Journal of Environmental Sciences
·
2024
·
IF 5.9
Jiahui Liu,Fangyuan Dong,Yaqi Huang,Yanghe Fu,Xinqing Lu,Rui Ma,Fumin Zhang,Shuhua Wang,Weidong Zhu
Reducing the cost of RuO 2 /TiO 2 catalysts is still one of the urgent challenges in catalytic HCl oxidation. In the present work, a Ce-doped TiO 2 supported RuO 2 catalyst with a low Ru loading was developed, showing a high activity in the catalytic oxidation of HCl to Cl 2 . The results on some extensive characterizations of both Ce-doped TiO 2 carriers and their supported RuO 2 catalysts show that the doping of Ce into TiO 2 can effectively change the lattice parameters of TiO 2 to improve the dispersion of the active RuO 2 species on the carrier, which facilitates the production of surface Ru species to expose more active sites for boosting the catalytic performance even under some harsh reaction conditions. This work provides some scientific basis and technical support for chlorine recycling.
研究领域:
化学工程
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催化科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 1
·1194-1201
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IF 1.338
Wang Yun,Guo Yuan,Shen Yuanyuan,Chen Rongjun,Wang Feihu,Zhou Dejian,Zhou Dejian
Traditionally, gold nanorods (GNRs) are mostly prepared via a seed-mediated growth approach, which usually produce an initial burst growth followed by slower kinetics and generate dogboneshaped GNRs with relatively small aspect ratios (ARs). We demonstrate here that the growth of GNRs
can be effectively retarded by addition of hydrochloric acid (HCl), leading to the formation of symmetric, long GNRs with high ARs. Furthermore, time-dependent kinetic analysis of GNR growth reveals two completely different growth modalities: in the absence of HCl, the GNR growth is rapid,
reaching a concentration of 0.64 nM in 10 min. Its AR also rapidly reaches a maximum value of 4.1 at 2 min and then gradually decreases to 3.3 over 5 h. In sharp contrast, in the presence of HCl additive, the GNR growth happens very slowly, reaching a concentration of 0.33 nM at 7 h, and the
AR also grows slowly to reach a maximum value of 5.3 at 3 h. These growth modalities endow different formation mechanisms of GNRs, which determine their aspect ratios and shape.
研究领域:
纳米生物学
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材料科学
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 11
·3184-3195
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IF 2.482
Wang Yong,Zhang Yuan,Wang Jinghua,Wang Ming,Cui Hongyou,Yi Weiming,Song Feng,Zhao Pingping,Sun Xiuyu,Xie Yujiao
Abstract Conversion of cellulose into glucose is one of the important approaches to biomass utilization, but the insolubility of cellulose in water makes it difficult to hydrolyze particularly in the case of heterogeneous catalysis due to the mass transfer obstacle between solid catalyst particles and cellulose particles. Temperature-responsive HCl-releasing catalysts have unique characteristic as they allow to catalyze the hydrolysis reaction of cellulose under homogeneous catalysts while the released HCl can be recovered and reused via simple cooling after reaction. In this paper, three mesoporous N-doped carbon materials (CNs) with temperature-responsive HCl-releasing ability were synthesized by carbonization of aminoguanidine hydrochloride at 400, 500 and 600 °C respectively. The basicity and the temperature-responsive HCl-releasing behavior of the as-prepared CNs are examined by means of acid–base titration and high temperature releasing experiment. The experimental results show that, of the three samples, CN-400 possesses the maximum HCl intake of 1.28 mmol HCl/g and can release about 1.15 mmol HCl/g when being heated to 220 °C. Employing CN-400· n HCl as the catalyst, a total reducing sugars (TRS) yield of 81.1% and 61.1% glucose yield can be obtained after reaction under 220 °C for 60 min. The considerable basic sites are derived from the pyridine nitrogen and indispensable for HCl-releasing to catalyze cellulose hydrolysis. Furthermore, CN-400· n HCl possesses excellent catalytic stability. Graphic Abstract Temperature-responsive acid-releasing catalysts provide a novel and green solid-liquid phase cellulose conversion reaction system.
研究领域:
生物质能
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催化化学
✓ 已验证
DOI
高影响因子
FUEL
·
2016
·
IF 3.611
Ting Liu,Changyong Man,Xin Guo,Chuguang Zheng
Experiments were conducted in a bench-scale fixed bed reactor with α-Fe 2 O 3 and γ-Fe 2 O 3 samples to investigate the mechanism of Hg 0 oxidation in the presence of HCl at 80–680 °C respectively. HCl is one of the main impurities in coal-derived fuel gas and its contribution to Hg 0 removal is complex and necessary to research. The experimental results showed that the Hg 0 removal mechanism with HCl could probably be divided into three stages based on the reaction temperature. At low temperature, the Eley–Rideal mechanism with HCl pre-adsorption was the most probable Hg 0 oxidation pathway. As the temperature increased more than 280 °C, Hg 0 removal efficiency differs significantly on α-Fe 2 O 3 and γ-Fe 2 O 3 , and the most suitable mechanism was Langmuir–Hinshelwood. With the increasing temperature to 680 °C, the homogeneous reaction between HCl and Hg 0 as well as Langmuir–Hinshelwood are responsible for the transformation of Hg 0 . We also discovered that the reaction time played a significant impact on the Hg 0 removal at low temperature, and caused the secondary mercury removal efficiency owing to the probable product of FeCl 3 . Additionally, HBr was adopted to compare with HCl, which obviously enhanced the Hg 0 oxidation on α-Fe 2 O 3 .
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Yu Chen,Xin Guo,Fan Wu,Yu Huang,Zhanchi Yin
Hematite (α-Fe 2 O 3 ) has been proved to be a promising sorbent for mercury removal in various situations. The mercury removal performance of α-Fe 2 O 3 was investigated using a simulated coal gasification syngas containing Hg 0 , N 2 , HCl, and/or H 2 S, a series of experiments were designed with HCl and H 2 S separately and both employed. For a better understanding in the interaction between HCl and H 2 S in mercury removal, the differences in mercury oxidation were demonstrated on the basis of density functional theory calculations. The rate-limiting step in HgCl 2 formation is Hg 0 → HgCl with the energy barrier of 139.47 kJ/mol, but for H 2 S in mercury oxidation, the generation of active sulfur species is the key step and the rate-limiting step is detachment of second H with an energy barrier of 57.53 kJ/mol. Experimental results point that HCl has inhibition on H 2 S for mercury removal, it may be ascribed to the competition of active Fe sites on Fe 2 O 3 . Conversely, HCl contributes to the mercury oxidation at high temperature while H 2 S has a limit effect at elevated temperature.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Tian Zhang,Limei Pan,Huan Tang,Fei Du,Yanhua Guo,Tai Qiu,Jian Yang
Herein, enhanced exfoliation and large-scale delamination of two-dimensional (2D) Ti 3 C 2 T x MXene using etchant of HCl + LiF, instead of HF, in which both etching and intercalation were achieved in exfoliation process, were thoroughly investigated with the focus on the effects of two critical factors, reaction temperature and washing solution. Increasing etching temperature promotes the exfoliation process, i.e., the transformation from Ti 3 AlC 2 to multilayer Ti 3 C 2 T x MXene, whereas simultaneously results in an aggravated surface oxidation of MXene layers formed after the extraction of Al. As a result, delamination ratio increases firstly and then decreases, and the samples etched at 35 °C show the highest delamination ratio. Compared with the distilled water, washing the exfoliation products using ethanol significantly improves the delamination ratio of Ti 3 C 2 T x MXene by co-intercalation of larger alcohol molecule and more impurity ions and a large scale delamination of Ti 3 C 2 T x MXene with a delamination ratio as high as 29.2% was obtained by simple sonication for 1 h, without additional intercalation step required, after washing using ethanol. The possible exfoliation reactions by HCl + LiF solution were proposed. Using the as-fabricated stable suspensions of delaminated Ti 3 C 2 T x flakes, flexible, free-standing Ti 3 C 2 T x papers with tailored thickness, hydrophilic surface and excellent conductivity, typically 2 × 10 5 S/m at 5 μm in thickness, were prepared. As anode for lithium ion batteries , the delaminated Ti 3 C 2 T x MXene obtained reversible capacities of 226.3 mAh g −1 , 137.9 mAh g −1 ,102.0 mAh g −1 and 47.9 mAh g −1 respectively at the current density of 100, 300, 1000 and 3000 mA g −1 , which are superior to those of the Ti 3 C 2 MXene prepared by conventional HF process.
研究领域:
材料科学
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能源存储
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Shaojian Jiang,Xi Liu,Hailong Li,Jun Wang,Zequn Yang,Haoyi Peng,Kaimin Shih
Elemental mercury (Hg 0 ) oxidation over a low-temperature La 2 O 3 -TiO 2 (LaTi) catalyst through a fixed-bed reactor system is reported here. Despite the presence of oxygen (O 2 ), Hg 0 was not effectively oxidized by either hydrogen chloride (HCl) or nitrogen oxide (NO). However, Hg 0 oxidation over the LaTi catalyst was greatly improved when both HCl and NO were present in the simulated flue gas. Several methods, including X-ray photoelectron spectroscopy (XPS), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, and temperature-programmed decomposition (TPD), were used to study the inherent mechanisms involved in the Hg 0 oxidation by HCl and NO. The results indicated that the combined presence of HCl and NO exhibited great synergy for Hg 0 catalytic oxidation over the LaTi catalyst. The reaction mechanism is proposed as follows: 1) NO was adsorbed and oxidized on the catalyst surface, forming NO 2 ; 2) the reactive NO 2 then oxidized gas phase Hg 0 to mostly HgO, and; 3) HgO reacted with gas phase HCl to produce HgCl 2 , which escaped from the catalyst’s surface. Differing from previously proposed mechanisms, La 2 O 3 was first studied as an active substance in Hg 0 oxidation. These findings are beneficial for those seeking economical and efficient Hg 0 oxidation catalysts for coal-fired power plants.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
Scientific Reports
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2024
·Vol. 14
·期 1
·1-14
·
IF 3.8
Shen Cong,Yan Jing,Ai Zhipeng,Huang Hongbing,Mo Lin,Liang Bangzhi,Zhang ChangHui
Adding corrosion inhibitors is considered to be a cost-effective way to inhibit metal corrosion. In this study, we report the synthesis of a bi-mannich base corrosion inhibitor (BMT) with an impressive inhibition efficiency on carbon steel in H 2 S and HCl co-existing solution. At the BMT concentration of 9 ppm, the inhibition efficiency (η) of 96.9%, 97.6% and 98.0% were determined by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy, respectively. The adsorption of BMT on the carbon steel surface follows the Langmuir adsorption isotherm, and the calculated free energy indicates that the adsorption is a spontaneous process. This research also delves into understanding the adsorption behavior and corrosion inhibition mechanism of BMT on carbon steel surfaces through quantum chemistry calculations. The results of this study provide guidance for the application of BMT as a corrosion inhibitor in sour and acid environments.
研究领域:
材料科学
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电化学
·
量子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
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IF 4.494
Binzhe Sun,Gege Peng,Lian Duan,Aihua Xu,Xiaoxia Li
A simple pretreatment method, NaOH swelling at a low temperature and then HCl regeneration, was developed for depolymerization of cellulose to glucose. Cellulose was transformed into amorphous hydrogel during the treatment; and due to the easy diffusion of H + and Cl − ions into the cellulose hydrogel network as well as the strong ability of Cl − to disrupt the massive hydrogen bond, the hydrolysis rate was greatly enhanced. The method is effective for α-cellulose, microcrystalline cellulose, filter paper, ramie fiber and absorbent cotton. Even at a high α-cellulose concentration of 50 g/L, 29.1% yield of glucose was still obtained within 10 min at 160 °C under microwave irradiation, where up to 16.2 g/L of glucose solution was given. The influence of NaOH concentration, HCl concentration, hydrolysis temperature and time on the hydrolysis rate was investigated. The structure of cellulose hydrogel was also studied to confirm the reaction mechanism.
研究领域:
生物化学
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可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xi Zhang,Yan Xu,Yong Zhou,Yinyan Gong,Yongli Huang,Chang Q Sun
An incorporation of the hydrogen bond (O:H O or HB) cooperativity notion, contact angle detection, and the differential phonon spectrometrics (DPS) has enabled us to gain refined information on the HCl, KCl and KOH solvation resolved solute-solvent molecular interactions and the solution surface stresses. Results show that ionic polarization stiffens the solvent H O bond phonon from 3200 to 3480 cm −1 in the hydration shells. The HO − in alkaline solution, however, shares not only the same H O phonon redshift of compressed water from 3200 to < 3100 cm −1 but also the dangling bonds of H 2 O surface featured at 3610 cm −1 . Salt and alkaline solvation enhances the solution surface stress by K + and Cl − ionic polarization. The excessive H + proton in acid solution forms a H↔H anti-HB that depresses the solution surface stress, instead. The solute capability of transforming the fraction of the O:H O bonds of the solvent matrix is featured by: f H = 0 and f x ∝ 1-exp(-C/C 0 ) (x = HO − , K + and Cl − ) towards saturation. Exercises not only confirm the presence of the H↔H anti-HB point fragilization, the O:⇔:O super-HB point compression, and ionic polarization dominating the performance of the respective HCl, KOH, and KCl solutions, but also demonstrate the power of the DPS that enables high resolution of solute-solute-solvent interactions and correlation between HB relaxation and solution surface stress.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yi Pan,Yu Liu,Xiaomin Zhang,Mingzhen Shi,Zhuoheng Tu,Xingbang Hu,Youting Wu
The exploiting of efficient, reversible and environmentally friendly hydrogen chloride (HCl) absorbent is of great significance for the recovery and high-value utilization of by-product HCl. Herein, we propose a new strategy to design deep eutectic solvents (DESs) with multiple-active-sites to effectively absorb HCl. Therefore, five new DESs were designed and prepared by pairing 1,3-dimethyl-2-imidazolidinone (DMI) with amide derivatives or LiCl. Among them, DMI + 1,3-dimethylurea (2:1) showed the unprecedented HCl capacity of 2.16 mol/mol at 303.2 K and 1 bar, surpassing that of water, DESs and ILs reported in literature. Spectroscopic characterization and quantum-chemical calculations showed that such high HCl capacity originates from multiple interaction sites between DESs and HCl. DMI + 1,3-dimethylurea (2:1) also exhibited the advantages of fast absorption of HCl, good recyclability, good selectivity and acceptable cost. A new reaction equilibrium thermodynamic model was developed to correlate HCl solubility data. The absorption rate of HCl in DESs was measured systematically for the first time. These DESs with multiple-active-sites offer improvements over commonly used absorbents, indicating the promise for industrial application in HCl separation and storage.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Fengshuang Han,Zhili Gong,Rui Wang,Sufang Dang
In this manuscript, the ability of (5-Benzoyl-1H-benzimidazol-2-yl) carbamicacidmethylester (mebendazole, MBD) as an inhibitor of corrosion on 5Cr pipeline steel in HCl medium was explored. Corresponding electrochemical tests, immersion tests and other experiments were designed, and at the same time, the ability of mebendazole to inhibit corrosion of 5Cr steel in HCl medium was screened and proved by means of molecular weight simulation calculation analysis process, and its possible anticorrosion mechanism was also revealed. Electrochemical test results show that mebendazole can successfully prevent 5Cr steel from dissolving in HCl medium, and the inhibition efficiency is particularly significant with the increase of mebendazole content. According to the electrochemical impedance test, the highest corrosion inhibition efficiency ( η ) can reach 94.4 %. The results of immersion weight loss experiment are highly consistent with the electrochemical test data and SEM electron microscope morphology. From the theoretical calculation results, it can be found that under neutral conditions and protonated mebendazole molecules have lower energy gaps and higher dipole moments in solvated and unsolvated environments, and can Parallel adsorption on the metal surface, which also corresponds to its efficient corrosion inhibition performance. In addition, through comparison, it is found that the protonated mebendazole molecule under solvation conditions has the highest binding energy, that is, it is the easiest to interact with 5Cr steel and presents the best anti-corrosion performance.
研究领域:
材料科学
·
电化学
·
防腐蚀工程
✓ 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）