FUEL
·
2024
·
IF 6.7
Qiang Gao,Hongyun Hu,Chan Zou,Yan Ding,Chao He,Xian Li,Hong Yao
Pyrolysis is regarded as a practical way for waste tires to achieve waste-to-resource objectives. However, the environmental risk of pollution emissions in product utilization caused by the migration of sulfur is an important issue in the waste tire disposal industry. This study introduced a solution to using the binary molten salt system (NaOH-Na 2 CO 3 ) as a heat transfer and desulfurization medium for the thermal utilization of waste tires. The results demonstrated that molten salts had in-situ desulfurization capability at 425 °C −575 °C and inhibited the migration of sulfur to gas–liquid-solid products with the total sulfur ratio reduced by 50 % − 67 %. The sulfur-containing radical intermediates could be extensively consumed by molten salt, leading to a low concentration level of H 2 S and COS in gaseous products. Simultaneously, molten salt blocked the traditional pathway of the sulfhydryl radical with inorganic additives, weakening the sulfur enrichment to char. Additionally, molten salt enhanced heat transfer during pyrolysis, facilitating the decomposition of thiazole and the polymerization of sulfur-containing benzene ring (2,3-dimethyl-thiophene to benzothiophene). The online monitoring further corroborated that COS release was preceded by H 2 S at high temperatures (>500 °C) along with the full degradation of the waste tires. Higher desulfurization efficiency of molten salt was achieved with feedstocks of small particle size, as it allows for adequate exposure of the reaction contact sites. This approach provides a new opportunity for in-situ desulfurization of waste tire pyrolysis via molten salt thermal treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Junhao Lin,Qinxiong Liao,Yaping Hu,Rui Ma,Chongwei Cui,Shichang Sun,Xiangli Liu
The generation of sulfur-containing pollution products affects the quality of biofuels obtained from the supercritical water gasification (SCWG) of sludge . This study investigates the effects of the gasification temperature, moisture content, and reaction atmosphere on the evolution of sulfur-containing compounds. The results showed that temperature was the key parameter causing the migration of sulfur from sludge to biogas and liquid products. The sludge decomposition reaction was dominated by ionic reactions at 360 °C, while the decomposition of organic matter was converted to free radical reactions as the temperature increased from 380 °C to 440 °C. The mercaptan and thioether contents of the bio-oil decreased to 0.3% at 440 °C. Correspondingly, the concentration of H 2 S increased from 6.7 ppm to 38.0 ppm. The decomposition of organic sulfur with an unstable structure (S-H bond and S-C bond) was the main cause of the increase in the content of H 2 S. Additionally, the solubility and oxidation properties of supercritical water were extremely strong. Some sulfur-containing organic compounds were converted into SO 4 2- via hydrolysis and oxidation reactions, forming sulfate crystals with heavy metals in the bio-char, which aided in achieving the synergistic immobilization of sulfur and heavy metals.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Zhan-Ku Li,Zheng-Zhi Zhang,Kai Zhang,Hong-Lei Yan,Jing-Chong Yan,Zhi-Ping Lei,Shi-Biao Ren,Zhi-Cai Wang,Shi-Gang Kang,Heng-Fu Shui
The migration behavior of organic/inorganic sulfurs is vital for producing high-quality metallurgical coke via pyrolysis. Herein, Lengquan (LQ) fat coal was separated into extract (LQE) and residue (LQR) via ultrasonic extraction, and migration behavior of extracted and residual sulfur as well as effects of LQE and LQR on sulfur removal from coke were further explored in pyrolysis process. The results indicate that LQE has higher volatiles, hydrogen and oxygen contents, while more ash and organic aromatic matrix were remained in LQR. The predominance of difficultly eliminated organic sulfurs in LQE and higher content of easily pyrolyzable inorganic sulfurs in LQR result in weaker and stronger desulfurization effect in pyrolysis, respectively. Sulfides, pyrites, and sulfates are relatively easy to be removed from coke, while sulfones, thiophenes, and sulfoxides are more thermally stable. In co-pyrolysis of LQ with LQE/LQR, the migration of various sulfurs, particularly thiophenes, from coke was significantly enhanced, and the maximum sulfur removal ratio of ca. 56% was achieved in LQ and LQE co-pyrolytic coke. LQE acts as hydrogen/oxygen radical donor and mass transfer promoter, while LQR serves as assistor for gaseous sulfur release, resulting in synergistic desulfurization in LQ with LQE/LQR co-pyrolysis.
研究领域:
煤炭科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Linfei Zhao,Zhangfu Yuan,Hongbiao Dong,Hongxin Zhao
By synthesizing Cu 7 S 4 catalysts with abundant structural defects from Cu 2 O aerogels as precursors, the influence of sulfur on CO 2 RR is investigated. On the surface of the Cu 7 S 4 catalyst, the conversion of CO 2 to C 2 H 5 OH can be achieved under less negative potential conditions. At more negative conditions, Cu 7 S 4 undergoes reconstruction, and the dominant product shifts to HCOOH due to the dissolution of sulfur elements, which is caused by the adsorption of sulfur atoms on the metal Cu surface after the restructuring of Cu 7 S 4 . On the surface of Cu aerogels with low concentration of adsorbed sulfur atoms, a maximum FE of 79.4 % for HCOOH is achieved at –1.2 V vs. RHE. Density functional theory (DFT) calculations indicate that sulfur atoms located the lattice and those adsorbed on the surface post-dissolution favor the formation of C 2 products and HCOOH, respectively.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Tao Xue,Han Miao,Mengge Wang,Jinlin Man,Yudi Yang,Shaoliang Lin,Xinxin Li
The emerging amorphous structure of metal nanomaterials as catalysts has revealed enormous potential; yet, their application is hindered by limited synthesis methods. In this study, we developed a facile strategy for synthesizing an amorphous FeS/heteroatom-doped carbon hybrid material as a highly efficient catalyst. Leveraging sulfur migration at high temperatures and the confinement effect provided by a hyper-cross-linked polymer (HCP), we achieved one-step carbonization and heterogeneous catalyst fabrication. The HCP offers multiple benefits and synergistic effects, serving as both a sulfur source and confinement matrix, attributed to its exceptional designability, structural stability, and cost-effectiveness. The resulting amorphous structure exhibited superior catalytic performance in the Fenton reaction compared to crystalline structures. Furthermore, the formation process and mechanism of this amorphous catalyst are extensively discussed. The reasons behind its exceptional catalytic efficiency in the Fenton reaction were also explored, suggesting that the acceleration mechanism of heteroatom-doped carbon may stem from its remarkable capacity for accepting and transferring electrons. This work has developed a novel and facile strategy for preparing amorphous FeS/carbon hybrid materials and offered valuable insights into optimizing the efficiency of the Fenton reaction for wastewater treatment and beyond.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Li Min,Li Hong,Fan Hefei,Liu Qianfeng,Yan Zhao,Wang Aiqin,Yang Bing,Wang Erdong
Hydrogen production from seawater remains challenging due to the deactivation of the hydrogen evolution reaction (HER) electrode under high current density. To overcome the activity-stability trade-offs in transition-metal sulfides, we propose a strategy to engineer sulfur migration by constructing a nickel-cobalt sulfides heterostructure with nitrogen-doped carbon shell encapsulation (CN@NiCoS) electrocatalyst. State-of-the-art ex situ / in situ characterizations and density functional theory calculations reveal the restructuring of the CN@NiCoS interface, clearly identifying dynamic sulfur migration. The NiCoS heterostructure stimulates sulfur migration by creating sulfur vacancies at the Ni 3 S 2 -Co 9 S 8 heterointerface, while the migrated sulfur atoms are subsequently captured by the CN shell via strong C-S bond, preventing sulfide dissolution into alkaline electrolyte. Remarkably, the dynamically formed sulfur-doped CN shell and sulfur vacancies pairing sites significantly enhances HER activity by altering the d -band center near Fermi level, resulting in a low overpotential of 4.6 and 8 mV at 10 mA cm −2 in alkaline freshwater and seawater media, and long-term stability up to 1000 h. This work thus provides a guidance for the design of high-performance HER electrocatalyst by engineering interfacial atomic migration.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Zhengzhi Zhang,Honglei Yan,Zhanku Li,Muxin Liu,Jingchong Yan,Weidong Zhang,Zhicai Wang,Zhiping Lei,Shibiao Ren,Hengfu Shui
Understanding the structural characteristics of high-sulfur coking coals is essential for the effective use of high-sulfur coals. In this study, thermal dissolution was employed to separate the Duizhen high-sulfur coking coal (DZ) into an extract (DZE) and a residue (DZR). The influence of the structural differences between DZE and DZR on sulfur migration behavior was further investigated, and the quality of the cokes from co-pyrolysis of DZ with DZE and DZR was evaluated. The results indicate that DZE is rich in aliphatic chain structures and oxygen-containing functional groups, whereas DZR retains a higher content of aromatic matrix and ash. DZE promotes the migration and transformation of sulfoxides and thiophenes by releasing reactive H and enhancing mass transfer. In contrast, the highly aromatic structure of DZR tends to bind with reactive sulfur species, forming stable sulfur-containing compounds, which thereby inhibits the release of H 2 S. Functioning as both a hydrogen donor and a binder modifier, DZE not only enhances synergistic desulfurization during co-pyrolysis but also contributes to improved coke quality. Although DZF also supports desulfurization to some extent, its limited caking properties and elevated ash content adversely affect the structural integrity and overall quality of the resulting coke. This study further explored the synergistic effects occurring during the co-pyrolysis process, revealing how the distinct structural features of the separated fractions influence sulfur migration behavior. This study provides theoretical basis and technical pathways for the clean and efficient conversion and resource utilization of high-sulfur coal.
研究领域:
煤化学
·
能源化工
·
材料科学
·
洁净煤技术
·
热解化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）