乌拉草基碳材料的储气性能

doi:10.7503/cjcu20160076

摘要/Abstract

摘要：

在不添加外源性化学活化剂的条件下直接碳化乌拉草制备了多孔碳材料UlaC-950-HF. 样品的碳含量高达93%, 并且显示出部分石墨化的趋势. 热重分析(TGA)结果显示样品具有很高的热稳定性(400 ℃前失重仅3%). N₂吸附-脱附测试结果表明样品的孔结构以微孔为主(峰值在1.1 nm), 并有少量的介孔, 总体的孔分布范围较窄, 孔结构为有利于甲烷吸附的狭缝状. 体积法测试结果表明, 在298 K, 3.5 MPa条件下, 乌拉草基多孔碳材料UlaC-950-HF的甲烷储存能力达到208 mg/g(质量分数17%)或体积容量达到232 mL/mL. 通过对产品的孔结构绘制模型并进行分析, 从理论上初步解释了样品拥有较高的高压甲烷储存能力的原因.

关键词: 生物质碳化, 乌拉草, 自身活化, 甲烷储存

Abstract:

Carex meyeriana Kunth was chosen as raw material to prepare porous carbon material(UlaC-950-HF) by the direct carbonization method without adding exogenous chemical activator. The result of analysis showed that the percentage of carbon in the sample was up to 93% and the product had a trend of part graphitizing. TGA result showed that the sample had high thermal stability(only 3% mass loss from 0 to 400 ℃). N₂ sorption isotherm results showed that the pore structure of porous carbon was mainly microporosity(maximal pore size distribution was 1.1 nm) with a small amount of mesoporous pore. The distribution of pore diameter was narrow. There were slit-like structures in the sample which were beneficial for storaging high-pressure methane. The capacity of methane storage of UlaC-950-HF was up to 208 mg/g(mass fraction, 17%) or volumetric capacity of 232 at 298 K and 3.5 MPa. This paper also explained the reason for the outstanding capacity of storaging high-pressure methane by drawing a theoretical model.

Key words: Carbonized biomass, Carex meyeriana Kunth, Self-activation, Methane storage

中图分类号:

O613.71

TrendMD:

王昀, 贲腾, 裘式纶. 乌拉草基碳材料的储气性能. 高等学校化学学报, 2016, 37(5): 801.

WANG Yun, BEN Teng, QIU Shilun. Performance of Gas Storage in Carex meyeriana Kunth-based Carbon^†. Chem. J. Chinese Universities, 2016, 37(5): 801.

图/表 12

参考文献 42

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Type	Material	Surface area/ (m²·g^-1)	Pore volume/ (cm³·g^-1)	Condition		CH₄ storage capacity(%)	Excess CH₄ uptake/ (mL·mL^-1)	Heat of adsorption/ (kJ·mol^-1)	Ref.
Type	Material	Surface area/ (m²·g^-1)	Pore volume/ (cm³·g^-1)	10^-5p/Pa		CH₄ storage capacity(%)	Excess CH₄ uptake/ (mL·mL^-1)	Heat of adsorption/ (kJ·mol^-1)	T/K
Porous	COF-102	3620	1.55	35	298	15.8	120	8.6	[27]
polymers	COF-103	3530	1.54	35	298	14.9	152	9.5	[27]
	HCP-1	1904	0.54	15	298	6.4			[28]
	HCP-4	1366	0.55	36	298	8.1			[28]
	PIM-1	850	0.349	15	293	3.8			[29]
	PPN-3	2840	1.7	35	295	12.2		15.2	[30]
	PPN-4	6461	3.04	55	295	21.5			[31]
MOFs	Cu₂(sbtc)[PCN-11]	1931	0.91	25	298	14.0	171	14.6	[32]
	Cu₂(adip)[PCN-14]	1753	0.87	35	290	15.3	220	30	[32]
	Ni(dhtp)[NiMOF-74,CPO-27-Ni]	1027	0.54	35	298	11.9	206	21.5—22	[32]
	(Cu₃(btc)₂)[HKUST-1]	1502	0.82	35	304	10.2	204	18.7	[32]
	Zn₄O(bdc)₃[MOF-5]	1870		36	300	13.5	110	12.2	[32]
Zeolites	CaX		0.36	32	298	7.5		24.68	[33]
Porous	CMK-3	950	0.87	35	298	7.5		19.78	[34]
carbon	K-PAF-1-750	2926		35	298	17.1		17.9	[35]
	Maxsorb A	3100		40	298	16.4	152		[36]
	KUA31752	3355		40	298	15.6	155		[36]
	PC	1220	0.47	20	298	10.2	141		[36]
	Saran A carbon 36X	1650		32	298	11.5			[36]
	KF-1500	1500		32	298	7.6			[10]

Type	Material	Surface area/ (m²·g^-1)	Pore volume/ (cm³·g^-1)	Condition		CH₄ storage capacity(%)	Excess CH₄ uptake/ (mL·mL^-1)	Heat of adsorption/ (kJ·mol^-1)	Ref.
Type	Material	Surface area/ (m²·g^-1)	Pore volume/ (cm³·g^-1)	10^-5p/Pa		CH₄ storage capacity(%)	Excess CH₄ uptake/ (mL·mL^-1)	Heat of adsorption/ (kJ·mol^-1)	T/K
Porous	COF-102	3620	1.55	35	298	15.8	120	8.6	[27]
polymers	COF-103	3530	1.54	35	298	14.9	152	9.5	[27]
	HCP-1	1904	0.54	15	298	6.4			[28]
	HCP-4	1366	0.55	36	298	8.1			[28]
	PIM-1	850	0.349	15	293	3.8			[29]
	PPN-3	2840	1.7	35	295	12.2		15.2	[30]
	PPN-4	6461	3.04	55	295	21.5			[31]
MOFs	Cu₂(sbtc)[PCN-11]	1931	0.91	25	298	14.0	171	14.6	[32]
	Cu₂(adip)[PCN-14]	1753	0.87	35	290	15.3	220	30	[32]
	Ni(dhtp)[NiMOF-74,CPO-27-Ni]	1027	0.54	35	298	11.9	206	21.5—22	[32]
	(Cu₃(btc)₂)[HKUST-1]	1502	0.82	35	304	10.2	204	18.7	[32]
	Zn₄O(bdc)₃[MOF-5]	1870		36	300	13.5	110	12.2	[32]
Zeolites	CaX		0.36	32	298	7.5		24.68	[33]
Porous	CMK-3	950	0.87	35	298	7.5		19.78	[34]
carbon	K-PAF-1-750	2926		35	298	17.1		17.9	[35]
	Maxsorb A	3100		40	298	16.4	152		[36]
	KUA31752	3355		40	298	15.6	155		[36]
	PC	1220	0.47	20	298	10.2	141		[36]
	Saran A carbon 36X	1650		32	298	11.5			[36]
	KF-1500	1500		32	298	7.6			[10]