The kinetics of solid‐state reactions toward consensus—Part I: Uncertainties, failures, and successes of conventional methods

Ortega, Abraham Barrero

doi:10.1002/kin.1028

Cited by 29 publications

(29 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The disagreement may be explained if we take into account that these authors obtained their data using conventional thermoanalytical methods (isothermal method), and it has been demonstrated [16][17][18][19][20] that under conventional experimental conditions a reaction is strongly modified by the experimental parameters. (i.e.…”

Section: Resultsmentioning

confidence: 95%

See 1 more Smart Citation

Carbothermal synthesis of titanium nitride (TiN): Kinetics and mechanism

Ortega

Roldán

Real

2005

Int J of Chemical Kinetics

Self Cite

View full text Add to dashboard Cite

Constant rate thermal analysis (CRTA) has been used for studying the kinetics of the carbothermal reduction of anatase in nitrogen. It is noteworthy to point out the ability of CRTA method for discriminating the kinetic law of solid-state reactions with considerably higher precision than conventional (TG, DTA, isothermal etc.) methods. The precise control of the reaction rate implies either direct or indirect control of both the partial pressure of CO generated in the reaction and the heat evolution rate, which allows to minimize the influence of heat and mass transfer phenomena.It has been shown that this synthesis is best described by a Johnson-Mehl-Avrami (with n = 2) kinetic model with an activation energy that fall in the range 162-165 kJ mol −1 . Finally the results reported here constitute the first attempt to use the new CRTA method to study the kinetics of the carbothermal synthesis of TiN. C 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: [566][567][568][569][570][571] 2005

show abstract

Section: Resultsmentioning

confidence: 95%

“…Therefore, a suitable method for controlling external parameters is needed, thus the controlled rate thermal analysis (CRTA) method [7] has been used in this kinetic study. CRTA is a temperature management method that maintains a constant reaction rate at a value previously selected by the user during the entire carbothermal reaction.…”

Section: Introductionmentioning

confidence: 99%

Carbothermal synthesis of titanium nitride (TiN): Kinetics and mechanism

Ortega

Roldán

Real

2005

Int J of Chemical Kinetics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Isoconversional methods allow researchers to distinguish between single‐step kinetics und multistage kinetics . Single‐step kinetics can be described well by Equation .…”

Section: Role Of Apparent Activation Energymentioning

confidence: 99%

Reduction of Iron Oxides with Hydrogen—A Review

Spreitzer

Schenk

2019

steel research int.

385

161

View full text Add to dashboard Cite

This review focuses on the reduction of iron oxides using hydrogen as a reducing agent. Due to increasing requirements from environmental issues, a change of process concepts in the iron and steel industry is necessary within the next few years. Currently, crude steel production is mainly based on fossil fuels, and emitting of the climate‐relevant gas carbon dioxide is integral. One opportunity to avoid or reduce greenhouse gas emissions is substituting hydrogen for carbon as an energy source and reducing agent. Hydrogen, produced via renewable energies, allows carbon‐free reduction and avoids forming harmful greenhouse gases during the reduction process. The thermodynamic and kinetic behaviors of reduction with hydrogen are summarized and discussed in this review. The effects of influencing parameters, such as temperature, type of iron oxide, grain size, etc. are shown and compared with the reduction behavior of iron oxides with carbon monoxide. Different methods to describe the kinetics of the reduction progress and the role of the apparent activation energy are shown and proofed regarding their plausibility.

show abstract

“…Because the partial pressure of the gases is proportional to the rate, the reaction proceeds at a constant overall rate previously selected by the user, under a constant partial pressure of evolved gas. Previous works have demonstrated the efficiency of CRTA to control the influence of experimental factors [18][19][20]. This method has been previously used to control the texture and the structure for many materials [21][22][23] through kinetic control of the thermal reaction of their precursors, and it has been reported that CRTA has higher sensitivity and resolution than the conventional methods.…”

Section: Introductionmentioning

confidence: 98%

Carbothermal synthesis of vanadium nitride: Kinetics and mechanism

Ortega

Roldán

Real

2006

Int J of Chemical Kinetics

Self Cite

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

The kinetics of solid‐state reactions toward consensus—Part I: Uncertainties, failures, and successes of conventional methods

Cited by 29 publications

References 37 publications

Carbothermal synthesis of titanium nitride (TiN): Kinetics and mechanism

Carbothermal synthesis of titanium nitride (TiN): Kinetics and mechanism

Reduction of Iron Oxides with Hydrogen—A Review

Carbothermal synthesis of vanadium nitride: Kinetics and mechanism

Contact Info

Product

Resources

About