The Key Role of pH Value in the Synthesis of Titanate Nanotubes-Loaded Manganese Oxides as a Superior Catalyst for the Selective Catalytic Reduction of NO with NH₃

Table 2

Atomic concentration obtained with XPS.

Sample	Ti (%)	O (%)	Mn (%)	Na (%)	Mn/Ti	Na/Ti
Mn/TNTs-AC	9.92	73.57	9.59	6.92	0.97	0.70
Mn/TNTs-NE	21.36	64.14	4.24	10.26	0.20	0.48
Mn/TNTs-AL	5.58	63.56	10.94	19.92	1.96	3.57