Hβ Modified Co/SiO2 Catalysts for Fischer-Tropsch Synthesis of Jet Fuel-range Hydrocarbons

doi:10.3724/SP.J.1077.2014.13479

Abstract

Abstract:

Bi-functional catalysts were prepared using hybrid supports, mesoporous SiO₂(SG) and microporous Hβ zeolites with different Si/Al ratios of 25, 60 and 80 for direct jet fuel-range hydrocarbon synthesis (C₈-C₁₈). The textual and structural properties of the catalysts were studied by Fourier transform infrared (FTIR), X-ray diffraction(XRD), H₂-temperature-programmed desorption(H₂-TPR) and N₂ physisorption. The results showed that catalysts supported on tailor-made SiO₂ and Hβ hybrid maintained both meso- and micro-pores with acid centers. With the decrease of Si/Al ratio, the bands corresponding to the characteristic adsorptions of Co/SG/Hβ catalysts shifted to the lower wave numbers, which accompanied by increased acidity. SiO₂ decreased the acidity of Hβ and the interaction between Co and support, resulting in high Co dispersion, reduction and CO conversion for Co/SG/Hβ. The microporous structure and acidity of Hβ accelerated the hydrocracking/hydroisomerizaion reaction, which contributed to the high selectivity to jet fuel-range isoparaffins. The increased BET surface area and microporous volume with moderate acidity of Co/SG/Hβ(80) were essential for its high CO conversion (95.7%) and selectivity to jet fuel-range hydrocarbons (42.3%, including 27.6% of isoparaffins).

Key words: Co/SiO₂ catalysts, Hβ zeolite, FT synthesis, jet fuel-range hydrocarbon, pore structure

CLC Number:

TQ426

LI Yu-Ping, WANG Tie-Jun, MA Long-Long, WU Chuang-Zhi, DING Ming-Yue. Hβ Modified Co/SiO₂ Catalysts for Fischer-Tropsch Synthesis of Jet Fuel-range Hydrocarbons[J]. Journal of Inorganic Materials, 2014, 29(6): 599-604.

Figures/Tables 6

References 15

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Catalysts	S_BET/<br/>(m²·g^-1)	Micropore<br/>area/<br/>(m²·g^-1)	BJH mesopore		Micropore<br/> volume/<br/>(cm³·g^-1)	Pore size/nm		d_Co^o/<br/>nm^a	Reduction<br/>degree/<br/> %^b	Co D/<br/>%^c	X_CO/ <br/>%
Catalysts	S_BET/<br/>(m²·g^-1)	Micropore<br/>area/<br/>(m²·g^-1)	Area/<br/>(m²·g^-1)	Volume/<br/>(cm³·g^-1)	Micropore<br/> volume/<br/>(cm³·g^-1)	BJH	HK	d_Co^o/<br/>nm^a	Reduction<br/>degree/<br/> %^b	Co D/<br/>%^c	X_CO/ <br/>%
Co/SG	188	-	324	0.74	-	9.63	-	18.8	44.7	4.89	41.4
Co/SG/Hβ(25)	250	55	290	0.97	0.05	9.75	0.49	15.2	64.4	5.61	83.0
Co/SG/Hβ(60)	262	69	300	1.50	0.05	9.89	0.50	14.7	73.6	6.15	82.3
Co/SG/Hβ(80)	253	69	268	0.57	0.07	9.60	0.50	14.6	76.1	6.31	95.7
Co/Hβ(80)	425	326	-	-	0.16	-	0.50	25.2	60.7	5.23	70.6

Catalysts	S_BET/<br/>(m²·g^-1)	Micropore<br/>area/<br/>(m²·g^-1)	BJH mesopore		Micropore<br/> volume/<br/>(cm³·g^-1)	Pore size/nm		d_Co^o/<br/>nm^a	Reduction<br/>degree/<br/> %^b	Co D/<br/>%^c	X_CO/ <br/>%
Catalysts	S_BET/<br/>(m²·g^-1)	Micropore<br/>area/<br/>(m²·g^-1)	Area/<br/>(m²·g^-1)	Volume/<br/>(cm³·g^-1)	Micropore<br/> volume/<br/>(cm³·g^-1)	BJH	HK	d_Co^o/<br/>nm^a	Reduction<br/>degree/<br/> %^b	Co D/<br/>%^c	X_CO/ <br/>%
Co/SG	188	-	324	0.74	-	9.63	-	18.8	44.7	4.89	41.4
Co/SG/Hβ(25)	250	55	290	0.97	0.05	9.75	0.49	15.2	64.4	5.61	83.0
Co/SG/Hβ(60)	262	69	300	1.50	0.05	9.89	0.50	14.7	73.6	6.15	82.3
Co/SG/Hβ(80)	253	69	268	0.57	0.07	9.60	0.50	14.6	76.1	6.31	95.7
Co/Hβ(80)	425	326	-	-	0.16	-	0.50	25.2	60.7	5.23	70.6

Hβ Modified Co/SiO₂ Catalysts for Fischer-Tropsch Synthesis of Jet Fuel-range Hydrocarbons

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