Author/Authors :
Mazloom، Golshan نويسنده Reaction Engineering Lab., Chemical Engineering Department, Iran University of Science and Technology, P.O. Box 16765-163, Tehran, Iran , , Alavi، Seyed Mehdi نويسنده Department of Plant Biotechnology, National Institute for Genetic Engineering and Biotechnology (NIGEB), P. O. Box: 14155-6343, Tehran, Iran. ,
Abstract :
Effects of water on the catalytic performances of MoVTeNbO catalyst in the oxidation of propane to acrylic acid have been investigated at different reaction temperatures and different steam contents. Obtained results show that both catalytic performances and catalyst structure are very sensitive to the presence of water vapor in the reaction feed. Presence of water induces some structural modifications: improvement the crystallinity, decreasing production of non-selective sites and enhanced presence of the orthorhombic (M1) phase leading to better acrylic acid selectivity. Moreover, the number as well as strength of the acid sites detected after reaction in water-present condition is lower than those of the used one in dry condition.
