Methanol Aromatization over Zn and Ce Modified Hierarchical ZSM-5 Catalysts: Effect of Ce as a Promoter

Table 2

Acidic properties of different catalysts.

Samples	Acidity by strength^a (mmol/g)
	SAS	MAS	WAS	Total^b
Z	0.208	0.333	0.364	0.905
HZ	0.114	0.129	0.264	0.507
0.6% Ce/HZ	0.118	0.152	0.236	0.506
2% Zn/HZ	0.079	0.141	0.270	0.490
2% Zn-0.6% Ce/HZ	0.091	0.165	0.285	0.541

^a The density of strong acid sites (SAS), medium acid sites (MAS), and weak acid sites (WAS) by deconvolution of the NH₃-TPD profile with Gaussian peaks (R₂ > 0.95);^b total represents the sum of strong, medium, and weak acid sites.