MATERIALS RESEARCH BULLETIN
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2012
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IF 2.105
Pingyang Cai,Wei Bai,Lichun Zhang,Hongjie Song,Yingying Su,Yi Lv
In the present work, In 2 O 3 hierarchical hollow microsphere and flower-like microstructure were achieved controllably by a hydrothermal process in the sodium dodecyl sulfate (SDS)- N , N -dimethyl-formamide (DMF) system. XRD, SEM, HRTEM and N 2 adsorption measurements were used to characterize the as-prepared indium oxide materials and the possible mechanism for the microstructures formation was briefly discussed. The cataluminescence gas sensor based on the as-prepared In 2 O 3 was utilized to detect H 2 S concentrations in flowing air. Comparative gas sensing results revealed that the sensor based on hierarchical hollow microsphere exhibited much higher sensing sensitivity in detecting H 2 S gas than the sensor based on flower-like microstructure. The present gas sensor had a fast response time of 5 s and a recovery time of less than 25 s, furthermore, the cataluminescence intensity vs. H 2 S concentration was linear in range of 2–20 μg mL −1 with a detection limit of 0.5 μg mL −1 . The present highly sensitive, fast-responding, and low-cost In 2 O 3 -based gas sensor for H 2 S would have many practical applications.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yeshuang Wang,Mingxian Duan,Zhelin Su,Chao Yang,Yuxiao Wang,Tian Kou,Jiawei Kou,Huiling Fan
Cu–1,3,5-benzenetricarboxylate (Cu–BTC) exhibited potential for hydrogen sulfide (H 2 S) removal, however, its sulfur capacity is limited due to it relies only on the adsorption reaction path. Herein, a series of Fe-doped Cu–BTC materials (denoted as x Fe–Cu–BTC) were synthesized to enhance H 2 S removal capacity via a adsorption–oxidation bifunctional synergism mechanism. The prepared materials were characterized using various techniques, and their H 2 S removal performance was measured under dry and ambient conditions. The experimental results demonstrated that the 18%Fe–Cu–BTC shown the optimal breakthrough sulfur capacity of 122.8 mg S/g, marking a 2.1-fold and 10.3-fold improvement over pure Cu–BTC and Fe–BTC, respectively. The characterization analyses revealed that the Cu 2+ active sites initially react with H 2 S to form CuS, while the incorporated Fe 3+ sites trigger the oxidation of CuS, yielding elemental sulfur, Cu 2+ and Fe 2+ . The resultant Cu 2+ and Fe 2+ further engage in reactions with H 2 S to form CuS and FeS, thereby enhancing the H 2 S removal capacity via dual reaction pathways of adsorption and oxidation. Additionally, appropriate Fe doping increased the specific surface area and pore volume of Cu–BTC, which exposed more active sites and improved molecular diffusion. Based on the obtained findings, a plausible desulfurization mechanism involving adsorption and oxidation synergism for remove H 2 S was proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Li-Wen Mao,Li-Yuan Zhu,Tao Tao Wu,Lei Xu,Xuan-Hong Jin,Hong-Liang Lu
Heterostructured Nb 2 O 5 /SnO 2 core-shell nanorods are synthesized by a facile hydrothermal strategy and atomic layer deposition (ALD). The SnO 2 shell thicknesses varying from 7 to 34 nm exhibit a significant impact on sensing performance. The response enhancement mechanism of the Nb 2 O 5 /SnO 2 core-shell nanorods is illustrated based on the electron-depletion model. The Nb 2 O 5 /SnO 2 core-shell nanorods gas sensors were synthesized based on the micro-electromechanical systems (MEMS), which could provide variable operating temperatures for the gas sensors with highly integrated design and low power consumption. The response of the Nb 2 O 5 /SnO 2 core-shell nanorods gas sensor deposited with 20 nm SnO 2 shell towards 20 ppm H 2 S at 275 °C was 4.0, which showed a 3.8-fold of improvement compared with pristine Nb 2 O 5 nanorods. Furthermore, the well-structured core-shell nanorods gas sensors maintained stable performance after three months, presenting long-term stability and repeatability. The proposed Nb 2 O 5 /SnO 2 core-shell nanorods gas sensors demonstrate a potential strategy for the practical application in oil and gas drilling platforms and other industrial fields.
研究领域:
材料科学
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化学工程
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Xu Liu,Xuxu Zhai,Yuheng Zhao,Liang Shan,Zhongqing Liu,Yuefeng Liu
Sulfur element is widely applied as a non-metallic dopant into carbon framework for the modulation of their chemical activities. An interesting question is whether the intrinsic catalytic performances for the H 2 S selective oxidation to sulfur can be manipulated by sulfur element introduction into carbocatalysts. In this study, we employ a simple solvent-free method to introduce S atoms into framework of N-doped carbocatalysts, resulting in a notable enhancement of the product S selectivity with negligible loss of H 2 S selective oxidation. The experimental results show that the as-synthesized N-S-C-2 catalyst exhibits a H 2 S conversion of 97.5 % and sulfur selectivity of >80 % at a high O 2 -to-H 2 S ratio (2.5) under continuous mode (over the dew point temperature of sulfur, c.a. 210 °C), while also demonstrating robust stability (> 100 h), anti-CO 2 (up to 50 vol%) and anti-oxidation properties. Kinetic analysis and H 2 S/O 2 -TPD-MS results reveal that S introduction attenuates the adsorption and dissociation of H 2 S and O 2 by the N-doped carbon catalyst. Furthermore, density functional theory calculations elucidate that S doping elevates the adsorption energies of H 2 S and O 2 at the pyridinic N site, thereby moderately reducing the adsorption of H 2 S and O 2 , consequently preventing the over-oxidation of H 2 S to SO 2 and enhancing S selectivity. The double doping promotion effect of carbon materials reported in this investigation offers an alternative insight for the development of highly selective carbon desulfurization catalysts.
研究领域:
催化化学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yuchao Chen,Yubin Wang,Zifei Yan,Jian Deng,Guangsheng Luo
Efficient selective removal of H 2 S over CO 2 is the critical absorption process for the gas desulfurization in the petrochemical and refining industries. In this work, we tried to achieve high-selective removal of H 2 S from a mixed gas with CO 2 using a nonaqueous methyldiethanolamine solution in a membrane gas–liquid microdispersion microreactor. The influence of structural parameters and operation parameters on the removal efficiency of H 2 S and CO 2 were systematically investigated. In addition, the mechanism of selective absorption H 2 S over CO 2 was explained in detail. Furthermore, the selective absorption performance of the membrane microdispersion microreactor was compared with other devices. The results showed that the H 2 S removal efficiency and selective factor could be up to 99.4 % and 16.6, respectively. The selectivity factor of H 2 S to CO 2 in the membrane microdispersion microreactor is higher than that of most of reported devices. This work provides a promising selective absorption H 2 S device and technology for the process intensification of gas desulfurization.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Juanjuan Feng,Yu Tian,Kunlin Li,Fei Wang,Kai Li,Ping Ning
Toxic H 2 S limits the high-value utilization of high-concentration CO in yellow phosphorus tail gas. High-performance adsorbents play a significant role in the purification of yellow phosphorus tail gas and the recovery of CO. In this study, manganese-based adsorbents doped with other metals (Cu, Co, Ni, Ce, and Fe) were synthesized and tested for H 2 S removal. The results demonstrate that doping α-MnO 2 with metals significantly enhances its desulfurization performance. Notably, the 20 % Ni/Mn adsorbent achieves the best performance, exhibiting an adsorption duration of approximately 50 h under test conditions and H 2 S capacity up to 854.35 mg/g. Mechanism studies show that the performance improvement is mainly attributed to the doping of Ni, which disrupts the growth of the α-MnO 2 rod-like structure, promoting the formation of fine particles and exposing more crystal interfaces. This is conducive to the migration and release of active lattice oxygen species on the adsorbent, thereby enhancing the adsorption-oxidation performance of the adsorbent for H 2 S. Moreover, Ni significantly promotes the formation of high-valent Mn, enhancing the adsorbent’s oxidation capability and facilitating the decomposition of H 2 S. This study proposes an innovative synthetic strategy for constructing adsorbents with high H 2 S adsorption performance under anaerobic and dry conditions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2021
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IF 7.033
Jianan Chen,Jun Zhu,Wentao Xu,Yi Chen,Jicheng Zhou
Highly efficient H 2 and S production from copious waste H 2 S is beneficial from both environmental and energy. Whereas, the highly effective direct decomposition of H 2 S reaction faces a gigantic obstacle, that is, there is the severe thermal equilibrium limitation. Herein, a family of TiO 2 modified Mo x C as novel microwave catalysts have been developed. This work demonstrates that Mo 2 C, Mo 2 C-TiO 2 and MoC@TiO 2 microwave catalysts display excellent catalytic performance to recover both valuable H 2 and elemental S from the direct decomposition of H 2 S under microwave irradiation . The optimal H 2 S conversion of MoC@TiO 2 can be as high as 99.9% (almost complete conversion) at 700 °C, which greatly outpaces the corresponding H 2 S equilibrium conversion under microwave irradiation . This result of the chemical equilibrium limitation being broken shows an interesting phenomenon, namely a significant microwave selective catalytic effect by microwave catalysis in H 2 S decomposition reaction . In addition, the apparent activation energy of the Mo 2 C, Mo 2 C-TiO 2 and MoC@TiO 2 microwave catalysts reduced to 18.2 kJ/mol, 16.8 kJ/mol and 15.6 kJ/mol under microwave irradiation. The work supplies a strategy for highly effective valuable H 2 and S production from H 2 S decomposition reaction , and paves a path to high-value utilization of hazardous waste H 2 S resources with energy-saving heating method.
研究领域:
化学工程
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
Scientific Reports
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2017
·Vol. 7
·期 1
·1-10
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IF 4.259
Cui Guangliang,Zhang Pinhua,Chen Li,Wang Xiaoli,Li Jianfu,shi Changmin,Wang Dongchao
Gas sensors with high sensitivity at and below room temperature, especially below freezing temperature, have been expected for practical application. The lower working temperature of gas sensor is better for the manufacturability, security and environmental protection. Herein, we propose a H 2 S gas sensor with high sensitivity at and below room temperature, even as low as −30 °C, based on Cu 2 O/Co 3 O 4 nano/microstructure heteroarrays prepared by 2D electrodeposition technique. This heteroarray was designed to be a multi-barrier system, and which was confirmed by transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy and scanning probe microscopy. The sensor demonstrates excellent sensitivity, sub-ppm lever detection, fast response, and high activity at low temperature. The enhanced sensing property of sensor was also discussed with the Cu 2 O/Co 3 O 4 p-p heterojunction barrier modulation and Cu 2 S conductance channel. We realize the detection of the noxious H 2 S gas at ultra-low temperature in a more security and environmental protection way.
研究领域:
材料科学
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传感器技术
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
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2021
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IF 3.739
Yuejiao Jiao,Song Han,Weidong Zhang,Min Guo,Fangqin Cheng,Mei Zhang
In this study, adsorbents were self-assembled using CuO-loaded hollow microspheres. Adsorption tests for H 2 S in biogas were performed at room temperature under dry atmosphere. The specific surface area of the adsorbent is 270 m 2 /g, with an adsorption capacity as high as 51.87 mg H 2 S/g, attributed to the well-developed adsorbent pore volume of 0.932 cm 3 /g, wherein mesopores and macropores accounted for 99.14%. In addition, nano-CuO, with a particle size of 5.34 nm, is evenly dispersed on the whiskers of the hollow spheres. These factors provide a good environment for H 2 S adsorption from biogas. The regeneration rate of the adsorbent after the third and fifth regenerations was approximately 80% and 60%, respectively, suitable for the removal of H 2 S from biogas at room temperature under dry atmosphere.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Xiaona Huang,Hao Zhang,Xuguang Wang,Xiutian Yang,Rongzhuang Lin,Fan Zhang,Ying Liu,Kun Xu,Chao Zhou,Pixin Wang
During cementing construction, H 2 S gas leak from micro-cracks of cement ring or cementing interface, seriously damaging wellbore integrity and shortening the life of wells. Therefore, microcrack self-healing cement technology is of great significance for oil wells to maintain the durability of cement rings and adapt to complex underground environments. Herein, acrylamide (AM), acrylonitrile (AN) and N-vinylformamide (NVF) were used as functional monomers , and laponite was added to prepare Laponite-poly(acrylamide-acrylonitrile-n-vinylformamide) nanocomposite hydrogel (L-PMAN) with excellent mechanical strength as micro-crack repair agent for gas-triggered cementing cement sheath. Considering the difference of chemical environment in the process of wellbore cement slurry sealing and subsequent micro-fracture plugging, different structural units were selected to design amphoteric structure. The construction of zwitterionic structure makes it exhibit excellent swelling behavior in salt solution while maintaining 80% of the original mechanical strength. More importantly, after adding L-PMAN powder,cement stone (C 1 ) can achieve good repair of microcracks under the trigger of H 2 S within 3 days, and the maximum gas breakthrough pressure can reach 2.5 MPa, indicating the great potentials of the L-PMAN for plugging microcracks in cement sheath.
研究领域:
材料科学
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石油工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
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2024
·
IF 3.9
Lina Sun,Ping Ning,Jie Yang,Xin Song,Kai Li
This study used metal oxide-modified metal-organic frameworks to examine H 2 S catalytic oxidation selectivity. The findings revealed that the oxidation mechanisms and products differed between Fe 2 O 3 /UiO-66 and Al 2 O 3 /UiO-66. The dithionates were intermediate products of H 2 S oxidation on Al 2 O 3 /UiO-66, whereas the bisulfates were intermediate products on Fe 2 O 3 /UiO-66. Fe 2 O 3 /UiO-66 showed stronger surface oxidation activity than Al 2 O 3 /UiO-66. The formation of sulfate/SO 2 was primarily attributable to surface oxygen, whereas elemental sulfur was primarily related to lattice oxygen. The product generation processes of H 2 S on Fe 2 O 3 /UiO-66 and Al 2 O 3 /UiO-66 surfaces were as follows: H 2 S → HSO 4 2− → SO 2 → S for Fe 2 O 3 /UiO-66, while H 2 S → S 2 O 4 2− → SO 2 for Al 2 O 3 /UiO-66. H 2 O and surface oxygen have the potential to alter H 2 S adsorption on the catalyst surface. For Fe 2 O 3 , the conversion of H 2 S to SO 2 involves both an oxidation process and a reduction process. For Al 2 O 3 , the conversion of H 2 S to SO 2 includes two oxidation processes. Due to the oxidation step of S 2 O 4 2− limiting the generation of SO 2 , the reduction process of SO 2 was also hindered, which in turn restricted the production of S over Al 2 O 3 . Fe 2 O 3 can achieve the oxidation and removal of H 2 S at lower reaction temperatures, while also creating elemental S.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
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2018
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IF 3.024
XiangFeng Tian,LeMeng Wang,Dong Fu,Chao Li
The absorption performance of low-partial-pressure H2S in a monoethanolamine (MEA)-activated N-methyldiethanolamine (MDEA) aqueous solution was investigated. The absorption amount (in mass, g H2S/g solutions) and H2S loadings (mol H2S/(mol MEA + mol MDEA)) were measured, and the apparent absorption rate was determined from the time-dependent absorption capacity. Experimentally, the temperature and partial pressure of H2S (PH2S) ranged from 303.2 to 323.2 K and from 300 to 500 Pa, respectively. The mass fractions of MDEA (wMDEA) and MEA (wMEA) ranged from 0.30 to 0.50 and from 0 to 0.075, respectively. The temperature, wMDEA, wMEA, and PH2S dependencies of the absorption performance were analyzed. It is impressive that the addition of MEA significantly enhanced the absorption amount of H2S yet slightly influenced the apparent absorption rate. In addition, a tray column consisting of six plates was used to verify the removal efficiency of low-partial-pressure H2S (PH2S = 500 Pa) and the results showed that in the case of wMDEA = 0.5, wMEA = 0.075, and T = 313.2 K, the removal efficiency achieved 95% when the ratio of gas to liquid was 40, indicating that MEA-activated MDEA aqueous solutions are promising in the removal process of low-partial-pressure H2S.
研究领域:
化学工程
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环境科学
✓ 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）