Ni/SAPO-11 Promoted by Rare Earth Element Ce for Hydroisomerization of n-Heptane†

doi:10.7503/cjcu20140075

Abstract

Abstract:

The monometallic catalyst Ni/SAPO-11 was prepared via the impregnation method. Then, the bimetallic catalyst Ni-Ce/SAPO-11 was prepared via the sequential impregnation method. The crystal structure and acidity of these two catalysts were determined by X-ray powder diffraction, Brunauer-Emmett-Teller(BET) methods and temperature-programmed desorption of ammonia. With addition of Ce, the BET surface areas and porous volume of Ni/SAPO-11 and total acidity were increased, and the acid strength was decreased. Introduction of Ce improved the dispersion of Ni on the surface of SAPO-11. Addition of Ce could improve the selectivity of the hydroisomerization of n-heptane considerably. Under the conditions of n(H₂)/n(n-C₇H₁₆)=12, weight hourly space velocity=3.52 h^-1, catalyst weight=0.3 g, and the reaction temperature of 300 ℃, the conversion of n-heptane could reach 25.4% and the isomerization selectivity to i-heptane could reach 90.4%.

Key words: SAPO-11 molecular sieve, Ni-Ce/SAPO-11 catalyst, Cerium, Nickel, n-Heptane, Isomerization

CLC Number:

O643.3

TrendMD:

SUO Yanhua, LI Xiumin, CHEN Gang, CUI Yingxue, SUN Yujia, WANG Yingjun. Ni/SAPO-11 Promoted by Rare Earth Element Ce for Hydroisomerization of n-Heptane^†[J]. Chem. J. Chinese Universities, 2014, 35(6): 1252.

Figures/Tables 7

Fig.1 XRD patterns of SAPO-11(a), Ni/SAPO-11(b) and Ni-Ce/SAPO-11(c—e) Mass fraction of Ce(%): c. 0.5; d. 2; e. 10.

Fig.2 SEM images of SAPO-11(A, D), Ni/SAPO-11(B, E) and Ni-2%Ce/SAPO-11(C, F)

Table 1 BET data of different catalysts*

Sample	S_BET/(m²·g^-1)	V_p/(cm³·g^-1)	D/nm	Sample	S_BET/(m²·g^-1)	V_p/(cm³·g^-1)	D/nm
SAPO-11	141	0.14	3.9	Ni-2%Ce/SAPO-11	130	0.13	4.1
Ni/SAPO-11	96	0.11	4.8	Ni-10%Ce/SAPO-11	73	0.07	4.1
Ni-0.5%Ce/SAPO-11	113	0.12	4.4

Fig.3 IR spectra of SAPO-11(a), Ni/SAPO-11(b) and Ni-2%Ce/SAPO-11(c)

Fig.4 NH3-TPD profiles of SAPO-11(a), Ni/SAPO-11(b) and Ni-2%Ce/SAPO-11(c)

Table 2 Effect of the amount of Ce for the performance of the isomerization of n-heptane*

Sample	Conversion(%)	Selectivity(%)	Isomer distribution(%)
Sample	Conversion(%)	Selectivity(%)	MB	DB	TB
Ni/SAPO-11	35.8	50.6	66.4	32.3	1.3
0.5%Ce-Ni/SAPO-11	35.3	66.8	67.6	31.2	1.2
2%Ce-Ni/SAPO-11	28.8	82.7	72.5	26.7	0.8
10%Ce-Ni/SAPO-11	18.6	76.2	86.3	13.1	0.6

Fig.5 Stability test of the Ni-2%Ce/SAPO-11 catalyst for the isomerization of n-heptaneReduction temperature: 500 ℃(for 6 h); reaction temperature: 300 ℃; weight hourly space velocity=3.52 h-1; n(H2)/n(n-C7H16)=12.

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