Synthesis of Nano ZSM-23 Zeolites with Low L/D Value Morphology and Their Hydroisomerization Performance†

doi:10.7503/cjcu20160577

Abstract

Abstract:

Rod-like ZSM-23 zeolites with different length/diameter values(L/D) were synthesized using dimethylamine(DMA) and isopropylamine(IPA) as templates, respectively. The samples were characterized by means of XRD, SEM, XRF, N₂ sorption and NH₃-TPD. The crystals(ZSM-23-IPA) shows special nanoscaled and uniformed morphology with L/D<5, and more external surface areas by controlling the initial gel composition and hydrothermal reaction parameters. On n-dodecane hydroisomerization reaction, it also shows high conversion, selectivity and i-C₁₂ yield, which is associated with the more exposed active sites. Furthermore, Pt-ZSM-23-IPA catalyst also shows very good performance on real crude oil test. It indicates that ZSM-23 catalyst with low L/D value would be applied in the future for improving the low-temperature fluidity of lubricant oil in industry.

Key words: ZSM-23, Zeolite, Morphology, Hydroisomerization

CLC Number:

O643

TrendMD:

ZHANG Yujian, ZHAI Xuli, FU Kaimei, JIANG Tao. Synthesis of Nano ZSM-23 Zeolites with Low L/D Value Morphology and Their Hydroisomerization Performance^†[J]. Chem. J. Chinese Universities, 2017, 38(2): 231.

Figures/Tables 9

Table 1 Products crystallized at various alkalinity

n(Na₂O)/n(SiO₂)	Product	n(Na₂O)/n(SiO₂)	Product
0.03	Amorphous	0.125	ZSM-23
0.05	ZSM-23+Amorphous	0.15	ZSM-23+ZSM-5
0.075	ZSM-23	0.20	ZSM-5
0.10	ZSM-23

Fig.1 XRD patterns of ZSM-23-DMA(a) and ZSM-23-IPA(b)

Fig.2 SEM images of ZSM-23 with different templates of DMA(A, B) and IPA(C, D)

Fig.3 Crystallization curves of ZSM-23-DMA(a) and ZSM-23-IPA(b)

Table 2 Physico-chemical characteristics of ZSM-23-DMA and ZSM-23-IPA

Sample	Molar ratio of SiO₂/Al₂O₃	Na₂O(%)	S_BET/ (m²·g^-1)	S_Micropore/ (m²·g^-1)	S_External/ (m²·g^-1)	V_Micropore / (cm³·g^-1)
ZSM-23-DMA	90	0.32	165	126	39	0.06
ZSM-23-IPA	88	0.34	243	149	94	0.07

Fig.4 NH3-TPD profiles of ZSM-23-DMA(a) and ZSM-23-IPA(b)

Fig.5 Dependences of conversion of n-C12(A), yield of i-C12(B) on temperature and yield of i-C12 vs. conversion of n-C12(C) a. Pt-ZSM-23-DMA; b. Pt-ZSM-23-IPA.

Fig.6 Hydroisomerization processes of n-C12 on ZSM-23 with different L/D values

Table 3 Reaction parameters and lubricant base oil properties

Item	Pt-ZSM-23-DMA	Pt-ZSM-23-IPA
Reaction temperature/℃	345	335
$V H 2$ :V_Oil	500:1	500:1
LHSV/h^-1	0.75	0.75
Total yield of product(%)	86	87
Yield of 10cSt base oil(%)	54.6	63.4
Kinematic viscosity/(mm·s^-1)	9.54	9.61
Viscosity index	126	127
Pour point/℃	-15	-21

Table 3 Reaction parameters and lubricant base oil properties

Item	Pt-ZSM-23-DMA	Pt-ZSM-23-IPA
Reaction temperature/℃	345	335
$V H 2$ :V_Oil	500:1	500:1
LHSV/h^-1	0.75	0.75
Total yield of product(%)	86	87
Yield of 10cSt base oil(%)	54.6	63.4
Kinematic viscosity/(mm·s^-1)	9.54	9.61
Viscosity index	126	127
Pour point/℃	-15	-21

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