Can selling a piece of gold worth 2500 Saudi Riyals to cover the children's study expenses be considered a substitute for the annual obligatory zakat on gold?

Zakat (definition) is to be paid to the eight categories specified in the Holy Quran, and it is not permissible to pay it to other than these categories, while intending it as Zakat at the time of disbursement. The questioner paid the tuition fees for her children. If the education is an obligatory expense upon her as a mother, then it does not count as Zakat. However, if it is not an obligatory expense, it can be considered from the category of Zakat for a student of knowledge, under specific conditions, and with the intention of Zakat at the time of payment. It is permissible for a woman to pay her Zakat to her poor husband.