Possibility protection of the cracking catalyst from heavy metals that contain in the cracking raw material by using Vietnam modified kaolin as actived matrix

Abstract

Modern fluid catalytic cracking (FCC) catalysts are composed of crystalline zeolite Y which is surrounded and held together by an amorphous silica/alumina matrix. Matrix contributes significantly to the overall performance of FCC catalysts. Catalyst matrix has many of the functions such as upgrading bottoms, reducing SOx emissions, and passivating catalyst poisons. The catalyst matrix plays an important role in trapping of the heavy metal contaminants (Ni, V) in the feedstock and inhibiting their adverse effects on both catalyst activity and selectivity. Vanadium, which deposits on catalyst particles in the riser as organometallic compounds, is converted to vanadium oxides in the regenerator. In the regenerator environment, vanadium can migrate to zeolite crystals and forms a low melting eutectic with the silica-alumina of the zeolite to destroy its crystal. Continued from [1, 3], this paper inlustrates the ability to anti-poision of the cracking catalyst by these heavy metals of Vietnam modified kaolin matrix.