chromium nitrate
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Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 361 ◽  
Author(s):  
Haili Wang ◽  
Wenfeng Han ◽  
Xiliang Li ◽  
Bing Liu ◽  
Haodong Tang ◽  
...  

Cr2O3 nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr2O3 and Cr2O3 prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr2O3 catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH3-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF3CH2CHF2, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF3CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr2O3 prepared by SCS method is as high as 6 mmol/h/g, which is about 1.5 times and 2 times higher than that of precipitated Cr2O3 and commercial Cr2O3, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr2O3, Cr2O3-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr2O3 prepared by SCS after reaction was not detected, indicating high resistance to sintering.


RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40243-40248 ◽  
Author(s):  
Zhiqin Cao ◽  
Chengyang Zuo

A Cr2O3/carbon nanosheet composite is directly synthesized by solution combustion synthesis using chromium nitrate as the chromium source and glucose as the carbon source. As anode materials for LIBs, the composite shows superior performance than pure Cr2O3.


2013 ◽  
Vol 114 (3) ◽  
pp. 1021-1027 ◽  
Author(s):  
P. Melnikov ◽  
V. A. Nascimento ◽  
I. V. Arkhangelsky ◽  
L. Z. Zanoni Consolo ◽  
L. C. S. de Oliveira

2009 ◽  
Vol 06 (11) ◽  
pp. 11-16
Author(s):  
Alexandre Andrade CERQUEIRA ◽  
Mônica Regina da Costa MARQUES

This study aimed to evaluate the ability to remove an ion Cr (III) in synthetic wastewater using a Brazilian clay. We evaluated the influence of the concentration of cation and anion effect on the ability of removal of chromium ions in effluent inorganic synthetic clay for montmorillonite (F-II) Fulmont provided by the industry. The clay was characterized by X-ray diffraction and chemical analysis. The tests were performed by removal of two different methods: in batch reactor and filtration in a column of clay. Tests were conducted at different pH `s (2-10), the mass of clay and solution of chromium nitrate (III) used in each test was 2g and 25 ml respectively. The efficiency of removal was determined by atomic absorption analysis of the supernatants. Preliminary results showed the efficiency of removal of chromium ions by the Brazilian clay. It was observed that the concentration of the solution, the experimental procedure and the presence of anions influenced the process of exchange, with the best results when used dilute solutions in the presence of nitrate ion and technology in filtration column resulting in removal of up to 100% of chromium (III).


2007 ◽  
Vol 136 (3) ◽  
pp. 323-330 ◽  
Author(s):  
M. Isabel Cabaço ◽  
M.I. de Barros Marques ◽  
A.M. Gaspar ◽  
M. Alves Marques ◽  
M. Margarida Costa

2007 ◽  
Vol 353-358 ◽  
pp. 2111-2114 ◽  
Author(s):  
Chun Cheng Zhu ◽  
Yan Hong ◽  
Jian Guang Zhang ◽  
Bai Bin Zhou

Cr2O3 nano-powders were successfully fabricated with using chromium nitrate and aqueous ammonia as starting material and urea as dispersant agent by sol-gel method. The formation of crystalline phase during heat treatment of dry gel was characterized by differential thermogravimetry (DTG) and X-ray diffraction (XRD) techniques and the temperature of calcination was determined as 400°C. Scanning electron microscopy (SEM) was utilized to observe the morphology of the as-fabricated Cr2O3 particles. The results showed that Cr2O3 particles are spherical or square with little agglomeration and a diameter of about 30 nm. The specific surface area of Cr2O3 particles was measured as 44.23 m2/g by Brunauer-Emmett-Teller (BET).


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