Catalystic Performance of HZSM-5 Zeolite Treated by CH3COONa

doi:10.15541/jim20180336

Abstract

Abstract:

HZSM-5 zeolites were treated by CH₃COONa solution with different concentrations and conventional alkali (NaOH or Na₂CO₃) solution. Then, Pt was loaded on HZSM-5 zeolites before and after the treatment to synthesize Pt/HZSM-5 catalysts for propane dehydrogenation reaction. HZSM-5 zeolites were characterized by XRD, XRF, SEM, BET, NH₃-TPD, and H₂chemisorption. The effect of CH₃COONa solution with different concentrations and conventional alkali solution on crystal structure, surface morphology, pore structure, surface acidity, and propane dehydrogenation performance of HZSM-5 zeolites were investigated. The results showed that CH₃COONa solution modified HZSM-5 zeolites by alkali. Compared with conventional alkali solution, the treatment of CH₃COONa solution for HZSM-5 zeolites could more effectively introduce and better controllably the mesoporous structure with less influence on the crystal structure and surface morphology. With increase of the concentration of CH₃COONa solution, the initial propane conversion and the propene selectivity in propane dehydrogenation firstly increased and then decreased. The catalyst treated by 4.0 mol/L CH₃COONa solution exhibited the highest propane initial conversion and propene selectivity, which were 34.5% and 98.9%, respectively.

Key words: HZSM-5, alkali treatment, propane dehydrogenation

CLC Number:

TQ630

Guo-Hao XU, Jin-Peng YU, Hua-Sheng XU, Chun-Cheng LI, Jin-Hua HUANG, Peng-Fei WANG. Catalystic Performance of HZSM-5 Zeolite Treated by CH₃COONa[J]. Journal of Inorganic Materials, 2019, 34(5): 546-552.

Figures/Tables 12

References 17

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Sample	Relative crystallinity/%	n(SiO₂) /n(Al₂O₃)
HZSM-5(0)	100	100
HZSM-5(CH₃COONa, 2.0)	99	94
HZSM-5(CH₃COONa, 4.0)	97	90
HZSM-5(CH₃COONa, 6.0)	85	82
HZSM-5(Na₂CO₃, 2.0)	62	74
HZSM-5(NaOH, 1.0)	24	63

Sample	Relative crystallinity/%	n(SiO₂) /n(Al₂O₃)
HZSM-5(0)	100	100
HZSM-5(CH₃COONa, 2.0)	99	94
HZSM-5(CH₃COONa, 4.0)	97	90
HZSM-5(CH₃COONa, 6.0)	85	82
HZSM-5(Na₂CO₃, 2.0)	62	74
HZSM-5(NaOH, 1.0)	24	63

Sample	A_BET/(m²·g^-1)	A_ext/(m²·g^-1)	v_micro/(cm³·g^-1)	v_meso/(cm³·g^-1)	d_aver/nm
HZSM-5(0)	357.92	29.98	0.17	0.04	1.52
HZSM-5(CH₃COONa, 2.0)	366.64	74.43	0.16	0.07	2.35
HZSM-5(CH₃COONa, 4.0)	378.69	103.83	0.16	0.11	2.93
HZSM-5(CH₃COONa, 6.0)	375.72	93.98	0.15	0.14	3.26
HZSM-5(Na₂CO₃, 2.0)	372.64	85.48	0.13	0.17	3.51
HZSM-5(NaOH, 1.0)	360.23	66.25	0.08	0.28	4.67

Sample	A_BET/(m²·g^-1)	A_ext/(m²·g^-1)	v_micro/(cm³·g^-1)	v_meso/(cm³·g^-1)	d_aver/nm
HZSM-5(0)	357.92	29.98	0.17	0.04	1.52
HZSM-5(CH₃COONa, 2.0)	366.64	74.43	0.16	0.07	2.35
HZSM-5(CH₃COONa, 4.0)	378.69	103.83	0.16	0.11	2.93
HZSM-5(CH₃COONa, 6.0)	375.72	93.98	0.15	0.14	3.26
HZSM-5(Na₂CO₃, 2.0)	372.64	85.48	0.13	0.17	3.51
HZSM-5(NaOH, 1.0)	360.23	66.25	0.08	0.28	4.67

Acid strength	Relative acid amount/%
Acid strength	HZSM-5(0)	HZSM-5 (CH₃COONa, 2.0)	HZSM-5 (CH₃COONa, 4.0)	HZSM-5 (CH₃COONa, 6.0)	HZSM-5 (Na₂CO₃, 2.0)	HZSM-5 (NaOH, 1.0)
Strong	100	98.17	90.83	102.25	103.47	108.15
Weak	100	98.14	90.06	101.86	103.18	107.28

Catalystic Performance of HZSM-5 Zeolite Treated by CH₃COONa

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Figures/Tables 12

References 17

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Catalyst	Hydrogen chemisorption/ (mL·g^-1Pt)	Bare fraction of metallic Pt/%
Pt/HZSM-5(0)	15.0	34.8
Pt/HZSM-5(CH₃COONa, 2.0)	21.7	50.4
Pt/HZSM-5(CH₃COONa, 4.0)	22.8	52.9
Pt/HZSM-5(CH₃COONa, 6.0)	22.2	51.6
Pt/HZSM-5(Na₂CO₃, 2.0)	19.5	45.2
Pt/HZSM-5(NaOH, 1.0)	16.6	38.6

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