Catalyst Deactivation in Distillate Hydrotreating(Part 2). Raman Analysis of Carbon Deposited on Hydrotreating Catalyst for Vacuum Gas Oil.

Catalyst deactivation

The fundamentals of catalyst deactivation are presented in this review. The chemico-physical aspects concerning the various deactivation causes (i.e. poisoning, sintering, coking, solid-state transformation, masking, etc.) have been analyzed and discussed, along with the mathematical description of the deactivation phenomena. # 1999 Elsevier Science B.V. All rights

Effect of acidity and physical properties of nanozeolite catalyst on hydrocracking of vacuum gas oil

In this study, beta nanozeolite, ultra-stable Y zeolite (USY) and amorphous silica-alumina (ASA) were synthesized. These compounds were used as the support of hydrocracking catalyst. Ni-Mo/beta zeolite-ASA and Ni-Mo/USY zeolite-ASA catalysts were prepared by the impregnation method. The samples were characterized with X-Ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM)...

Advances in Catalyst Deactivation and Regeneration

A phenomenological model for selective growth of semiconducting single-walled carbon nanotubes based on catalyst deactivation.

A method for the selective semiconducting single-walled carbon nanotube (SWCNT) growth over a continuous range from 67% to 98%, within the diameter range of 0.8-1.2 nm, by the use of a "catalyst conditioning process" prior to growth is reported. Continuous control revealed an inverse relationship between the selectivity and the yield as evidenced by a 1000-times difference in yield between the ...

Dissolved hydrogen gas analysis in transformer oil using Pd catalyst decorated on ZnO nanorod array

A resistivity-type hydrogen (H2) sensor based on palladium (Pd)-decorated zinc oxide (ZnO) nanorod (NR) array has been developed to detect the dissolved H2 gas in the transformer oil. The Pd catalyst decorated on the ZnO NRs not only enhanced the H2 sensing properties at room temperature, but also played an important role to protect the ZnO NRs in liquid environment, which resulted long-term st...