NH₃-TPD and Py-IR of the pristine and NH₄F etched ZSM-35 samples.

Sample	NH3-TPDa (mmol g−1)			Py-IRb (mmol g−1)		BAS in 8 MRc (mmol g−1)
	W	M	S	BAS	LAS
P	0.18	0.16	0.67	0.31	0.03	0.36
F5	0.08	0.22	0.74	0.29	0.02	0.45
F10	0.15	0.21	0.77	0.28	0.02	0.49
F20	0.12	0.18	0.65	0.34	0.04	0.31

^aThe acidic sites were tested by NH₃-TPD, and the number of weak acid sites (designated as W), moderate acid sites (M), and strong acid sites (S) was calculated based on the integrated area at the maximum desorption temperatures of approximately 250, 350, and 520 °C, respectively.

^bThe quantity of Brønsted acid sites (BAS) and Lewis acid sites (LAS) was measured by Py-IR, and their concentrations of BAS and LAS were determined using the equation of BAS = 1.88A_BR²/W, LAS = 1.42A_LR²/W, where A_B and A_L separately represent the integrated absorbance park area of BAS and LAS appeared at 1550 and 1450 cm⁻¹, R is the radius of catalyst wafer, and W is the weight of wafer.

^cThe amount of BAS in the 8-MR channels was computed by using the formula of [overall number of BAS (strong acid sites obtained by NH₃-TPD analysis) – the quantity of BAS in the 10-MR channels harvested by Py-IR tests].