Author(s)

H. Al-Kandari¹, S. Al-Kandari², A. M. Mohamed², F. Al-Kharafi², A. Katrib^2*

¹College of Health Sciences, PAAET, Faiha, Kuwait.
²Chemistry Department, Kuwait University, Safat, Kuwait.

Partially reduced molybdenum trioxide deposited on titania under hydrogen at 673 K for 12 h ena- bled to convert several surface atomic layers to the catalytically active bifunctional (metal-acid) MoO_2-x(OH)_y/TiO₂ (MoTi) structure. The formed metallic function is the result of π bonding between adjacent Mo-Mo atoms placed along the C-axis of the rutile structure of MoO₂. Delocalization of these π electrons produces a wire like atomic metal. This resembles in a way, the small Pt particles deposited on a support. Moreover, dissociated hydrogen atoms are bonded to sample surface oxygen to produce Brønsted acid Mo-OH function(s). These metal-acidic properties have been tested for several catalytic reactions requiring one or bothcatalytic functions. In this order, 2-propanol species could be considered as a model test of the acidic function via dehydration of the molecule to propene, while hydrogenation of the produced propene to propane is performed by the metallic function. Moreover, hydrogenation of 2-propanol to acetone, requires relatively strong metallic function. In this order, addition of small amount of alkali metal like rubidium will suppress the acidic function in MoO_2-x(OH)_y/TiO₂ and enhance the metallic function strength. The performance of the metallic function alone in this case will be evaluated. Titanium dioxide is employed in this catalytic system as a support. It does not have any catalytic effect. Association of XPS-UPS, ISS sur-face techniques with catalytic performances of this catalytic MoTi system will be presented.

MoO_2-x(OH)_y Catalyst, XPS, Acid-Metal Functions, Hydrogenation, 2-Propanol

Al-Kandari, H. , Al-Kandari, S. , Mohamed, A. , Al-Kharafi, F. and Katrib, A. (2015) Catalytic Hydrogenation Reactions on Molybdenum Oxide. Modern Research in Catalysis, 4, 36-42. doi: 10.4236/mrc.2015.41005.