Preparation and Fischer-Tropsch Synthesis Performance of Hierarchical Co/Al-SiO2 Catalyst

doi:10.15541/jim20190500

Abstract

Abstract:

Hierarchically porous silica-aluminum is an important support material for metal-catalysts, because of its excellent properties. Herein, an efficient hydrothermal approach for the production of hierarchical aluminum- doped silica (Al-SiO₂) architectures was reported by employing aluminum nitrate as an aluminium source and TEOS as silicon source. Effects of the structure-oriented agent on the structure of Al-SiO₂ were investigated. Structural features of Al-SiO₂ were characterized by XRD, SEM and N₂-physisorption. The results showed that hierarchical Al-SiO₂ with "worm-like" porous of 30-40 nm can be synthesized by using TPAOH as the structure-oriented agent and hydrothermal treatment at 80 ℃. The cobalt catalysts were prepared by the wetness impregnation method. Compared with commercial SiO₂ supported cobalt catalysts, the Fischer-Tropsch synthesis performance of the catalyst Co/Al-SiO₂ is significantly enhanced, i.e., CO conversion nearly doubled, CH₄ selectivity reduced by 19.3wt%, C₂-C₄ selectivity reduced by 13.3wt%, and the selectivity of gasoline products (C₅-C₁₂) reached 53.3wt%.

Key words: hydrothermal method, hierarchical porous materials, Al-SiO₂, Cobalt catalyst, Fischer-Tropsch synthesis

CLC Number:

O643

WANG Juhan,WEN Xiong,LIU Chengchao,ZHANG Yuhua,ZHAO Yanxi,LI Jinlin. Preparation and Fischer-Tropsch Synthesis Performance of Hierarchical Co/Al-SiO₂ Catalyst[J]. Journal of Inorganic Materials, 2020, 35(9): 999-1004.

Figures/Tables 7

Fig. 1 SEM images (A) and XRD patterns(B) of Al-SiO2

Fig. 2 SEM images (A) and XRD patterns (B) of Al-SiO2 samples

Fig. 3 N2 adsorption-desorption curves and pore size distributions of Si-Al samples (a) Al-SiO2(t-80); (b) Al-SiO2(100); (c) Al-SiO2(120); (d) Al-SiO2(140)

Table 1 Pore structure parameters of samples

Sample	S_BET/(m²·g^-1)	V_pore/(cm³·g^-1)	D*/nm
Al-SiO₂(t-80)	79.1	0.45	22.8
Al-SiO₂(100)	67.1	0.65	38.5
Al-SiO₂(120)	49.1	0.55	44.5
Al-SiO₂(140)	304.7	0.18	2.4

Fig. 4 XRD patterns (A) and TEM images (B) of different catalysts

Fig. 5 H2-TPR(A) and TOS(B) profiles of different catalyst

Table 2 Activity and selectivity data of catalysts for Fischer-Tropsch synthesis

Catalyst	Load/%^a	CO con./%	Sel/wt%
Catalyst	Load/%^a	CO con./%	CH₄	C₂-C₄	C₅-C₁₂	C₁₂₊
Co/SiO₂	14.1	10.1	15.0	16.5	49.5	19.0
Co/Al-SiO₂(t-80)	14.6	21.4	12.1	14.3	53.3	17.3

References 21

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Preparation and Fischer-Tropsch Synthesis Performance of Hierarchical Co/Al-SiO₂ Catalyst

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