Preparation and performance study of catalyst for COS hydrolysis and adsorption in blast furnace gas

doi:10.11949/0438-1157.20211039

Abstract

Abstract:

The COS hydrolysis and sorption catalyst was prepared by exhausted activated coke (EAC) produced in the activated coke purification process in the moving bed. Combining with the results characterized by multiple methods (XRD, TG, BET, TPD, FTIR, SEM, and XPS), it was found that the more developed pore structures and more abundant surface groups appeared in the EAC, and the specific surface area reached 445.38 m²/g. The effects of different alkali loading and process parameters on COS catalytic hydrolysis efficiency were investigated, and the results showed the activity was strongest when the NaOH loading was 0.450% at 100℃ which the breakthrough sulfur capacity reached 126.58 mg/g. The analysis of the sample after reaction showed that the COS mainly exists as S in the waste coke. This sulfur fixation method increases the sulfur capacity and provides a new way for the cascade utilization of waste coke and sulfur resource utilization.

Key words: exhausted activated coke, COS, catalysis, hydrolysis, recovery, performance study

摘要：

以移动床活性焦烟气净化工艺运转中产生的磨损废活性焦（EAC）为原料制备羰基硫（COS）水解吸附材料，结合XRD、TG、BET、TPD、FTIR、SEM、XPS手段对EAC进行表征，发现磨损废焦具有发达的表面孔道结构与丰富的表面官能团，比表面积达445.38 m²/g。研究不同碱量改性及工艺参数对COS催化水解脱除效率的影响，结果表明在100℃下，负载0.450%NaOH时EAC催化剂活性最强，穿透硫容达126.58 mg/g。对反应后样品进行分析表明COS在废焦中主要以S存在，这种固硫方式增大了硫容量，为废焦的梯级利用与硫资源化提供了一条新途径。

关键词: 废活性焦, 羰基硫, 催化, 水解, 回收, 性能研究

CLC Number:

X511

Mingyu MA, Chao WANG, Yunjia LI, Changming LI, Xuejing LIU, Shiqiu GAO, Jian YU. Preparation and performance study of catalyst for COS hydrolysis and adsorption in blast furnace gas[J]. CIESC Journal, 2022, 73(1): 275-283.

马铭宇, 王超, 李运甲, 李长明, 刘雪景, 高士秋, 余剑. 高炉煤气中羰基硫水解吸附催化剂的制备及性能研究[J]. 化工学报, 2022, 73(1): 275-283.

Figures/Tables 8

Fig.1 Catalyst activity evaluation unit

Fig.2 XRD patten (a), TG curve (b), nitrogen adsorption-desorption isotherms (c) and pore size distribution (d) of EAC

Fig.3 TPD curves (a) and FTIR curve (b) of EAC

Fig.4 Effect of different temperature (a) and NaOH loading (b) on COS removal ability

Fig.5 Effect of different space velocity (a), loading quantity (b) and gas concentration (c) on COS removal ability, and the removal capacity of base modified EAC on sulfur-containing substance in simulated blast furnace gas (d)

Fig 6 High-resolution S 2p spectrums of EAC-0.450%NaOH before (a) and after (b) inactivation

Fig.7 SEM and EDS images of EAC-0.450%NaOH before (a) and after (b) inactivation

Table 1 The EDS results of EAC-0.450%NaOH before and after inactivation

样品	元素/%（质量）
样品	C	O	S	Na	Al	Si	Cl	Ca	Fe
EAC-0.450%NaOH失活前	87.28	11.13	0.30	0.74	0.06	0.11	0.04	0.14	0.10
EAC-0.450%NaOH失活后	83.23	12.34	3.15	0.82	0.07	0.09	0.03	0.21	0.06

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