Imam Muhammed al-Baqir (AS) has said:

"Any one who recites the Quran while standing in his Salat, Allah will write 100 good deeds (in his book) for every letter that is recited; and any one who recites the Quran while sitting in his Salat, Allah will write 50 good deeds (in his book) for every letter recited; and one who recites it (the Quran) in other than his Salat, Allah will write 10 good deeds for every letter that one recites."

Thawaab-ul-A'maal, Page 227