Preparation and Performance of Pt/IZM-2 Catalyst on the Hydroisomerization of n-Dodecane†

doi:10.7503/cjcu20170612

Abstract

Abstract:

IZM-2 added CTAC(cetyltrimethylammonium chloride) was synthesized by hydrothermal method. The bifunctional catalysts 0.5%Pt/IZM-2 were prepared via the incipient wetness impregnation technique, and their catalytic performance of the hydroisomerization of n-dodecane was investigated on the fixed-bed continuous-flow reactor. SEM and BET analysis prove the agglomeration weakening of the catalyst. NH₃-TPD and H₂-TPR results show the weaker reduction ability and fewer medium/strong acid sits of Pt/IZM-2-CTAC. The results showed that the aggregation effect of the IZM-2 particles is obviously inhibited after the addition of cation surfactants, and the mesoporous pore volume and specific surface area are increased, which provides more space for the diffusion of the reaction intermediates and shortens the residence time of the isomers in the pores. Thereby it surpresses the occurrence of the cracking reaction and increases the hydroisomerization selectivity as well as the yield of isoparaffins.

Key words: IZM-2 molecular sieve, Hydroisomerization, Isomerization, Selectivity, Bifuctional catalyst

CLC Number:

O643

TrendMD:

LI Chuansong, DU Yanyan, XUE Xuzhi, XIANG Xianzheng, LI Jiusheng, REN Tianhui. Preparation and Performance of Pt/IZM-2 Catalyst on the Hydroisomerization of n-Dodecane^†[J]. Chem. J. Chinese Universities, 2018, 39(4): 729.

Figures/Tables 9

Fig.1 XRD patterns of IZM-2 molecular sieves without(a) and with CTAC(b)

Fig.2 SEM images of IZM-2(A, B) and IZM-2-CTAC(C, D)

Fig.3 N2 adsorption-desorption isotherms of IZM-2(a) and IZM-2-CTAC(b)

Table 1 Physico-chemical properties of IZM-2 and IZM-2-CTAC samples

Sample	Surface area/(m²·g^-1)			Pore volume(cm³·g^-1)
Sample	$S a BET$	$S b micro$	$S c meso$	$V d total$	$V b micro$	$V c meso$
IZM-2	185	129	56	0.170	0.054	0.116
IZM-2-CTAC	324	214	110	0.370	0.133	0.237

Table 1 Physico-chemical properties of IZM-2 and IZM-2-CTAC samples

Sample	Surface area/(m²·g^-1)			Pore volume(cm³·g^-1)
Sample	$S a BET$	$S b micro$	$S c meso$	$V d total$	$V b micro$	$V c meso$
IZM-2	185	129	56	0.170	0.054	0.116
IZM-2-CTAC	324	214	110	0.370	0.133	0.237

Fig.4 H2-TPR curves of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b)

Fig.5 NH3-TPD curves of IZM-2(a) and IZM-2-CTAC(b)

Fig.6 Activity of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b) catalysts for the hydroisomerization of n-dodecane

Fig.7 Isomerization selectivity of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b) catalysts for the hydroisomerization of n-dodecane

Fig.8 Isomer yields of Pt/IZM-2(a) and Pt/IZM-2-CTAC(b) catalysts for the hydroisome-rization of n-dodecane

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