Abstract
Abstract Two Ni-Mo/Al 2 O 3 catalysts, in fresh, commercially used, and toluene extracted states, were characterized by surface area, porosimetry, carbon content, 13 C NMR, and sulfur and nitrogen removal activity for gas oil hydrotreating. Used catalyst A contained 12.6 wt% carbon while used B contained 3.5 wt% carbon. NMR data showed that 1/8 of the carbon on A was extractable aliphatic, while the remainder of carbon on A and all on B was aromatic and non-extractable. HDS activity decreased proportionally the same in used catalysts A and B ; however, HDN activity was more severely affected by the higher carbon content of catalyst A . Extraction recovered about 40% of the HDS activity loss of A and B and half the HDN activity of B ; extraction caused little improvement in HDN activity on A . These results, combined with porosimetry data, suggest that both HDS and HDN activities decline primarily by loss of active sites; additionally, HDN declines by diffusion resistance.
Published Version
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