He devotes his time to the acquisition of knowledge中的acquisition为什么用名词形式to后面不是应该用动词吗?

貌似很应该用名词形式，不然用什么形式？
宾语。

devote
vt.
1. 将...奉献(给)[(+to sth./doing sth.)]
He devoted himself to writing.
他专心写作。
He was still devoted to the study of chemistry.
他仍专心致力于化学研究。
He has devoted his whole life to benefiting mankind.
他把一生都献给了造福人类的事业。
2. 把...专用(于)[(+to)]
acquisition 动词形式为 acquire
vt.
1. 取得,获得
The museum has just acquired a famous painting by Pablo Picasso.
该美术馆刚刚获得一幅毕加索的名画。
Gradually we acquired experience in how to do the work.
我们逐步获得了做这工作的经验。
2. 学到;养成
She has mastered English grammar and acquired a large vocabulary without the help of a teacher.
她在没有老师指导的情况下,掌握了英语语法,学到了大量词汇。
3. (雷达等)捕获(目标)

当to 和动词构成动词不定式时（即to do形式）,后面需跟动词原型.
这里的to 是介词,即devote to sth.,所以要跟名词.