LCO HYDROTREATING WITH Mo-Ni AND W-Ni SUPPORTED ON NANO- AND MICRO-SIZED ZEOLITE BETA

摘要

As a consequence of reductions in the yields of straight-run diesel fractions associated with the declining quality of crude oil worldwide, more low-quality feeds with higher sulfur and aromatics contents, such as light cycle oil (LCO) have to be blended into the streams to hydrotreaters to meet market demand for diesel fuel. Novel catalysts with higher activities need to be developed to convert such inferior feeds. It has been proved that hydrodesulfurization (HDS) and hydrodearomatization (HDA) activities can be significantly improved by increasing the acidity of catalysts [1]. Zeolite beta was believed to be one of the most suitable acidity components for use in hydrotreating LCO because of its appropriate pore structure and acidity [2]. However, its interconnected 12-membered ring channels, with pore openings of 0.55 nm x 0.55 nm and 0.76 nm x 0.64 nm, make it difficult for the large molecules present in oil fractions to diffuse to the inner surface where most of the reaction sites are located.