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Which catalyst is used in the manufacture of acrylonitrile from propylene-ammonia-air oxidation process?

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Which catalyst is used in the manufacture of acrylonitrile from propylene-ammonia-air oxidation process?

(a) Molybdenum-bismuth

(b) Molybdenum

(c) Silver

(d) Iron
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Correct choice is (a) Molybdenum-bismuth

The best explanation: Molybdenum-bismuth is used because it has excellent attrition resistance. Also, it provides more than an adsorptive surface in furnishing oxygen by surface reaction and transfer.
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