Hydrogen consumption issue
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Why does burning char consume more hydrogen than burning kindling
There is a high amount of pyrolytic olefins, which leads to rapid reactions; there are also many aromatic hydrocarbons. The hydrogenation of conventional diesel is extremely difficult, so it requires a large amount of hydrogen
In terms of hydrogen consumption for National V diesel, catalyzed diesel requires more hydrogen than coked diesel, as catalyzed diesel has a higher content of polycyclic aromatic hydrocarbons, which increases its hydrogen consumption. The high nitrogen content in char has a certain impact on the acidic sites of hydrogenation catalysts.
Coking hydrocarbons contain more unsaturated hydrocarbons compared to catalytic hydrocarbons, and the amount of aromatics, especially polycyclic aromatics, is lower than that in catalytic hydrocarbons; therefore, under the same temperature conditions in hydrogenation reactions, coking hydrocarbons react more readily, resulting in higher hydrogen consumption.
Coker olefins have high sulfur, nitrogen, and oxygen contents, requiring large amounts of hydrogen for hydrorefining and saturation.