Praise be to Allaah.
As far as we know, no specific du’aa’ has been narrated, so it is permissible for a person to recite any du’aa’ he likes and to pray for anything he wishes, such as asking for forgiveness of sins, to be admitted to Paradise, to be saved from Hell, to be given refuge from trials and tribulations, to be helped to understand the Qur’aan in the way that pleases Allaah, and to act upon it and memorize it, and so on. It was reported from Anas (may Allaah be pleased with him) that he used to gather his family and make du’aa’ when he completed the Qur’aan. However, nothing of this nature was reported from the Prophet (peace and blessings of Allaah be upon him), as far as I know. With regard to the du’aa’ attributed to Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him), I do not know whether this attribution is correct, but it is well-known among our shaykhs and others even though I have never seen it in any of his books.
And Allaah knows best.