Modulation of SAPO-34 Property with Activated Seeds and Its Enhanced Lifetime in Methanol to Olefins Reaction

doi:10.15541/jim20200059

Abstract

Abstract:

Solvent-free synthesis of zeolites has received extensive attention in recent years, because it is advantageous over conventional hydrothermal synthesis. Nevertheless, SAPO-34, a micropore zeolite, prepared by this method does not satisfy the catalytic lifetime requirements of the methanol-to-olefins (MTO) reaction. Herein, an improved solvent-free approach was developed to synthesize SAPO-34 catalysts with enhanced MTO reaction performance, in which acid-etched seed crystals were introduced to modulate the physico-chemical properties of the zeolite via crystallization kinetics regulation. The results indicated that the SAPO-34 samples prepared from seed-containing precursor gels show considerably higher crystallinity, larger surface area, but lower strong acid site density than the parent sample. In particular, the catalytic lifetime of the SAPO-34 catalyst prepared from activated seeds was remarkably prolonged to 480 min, which was significantly superior to that of the parent sample (40 min). The result confirmed the validity of the seeding approach for modifying the zeolite properties via the solvent-free synthesis and the potential of the approach in improving catalytic performance.

Key words: SAPO-34, methanol to olefins reaction, solvent-free synthesis, activated seeds

CLC Number:

TQ174

ZHANG Dongqiang, LU Huihui, SU Na, LI Guixian, JI Dong, ZHAO Xinhong. Modulation of SAPO-34 Property with Activated Seeds and Its Enhanced Lifetime in Methanol to Olefins Reaction[J]. Journal of Inorganic Materials, 2021, 36(1): 101-106.

Figures/Tables 9

References 43

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Sample	Textual properties					Acid amount ^c			Lifetime /min
Sample	S_BET/(m²·g^-1)	S_mic/(m²·g^-1)	S_ext/(m²·g^-1)	V_mic^a/(cm³·g^-1)	V_meso^b/(cm³·g^-1)	Weak	Medium and strong	Total	Lifetime /min
SP34	250	68	182	0.029	0.342	2.77	5.37	8.14	40
SP34-RS	316	291	24	0.136	0.068	0.86	2.05	2.91	100
SP34-AS_0.1	547	530	17	0.247	0.057	0.97	2.55	3.52	480
SP34-AS_0.01	552	532	20	0.249	0.056	1.42	3.41	4.83	300
SP34-AS_0.001	568	553	15	0.254	0.052	0.85	2.20	3.05	420
SP34-AS_0.0001	568	547	21	0.256	0.049	1.27	3.15	4.42	330

Sample	Textual properties					Acid amount ^c			Lifetime /min
Sample	S_BET/(m²·g^-1)	S_mic/(m²·g^-1)	S_ext/(m²·g^-1)	V_mic^a/(cm³·g^-1)	V_meso^b/(cm³·g^-1)	Weak	Medium and strong	Total	Lifetime /min
SP34	250	68	182	0.029	0.342	2.77	5.37	8.14	40
SP34-RS	316	291	24	0.136	0.068	0.86	2.05	2.91	100
SP34-AS_0.1	547	530	17	0.247	0.057	0.97	2.55	3.52	480
SP34-AS_0.01	552	532	20	0.249	0.056	1.42	3.41	4.83	300
SP34-AS_0.001	568	553	15	0.254	0.052	0.85	2.20	3.05	420
SP34-AS_0.0001	568	547	21	0.256	0.049	1.27	3.15	4.42	330