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In order to increase the activity of WS 2 /Al 2 O 3 hydrotreating catalysts promoted by Ni, an Al 2 O 3 –MgO support with 5mol% of MgO was prepared by sol–gel method and two catalyst series were obtained on this support by co-impregnation using pH 4 or 9 solutions. Support characteristics and W concentration effects were studied during impregnation and calcination...
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