Hierarchical ZSM-5 Zeolite: Preparation by Sequential Desilication-dealumination and Catalytic Performance in Methanol to Gasoline Reaction

doi:10.15541/jim20180034

Abstract

Abstract:

Hierarchical ZSM-5 zeolites were prepared by desilication and sequential desilication-dealumination using commercial ZSM-5 zeolite as raw material. The samples were characterized with XRD, FT-IR, SEM, TEM, and N₂ adsorption-desorption isotherms. The catalytic performance was investigated in methanol to gasoline (MTG) reaction. The results indicated that the hierarchical ZSM-5 zeolite catalysts with abundant intracrystalline meso- and macropores could be prepared by desilication or sequential desilication-dealumination treatment. Compared with commercial ZSM-5 zeolite, the hierarchical ZSM-5 zeolites had higher mesopore surface area, larger mesopore volume and higher accessibility index, but with less acid amount and lower acid strength. The results of catalytic performance evaluation showed that the gasoline yield and lifetime of hierarchical ZSM-5 zeolite catalysts were significantly enhanced after modification. Simultaneously, the yield of aromatic hydrocarbon was reduced. Compared with the sample prepared by the desilication treatment, physicochemical properties and catalytic performance of the hierarchical ZSM-5 zeolite prepared by sequential desilication-dealumination treatment were improved.

Key words: hierarchical ZSM-5 zeolite, desilication by alkali treatment, sequential desilication-dealumination, methanol to gasoline

CLC Number:

O611

WANG You-He, WANG Xiao-Dong, XU Jing-Wei, SUN Hong-Man, WU Cheng-Cheng, YAN Zi-Feng, JI Sheng-Fu. Hierarchical ZSM-5 Zeolite: Preparation by Sequential Desilication-dealumination and Catalytic Performance in Methanol to Gasoline Reaction[J]. Journal of Inorganic Materials, 2018, 33(11): 1193-1200.

Figures/Tables 10

References 17

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Samples	RC^a/%	S_BET^b/(m²•g^-1)	S_micro^c/(m²•g^-1)	S_meso^d/(m²•g^-1)	V_total^e/(cm³•g^-1)	V_micro^f/(cm³•g^-1)	V_meso^g/(cm³•g^-1)	SAR^h
C-ZSM-5	100	242	231	11	0.148	0.123	0.054	27.4
BT-ZSM-5	85.3	213	133	80	0.287	0.070	0.219	19.5
BAT-ZSM-5	85.6	305	160	145	0.423	0.085	0.345	20.1

Samples	RC^a/%	S_BET^b/(m²•g^-1)	S_micro^c/(m²•g^-1)	S_meso^d/(m²•g^-1)	V_total^e/(cm³•g^-1)	V_micro^f/(cm³•g^-1)	V_meso^g/(cm³•g^-1)	SAR^h
C-ZSM-5	100	242	231	11	0.148	0.123	0.054	27.4
BT-ZSM-5	85.3	213	133	80	0.287	0.070	0.219	19.5
BAT-ZSM-5	85.6	305	160	145	0.423	0.085	0.345	20.1

Sample	C_w/(μmol•g^-1)	C_s/(μmol•g^-1)	(C_w+C_s)/(μmol•g^-1)	C_s/C_w
C-ZSM-5	304.5	222.2	526.7	0.73
BT-ZSM-5	233.4	206.0	439.5	0.88
BAT-ZSM-5	237.9	214.0	451.9	0.90

Sample	C_w/(μmol•g^-1)	C_s/(μmol•g^-1)	(C_w+C_s)/(μmol•g^-1)	C_s/C_w
C-ZSM-5	304.5	222.2	526.7	0.73
BT-ZSM-5	233.4	206.0	439.5	0.88
BAT-ZSM-5	237.9	214.0	451.9	0.90

Sample	Pyridine adsorbed /(μmol•g^-1)				Collidine adsorbed/ (μmol•g^-1)
Sample	C_BP^a	C_LP^b	C_BP+C_LP	C_BP/C_LP	C_BC^c	ACI
C-ZSM-5	378.3	148.3	526.7	2.55	58.9	0.156
BT-ZSM-5	284.1	155.4	439.5	1.83	67.9	0.239
BAT-ZSM-5	306.4	145.5	451.9	2.11	126.3	0.412