Salatul-Hajah and Salat Hifzul-Qur'an are not lawful
Question :
I have heard about Salatul-Hajah and Salat Hifzul- Qur'an - are these prayers or not?
Answer:
They are both incorrect; neither Salatul-Hajah nor Salat Hifzul-Qur'an are correct, because it is not possible to confirm such acts of worship except by some legal evidence and there is no legal evidence by which to make them lawful.
Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 2 Page 314