Catalytic Properties of Pd Modified Cu/SAPO-34 for NO_𝑥 Removal from Diesel Engine

Table 1

Physical properties of the Cu/SAPO-34 catalysts with different Cu contents.

Physical properties	Samples
	a	b	c	d	e	f
Cu/Si atom ratio of initial gel	0	0.025	0.05	0.1	0.2	0.4
Cu/Si atom ratio of Cu/SAPO-34	0	0.023	0.038	0.065	0.120	0.171
Relative crystallinity %	98.36	94.21	93.81	94.83	99.65	92.18
Grain size/µm	0.6–2.0	1.5–2.0	1.2–2.0	0.8–2.0	1.0–1.5	0.6–18