Effect of Particle Size on the HDS Activity of Molybdenum Sulfide

Table 3

XPS parameters and assignments for MoS₃ and -PVP(0.5) before and after VGO HDS reaction.

Sample	Mo3d signal (eV)	Assignment	% (at.)	S2p signal (eV)	Assignment	% (at.)	S/Mo
MoS3	228.8–232.0	MoS3	79	161.5–162.6	S^2−	58	2.90
	230.1–233.5	or Mo2S5	11	162.68–163.86		41
	231.8–235.1	MoO3	10	168.27		1
-PVP(0.5)	228.9–232.1	MoS3	57	161.6–162.8	S^2−	45	2.97
Before reaction	230.1–233.4	or Mo2S5	38	162.9–164.1		50
	231.9–235.4	MoO3	5	168.2		5
-PVP(0.5)	229.5–232.7	MoS2	94	162.4–163.6	S^2−	82	1.88
After reaction	233.3–236.5	MoO3	6	163.5–164.8		13
				168.7		5

a: atomic% S/atomic% Mo, both, are determined using the sensitivity factor provided by the MultiPacK software.