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Which one of the following is an effective catalysts for converting gas oil?

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Which one of the following is an effective catalysts for converting gas oil?

(a) Molybdenum

(b) Aluminum

(c) Nickel

(d) All of the mentioned

I have been asked this question during an interview.

My question is taken from Industrial Processes-III in chapter Hydrogenation of Unit Processes

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The correct option is (a) Molybdenum

Easy explanation: Molybdenum and tungsten sulphides are effective catalysts for converting gas oil into lower-molecular-weight and more saturated products. Such catalysts are not poisoned by sulphur compounds in the oils.

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