The phrase "promoted gradually" is correct and usable in written English.
It refers to a process that progresses slowly over time, as in "She was gradually promoted from a junior-level position to a managerial role."
When each sub reaction is isolated, the transformation of olefins to corresponding alkanes is also thermodynamically promoted, but gradually becomes inhibited at higher temperatures.
After Kant was finally promoted, he gradually extended his repertoire of lectures to include anthropology (Kant's was the first such course in Germany and became very popular), rational theology, pedagogy, natural right, and even mineralogy and military fortifications.
"A lot of credit has to go to the management team because they identified Cook as the next leader and promoted him gradually," former England pace bowler Steve Harmison told BBC Sport.
They could promote Tsiskaridze in a way that Filin wasn't being promoted, so gradually Tsiskaridze accrued more and more soft power around himself, and that's when the scheming started.
Cells grown in osteoblast promoting media gradually changed their morphology from a rounded shape to a more compact, cobblestoned shape (Fig. 2A), as previously described (Capilla et al., 2011; Ytteborg et al., 2010d).
He continued his career as a pressman and was gradually promoted to a Foreman position.
Pushed development of the impoverished region and gradually promoted it as a tourism destination, establishing a nature preserve.
Having completed his training and gained his dispatcher's licence in the US, he was gradually promoted to head of operations at Tripoli airport.
With an increasing ratio of pluronic F-68 to nifedipine, the dissolution rate of nifedipine was gradually promoted and the extent of release was enhanced as well.
White was gradually promoted and served in the West Virginia National Guard's 2nd Battalion, 2nd West Virginia Infantry Regiment.
