Asia-Pacific Journal of Chemical Engineering
·
2024
·
IF 1.4
Bo Wang,Pei-ya Li,Shu-han Lu,Bin Wang,Fusheng Yang,Tao Fang
Liquid organic hydrogen carrier (LOHC) technology has unique advantages in hydrogen storage and transportation. However, the lack of research on the continuous dehydrogenation process of LOHCs has hindered the design and application of industrial dehydrogenation processes. In this work, a highly active dehydrogenation catalyst 1.5 wt% Pd/activated carbon (Pd/C) and a commercial catalyst 5 wt% Pd/Al 2 O 3 were used for the continuous dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NEC). Based on a tubular reactor and lab-scale apparatus, 1.5 wt% Pd/C catalyst achieved a maximum dehydrogenation conversion of 98.3% and a maximum NEC selectivity of 95.3%, while dehydrogenation conversion and NEC selectivity with 5 wt% Pd/Al 2 O 3 were 98.3% and 97.6%, respectively. It showed the equally excellent performance between Pd/C and Pd/Al 2 O 3 , and the former has less Pd loading than the latter, with the potential of reducing the production cost of the dehydrogenation catalyst. The dehydrogenation results also indicated the difference in catalytic performance between the two kinds of catalysts. The obtained kinetics data were analyzed, and the dynamics of continuous dehydrogenation were studied to provide fundamental information for dehydrogenation scale-up.
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Reaction Kinetics Mechanisms and Catalysis
·
2024
·Vol. 137
·期 3
·1667-1682
·
IF 1.7
Niu Menglong,Pan Liuyi,Ji Panpan,Liu Ning,Ge Yiqing,Niu Ben,Ma Baoqi
This study investigates the synergistic effect during the co-hydrogenation process of coal tar and biomass oil through experiments. By conducting hydrogenation experiments on model compounds of coal tar (naphthalene, tetrahydronaphthalene, decalin, and 9,10-phenanthrene) and waste soybean oil, it was found that partially saturated and fully saturated polycyclic aromatic hydrocarbons release active hydrogen atoms due to dehydrogenation at high temperatures. These active hydrogen atoms can promote the hydrogenation conversion of fatty acids derived from triglycerides in waste soybean oil during the co-hydrogenation process with coal tar. Through co-hydrogenation experiments of coal tar and waste soybean oil, it was discovered that when coal tar was first hydrogenated under conditions of temperature of 360 °C, pressure of 8 MPa, and LHSV (liquid hourly space velocity) of 0.4 h −1 , and then mixed with waste soybean oil (at a concentration of 30 g/100 mL) for hydrogenation under the conditions of temperature of 360 °C, pressure of 8 MPa, and LHSV of 0.4 h −1 , the deoxygenation conversion rate of fatty acids in the soybean oil is 94.5%. The hydrogenation deoxygenation conversion rate of the product in this process was 87.5% higher than that of individual fatty acids. This study indicates that the co-hydrogenation of hydrogenated coal tar and bio-oil promotes the deoxygenation conversion of bio-oil.
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JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Yali Yang,Jia Chen,Xiaojing Liang,Bei Liu,Kaijun Quan,Xiuhui Liu,Hongdeng Qiu
In this paper, three imidazole- and C18- bifunctional silica stationary phases (Sil-Im-C18) were prepared by adjusting introduction interval of octadecyltrichlorosilane (ODS) and 3-imidazol-1-ylpropyl(trimethoxy)silane (TMPImS), which can be used for reversed-phase liquid chromatography (RPLC) and ion exchange chromatography (IEC) with adjustable performance. The successful preparation of Sil-Im-C18 were confirmed by the characterizations of elemental analysis, infrared spectroscopy (FTIR) and contact angle (CA). Chromatographic performance of Sil-Im-C18 were evaluated by the separation of Tanaka test mixture, alkylbenzenes, linear PAHs and a set of analytes with different properties (uracil, phenol, 1,2-dinitrobenzene and naphthalene), and compared with commonly used C18 column. It was found that the chromatographic performance of Sil-Im-C18 changed significantly with the difference in bonding amount of imidazole and C18. Sil-Im-C18 demonstrated the excellent separation performance towards polycyclic aromatic hydrocarbons (PAHs), phenylesters, phenylamines , phenols and inorganic anions, and notably, nucleobases and nucleosides can be separated using pure water as mobile phases . The van Deemter plot showed that the column efficiency of Sil-Im-C18-3 was 64,933 plate· m − 1 for naphthalene, indicated that Sil-Im-C18 was reasonably chromatographic columns. The RSD values of retention time were 0.22 %-0.61 % for 10 needles alkylbenzenes injected continuously at 50 °C to investigate thermal stability and repeatability, all the fluctuations of k of naphthalene were less than 2.3 % for Sil-Im-C18-1 during flushing 24 h with the mobile phase at different pH values (pH = 3 and 8), the retention time of alkylbenzenes were almost same for Sil-Im-C18-1 at different time, the RSD values of retention time of alkylbenzenes were 0.45 %-2.28 % for two batches Sil-Im-C18-1, revealing the excellent repeatability, thermal stability, durability and reproducibility of Sil-Im-C18, and implying a commercial prospect.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yuqian Li,Haomin Chen,Wei Li,Beidou Xi,Caihong Huang
The remediation of sites co-contaminated with polycyclic aromatic hydrocarbons (PAHs) and heavy metals (HMs) poses challenges for efficient and ecofriendly restoration methods. In this study, three strains ( Pseudomonas sp. PDC-1, Rhodococcus sp. RDC-1, and Enterobacter sp. EDC-1) were isolated from sites contaminated with PAHs and HMs. The constructed bacteria consortium was then immobilized using biochar, bentonite, and peat. The immobilized bacteria consortium (IBC) demonstrated efficient removal ability of phenanthrene (58.1 %-73.4 %) and benzo[ a ]pyrene (69.6 %-83.5 %) during 60 days. Additionally, the IBC decreased soil bacterial richness and diversity, but increased the relative abundance of Proteobacteria phylum and Ochrobactrum genus, which were capable of degrading PAHs. Soil microbial co-occurrence network with IBC was classified into three main modules, and 14 genera were identified as keystone taxa linked to PAHs degradation and HMs resistance. The IBC enhanced the dioxygenase metabolic pathways for PAHs degradation, including phthalic acid and salicylic acid pathways, which became the main driving factor affecting PAHs removal efficiency based on the structural equation modeling analysis. This study confirmed the potential application of the constructed IBC in the bioremediation of soil co-contaminated with PAHs-HMs, and provides insights into key removal mechanism and main driving factor of the enhanced elimination of PAHs.
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Weibo Wu,Wenfeng Zhao,Chengjiang Fang,Zhongwei Wang,Tingting Yang,Hu Li,Song Yang
Selective hydrogenation of furfural (FUR) derivable from pentose is one of crucial route to upgrade biomass. In this work, a rapid and mild approach has been developed for the quantitative production of furfuryl alcohol from FUR at room temperature in several minutes as short as 5 min with the presence of readily available KF and polymethylhydrosiloxane (PMHS) that is a nontoxic and cheap liquid H-donor. This catalytic system was also active for the selective hydrogenation of various aldehydes in high yields, and could be recycled with little decrease of activity. In addition, the reaction mechanism was clarified by NMR spectra.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Zichen Zhao,Ruiyang Ma,Juntao Wang,Qing Zhang,Miao Jing,Chun Wang,Qiuhua Wu,Zhi Wang
A boric acid functionalized hyper-crosslinked polymer (HCP), designated as NPCBA/TBM-HCP, was successfully synthesized via Friedel-Crafts reaction by copolymerizing N-phenylcarbazole-2-boronic acid (NPCBA) and 2,4,6-Tris(bromomethyl)mesitylene (TBM). The NPCBA/TBM-HCP showed a large surface area and a good adsorption property for phenylurea herbicides (PUHs). A method with NPCBA/TBM-HCP based solid phase extraction and high-performance liquid chromatographic detection was developed for the simultaneous analysis of PUHs in lake water, green tea drink and tomato samples. Under the optimized experimental conditions that the amount of the NPCBA/TBM-HCP was 30 mg, sample solution was 100 mL, sample loading rate was 4 mL min -1 , and eluent was 0.3 mL acetonitrile, the linear response for the PUHs was in the range of 0.06–80.0 ng mL -1 , 0.6–80.0 ng mL -1 and 0.9–200 ng g -1 for lake water, green tea drink and tomato samples, respectively, with a good linearity (the coefficients of determination ( r 2 ) ≥ 0.9916). The detection limits (S/N = 3) for lake water, green tea drink and tomato samples were 0.02–0.03 ng mL -1 , 0.2 ng mL -1 and 0.3–0.5 ng g -1 , respectively. The method recoveries for spiked samples were 80.0 %-119.1 % and RSDs were lower than 9.9 % for the determination. The method provides a new and feasible approach for the determination of phenylurea herbicide in real samples.
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JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Huifeng Deng,Yanqun Yang,Jianbin Ju,Yu Jiang,Xiaowen Huang,Zhenyu Li,Rui Shi,Guihua Ruan,Yipeng Huang
In this study, 4-vinylphenylboronic acid, ionic liquid, and dipentaerythritolhexakis(3-mercaptopropionate) were used as functional monomers to prepare monolithic column in fused-silica capillaries by thermally induced sulfhydryl-alkenyl click polymerization. Based on the properties of 4-vinylphenylboronic acid and ionic liquid, the monolithic capillary column (VPBA-SH-IL) exhibited excellent permeability and chemical stability with the ability to efficiently enrich trace amounts of cytokinins from complex substrates via B←N coordination, π-π interactions, cation-π interactions, S-π interactions and hydrophobic interactions. Under the optimal adsorption conditions, the adsorption efficiency of VPBA-SH-IL for six cytokinins could reach more than 95 %, and the adsorption capacities ranged from 0.18 to 0.99 mg·m −1 . A reliable and sensitive method for the determination of six cytokinins in organs of tomato (root, stem, leaf and fruit) was established by using the monolithic capillary column as in-tube solid-phase microextraction coupled with UHPLC-MS/MS. The developed method showed a wide linear range (0.010–10.0 μg·L −1 ) and low limits of detection (1.6–3.3 ng·L −1 ). The recoveries of the six cytokinins in spiked samples ranged from 80.6 % to 108 % with the relative standard deviations of 2.4–8.7 % ( n = 5). The VPBA-SH-IL shows good potential for extraction and analysis of trace cytokinins in complex matrices such as plants, which is of great significance in exploring the mechanism of plant growth and development.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chunyan Liu,Yanjuan Liu,Yuefei Zhang,Wei Chen,Sheng Tang
In this work, zeolitic imidazolate framework-67 (ZIF-67) with excellent stability synthesized at room temperature was used together with amphiphilic polymer hydrogel to synthesize a captivating mixed-mode silica stationary phase for the first time. The amphiphilic polymer hydrogel prepared by weakly basic cationic and acidic anionic monomers that was modified on the surface of ZIF-67@SiO 2 by a simple physical coating method not only improved the separation performance, but also enhanced the applicability of ZIF-67@SiO 2 in chromatographic analysis. Meanwhile, the porous ZIF-67 effectively alleviated the problem that polymer hydrogel was easy to swell. To sum up, the amphiphilic polymer hydrogel and ZIF-67 showed excellent synergistic effect in improving the separation ability and the applicability of stationary phase. The experimental results demonstrated that the ZIF-67/hydrogel@SiO 2 stationary phase could be applied in various chromatographic separation modes, demonstrating superior resolution and separation selectivity for polycyclic aromatic hydrocarbons, steroid hormones, nucleosides, B-vitamins, sulfonamides, benzoic acids and dinitrobenzene isomers. In this study, the synergistic expression of ZIF-67 and polymer hydrogel provided a new idea for the development of silica stationary phase co-modified by metal-organic framework and hydrogel material. Concurrently, the successful preparation of ZIF-67/hydrogel@SiO 2 composite revealed a new possibility for utilizing ZIF-67 as the functional material of stationary phase, expanding the application potential of ZIF-67 in the field of chromatography.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Xiaomei Yang,Ziqing Huang,Zhihao Chen,Zhongcheng Guo,Shuang Wang,Chen Chen,Fayi Wang,Lipeng Zhou
Crystal size is one of the most important parameters of zeolite, which greatly affects its properties and performance. Here, the crystal size of Sn-Beta synthesized by hydrothermal route was tailored by adjusting the amount of crystal nuclei in the gel. Si-Beta that was treated with tetraethylammonium hydroxide (TEAOH) was used as the seed for synthesizing Sn-Beta. The seeds were studied by FT-IR, SEM, XRD and laser particle size analysis. It was found that the crystal size of the synthesized Sn-Beta depended on the concentration of TEAOH. Sn-Beta with minimum crystal size (about 500 nm) can be obtained using 0.5 mol L –1 TEAOH. Additionally, the crystal size distribution of Sn-Beta synthesized by the supernatant as seed was narrower than that synthesized by the solid residue as seed. The catalytic performance of Sn-Beta was tested in the conversion of ethyl levulinate to γ-valerolactone by Meerwein-Ponndorf-Verley reduction. Sn-Beta with small crystal size showed higher catalytic activity.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-15
·
IF 15.7
Bai Yang,Meng Yuanyuan,Yang Ming,Tian Ruijia,Wang Jingnan,Jiao Boxin,Pan Haibin,Gao Jiangwei,Wang Yaohua,Sun Kexuan,Zhou Shujing,Lu Xiaoyi,Song Zhenhua,Liu Chang,Ge Ziyi
All-perovskite tandem solar cells (PTSCs) offer a promising approach to surpass the Shockley-Queisser (SQ) limit, driven by efficiently reducing thermalization and transmission losses. However, the efficiency and stability of the narrow-bandgap (NBG) subcells, which are essential for PTSC performance, remain severely constrained by challenges such as lattice instability, strain accumulation and halide migration under illumination. This study introduces a rigid sulfonate-based molecule, sodium naphthalene-1,3,6-trisulfonate (NTS), into tin-lead (Sn-Pb) perovskites, where it strengthens the Sn-I bond through Sn-trisulfonate coordination and reduces light-induced dynamic lattice distortions via the rigid NTS backbone. These molecular interactions alleviate strain heterogeneity within the lattice and homogenize the Sn-Pb compositional gradient, thereby enhancing the structural integrity and long-term stability of Sn-Pb perovskites under operational conditions. As a result, Sn-Pb single-junction perovskite solar cells (PSCs) achieve a power conversion efficiency (PCE) of 23.2%. When integrated into a tandem configuration, the device attains an impressive PCE of 29.6% (certified PCE of 29.2%, one of the highest certified efficiencies to date), with 93.1% of the initial efficiency retained after 700 h of continuous operation. By stabilizing the lattice structure, this work lays a solid foundation for achieving both high efficiency and long-term durability in next-generation perovskite photovoltaics.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Zhipeng Zhu,Min Zhang,Xiaohui Yan,Chenglong Shi,Bin Wang,Yanshuo Li,Dapeng Wu
A crosslinked polystyrene-divinylbenzene (PS-DVB) stationary phase was prepared onto silica gel with the pore size of 100 Å and 300 Å (SiL-PSD-10, SiL-PSD-30) by surface-initiated atom transfer radical polymerization (ATRP) for high performance liquid chromatography (HPLC) separation of alkylbenzenes, fullerites, and proteins, respectively. The SiL-PSD coating and the pore size distribution were characterized by FT-IR, TGA, and nitrogen adsorption-desorption isotherms. The crosslinking degree within stationary phase was determined in good consistency with the feeding ratio, as confirmed by RP-HPLC. It was found the SiL-PSD-10 particles could resist the harsh etching of 0.1 M NaOH for at least 6 h, while bare silica was totally dissolved and commercial C18 silica was partially dissolved under the same conditions. Under alkaline conditions (pH 11), the column bleeding rates of SiL-PSD-10 were reduced by 83 % and 96.0 % respectively compared to commercial C18 column and bare silica. Under accelerated aging conditions, SiL-PSD-10 maintained over 94 % of its initial column efficiency after exposure to 16,000 column volume of mobile phase. On SiL-PSD columns, alkylbenzenes could be separated in reversed-phase mode, and fullerite (C 60 /C 70 ) could be baseline resolved within 2 min with benzene as the mobile phase. During the continuous monitoring for 70 h, RSDs of the retention times of proteins were between 0.49 % and 1.19 %. Generally, SiL-PSD had been demonstrated to combine the excellent mechanical strength and uniform porosity of silica gel with the outstanding chemical resistance of PS-DVB, and could be used for HPLC separation across a wider pH.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Zhiping Zhao,Chunfeng Zhang,Xiaojun Zhang,Qiong Tang,Lei Liu,Jinxiang Dong
Nano-silica grease (NSG), an innovative lubricant, is commonly synthesized using base oil thickened with SiO 2 , the choice of appropriate base oil is crucial for obtaining superior performance NSG. Herein, a series of alkylnaphthalene (AN) base oils with different side-chain lengths were synthesized through the alkylation reaction between naphthalene and α-olefin. We first reported the synthesis of NSGs based on the AN base oils, and investigated the influence of the synthetic AN base oils on the rheological behaviors and tribological characteristics of the resulted NSGs. The results indicated that the structural strength of the grease increased as the alkyl chain length rose because it reinforced the contact between the alkylnaphthalene base oil and nano-silica thickener. Meanwhile, tribological tests were conducted to examine the effect of various AN base oils on the lubricating performance of the formed NSGs. The tested results showed that increasing the side chain length of the AN could elevate the friction-reducing and anti-wear properties of the NSG.
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