NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 13
·5822-5828
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IF 3.591
Yingwu Wang,Qiang Lin,Ping Ning,Chi Wang,Heping Zeng,Xin Sun,Xin Song,Kai Li
H2S and PH3, which are ore-thermal furnace gases, are harmful to humans and the environment. Here, the performance of a catalyst, Ce–Cu–Al trimetallic composite catalyst, is further explored by examining the influence of the used acid. The effects of acids on the structural features, surface functional groups, and activity of the catalysts were examined. Test results showed that the catalyst fabricated using 71.7 mmol nitric acid performed the best, and its capacity reached 229.8 mg g−1 (H2S) and 201.9 mg g−1 (PH3). Besides, SEM and TEM showed that the whole structure of catalysts was sharply changed by the species of the acid used, which was caused by the different combinations of components in the catalyst system. Because of the change in the catalyst structure, their physical and chemical properties are also adjusted. Using nitric acid could endow the catalyst with better properties, such as the best specific surface area, higher total pore volume, the strongest acid center, and the best reducing power. Combining the analysis results of FTIR spectroscopy, it was found that the detailed functional groups of NH2− and νON played a role in the reaction.
研究领域:
催化
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环境化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 3
·1097-1106
·
IF 3.069
Shujian Liu,Mingdi Pan,Zhongmin Feng,Yangchun Qin,Yun Wang,Lili Tan,Ting Sun
In this article, a garlic skin-derived porous biomass carbon (GSP-BC) material with an ultra-high specific surface area was prepared using KOH as an activator. The morphology and structure of the GSP-BC were evaluated. The ultra-high surface area, average pore diameter and total pore volume of the GSP-BC are 3686 m2 g−1, 2.43 nm and 1.96 cm3 g−1, respectively, which enable the GSP-BC to have an outstanding adsorption capacity of 1911.8 mg g−1 for tetracycline hydrochloride (TCH). Some important variables such as initial concentration (300–800 mg L−1), contact time, solution pH (3–10), ionic strength, and temperature (290–313 K) were investigated systematically. The experimental data of adsorption kinetics and isotherms were well fitted by the pseudo-second-order model and the Freundlich model, respectively. Furthermore, the adsorption process was spontaneous and endothermic. Moreover, the GSP-BC has excellent adsorption capacity for other tetracycline antibiotics. The findings reveal that it is feasible to use garlic skin waste as the precursor to prepare porous biomass carbon with high surface area.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yangwen Liu,Qiao Liu,Lin Wang,Xianfeng Yang,Weiyou Yang,Jinju Zheng,Huilin Hou
Hollow carbon nanofibers with hierarchical porous shells were prepared by NaOH activation of the electrospinning SiCNO fibers, followed by carbonization treatment. By adjusting the carbonization temperature, porous hollow carbon nanofibers with different Brunauer–Emmett–Teller (BET) specific surface areas and total pore volumes are obtained, both of which are explored as electrode materials for supercapacitors. It was found that the obtained products (HCF800) possess the highest BET specific surface area of 2628.10 m2/g and the largest pore volume of 2.32 cm3/g when the carbonized temperature was designed at 800 °C, thus displaying the best supercapacitor performance. The electrochemical results in a three-electrode system show that HCF800 exhibits a high specific capacitance of 330.11 F/g as the discharge current density is 1 A/g and still maintains 65.3% of its original specific capacitance when the current density reaches 20 A/g. Moreover, in a two-electrode system, HCF800 also exhibits an excellent specific capacity of 259.86 F/g at a current density of 1 A/g, marvelous cyclic stability with the specific capacitance retention of 95.3% even after 10,000 cycles, and a large energy density of 12.99 W h/kg at 1.0 A/g. Significantly, the supercapacitor performance of these porous hollow carbon nanofibers is also superior to that of many previously reported carbon materials, which proved them to be worthy candidates for high-performance electrode materials.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Guosheng Li,Yu Ding,Xiaohan Li,Kunhong Li,Xinrui Yin,Liang Zhao,Shenyong Ren,Chunming Xu,Baojian Shen
Regulation of electronic structure of metal active phase for catalysts has been known as efficient in promoting its catalytic activity; however, manipulating the activity of catalysts via controllable metal active phase electronic structure is still challenging. A non-equilibrium electronic structure Fe-based bulk catalyst has been developed via controllably adding P species, where the non-equilibrium electronic structure of Fe species is formed through the electron transfer from the Zn species through the P electronic channel. As a result, the catalytic activity of the modified Fe-based bulk catalysts has increased by 24.4–50.4%. Meanwhile, the sulfurization degree (SD) of the modified Fe-based bulk catalysts has increased by 5.6–25.9%. In addition, the HDS reaction rate constant ( k HDS ) has increased by about 2.0 times, and the DDS reaction rate constant ( k DDS ) has increased by about 2.4 times. The P modifying can regulate the directional transfer of unpaired free electrons between Fe and Zn species to form a more non-equilibrium electronic structure of Fe species, which can reduce the energy barrier of the C–S bond adsorbed on the P-modified Fe-based bulk catalysts. Importantly, the P species can be used as an active site to adsorb S-containing compounds in the modified Fe-based bulk catalysts, which is conducive to generating more coordinatively unsaturated sites (CUSs). The former can promote the formation of the more non-equilibrium electronic structure of Fe species, and the latter can adjust the adsorption active site of S-containing on the catalyst surface. Therefore, an electron transfer channel is formed among Fe, Zn, and P species, and another one is formed among Fe, P, and S-containing compounds, which form a dual-channel electron transfer behavior. Furthermore, the specific surface area, total pore volume, and reducibility of the modified Fe-based bulk catalysts have also shown varying degrees of improvement via the controllable addition of P species.
研究领域:
催化
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 5
·e4317
·
IF 3.581
Manman Jin,Guodi Zhang,Zhenmei Guo,Zhiguo Lv
Novel heterogeneous tungsten species in mesoporous silica SBA-16 catalysts based on ship-in-a-bottle methodology are originally reported for oxidizing cyclopentene (CPE) to glutaric acid (GAC) using hydrogen peroxide (H 2 O 2 ). For all W-SBA-16 catalysts, isolated tungsten species and octahedrally coordinated tungsten oxide species are observed while WO 3 crystallites are detected for the W-SBA-16 catalysts with Si/ W = 5, 10, and 20. The specific surface areas and the corresponding total pore volumes decrease significantly as increasing amounts of tungsten incorporated into the pores of SBA-16. Using tungsten-substituted mesoporous SBA-16 heterogeneous catalysts, high yield of GAC (55%) is achieved with low tungsten loading (for Si/W = 30, ~13 wt%) for oxidation of CPE. The W-SBA-16 catalysts with Si/W = 30 can be reused five times without dramatic deactivation. In fact, low catalytic activity provided by bulk WO 3 implies that the highly distributed tungsten species in SBA-16 and the steric confinement effect of SBA-16 are key elements for the outstanding catalytic performance.
研究领域:
化学
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材料科学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）