Reductive conversion of hexavalent chromium in the preparation of ultra-fine chromia powder
作者： Yu-Lan Bai , Hong-Bin Xu , Yi Zhang , Zuo-Hu Li
DOI: 10.1016/J.JPCS.2006.07.018
关键词: Hydrogen 、 Analytical chemistry 、 Calcination 、 Reaction mechanism 、 Potassium chromate 、 Hexavalent chromium 、 Potassium 、 Chromia 、 Chromium 、 Chemistry 、 Nuclear chemistry
摘要: By reducing potassium chromate with hydrogen and then calcining the obtained intermediate at high temperature, ultra-fine chromia (Cr2O3) powder a mean diameter of 0.3 mu m was successfully prepared. Using scanning electron microscopy (SEM) XRD, products were characterized. Through XPS, TG-DSC, FT-IR, XRD chemical analysis, reaction mechanism explored. The results revealed that, from consists Cr(OH)(3)center dot nH(2)O, CrOOH, KCrO2 but composition changes reduction temperature time. Typically, content in ranges approximately 0.7% to 8% by weight chromium 50% 57% weight. It also found just presence oxygen can be completely removed final product. (c) 2006 Elsevier Ltd. All rights reserved.
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sci-hub.se 参考文章(23)
D.M. Follstaedt, R.M. Biefeld, D.S. Ginley, Nuclear resonance investigation of hydrogen mobility in chromous acid (α-HCrO2) Materials Research Bulletin. ,vol. 12, pp. 389- 392 ,(1977) , 10.1016/0025-5408(77)90056-3
R. M. Douglass, The crystal structure of HCrO2 Acta Crystallographica. ,vol. 10, pp. 423- 427 ,(1957) , 10.1107/S0365110X57001371
Shigeharu Kittaka, Tomoyuki Tahara, Thermal decomposition of chromium oxide hydroxide Journal of Colloid and Interface Science. ,vol. 112, pp. 252- 260 ,(1986) , 10.1016/0021-9797(86)90089-5
Shigeharu Kittaka, Tohru Morooka, Kohji Kitayama, Tetsuo Morimoto, Thermal decomposition of chromium oxide hydroxide: I. Effect of particle size and atmosphere Journal of Solid State Chemistry. ,vol. 58, pp. 187- 193 ,(1985) , 10.1016/0022-4596(85)90234-8
A Machet, A Galtayries, S Zanna, L Klein, V Maurice, P Jolivet, M Foucault, P Combrade, P Scott, P Marcus, XPS and STM study of the growth and structure of passive films in high temperature water on a nickel-base alloy Electrochimica Acta. ,vol. 49, pp. 3957- 3964 ,(2004) , 10.1016/J.ELECTACTA.2004.04.032
Manuel Ba obre-L pez, Carlos V zquez-V zquez, Jos Rivas, M Arturo L pez-Quintela, Magnetic properties of chromium (III) oxide nanoparticles Nanotechnology. ,vol. 14, pp. 318- 322 ,(2003) , 10.1088/0957-4484/14/2/342
D.L Hoang, A Dittmar, J Radnik, K.-W Brzezinka, K Witke, Redox behaviour of La-Cr compounds formed in CrOx/La2O3 mixed oxides and CrOx/La2O3/ZrO2 catalysts Applied Catalysis A-general. ,vol. 239, pp. 95- 110 ,(2003) , 10.1016/S0926-860X(02)00375-7
Z.C Zhong, R.H Cheng, Jocelyn Bosley, P.A Dowben, D.J Sellmyer, Fabrication of chromium oxide nanoparticles by laser-induced deposition from solution Applied Surface Science. ,vol. 181, pp. 196- 200 ,(2001) , 10.1016/S0169-4332(01)00346-4
T Tsuzuki, P.G McCormick, Synthesis of Cr2O3 nanoparticles by mechanochemical processing Acta Materialia. ,vol. 48, pp. 2795- 2801 ,(2000) , 10.1016/S1359-6454(00)00100-2
Sung Dae Yim, In-Sik Nam, Characteristics of chromium oxides supported on TiO2 and Al2O3 for the decomposition of perchloroethylene Journal of Catalysis. ,vol. 221, pp. 601- 611 ,(2004) , 10.1016/J.JCAT.2003.09.026