CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Yajuan Ma,Bing Liu,Mengmeng Jing,Renyuan Zhang,Junyu Chen,Yuhua Zhang,Jinlin Li
In this work, we have prepared several kinds of potassium salts doped Ru/AC catalysts and systematically studied their catalytic activities towards water–gas shift (WGS) reaction. Activity testing indicated that K 2 CO 3 doped Ru/AC catalyst (Ru-K 2 CO 3 /AC) showed higher catalytic performance than KOH and KOAc doped Ru/AC catalysts, methane selectivity decreased most after doping KOH. Although the particle size of Ru nanoparticles in Ru-K 2 CO 3 /AC catalyst was larger than that of the parent Ru/AC catalyst, H 2 -TPR indicated that RuO x was reduced at much lower temperature, suggesting a weaker interaction between RuO x and the surface functional group of active carbon after the doping of K 2 CO 3 . Thus, Ru nanoparticles interacted stronger with the reaction molecules (CO and H 2 O), leading a higher catalytic activity. In addition, the doping of K 2 CO 3 on the surface of Ru/AC catalyst also increased the concentration of water around Ru active site due to the hygroscopic ability. Interestingly, it was also found that the prepared method also greatly affected the catalyst activity. If the active carbon was firstly coated with K 2 CO 3 , followed deposition of Ru metal nanoparticles, (called Ru/K 2 CO 3 -AC catalyst), the activity decreased remarkably as compared to Ru-K 2 CO 3 /AC. The low catalytic activity of Ru/K 2 CO 3 -AC was mainly due to the aggregation of Ru nanoparticles.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yapeng Tian,Chenhui Yang,Yi Tang,Yangyang Luo,Xiaojie Lou,Wenxiu Que
Supercapacitors with an advanced high volumetric energy density require a match of both electrodes materials and suitable electrolyte. Here, aqueous asymmetric supercapacitors are designed by employing layered Ti 3 C 2 T x as negative electrodes and highly compact activated carbon (AC) as positive electrodes. Ti 3 C 2 T x //AC asymmetric supercapacitors (Ti 3 C 2 T x //AC ASCs) with 1.7 V voltage window are designed by regulating the mass ratio of both electrodes, which results from the shift of the open circuit potential with different applied voltages. Then, dual-ion hybrid supercapacitors (Ti 3 C 2 T x //AC-KBr HSCs) are also constructed by introducing redox active (KBr) into traditional electrolyte (H 2 SO 4 ) for Ti 3 C 2 T x //AC ASCs to achieve a high volumetric energy density, in which fast hydronium ion intercalated pseudocapacitance happens at the Ti 3 C 2 T x negative electrode, while redox reaction of Br − /Br 3 − within the highly compact AC happens at the positive electrode. As a result, the Ti 3 C 2 T x //AC-KBr HSC achieves a high volumetric capacitance of 250 F cm −3 at 2 mV s −1 , a volumetric energy density of as high as 102.8 Wh L −1 at 424 W L −1 and an outstanding cycling stability with 122% capacitance retention after 6000 cycles. Furthermore, the self-discharge performance for the Ti 3 C 2 T x //AC-KBr HSC is obviously improved, which is mainly ascribed to the adsorption of oxidized species at the AC surface.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.112
Lei Shi,Liping Hu,Jing Zheng,Min Zhang,Jingli Xu
A specific metal organic framework (MOF) material was synthesized based on Ni(Ac)2 · 4H2O and 1-H-benzimidazole-5-carboxylic acid through hydrothermal method. It was a promising candidate as adsorbent due to its large surface areas, porous structure, ordering and controllable properties. In this paper, it was characterized by XRD, SEM, FTIR, TGA and N2 adsorption isotherm. Meanwhile MOF was treated as adsorbent for absorption of methylene blue. Using this material to remove methylene blue, which is low cost, simple and high efficiency. It shows great potential in removing other dyes and the adsorption rate could reach 85.08%.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Yan Xu,Yan Wang,Chenguang Wu,Huijiang Huang,Ying Zhang,Jun Nan,Haibin Yu,Yujun Zhao
Activated carbon with different microporous surface area were used to prepare a series of Ru/AC catalysts for the hydrogenation of dioctyl phthalate (DOP) to dioctyl 1,2-cyclohexanedicarboxylate (DOCH). The presence of micropores benefit the dispersion of Ru, but Ru particles encapsulated into the micropores can be hardly accessed by DOP molecule. An appropriate microporous surface area of the support should be crucial important for the preparation of highly efficient catalyst for phthalates hydrogenation. The as-prepared 0.45%Ru/AC-2 catalyst (Micropore surface area = 604 m 2 /g) exhibited the best activity in DOP hydrogenation with a TOF of 1406 h −1 due to its suitable micropore surface area.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2016
·
IF 2.322
Zhipeng Xie,Qi Su,Anhong Shi,Bin Yang,Baixiong Liu,Jianchai Chen,Xiaochun Zhou,Dingjian Cai,Liang Yang
A green low-cost redox flow battery using Zn/Zn 2+ redox couple in HAc/NaAc medium and Fe 2+ /Fe 3+ redox couple in H 2 SO 4 medium was first proposed and investigated for potential stationary energy storage applications . The presence of HAc/NaAc in the negative electrolyte can keep the pH between 2.0 and 6.0 even when a large amount of H + ions move into negative electrolyte from positive electrolyte through ion exchange membrane . In the pH range of 2.0–6.0, the chemical reaction of Zn species with H + species is very insignificant; furthermore, the electroreduction of H + ion on the negative electrode is significantly suppressed at this pH range. The zinc-ferrum redox flow battery (Zn/Fe RFB) operated within a voltage window of 0.5–2.0 V with a nearly 90% utilization ratio, and its energy efficiency is around 71.1% at room temperature. These results show that Zn/Fe RFB is a promising option as a stationary energy storage equipment.
研究领域:
能源科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Lihong Guo,Wenlei Xie,Chunli Gao
The heterogenization of Keggin-structure heteropoly acids (HPAs) has been proposed as a strategy to improve their application in biodiesel production in an attempt to comply the green and clean production demand. Herein, the commercial activated carbon (AC) was firstly modified with different metal ions (Cs + , K + and Ag + ), and then the H 6 PV 3 MoW 8 O 40 acid was incorporated into as-modified AC supports, so as to prepare HPAs-based solid catalysts. By screening tests, the 35%H 6 PV 3 MoW 8 O 40 /AC-Ag hybrid solid catalyst showed highly catalytic performance for transesterification of soybean oil. The best oil conversion of 91.3% was achieved under optimized conditions: methanol/oil molar ratio of 30:1, reaction time of 10 h, reaction temperature of 140 °C and catalyst dosage of 8 wt.%. Characterization results of XRD, IR, ICP and TG indicated that H 6 PV 3 MoW 8 O 40 was highly dispersed on the AC-Ag support as the loading was less than 35%. Proton exchange with Ag may contribute to the highly dispersion of H 6 PV 3 MoW 8 O 40 on the support and thus enhance the interaction of the heteropoly acids with the support, thereof leading to the increased catalytic stability. The as-prepared 35%H 6 PV 3 MoW 8 O 40 /AC-Ag catalyst was easily recycled and had good resistance to free fatty acid (FFA) and water, which were usually included in the low-quality oils. Moreover, as a bifunctional catalyst, the solid acid catalyst could simultaneously catalyze the transesterification of soybean oil and esterification of FFAs, and a probable mechanism of the catalytic process was also proposed. All the features of this novel solid catalyst are more advantageous than the homogenous H 6 PV 3 MoW 8 O 40 catalyst, successfully creating an efficient and sustainable approach of biodiesel production especially from the low-quality oils.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Kongsen Hu,Jiyuan Feng,Nan Lv,Zhiwei Lyu,Yuteng Zhang,Haifeng Zhang
Flexible pressure and movement sensors with dual-type signals have broad application potential in smart electronics and robotics. However, most devices usually require the assembly of various functional materials through a multistep and tedious process to realize the alternating current (AC) and direct current (DC) dual-mode output, resulting in difficult-to-control sensor volumes, complicated structures, and flexibility limitations. Here, we develop a dual-type signal pressure and movement sensor via fabricating the electrospun [polyvinyl pyrrolidone/polyaniline]//[polyacrylonitrile/barium titanate] ([PVP/PANI]//[PAN/BTO]) bifunctional Janus nanofiber films (BJNFF), which is able to generate AC or DC signals in different working modes. In working mode I, the BJNFF can produce an AC voltage signal (2.33 V N −1 ) for detecting vertical pressure. In working mode II, by moving Al over the BJNFF, the BJNFF can follow the dynamic Schottky contact to generate electron migration, thereby producing a DC output voltage signal for slip sensing. As a result, BJNFF utilizes the AC and DC conduction characteristics of the nanoresistance network to achieve AC/DC output compatibility in one integrated sensing material by one-step construction. Moreover, the BJNFF exhibits high sensitivity and maintains stability after reciprocating motion. These findings provide an efficient way for developing multifunctional sensors and achieving flexible smart electronics.
研究领域:
材料科学
·
电子工程
·
机器人技术
·
智能电子
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2025
·
IF 4.3
Rui Huang,Jingjing Xia,Yiding Wang,Zixuan Gao,Zeng Xue,Jinfeng Zhu,Ming Ming,Hongmin Zhao,Songxue Wang,Wenxiang Xia,Baoxiu Zhao
In this study, the CuO@ATT/AC catalyst was designed and synthesized by a simple process of immersion–doping–calcination to boost the catalytic performance toward peroxymonosulfate (PMS) and remove sulfadiazine (SDZ). The results of optimized preparation experiments indicated that the doping of the materials with AC markedly enhanced the activation of PMS, demonstrating not only superior catalytic performance but also a reduction in the leaching of Cu. The CuO@ATT/AC/PMS system achieved 96.5% SDZ removal within 60 min with only 0.03 mg/L of Cu leaching. In addition, the removal efficiency of SDZ reached above 90% across a wide pH range of 5–9 and operating temperature (25–35 °C). CuO@ATT/AC demonstrated exceptional stability and reusability, achieving a 95% removal rate for SDZ after five cycles. Furthermore, both radical and nonradical species were implicated in the degradation of SDZ. •OH, SO4•–, and 1O2 were identified as the primary reactive species involved in the system. This study presents an environmentally friendly and cost-effective composite catalyst for the degradation and elimination of organic contaminants in water.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Hongbin Yang,Haocong Li,Haizhuang Jiang,Yubin Zhang,Luyao Xing,Xin Kang,Huazheng Wang,Shuhe Zhang,Haobin Shi,Wanli Kang
Nanopolymer microspheres have been widely studied in the development of low-permeability reservoirs as an effective material to improve foam stability. However, there are few studies on the foam stability mechanism of nanopolymer microspheres. In this work, the effect of surface hydrophobicity of fluorescent nanopolymer microspheres PARC(Flu-Ac) on the stability of CO2 foam was investigated by using foam performance as an evaluation index. The mechanism of foam stabilization by PARC(Flu-Ac) with different degrees of hydrophobicity was clarified by studying the drainage rate, micromorphology, interfacial rheology of foam, and adsorption behavior of microspheres on the foam liquid film. The results show that PARC(Flu-Ac)-5 microspheres with neutral wettability have the best foam stabilization effect. At 94 °C, the foam volume of CO2 foam is 630 mL and the foam half-life is 30.12 min. PARC(Flu-Ac)-5 microspheres have a high desorption energy and can stably adsorb at the gas–liquid interface to form a solid layer. The microspheres improve the mechanical strength of the foam and reduce the direct contact of the fluid, thus providing space resistance for thinning the liquid film and the diffusion of gas between bubbles. In addition, the microspheres can slow the thinning rate of the liquid film through the release of free water. The stability of the foam is significantly improved. This study further clarifies the enhancement mechanism of nanopolymer microspheres on the stability of CO2 foam, which has excellent guiding significance for the application of CO2 foam in low-permeability oil fields.
研究领域:
石油工程
·
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 8
·2129-2137
·
IF 9.405
Di Liu,Ping Yang,Hao Zhang,Minjie Liu,Wenfei Zhang,Dongmei Xu,Jun Gao
A non-noble heterogeneous catalyst – a Co, N and C composite encapsulated carbon nanotube grown in situ on the surface of activated carbon (Co–N–C/CNT@AC) – was fabricated via the pyrolysis–reduction process. Co–N–C/CNT@AC catalyzed the reductive coupling of structurally diverse nitroarenes and alcohols to imines and secondary amines under exogenous base- and solvent-free conditions. BET, TEM, SEM, XRD and XPS characterization showed that the exceptional catalytic property of Co–N–C/CNT@AC could be explained by its nanostructure, Co–N and basic N species. Our protocol had advantages of low cost, environment-friendliness, and good applicability. Furthermore, a reaction route of nitroarenes, amines and alcohols as the starting materials was proposed to improve the atom economy of the reductive coupling of nitroarenes with alcohols.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Zhuo Wang,Bingshuo Li,Giuseppe Pipitone,Tianhua Yang,Jian Wang,Rundong Li
A significant amount of solid residue (SR) and aqueous phase (AP) by-products are typically generated during the hydrothermal liquefaction (HTL) of lignocellulosic biomass. AP often contains substantial quantities of harmful organic matter, which can cause environmental pollution if not adequately treated. Conversely, SR can be utilized as a low-grade solid fuel. Realizing the high-value utilization of this type of by-product not only contributes to mitigating environmental pollution but also improves the overall efficiency of biomass conversion and utilization. The objective of this paper is to valorize AP and SR to produce H 2 . SR obtained from the HTL of corn stalks was converted into activated biochar (AC) to prepare a Ni/AC catalyst for H 2 production from AP through aqueous phase reforming (APR). Through CO 2 activation, the specific surface area of AC reached 691 m 2 /g at an activation temperature of 900 °C and a residence time of 3 h. Using 6 wt% Ni/AC (1/60 g catalyst /mL AP ), H 2 yield reached 17.12 μmol/COD at 320 °C over 3 h, approximately 6-fold of the non-catalyzed reaction, while the COD removal reached approximately 38 %. In the gaseous product, the composition of H 2 , CO, CH 4 , CO 2 was 31.69, 1.51, 0.67 and 66.13 vol%, respectively. In view of the adverse effect of the high COD value of AP on APR, reducing ketones, acetylenes and esters may improve the hydrogen production efficiency of the reaction system. Valorization of SR and AP for H 2 production contributes to enhancing the overall energy conversion of biomass HTL.
研究领域:
能源化学工程
·
环境科学与工程
·
生物质转化
·
催化科学与技术
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2026
·Vol. 17
·期 8
·966
·
IF 3.5
Ke Wang,Mingna Xie,Yuyang Zhao,Jiuyi Wang,Leilei Zeng,Xiaogang Lin,Jie Jayne Wu
Acrylamide (AA) is a common contaminant in foods processed at high temperatures and has attracted significant attention due to its potential neurotoxicity and carcinogenicity. Therefore, the development of a highly sensitive, highly selective sensing technology suitable for on-site detection is of great importance for ensuring food safety. In this study, an aptamer (Apt)-based capacitive AA sensor was developed based on the alternating current electrokinetics (ACEK) effect. The sensor utilizes an aptamer as the biomimetic recognition element, which can specifically recognize AA, thereby enabling quantitative detection. Additionally, a detachable detection fixture and data acquisition system were designed to enhance the detection stability and convenience of sensor. Within the linear range of 1 nmol/L to 10 µmol/L, the sensor response (dC/dt) exhibited a good linear relationship with AA concentration, with a detection limit as low as 0.4235 nmol/L. The sensor exhibits good selectivity toward structural analogs of AA, with a recovery relative standard deviations (RSDs) of less than 5.42% in spiked coffee samples. This portable detection system provides a sensitive and user-friendly tool for the analysis of acrylamide in food and holds great potential for application in food safety.
✓ 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）