https://cosmosscholars.com/phms/index.php/jacst/issue/feedJ. of Advanced Catalysis Science and Technology2019-12-01T15:47:06-05:00Support Managersupport@cosmosscholars.comOpen Journal Systems<p style="text-align: justify;"><span style="font-size: 10pt; font-family: arial,helvetica,sans-serif; color: #000000;"><strong>Journal of Advanced Catalysis Science and Technology</strong> is a peer reviewed scientific journal that provide an international forum for scientists, engineers, researchers and academicians working in the field of catalytic science and technology. Premium articles reporting applied fundamental, experimental and computational research in aforementioned field are main theme of this journal.</span></p><p style="text-align: justify;"><span style="font-size: 10pt; font-family: arial,helvetica,sans-serif; color: #000000;">We welcome original research articles as well as review articles and short communication related to all aspects of catalysis.</span></p>https://cosmosscholars.com/phms/index.php/jacst/article/view/926Optimization of Redox Functionality Profiles of MoO3–V2O5/ TiO2 Composite Catalysts in Relation to Various Dispersion Patterns2019-12-01T15:47:06-05:00Salah A. Hassansupport@cosmosscholars.comHamdi A. Hassansupport@cosmosscholars.comAtef S. Darwishatef_mouharam@sci.asu.edu.eg<strong>Abstract:</strong> In the present study, a renewed approach was made to optimize the redox functionality of the well-known catalytic system MoO<sub>3</sub>-V<sub>2</sub>O<sub>5</sub>/ TiO<sub>2</sub> (anatase) in relation to various dispersion patterns. Several types of composite catalysts were considered: xV/T (x of V<sub>2</sub>O<sub>5</sub>= 2-12 wt %), 6Mo-xV/T co-impregnates, yMo-8V/T co-impregnates (y of MoO<sub>3 </sub>= 3-9 wt %), 6Mo-doped 8V/T (coat 1) and 8V-doped Mo/T (coat 2). The samples were characterized by adopting the XRD, FTIR, ESR, TEM, N<sub>2</sub> physisorption, high temperature H<sub>2</sub>-chemisorption and high temperature O<sub>2</sub>-chemisorptrion (HTOC), techniques. The redox reactivity was estimated in decomposition of H<sub>2</sub>O<sub>2</sub> in highly concentrated solution, permitting the formation of several peroxo V intermediates. In xV/T system, the constancy of TON with loading indicated the involvement of single vanadia site, not sensitive to the surface dispersion, but rather depended on the nature of coordination of H<sub>2</sub>O<sub>2</sub> molecules to VO<sub>x</sub> species. For different co-impregnates of Mo and V, the added molybdena, increasing the Lewis acidity, seemed to undergo a competitive interaction with titania to form non-reducible surface compound, with increased density of surface VOx patches. This was confirmed from H<sub>2</sub>-uptakes linked with highly stabilized V<sup>4+</sup> species. The sample of coat 1had the same dispersion and reactivity patterns of the other members of co-impregnated series, with formation of non-reducible surface compound through Mo-O-V bridges. In coat 2 sample, the VOx species existed on the top surface of supported MoO<sub>3</sub>/TiO<sub>2</sub> in a better dispersion state, with higher apparent density of surface patches, exhibiting comparable [A] and TON values to those of xV/T samples.Copyright (c)