Investigation of Influential Parameters in Deep Oxidative Desulfurization of Dibenzothiophene with Hydrogen Peroxide and Formic Acid

Table 2

The amount and levels of the variables in experimental design.

Variable	Unit	Low level; (−1)	Center point; (0)	High level; (+1)
H2O2/S (𝑋1)	—	2	15	28
Time (𝑋2)	min	50	100	150
Facid/S (𝑋3)	—	2	20	38