CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Rongxue Li,Hongdan Wu,Yuqing Sun,Zhihui Zhou,Shiyi Wang
To overcome the limited permeance of conventional γ-Al 2 O 3 nanofiltration (NF) membranes caused by sol penetration into porous supports and poor interfacial defect control, a single-calcination fabrication strategy incorporating a PVA sacrificial interlayer was developed in this study. This approach enabled simultaneous structural optimization and performance enhancement, while also simplifying the overall fabrication process. At a PVA concentration of 3 wt% and a pre-filling time of 2 min, the average pore size of the γ-Al 2 O 3 separation layer increased from 2.04 to 2.39 nm, and the pure-water permeance improved from 8.22 to 17.68 L m −2 h −1 ·bar −1 . This enhancement is attributed to the PVA pre-filling, which effectively suppressed the infiltration of AlOOH sol into the large pores of the support and generated open micro-pores upon calcination, thereby forming a more uniform and better-connected pore structure and consequently reducing mass-transfer resistance, which contributed to a synergistic “shielding-pore-forming” effect. Owing to the optimized pore architecture and stabilized interfacial charge, the γ-Al 2 O 3 membrane exhibited high rejection of MgCl 2 (91.62 %) and CaCl 2 (86.86 %), while maintaining relatively high permeace toward NaCl and Na 2 SO 4 . This separation behavior is governed by the combined effects of size sieving and the Donnan exclusion. Long-term operation and NaClO-cleaning tests further verified that the membrane retained its structural integrity and stable separation performance. This green and facile fabrication strategy offers a practical route for the low-cost production of high-performance ceramic NF membranes and shows considerable promise for engineering-scale applications.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xingye Chen,Meng Ge,Yanyong Li,Yatian Liu,Jiameng Wang,Lihong Zhang
A series of novel γ -Al 2 O 3 supported Pt In bimetallic catalysts were prepared by perovskite (PTO) lattice interstitial confined reduction and compared with industrial catalyst PtIn/ γ -Al 2 O 3 in the propane dehydrogenation to propene . The physics-chemistry properties of all catalysts and precursors were characterized by BET, NH 3 -TPD, TPR, XRD , TEM , STEM-EDS, XPS , TG and O 2 -TPO techniques. The results show that the metal ions of Pt 4+ and In 3+ confined in PTO lattice interstitial sites were more easily reduced than those confined in PTO lattice. The lattice interstitial confinement was beneficial for the formation of small and highly dispersed Pt In bimetallic species on the surface of γ -Al 2 O 3 supported PTO Nano islands. It is just the confinement of PTO lattice interstitial sites for appropriate In 3+ /In 0 ratio and weak Pt In interaction and the sharing Al O bond for anchoring PTO nanoparticles and weakening the surface acid sites result in the high activity and superior stability of PtIn/LaAlO 3 / γ -Al 2 O 3 in propane dehydrogenation. The initial propane conversion of PtIn/LaAlO 3 / γ -Al 2 O 3 was 47%, and can be maintained at 25% after 16 h, while its propene selectivity only decreased from 96% to 90%.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Jida Wang,Zhangshuai Ding,Feng Shi,Yifei Chen,Defa Hou,Fulin Yang,Can Liu,Yi Lu,Xu Lin,Zhifeng Zheng,Yunwu Zheng
An efficient and highly selective CaO-MgO-promoting γ-Al 2 O 3 decarboxylation catalyst was fabricated with different CaO to MgO ratios via a ball-milling method for regulating product distribution and production of gasoline-kerosene-diesel hydrocarbons via the catalytic copyrolysis of oleic acid (OA) and methanol under hydrogen-generating conditions. In addition, influencing factors, reaction mechanisms, possible reaction pathways and deactivation mechanisms were probed. The results showed that combining Ca, Mg and AlOx was vital for boosting oleic acid conversion, and synergy between metal and acid active sites via strong metal-support interactions enhanced deoxygenation-cracking activity. High-alkalinity CaO boosted C-C/C C bond cleavage, and MgO provided medium-strength Lewis acid sites; additionally, a large BET surface area and mesopore volume suppressed excessive hydrocracking reactions, improving biogasoline yield. Methanol addition provided active hydrogen atoms to enhance biogasoline selectivity at the expense of diesel and heavy oil production via olefinic cycles and aromatic cycle mechanisms and reduced coke deposition. The maximum hydrocarbon and biogasoline yields of 94.53% and 57.59% were achieved at OA/methanol= 5:1 and pyrolysis/catalytic temperature= 450/500 °C with1 g catalyst at a feedstock input rate of 0.1 ml/min.
研究领域:
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 39
·18450-18460
·
IF 3.3
Yao Shen,Fang Lin,Kang Wang,Xitao Wang
CaO-doped γ-Al2O3 beads were prepared by an alginate assisted sol–gel method, followed by grafting with alkyl groups and impregnation of NbCl5 to construct multi-functionalized γ-Al2O3 beads for efficient catalytic conversion of glucose to 5-hydroxymethylfurfural (5-HMF). Doping with CaO improved the binding capacity of the catalyst with glucose and increased the Lewis acid amount. However, a high CaO content would cover the Lewis acid sites of γ-Al2O3, resulting in a lower isomeric conversion of glucose to fructose. When the C8–Ca(10%)–γ-Al2O3 catalyst was loaded with Nb2O5, intermediate fructose was consumed rapidly resulting in complete conversion of glucose, which indicated that conversion of glucose to 5-HMF involved the isomeric conversion of glucose to fructose followed by dehydration of fructose to 5-HMF. This was necessary to balance hydrophilic isomerization reactions with restraining the rehydration of 5-HMF by hydrophobic modification. This is similar to the reaction in which a medium with a certain amount of water was beneficial for glucose isomerization. Under the synergistic effect of Lewis acid provided by γ-Al2O3 and Brønsted acid offered by Nb2O5, C8–Ca(10%)–γ-Al2O3–Nb(3%), a glucose conversation rate of 100% and the highest yield of 5-HMF (68.4%) were achieved in the reaction medium with a dimethylsulfoxide/H2O (V/V) ratio of 4 : 1, a catalyst amount of 33 mg, a reaction temperature of 140 °C and a reaction time of 4 h.
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
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Li,Tongtong Xia,Jiacheng Xu,Chunle Zhang,Li Xu,Zuliang Wu,Shuiliang Yao
CeO 2 /γ-Al 2 O 3 catalysts with distinct crystallite sizes were synthesized by changing the precursors of ceria. CeO 2 /γ-Al 2 O 3 prepared by cerium nitrate (CN) had smaller crystalline size than samples prepared by cerium chloride or cerium acetate. They were evaluated in the plasma catalytic oxidation reaction of n -undecane (C11), which is one of the representative long-chain alkane volatile organic compounds (VOCs). CeO 2 (CN)/γ-Al 2 O 3 displayed a higher C11 conversion of 100 % with 72 % of CO 2 selectivity under ambient conditions with an energy density of 205 J/L, while samples with larger crystalline sizes showed lower activities. X-ray photoelectron spectroscopy analysis confirmed that more concentration of adsorbed oxygen species and higher ratio of Ce 3+ /(Ce 3+ +Ce 4+ ) existed on the surface of CeO 2 /γ-Al 2 O 3 samples with smaller crystalline size. Chemisorption experiments further verified that surface oxygen vacancies resulted in the different catalytic activities. In situ diffuse reflectance infrared Fourier transform spectroscopy analyses showed that the oxidation capability of intermediates by-products enhanced with the decrease of crystalline size. Results revealed that the crystallite size of CeO 2 had a significant effect on the redox properties. This research provides an insight into the regulation of oxygen vacancy in transition metal oxides to facilitate the plasma catalytic performance of alkane VOCs under mild reaction conditions.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Juan Liu,Wen-Ying Li,Jie Feng,Xiang Gao
The improvement of the sulfur tolerance over Pt catalyst is critical for the hydrotreatment of crude oil. Fe was co‒impregnation with Pt on γ-Al 2 O 3 at different calcination temperature. Results revealed that adding Fe significantly facilitated the reduction of Pt oxides for the catalyst calcined at 400 °C. The morphological analysis and CO chemisorption showed Fe improved the dispersion of Pt nanoparticles. The surface chemical state analysis implied the co‒existence of the electron‒deficient Pt and metallic Fe. However, the increase of calcination temperature caused a decreased reducibility of Pt oxides due to strong metal support interaction. A higher dibenzothiophene hydrodesulfurization conversion of 97.7 % with a dominant biphenyl selectivity of 96.7 % were acquired for the catalysts incorporated with Fe. The density functional theory calculations confirmed the alloyed Fe led to the formation of electron‒deficient Pt atoms, and the higher affinity to sulfur made Fe be a favorable additive for noble metal catalyst in the hydrodesulfurization.
研究领域:
催化
·
化工
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yucong Song,Xiaoshu Ding,Fang Li,Dongsheng Zhang,Xinqiang Zhao,Yanji Wang
Methylcyclohexane diisocyanate (HTDI) is the core raw material for the synthesis of high-grade polyurethane . Aiming at the problems existing environmental pollution and safety risks in the phosgene process, a novel and green synthesis route of HTDI was proposed. We studied the catalytic hydrogenation of dimethyl toluene dicarbamate (TDC) benzene ring to methyl cyclohexyldicarbamate (HTDC) in this novel route. The effects of metal active components, supports and metal Rh loadings on the catalytic performance were investigated. It was found that the supported Rh/γ-Al 2 O 3 catalyst had excellent catalytic activity and selectivity. The yield of HTDC was close to 100 % at 100 °C under 3 MPa hydrogen pressure. However, the catalyst was deactivated seriously after the reaction. The organic matter adsorbed on the catalyst surface and covered the active metal was the main reason for the catalyst deactivation . Fortunately, the deactivated catalyst could be regenerated by solvent washing and high temperature calcination .
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Shuyun Bi,Yue Yuan,Fengming Zhang,Yuting Wang,Jia Liu,Bin Yang,Daqian Song
Two aminoglycoside antibiotics (AGs), gentamicin (GEN) and tobramycin (TOB), have good antibacterial activity against most pseudomonas aeruginosa and staphylococcus. The molecular structure of these drugs lack chromogenic groups, which brings challenges to their detection. In this project, the detecting methods for GEN and TOB utilizing surface-enhanced Raman spectroscopy (SERS) based on γ -Al 2 O 3 -modified silver nanoparticles (AgNPs) coated with bovine serum albumin (BSA) were established. The enhancement factors (EFs) of GEN and TOB were 2.44 × 10 5 and 2.67 × 10 6 , respectively. The transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and spectrophotometric techniques were used to characterize the substrate and the combination of the substance with drugs. The pH, the addition amounts for the substrate and coagulant, as well as the mixing time were optimized. On the basis of single factor experiments, a more scientific response surface model was established. The concentrations of GEN and TOB showed good linear relationships with their Raman signals in the ranges of 6.67 × 10 −8 – 2.00 × 10 −6 and 6.67 × 10 −9 – 3.00 × 10 −7 mol L −1 respectively. The limits of detection (LODs) were 11.88 and 1.26 nmol L −1 for GEN and TOB, respectively. The methods were used successfully for the samples determination of the two AGs in commercial drugs and meat products.
研究领域:
分析化学
·
药学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Canshuo Gu,Lungang Chen,Yong Liu,Xinghua Zhang,Jianguo Liu,Qi Zhang,Chenguang Wang,Longlong Ma
The production of furanic biofuel 2-methyltetrahydrofuran (2-MTHF) has been studied by hydrodeoxygenation of biomass-derived levulinic acid (LA) over bimetallic NiCo/γ-Al 2 O 3 catalyst. The contents of Ni and Co in NiCo/γ-Al 2 O 3 were investigated. The Ni 5 Co 25 /γ-Al 2 O 3 catalyst gave high activity in hydrodeoxygenation of LA with a 73.4% yield of 2-MTHF under optimal conditions. The crystal phase, valence states, acidity and basicity of catalysts were measured by multiple characterizations to understand the relationships among 2-MTHF yields and catalyst properties. XPS characterization revealed that the number of metal oxides increased on bimetallic catalysts while the reduced metals occupied on monometallic catalysts. The bimetallic catalysts also presented increased acidity than that of monometallic catalysts. These distinct properties were also observed among bimetallic catalysts with different contents of Ni and Co, which were responsible for different performances. Besides, the solvent effect on the structure of 1,4-pentanediol, which was further converted to 2-methyltetrahydrofuran, was disclosed by molecular dynamics simulations.
研究领域:
化学工程
·
催化
·
生物燃料
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Weiquan Cai,Junlin Zhuo,Jimin Fang,Zhichao Yang
A series of nanorod-like porous Pd/γ-Al 2 O 3 catalysts with controllable textural properties and enhanced catalytic performance in 2-ethyl-9,10-anthraquinone (eAQ) hydrogenation for H 2 O 2 preparation were successfully prepared via a facile sol–gel method using aluminum isopropoxide as aluminum precursor and eAQ as structure directing agent, sequential calcination and impregnation process with Na 2 PdCl 4 solution. The physicochemical properties of the catalysts obtained with different addition amounts of eAQ were comparatively characterized by XRD, TG–DSC, BET, TEM, CO-TPR, H 2 -TPR and H 2 –O 2 titration. The results show that addition of eAQ can not only effectively control the textural properties (surface area, pore volume and average pore size) of the catalysts, but also lower their reduction temperature of active metal. Importantly, the catalyst obtained with an addition amount of 4 wt% eAQ shows the highest hydrogenation efficiency of 10.28 g·L −1 , which is 37.3% higher than 7.49 g·L −1 of the catalyst obtained without eAQ.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Ding Liu,Zhenkun Su,Bo Han,Kaisheng Xia,Chenggang Zhou,Qiang Gao
Cobalt–aluminum oxide clusters-embedded γ-Al 2 O 3 nanosheets (CAO@AO) were facilely fabricated and developed for peroxymonosulfate (PMS) activation. Interestingly, the Al–OH-rich amphiphilic surface of CAO@AO endowed the catalyst with unique interfacial pH-buffering property, which stabilized the reaction media at nearly neural level and thus prevented the cobalt sites from leaching. Moreover, the presence of Al–OH groups around the Co−Al oxide clusters facilitated the activation of PMS and the redox cycle of Co 2+ /Co 3+ , which resulted in a boosted catalytic activity. Consequently, the CAO@AO exhibited zero leaching of cobalt and high efficacy for PMS activation, enabling complete and ultrafast removal of metronidazole with a significantly higher turnover frequency (TOF, 1.83 min −1 ) than that of Co 3 O 4 (0.004 min −1 ). It was also demonstrated that introducing suitable foreign metal into CAO@AO could further enhance the catalytic activity (e.g., TOF of Mn(40%)-CAO@AO: 5.80 min −1 ). Furthermore, Mn(40%)-CAO@AO-decorated granular support was synthesized that dominated a continuous-flow degradation in column reaction system.
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
Arabian Journal of Chemistry
·
2020
·
IF 4.762
Jiayao Li,Weifeng Song,Zefeng Yu,Qiuhua Li
The quality of dairy farming wastewater in different regions is particular and different. In Southern China, the Chemical Oxygen Demand (COD Cr ) and colourity of effluent from conventional dairy farming wastewater treatment processes are similar. Catalytic ozonation is a very promising technical method. In this paper, the Mn-Fe-Ce/γ-Al 2 O 3 catalyst was prepared via the optimized preparation method of impregnation roasting using γ-Al 2 O 3 as the carrier, and this catalyst was used in the ozonation of actual dairy farming wastewater from treatment facilities. The performance of the Mn-Fe-Ce/γ-Al 2 O 3 catalyst on dairy farming wastewater was investigated using a simulated dynamic test. The effects of the reaction time, pH and catalyst dosage on COD Cr and the colourity removal ratio were investigated. The results show that the optimum treatment conditions were a reaction time of 20 min, pH 9, and catalyst dosage of 15 g/L. The COD Cr removal ratio reached 48.9% and the colourity was 95% under the optimum conditions. BOD 5 /COD Cr increased from 0.21 to 0.54 after catalytic ozonation, indicating that the biodegradability of wastewater was significantly improved. This research provides a new method and theoretical guidance for dairy farming wastewater treatment.
研究领域:
环境工程
·
废水处理
·
催化
✓ 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）