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Naphtha hydrotreating catalysts

Dealing with the more challenging streams. Criterion is a world-leading supplier of naphtha hydrotreating catalysts, the key to the effective removal of sulphur and nitrogen compounds from this valuable refinery stream. We supply about one-third by weight of all the naphtha hydrotreating catalyst purchased globally and about two-thirds of all the catalyst used by refiners operating higher-severity units.

Criterion works with customers to select the most appropriate catalysts and reactor loading strategies based on naphtha composition, the design of the individual process unit and the prevailing operating conditions and constraints. Years of research and development in this area combined with extensive commercial experience mean we have the capacity to devise catalyst solutions for even the most challenging naphtha hydrotreating applications.

Industry Benchmark catalysts
Criterion catalyst DN-200 was launched in the late 1990s and remains the naphtha hydrotreating catalyst of choice for many refiners. Specified by more than 100 different customers worldwide  DN-200 is a Ni–Mo alumina catalyst with excellent stability, which is essential for treating more challenging naphtha streams. It offers outstanding hydrodenitrogenation (HDN) and olefin saturation activity; its hydrodesulphurisation (HDS) activity is also very close to that of equivalent Criterion Co–Mo catalysts. The optimised pore size distribution and promoter composition prolong the life of the catalyst when treating either straight-run or cracked naphthas. Good results have been obtained with DN-200, even at relatively low hydrogen partial pressures.

DN-3531 catalyst was introduced in 2006 and is an alternative to DN-200. This catalyst is also a Ni–Mo alumina, but it is based on Criterion’s industry-leading ASCENT technology platform. An advanced alumina support, improved metals impregnation and greater dispersion of the active sites translate into superior activity, which can be used to raise throughput, process heavier feeds, extend cycle lengths or achieve target sulphur and nitrogen specifications at lower hydrogen partial pressures. DN-3531 is the ideal choice for tougher feeds, such as cracked and coker naphthas or naphtha derived from tar sands, which call for maximum HDN activity.

Both DN-200 and DN-3531 have excellent track records and can be supplied in the oxidic or presulphided form.

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