Effects of Sn Loading on Catalytic Performance of PtSn/Al2O3 in Propane Dehydrogenation†

doi:10.7503/cjcu20180545

Abstract

Abstract:

PtSn/Al₂O₃ catalysts with different Pt/Sn molar ratios(3:1, 1:1, 1:2 and 1:3) were prepared by carbonylation-impregnation method. The catalysts were characterized by means of nitrogen adsorption-desorption, X-ray diffraction(XRD), transmission electron microscopy(TEM), infrared spectra of pyridine adsorption(Py-IR), and thermogravimetric-differential thermal analysis(TG-DTA). The effect of Sn loading on the catalytic properties of PtSn/Al₂O₃ in the propane dehydrogenation was studied. The results showed that the PtSn/Al₂O₃ catalyst had high propylene selectivity and catalytic stability. Platinum and tin were mainly in the form of Pt₃Sn and PtSn alloys with Pt/Sn ratios of 3:1 and 1:1. With the formation of the alloy, the dehydrogenation performance of the catalyst was improved significantly, and the high temperature sintering of metal particles was effectively suppressed. When the Pt/Sn ratio was 1:2 and 1:3, the metallic Pt was mainly resulted. With the increase of Sn loading, the Lewis acid sites on the catalyst gradually decreased, and the propylene selectivity increased associated with the propane conversion decreased. At the same time, the addition of Sn promoted the migration of carbon deposition from the metal surface to support, and improved the stability of the catalyst.

Key words: Propane dehydrogenation, PtSn catalyst, Sn loading

CLC Number:

O643.38

TrendMD:

MA Zhanhua,LI Shuai,JIANG Aijing,LI Jun,SUN Lanyi,WEI Guijuan,AN Changhua. Effects of Sn Loading on Catalytic Performance of PtSn/Al₂O₃ in Propane Dehydrogenation^†[J]. Chem. J. Chinese Universities, 2019, 40(2): 326.

Figures/Tables 8

Table 1 Texture properties of Al2O3 support and PtSn/Al2O3 catalysts with different Pt/Sn ratios

Sample	Specific area/(m²·g^-1)	Average pore diameter/nm	Pore volume/(cm³·g^-1)
Al₂O₃	239.5	7.02	0.53
PtSn(3:1)/Al₂O₃	204.3	6.23	0.45
PtSn(1:1)/Al₂O₃	198.3	6.64	0.46
PtSn(1:2)/Al₂O₃	204.0	6.81	0.50
PtSn(1:3)/Al₂O₃	194.5	6.79	0.47

Fig.1 N2 adsorption-desorption isotherms(A) and pore size distribution(B) of Al2O3(a), PtSn(3:1)/Al2O3(b), PtSn(1:1)/Al2O3(c), PtSn(1:2)/Al2O3(d) and PtSn(1:3)/Al2O3(e)

Fig.2 XRD patterns of PtSn/A2O3(A) and unsupported PtSn(B) samples

Fig.3 HRTEM images and corresponding FFTs(inset) of PtSn(3:1)/Al2O3(A), PtSn(1:1)/Al2O3(B), PtSn(1:2)/Al2O3(C) and PtSn(1:3)/Al2O3(D)

Fig.4 IR spectra of pyridine adsorbed on Al2O3(a), PtSn(3:1)/Al2O3(b), PtSn(1:1)/Al2O3(c), PtSn(1:2)/Al2O3(d) and PtSn(1:3)/Al2O3(e)。

Fig.5 Catalytic performance of PtSn/Al2O3 catalysts with different Pt/Sn ratios in the propane dehydrogenation

Fig.6 TG-DTA analysis of PtSn(3:1)/Al2O3(a), PtSn(1:1)/Al2O3(b), PtSn(1:2)/Al2O3(c) and PtSn(1:3)/Al2O3(d)

Fig.7 TEM images(A1, B1) and particle size distribution(A2, B2) of fresh(A1, A2) and reacted(B1, B2) PtSn(3:1)/Al2O3 catalyst

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Effects of Sn Loading on Catalytic Performance of PtSn/Al₂O₃ in Propane Dehydrogenation^†

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