On the carbonitrothermic reduction of vanadium pentoxide

Tripathy, Prabhat K.; Sehra, J.C.; Kulkarni, Achyut Vasudeo

doi:10.1039/b003593i

Cited by 51 publications

(37 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 together with the pattern corresponding to the final product. In the literature [12,13], it has been shown that the reaction proceeded by the sequential reduction of (V 2 O 5 -V 2 O 4 -VO 2 -V 2 O 3 -VO 0.9 ) and concluded with the topotactic substitution of nitrogen for oxygen in VO 0.9 . In our experiment, we have detected VO 2 and V 2 O 3 as intermediates of the reaction, but it is not possible to see VO 0.9 because we detected only vanadium nitride.…”

Section: Synthesis and Characterization Of Vanadium Nitridementioning

confidence: 98%

Carbothermal synthesis of vanadium nitride: Kinetics and mechanism

Ortega

Roldán

Real

2006

Int J of Chemical Kinetics

View full text Add to dashboard Cite

Constant rate thermal analysis (CRTA) has been used for the first time to study the kinetics of the carbothermal reduction of V 2 O 5 in nitrogen to obtain vanadium nitride. It is noteworthy to point out that CRTA method allows both a good control of pressure in the sample surroundings and the use of reaction rates low enough to keep temperatures gradients at a negligible level to avoid any heat or mass transfer phenomena. This method allows one to control the texture and the structure of many materials through kinetic control of the thermal treatment of the precursors. The precise control of the external parameters of the reaction shows that CRTA is an attractive method for kinetic studies and leads to more reliable kinetic data. It has been shown that the carbothermal synthesis of vanadium nitride is best described by a three-dimensional diffusion kinetic model (the Jander equation) with an activation energy which falls in the range of 520-540 kJ/mol. C

show abstract

Section: Synthesis and Characterization Of Vanadium Nitridementioning

confidence: 98%

Carbothermal synthesis of vanadium nitride: Kinetics and mechanism

Ortega

Roldán

Real

2006

Int J of Chemical Kinetics

View full text Add to dashboard Cite

show abstract

“…Conventionally, VN is prepared by various high temperature methods, such as carbothermal reduction of vanadium pentoxide in N 2 at about 1500 • C [12], the direct reaction of metal vanadium with nitrogen at 1200 • C [8], and solid-state metathesis (SSM) routes at elevated temperature [13]. The conventional procedures for the synthesis of VN, however, are often plagued by high temperature (>1200 • C) and extremely long reaction time (several hours to even days) caused by slow diffusion rates in solids and usually involve many cumbersome steps [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of VN nanopowders by thermal nitridation of the precursor and their characterization

Zhao

Liu

Cao

et al. 2008

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Although an appropriate flow rate of nitrogen can promote the synthesis of VN, high reaction temperature and long reaction time were still required in the synthesis of VN with the flow of nitrogen in the tubular furnace [11,12]. Compared with a temperature of 1300-1500 °C required to prepare VN by the traditional CRN method, this study permitted a lower temperature and a shorter time by as much as several hundred degrees centigrade and several hours, respectively.…”

Section: Phase and Microstructure Analyses Of The Precursormentioning

confidence: 99%

“…The traditional procedure for the synthesis of VN is the process of carbothermal reduction-nitridation (CRN) of V 2 O 5 in N 2 at a high temperature of 1500 • C for 3 h with a N 2 flow rate of 13.3 × 10 −6 m 3 · s −1 [11], and at 1400 • C with a N 2 flow rate of 50 L·h −1 , using a microwave method [12]. The low melting point (670 • C) and the high saturation vapor pressure of V 2 O 5 will result in a volatile loss of V 2 O 5 near its melting point.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Vanadium Nitride Using a Thermally Processed Precursor with Coating Structure

Han

Zhang

Liu

et al. 2017

Metals

View full text Add to dashboard Cite

Abstract:A new effective method is proposed to prepare vanadium nitride (VN) via carbothermal reduction-nitridation (CRN) of the precursor, obtained by adding carbon black (C) to the stripping solution during the vanadium recovery from black shale. VN was successfully prepared at a low temperature of 1150 • C for only 1 h with a C/V 2 O 5 mass ratio of 0.30 in N 2 atmosphere, but a temperature of 1300-1500 • C is required for several hours in the traditional CRN method. The low synthesis temperature and short period for the preparation of VN was due to the vanadium-coated carbon structure of the precursor, which enlarged the contact area between reactants significantly and provided more homogeneous chemical composition. In addition, the simultaneous direct reduction and indirect reduction of the interphase caused by the coating structure obviously accelerated the reaction. The phase evolution of the precursor was as follows: (NH 4 The precursor converted to V 6 O 13 and VO 2 completely after being calcined at 550 • C, indicating that the pre-reduction of V 2 O 5 in the traditional CRN method can be omitted. This method combined the synthesis of VN with the vanadium extraction creatively, having the advantages of simple reaction conditions, low cost and short processing time.

show abstract

On the carbonitrothermic reduction of vanadium pentoxide

Cited by 51 publications

References 16 publications

Carbothermal synthesis of vanadium nitride: Kinetics and mechanism

Carbothermal synthesis of vanadium nitride: Kinetics and mechanism

Synthesis of VN nanopowders by thermal nitridation of the precursor and their characterization

Preparation of Vanadium Nitride Using a Thermally Processed Precursor with Coating Structure

Contact Info

Product

Resources

About