What catalyst is standard in catalytic cracking units_____________________?
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Answer: A. Silica-alumina
Explanation
Fluid catalytic cracking units rely on solid acid catalysts to break heavy gas oil molecules into lighter, high-octane products. Silica-alumina composites provide the necessary active acid sites and thermal stability for cracking hydrocarbon bonds. Consequently, silica-alumina is the classic and standard catalyst utilized in modern catalytic cracking units. Catalytic cracking is a cornerstone petroleum refining process that converts heavy petroleum fractions into gasoline and diesel. Solid catalysts are formulated into microscopic beads that circulate continuously between reactor and regenerator vessels. Acid cracking breaks carbon-carbon bonds via carbocation intermediates, producing branched paraffins and aromatic precursors.
Option B is silica gel, which acts primarily as a drying desiccant rather than an active catalytic cracking agent. Option C is vanadium pentoxide, a catalyst used in sulfuric acid manufacturing and oxidation reactions rather than cracking. Option D is nickel, which acts as a hydrogenation or dehydrogenation catalyst rather than the primary cracking catalyst.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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