiO2, TiO2, ZrO2, and Al2O3) by microwave induced solution combustion synthesis: characterization and CO oxidation显示文摘 | Benjaram M. Reddy Gunugunuri K. Reddy Ibram Ganesh Jose M. F. Ferreira | 2009 | Journal of Materials Science2009，，11： | 1 |
| 7 | Synthesis, characterization and activity study of SO4^2-/Ce,Zr1-xO2 solid superacid catalyst显示文摘 | Benjaram M Reddy Pavani M Sreekanth Pandian Lakshm- anan | 2006 | Journal of Molecular Catalysis A: Chemical2006，244，： | 1 |
| 8 | Sulfated zirconia as an efficient catalyst for organ- ic synthesis and transformation reactions 显示文摘 | Benjaram M Reddy Pavani M Sreekanth Pandian Laksh- manan | 2005 | Journal of Molecular Catalysis A: Chemical2005，237，12： | 1 |
| 9 | Aniline synthesis from cyclohexanol and ammonia over mixed oxide catalysts 显示文摘 | Basude M Ibram G Benjaram M R | 1998 | Journal of Molecular Catalysis A : Chemical1998，129，： | 1 |
| 10 | Organic Syntheses and Transformations Catalyzed by Sulfated Zirconia显示文摘 | Benjaram M Reddy Meghshyam K Patil | 2009 | Chem Rev2009，109，6： | 1 |
| 11 | Surface characterization of sulfate,molybdate,and tungstate promoted TiO2-ZrO2 solid acid catalysts by XPS and other techniques显示文摘 | Benjaram M Reddy Pavani M Sreekanth Yusuke Yamada | 2002 | Applied Catalysis A:General2002，，228： | 1 |
| 12 | Structural, characterization and catalytic activity of nanosized CexM1-xO2 (M= Zr and Hf) mixed oxides显示文摘 | Benjaram M R Pankaj B Pranjal S | 2008 | J Phys Chem C2008，112，11： | 1 |
| 13 | Effect of ceria on the structure and catalytic activity of V2O5/TiO2-ZrO2 foroxide hydrogenation of ethylbenzene to styrene utilizing CO2 as soft oxidant显示文摘 | Rao Komateedi N Reddy Benjaram M Abhishek B | 2009 | App catal B2009，27，9： | 1 |
| 14 | Surface characterization of sulfate,molybdate,and tungstate promoted TiO2-ZrO2 solid acid catalysts by XPS and other techniques,reddy显示文摘 | BENJARAM M | 2002 | Appl Catal A:General2002，228，12： | 1 |
| 15 | Design of stable and reactive vanadium oxide catalysts supported on binary oxides显示文摘 | Benjaram M R Ibram G Biswajit C | | 0，，1： | 1 |
| 16 | Surface characterization and catalytic activity of sulfate-,molybdate and tungstate-promoted Al2O3-ZrO2 solid acid catalysts显示文摘 | BENJARAM M REDDYA | 2005 | J Mol Catal A:Chemical2005，227，： | 1 |
| 17 | Effect of Ceria on the Structure and CatalyticActivity of V2O5/TiO2-ZrO2 for Oxidehydrogena-tion of Ethylbenzene to Styrene Utilizing CO2 asSoft Oxidant显示文摘 | Rao Komateedi N Reddy Benjaram M Abhishek B | 2009 | Applied Catalysis B:Environmen-tal2009，91，34： | 1 |
| 18 | Modified zirconia solid acid catalysts for organic synthesis and transformations显示文摘 | BENJARAM M R PAVANI M S VANGALA R R | 2005 | J Mol Catal A: Chem2005，225，： | 1 |
| 19 | Ammoxidation of 3- picoline to nicotinonitrile on silica-supported VPO catalyst 显示文摘 | Benjaram M Reddy Basude Manohar | 1992 | Chemistry Industry1992，，2： | 1 |
| 20 | Surface characterization of sulfate, molybdate, and mngstate promoted TiO2-ZrO2 solid acid catalysts by XPS and other techniques显示文摘 | Reddy Benjaram M Sreekanth Pavani M Yamada Yusuke | 2002 | Applied Catalysis A: General2002，228，12： | 1 |
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