Document Type : Research Paper

Authors

1 Departiment of Chemerty, Collage of Science, University of Anbar, Iraq

2 Departiment of Physics, Collage of Science, University of Anbar, Iraq

Abstract

The speed of formaldehyde decomposition has been studied using catalysts (vanadium nanoparticles, nano vanadium oxide with nano hydroxyapatite and vanadium oxide). The catalysts have been made with three different concentrations (100, 500 and 1000) ppm and at three different temperatures (25, 50 and 75) ° C. X-ray diffraction (XRD) and transmission electron microscope (TEM) images were used to study the structural and engineering properties of the prepared catalysts, which were nanostructured materials. The increase in the concentration of the catalysts and the temperature led to increasing the chemical reactions rate. However, it decreased the activation energy, which was calculated using the Arrhenius equation. The catalyst NV2O5 showed a better reaction rate compared to other prepared catalysts 100.1 x 〖10〗^(-3) and 112.5 x 〖10〗^(-3) ) for the catalysts such as nano vanadium oxide and nano vanadium oxide with nano hydroxyapatite, respectively
 

 

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Main Subjects

[1]    Khan S B.,Rahman.M.M., Marwani H M., Asiri .A. M., and Alamry K A., 2013,“An assessment of zinc oxide nanosheets as a selective adsorbent for cadmium,” Nanoscale Res. Lett., vol. 8, no. 1, p. 377.
[2]    Joshi.S S., and Ranade V V, 2016, ,,Industrial catalytic processes for fine and specialty chemicals,, Elsevier.
[3]    Pepla E., Besharat L K., Palaia G., Tenore G., and Migliau G.,2014,“Nano-hydroxyapatite and its applications in preventive, restorative and regenerative dentistry: a review of literature,” Ann. Stomatol. (Roma)., vol. 5, no. 3, p. 108.
[4]    Choi S., and Jeong Y.,2008, “The removal of heavy metals in aqueous solution by hydroxyapatite/cellulose composite,” Fibers Polym., vol. 9, no. 3, pp. 267–270.
[5]    Organization W H.,2010,“WHO guidelines for indoor air quality: selected pollutants,” .
[6]    Minsu L., Su.B., Tang Y., Jiang X., and Yu.A., 2017,“Recent advances in nanostructured vanadium oxides and composites for energy conversion,” Adv. Energy Mater., vol. 7, no. 23, p. 1700885.
[7]    Waldir  A. Jr., Cauê R., Edson R  L., and Valmor R. M.,2009, “Vanadium pentoxide nanostructures: an effective control of morphology and crystal structure in hydrothermal conditions,” Cryst. Growth Des., vol. 9, no. 8, pp. 3626–3631.
[8]    Bauer D., Ashton T  E., Brett D  J., Shearing  P  R., Matsumi  N., and J  A  D.,2019, “Mixed molybdenum and vanadium oxide nanoparticles with excellent high-power performance as Li-ion battery negative electrodes.,” Electrochim. Acta, vol. 322, p. 134695.
[9]    Danilevich  E V.,  Popova  G Y, Andrushkevich  T V, Kaichev V  V , Danilova  I G, Chesalov Y A, Rogov V A , VI, Bukhtiyarov, and VN, Parmon, “Selective oxidation of formaldehyde to formic acid over supported vanadia catalysts,” Appl. Catal. A Gen., vol. 475, pp. 98–108, 2014.
[10]  Kaichev  V V, Popova  G Y., Chesalov Y A., Saraev T V., Andrushkevich.A.A., and Bukhtiyarov V. I.,2016, “Active component of supported vanadium catalysts in the selective oxidation of methanol,” Kinet. Catal., vol. 57, no. 1, pp. 82–94.
[11]  Dwivedi R., Sharma P., Sisodiya A., and Batra M S., 2017, “A DFT-assisted mechanism for evolution of the ammoxidation of 2-chlorotoluene (2-CLT) to 2-chlorobenzonitrile (2-CLBN) over alumina-supported V2O5 catalyst prepared by a solution combustion method,” J. Catal., vol. 345, pp. 245–257.
[12]  Orlovskii V  P., Komlev V  S., and Barinov  S  M., 2002,“Hydroxyapatite and hydroxyapatite-based ceramics,” Inorg. Mater., vol. 38, no. 10, pp. 973–84.
[13]  Usharani S., and Rajendran V.,2018, “Size Controlled Synthesis and Characterization of V2O5/Al2O3 Nanocomposites,” Colloid Interface Sci. Commun., vol. 24, pp. 7–12.
[14]  Nalin S., Selvakumar B., and Periasamy P.,2017, “Simple Synthesis and Characterization of V2O5 Nanoparticles by Microwave Assisted Wet Chemical Method,” Int. J. Eng. Manuf. Sci., vol. 7, no. 2, pp. 411–417.
[15]  Muniz.F T L., Miranda M A R., Morilla Dos C. Santos., and Sasaki J M.,2016, “The Scherrer equation and the dynamical theory of X-ray diffraction,” Acta Crystallogr. Sect. A Found. Adv., vol. 72, no. 3, pp. 385–390.
[16]  Schmitz G., and Lente G.,2020, “Fundamental concepts in chemical kinetics,” ChemTexts, vol. 6, no. 1, p. 1.
[17]  Kusumaningtyas.R D., Ratrianti N, Purnamasar I., and Budiman A.,2017, “Kinetics study of Jatropha oil esterification with ethanol in the presence of tin (II) chloride catalyst for biodiesel production,” in AIP Conference Proceedings, p. 030086.
[18]  Kaur R.,Machiraju R., and Nigam K. D. P.,2008, “Kinetics studies of ketazine formation: Effect of temperature and catalyst concentration,” Can. J. Chem. Eng., vol. 86, no. 1, pp. 99–104.
[19]  Zeke A Piskulich.,Oluwaseun O  Mesele., and Ward H. Thompson.,2019, “Activation Energies and Beyond,” J. Phys. Chem. A, vol. 123, no. 33, pp. 7185–7194.
[20]  Kulczycki A., and Kajdas C.,2017, “A New Attempt to Better Understand Arrehnius Equation and its Activation Energy,” Tribol. Eng., p. 47.
[21]  Kajdas C., Kulczyck  A., Kurzydłowski K  J., and Molina  G. J.,2010, “Activation energy (Ea) of tribochemical and heterogeneous catalytic reactions” Mater. Sci., vol. 28, no. 2, pp. 523–533.