Russian translation: катализаторы слоев верхней ранжированной загрузки
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English to Russian translations [PRO] Tech/Engineering - Petroleum Eng/Sci / нефтехимия
English term or phrase:graded catalysts
For feeds that have a significant aromatics and/or nitrogen content, a nickel-moly (Ni/Mo) or nickel promoted cobalt-moly (Co/Mo) catalyst will be used, along with an appropriate selection of ***graded catalysts*** in the top of the bed to mitigate reactor pressure build-up.