Facile Preparation of Nitrogen-doped Porous Carbons via Salt Melt Synthesis with Efficient Catalytic Desulfurization Performance

doi:10.15541/jim20160632

Abstract

Abstract:

A series of N-doped porous carbons were prepared using biomass D-glucose and nitrogen-rich melamine as precursors via facile salt melt synthesis method. The obtained N-doped porous carbons exhibit developed porosity (BET surface area up to 1355 m²/g) and notablely high nitrogen content (20.73wt%). X-ray photoelectron spectroscope (XPS) results indicate that the nitrogen configurations in the carbons are mainly pyrrolic and pyridinic functional groups, which are in favor of catalytic oxidation of hydrogen sulfide to elemental sulfur. High sulfur capacity of 1.10 g/g is achieved over the optimized carbon materials at room temperature and ambient pressure, showing the excellent adsorptive-catalytic performance of N-doped porous carbons for hydrogen sulfide removal. The facile synthesis route enables a great potential for the scale-preparation of N-doped porous carbons and application in pollution control.

Key words: nitrogen-doped porous carbon, salt melt synthesis, hydrogen sulfide, metal free catalytic oxidation

CLC Number:

O613

YU Zheng-Fa, WANG Xu-Zhen, HOU Ya-Nan, ZHAO Zong-Bin, Rui Li, QIU Jie-Shan. Facile Preparation of Nitrogen-doped Porous Carbons via Salt Melt Synthesis with Efficient Catalytic Desulfurization Performance[J]. Journal of Inorganic Materials, 2017, 32(7): 770-776.

Figures/Tables 8

Scheme 1 Illustration of the synthetic process for NPCs

Fig. 1 (a-d) FESEM images of NPC-1.0-700, and c (e), N (f) and O (g) elemental mapping images of (d)

Fig. 2 Nitrogen adsorption isotherms (a, c) and pore size distribution curves (b, d) for NPCs

Table 1 Pore structure of NPCs

Sample	S_BET^a/ (m²·g^-1)	V_tot^b/ (cm³·g^-1)	V_mic^c/ (cm³·g^-1)
NPC-0-700	645	0.909	0.146
NPC-0.25-700	927	0.645	0.296
NPC-0.5-700	1129	0.736	0.271
NPC-1.0-700	1355	0.858	0.419
NPC-2.0-700	1229	0.814	0.393
NPC-1.0-550	1201	0.792	0.414
NPC-1.0-850	1383	0.869	0.478
NPC-1.0-1000	1416	0.904	0.445

Table 2 Chemical compositions of NPCs

Sample	C/wt%	H/wt%	O^a/wt%	N/wt%
NPC-0-700	91.67	0.073	8.26	0
NPC-0.25-700	77.70	0.820	9.60	11.88
NPC-0.5-700	73.32	1.060	9.55	16.07
NPC-1.0-700	63.89	1.340	14.04	20.73
NPC-2.0-700	55.47	2.120	18.43	23.98
NPC-1.0-550	57.14	2.220	14.58	26.06
NPC-1.0-850	75.59	0.940	13.48	9.99
NPC-1.0-1000	87.04	0.360	9.26	3.34

Fig. 3 XPS survey (a, c) and high-resolution N1s spectra (b, d) of NPCs

Fig. 4 (a, c) H2S breakthrough curves, (b, d) sulfur capacities of NPCs, (e, f) the relationship between sulfur capacities and nitrogen content, porosity

Fig. 5 (a) XRD patterns and (b) TGA curves in N2 of fresh and exhausted NPC-1.0-700 sample. (c) FESEM image of the exhausted NPC-1.0-700. The elemental N (a) and S (e) mapping images of (c)

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