Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 35
·18486-18493
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IF 8.867
Fei Wang,Gang Guo,Sheng-Jun Luo,Rong-Bo Guo
Sodium dodecyl sulfate (SDS) has been reported to be the most efficient promoter for hydrate-based natural gas storage and transportation, however, foam generation during hydrate dissociation seriously affects its application. Nano-metal particles have also been demonstrated to be efficient promoters, nevertheless their poor stability is a serious problem. In this work, we first fixed –SO3− groups (similar to the hydrophilic group of SDS) covalently on polystyrene through soap-free emulsion polymerization to synthesize –SO3−-coated nanopolymers, and by tuning their morphology they existed as amorphous polystyrene macromolecules (–SO3−@PSMM) or uniform polystyrene nanospheres (–SO3−@PSNS). Afterwards, we grafted nano-Ag particles with the size of 2–5 nm on the –SO3−-coated nanopolymers through electrostatic adsorption and in situ reduction to prepare Ag&–SO3−-coated nanopolymers (denoted as Ag&–SO3−@PSMM and Ag&–SO3−@PSNS), which were then used for the first time to promote methane hydrate formation. When 0.5 mmol L−1 amorphous Ag&–SO3−@PSMM was used at an initial pressure of 6 MPa and temperature of 275.15 K, the induction period was 32.2 ± 7.9–60.8 ± 14.2 min, the growth period was 108.8 ± 8.2–177.1 ± 38.9 min and the methane storage capacity reached 143.9 ± 3.7–145.2 ± 1.2 v/v, whereas when the spherical Ag&–SO3−@PSNS was used at 0.5 mmol L−1, the induction period and growth period were 17.8 ± 2.8–38.5 ± 8.0 and 39.6 ± 2.8–42.1 ± 0.9 min, respectively; and the storage capacity reached 149.3 ± 1.2–151.3 ± 3.0 v/v, indicating that Ag&–SO3−@PSNS were much better promoters compared with Ag&–SO3−@PSMM. Moreover, Ag&–SO3−@PSNS exhibited excellent recycling performance for 10 cycles of methane hydrate formation–dissociation. To sum up, the Ag&–SO3−-coated nano-promoters developed in this work showed significant potential in achieving the industrial application of hydrate-based natural gas storage and transportation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Lijian Wang,Yanqun Zhu,Hui Yang,Yong He,Jun Xia,Yanwei Zhang,Zhihua Wang
The effect of several catalyst supports with large specific surface area (such as SiC, Al 2 O 3 , SiC–Al 2 O 3 –ball, and SiC–Al 2 O 3 ) on catalytic activity was evaluated in this study. CuO–CeO 2 supported on SiC–Al 2 O 3 exhibited high stability and activity, which was considerably close to the thermodynamic equilibrium curve at 625 °C during the stability test for 50 h. The SO 3 decomposition temperature decreased from 750 °C to 625 °C. SiC–Al 2 O 3 contained numerous micropores and mesopores and had a large specific area, indicating strong adsorption, as determined by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and nitrogen adsorption measurement. X-ray photoelectron spectroscopy (XPS) revealed that the surface of SiC–Al 2 O 3 consisted of Al 2 O 3 , SiC, and SiO 2 and that the cerium oxide surface had the largest number of defects. Temperature-programmed reduction (H 2 -TPR) results indicated that the cerium–copper oxides on the surface of powdered SiC–Al 2 O 3 had the strongest redox potential and that CuO had the lowest reduction temperature.
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CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Ziyu Qin,Li Ji,Xueqiong Yin,Li Zhu,Qiang Lin,Jinming Qin
Various sodium bacterial cellulose sulfates (SBCS) were prepared via the homogeneous sulfation of bacterial cellulose (BC) with a SO 3 /pyridine (Py) complex in a dimethyl acetamide/lithium chloride solution. The SBCSs were characterized using Fourier transform infrared spectroscopy, X-ray diffraction (XRD), carbon nuclear magnetic resonance spectroscopy, gel permeation chromatography, elemental analyses, and thermal gravimetric analyses. A variety of conditions (including various amounts of SO 3 /Py, temperatures, and reaction times) were utilized to obtain SBCSs with DS values that ranged from 0.10 to 1.50. The XRD profiles indicated that the SBCSs had a cellulose II analog polymorphous structure. The differences between BC and microcrystalline cellulose (MC) were studied in their respective reactions. BC is more reactive than MC in both the sulfation and depolymerization processes. The order of reactivity for C OH is C6 > C2 > C3 for both BC and MC. Cellulose sulfates with DS values >0.31 were soluble in deionized water.
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Molecular Catalysis
·
2025
·
IF 4.9
Long-Gen Hu,Guo-Sheng Zhang,Guang-Hui Shi,Jian-Guo Qian,Hai-Jing Wang,Ye Liu
The Pd-catalyzed aminocarbonylation as well as hydroxycarbonylation of terminal alkynes was achieved with aid of a sulfonate-built-in zwitterionic phosphine ( L2 ), under acid-additive free condition. With L2 -Pd(OAc) 2 catalytic system, the terminal alkynes smoothly converted to the corresponding α,β -unsaturated carbonyl compounds (amides or carboxylic acids) in moderate to excellent isolated yields, with 100 % branched regio-selectivity. It was believed that L2 with the matched steric-demand and the bulit-in-SO 3 - -unit not only tuned the catalytic performance of Pd(OAc) 2 to activate CO and alkyne but also exhibited the synergetic activating ability towards the nucleophiles of (primary/secondary) amines or H 2 O via developing hydrogen-bond interaction, which facilitated the observed successful carbonylation. It means the developed L2 -Pd(OAc) 2 system could serve as a bifunctional catalyst.
研究领域:
有机化学
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催化化学
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配位化学
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合成化学
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物理有机化学
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Quantao Cui,Yuyin Dong,Weiwei Zou,Ziyu Song,Wei Zhang,Qiting Zuo,Xiaoli Zhao,Fengchang Wu
Sulfite-based advanced oxidation technology has received considerable attention for its application in organic pollutants elimination. However, the potential of natural sediments as effective catalysts for sulfite activation has been overlooked. This study investigates a novel process utilizing suspended sediment/sulfite (SS/S(IV)) for degradation of metronidazole (MNZ). Our results demonstrate that MNZ degradation efficiency can reach to 93.1 % within 90 min with 12.0 g SS and 2.0 mM sulfite. The influencing environmental factors, including initial pH, SS dosage, S(IV) concentration, temperature, and co-existing substances were systematically investigated. Quenching experiments and electron paramagnetic resonance analyses results indicate that SO 3 •− is the primary active substance responsible for MNZ degradation, with involvement of SO 4 •− , SO 5 •− , and • OH. X-ray photoelectron spectroscopy and Mössbauer spectra reveal that Fe (III)-silicates play a crucial role in activating S(IV). Furthermore, analysis of degradation intermediates and pathways of MNZ is conducted using liquid chromatography with mass spectrometry (LC -MS). The toxicity of MNZ and its intermediates were also systematically evaluated by the T.E.ST. program and wheat seeds germination test. This study offers valuable insight into the activation of sulfite by natural sediments and could contribute to the development of SS-based advanced oxidation processes (AOPs) for the in-situ remediation of antibiotics-contaminated water environments.
研究领域:
环境科学
·
水处理
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污染物降解
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催化
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CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Xinyu Ai,Leipeng Li,Xue Zhou,Zhiguo Zhang
For understanding the SO 3 emission level in coal-fired power plants to indicate the operating status of the SCR, a sulfate monitoring method based on ultraviolet absorption spectroscopy was proposed to feedback SO 3 concentration. By measuring the absorption spectrum of sulfate, the red shift of the absorption peak was observed when the concentration was higher than 0.01 mol/L. Through optimization, a spectral range for sensitive detection of sulfate was obtained. A quadratic function was given for fitting the relationship between sulfate concentration and ultraviolet absorption. The minimum detection limit of sulfate was determined to be 9 × 10 -5 mol/L.
研究领域:
环境监测
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电厂排放
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光谱分析
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Changhui Zhou,Jinhua Li,Yan Zhang,Jing Bai,Pengbo Wang,Bo Zhang,Lina Zha,Mingce Long,Baoxue Zhou
Sulfurous and nitrogenous oxides, including NO x and SO 2 , and the generated substances NO x - and SO 3 2- widely exist in air and water as pollutants and thus are difficult to control in the environment. In this study, we designed a novel photoelectrocatalytic (PEC) system for the efficient conversion of SO 2 and NO x in mixed gases and NO x - and SO 3 2- in wastewater to N 2 and SO 4 2- , respectively, by activating SO 3 2- to form SO 3 • - . The key ideas include the conversion of SO 3 2- from SO 2 and efficient activation of SO 3 2- into SO 3 • - and further conversion into SO 4 • - by the MoS 2 /Fe 2 O 3 photoanode. Simultaneously, NO 3 - /NO 2 - originating from NO x was rapidly reduced to NH 4 + on the CuNW@CF cathode. Ultimately, the generated NH 4 + was selectively oxidized to N 2 by SO 4 • - and SO 4 • - was reduced to SO 4 2- . The results indicated that 99.9 % of TN was removed and 100 % of SO 3 2- was converted to harmless SO 4 2- . This study provides new insights into the treatment of sulfurous and nitrogenous oxides in air and water.
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