RENEWABLE ENERGY
·
2025
·
IF 9.1
Shuaixia Hou,Wenlei Xie
Hierarchical porous materials have been considered as promising catalyst carriers due to their large specific surface area and multi-sized pore structure, which can efficiently reduce the mass-transfer resistance of macromolecular reactants as well as improve the exposure of the active sites. In this research, a series of hierarchical porous solid acid catalysts with dual metal oxide active centers, namely Mo/V@H-Al 2 O 3, was prepared by introducing Mo and V into hierarchical porous H-Al 2 O 3 carriers via a successive incipient wetness impregnation approach. The functional species, crystal structures, morphological features, and acidic properties of the synthesized Mo/V@H-Al 2 O 3 catalysts were explored using various characterization techniques. Results showed that this catalyst not only possessed the structural advantages of relatively large surface area and ordered hierarchical porous structure, but also contained dual Brønsted-Lewis acid sites. With the low-cost acidic oils as feedstocks, this catalyst can concurrently catalyze the oil transesterification and free fatty acid (FFA) esterification reaction with the oil conversion rate of 94.3 % and full conversion of FFA under the optimized conditions, achieving one-pot transformation of the acidic oil to biodiesel and thereby simplifying the laborious separation procedure. The synergistic effect between the hierarchical porous structure and the strong acidity was shown to boost the catalytic performance of this Mo/V@H-Al 2 O 3 catalyst for the efficient biodiesel production. The high moisture and FFA-tolerant capacity emerged for this catalyst, and it had good reusability during the biodiesel production process, still with above 80 % of oil conversion even after five cycles of reuse, endowing it to have the great potential for cost-effective and sustainable production of biodiesel in particular with low-cost acidic oils as feedstocks.
研究领域:
化学工程
·
催化材料
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Wuming Xie,Fengping Zhou,Xiaolin Bi,Dongdong Chen,Zijun Huang,Yuhui Li,Shuiyu Sun,Jingyong Liu
Nickel (Ⅱ)−ethylenediaminetetraacetic acid (Ni−EDTA) complexes are widely present in electroplating effluents. Owing to its chemical stability, Ni−EDTA is hardly removed in traditional Fenton/Fenton-like processes with conventional iron (Fe)−based catalyst. In this study, oxygen vacancies were introduced into our highly efficient and novel Fe 3 O 4 @γ−Al 2 O 3 catalysts using Cu doping for Ni−EDTA decomposition in Fenton−like system. Without noble−metal cocatalyst, the introduction of oxygen vacancies in Cu−doped Fe 3 O 4 @γ−Al 2 O 3 catalysts exhibit excellent Fenton−like activity even in neutral or alkaline conditions. Experimental results revealed that, without the aid of extra energy, Ni−EDTA complexes could be effectively decomposed over oxygen vacancies−based catalyst. Electron paramagnetic resonance (EPR), X−ray photoelectron spectroscopy (XPS), oxygen temperature−programmed desorption (O 2 −TPD), and hydrogen temperature−programmed reduction (H 2 −TPR) were used to get a deep insight into the decomposition mechanism. Additionally, by employing the Al−containing support, stable layered double−hydroxide phases of Ni Al could be formed, indicating that a synergy of oxidation and adsorption could simultaneously take place, which led to the recovery of released Ni 2+ ions and also reduction in secondary pollution. To investigate the decomposition process of Ni−EDTA over oxygen vacancies−based catalyst, liquid chromatography−quadrupole/electrostatic field orbitrap high resolution mass spectrometry (LC−MS/MS) was employed to identify the generated intermediates, and thus, a plausible decomposition pathway was successfully conceived.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 5
·期 6
·3333-3339
·
IF 5.426
Dong-Mei Lv,Zhong-Ning Xu,Si-Yan Peng,Zhi-Qiao Wang,Qing-Song Chen,Yumin Chen,Guo-Cong Guo
(Pd–CuCl2)/γ-Al2O3 catalyst with excellent activity and selectivity has been successfully developed for vapor-phase carbonylation of methyl nitrite to dimethyl carbonate (DMC). It has been demonstrated that Cl− is necessary for the superior selectivity (99.8%) to DMC, and that Cl− and Cu2+ have a synergetic effect. The Lewis acid sites of the γ-Al2O3 support may be suitable for vapor-phase carbonylation of methyl nitrite to DMC. Moreover, the catalytic mechanism of DMC formation on the (Pd–CuCl2)/γ-Al2O3 catalyst has been reasonably proposed based on the results of XPS and in situ diffuse reflectance infrared spectroscopy. The intermediate Cl–Pd(II)–COOCH3 is the key factor for the synthesis of DMC.
研究领域:
催化
·
化学工程
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Qiangqiang Xue,Binhang Yan,Meng Chen,Yujun Wang,Guangsheng Luo
Hydrogen-rich syngas production via diesel steam reforming (DSR) is of great interest because of the high H2/CO ratio and available external heat sources. In this study, catalysts (particle size (dp) = 3–5 mm) containing 10 wt % Ni were prepared through wet impregnation, and their performance was evaluated in a semipilot fixed-bed reactor (Φ = 42 mm). The catalyst was doped with La, which resulted in excellent catalytic performance under different operating conditions. The apparent activation energies of the catalysts for the model diesel (n-dodecane) steam reforming increased in the order Ni/Ce0.75La0.25O2−δ-γ-Al2O3 (17 kJ/mol) < Ni/CeO2-γ-Al2O3 (18 kJ/mol) < Ni/γ-Al2O3 (27 kJ/mol). The model DSR over Ni/Ce0.75La0.25O2−δ-γ-Al2O3 showed product stability and produced a high H2 content (32 vol %). Fresh and spent catalysts were characterized by X-ray diffraction, N2 adsorption–desorption isotherms, H2-temperature programmed reduction, inductively coupled plasma–mass spectrometry, X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, and thermogravimetric analysis. The origin of the oxygen vacancies in the La-doped catalyst was elucidated using density functional theory calculations. The improvements in the activity and stability of the Ni/Ce0.75La0.25O2−δ-γ-Al2O3 catalyst are attributed to (1) the enhancement in the oxygen release/storage capacity, (2) the stabilizing interaction between Ni and the surface La2O3 phase, and (3) the small size (11 nm) and uniform distribution of Ni particles. Out of the tested catalysts, the spent Ni/Ce0.75La0.25O2−δ-γ-Al2O3 catalyst showed the lowest coke deposition (5.8 mg/g-cat.) and the least severe Ni agglomeration after 10 h of testing because of its superior ionic mobility and oxygen storage capacity.
研究领域:
化学工程
·
催化
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Wenbin Huang,Qiang Wei,Haoran Liu,Han Yang,Zhen Xu,Zhengyu Chen,Dongdong Chen,Yasong Zhou
The reason for high-difficulty nitrogen removal of aromatic N-heterocyclic compounds in petroleum fractions was investigated from the main thought of “NiWS property - Reaction behavior - DFT calculation”. The properties of the used catalyst were characterized by a series of techniques with the aim of providing the basis for model construction in the DFT calculations. The kinetic experiments in fixed-bed reactor revealed that although 1,2,3,4-tetrahydroquinoline (THQ1) and decahydroquinoline (DHQ), o-ethylaniline (OEA) exhibited relatively high yields in the HDN reaction of quinoline and indole respectively, they were all able to show high conversions and HDN rates when reacted as feedstocks alone. The study of product normalizations in the reaction system of the mixed feedstocks demonstrated that the difficulty of conversion of THQ1 and DHQ in quinoline HDN was mainly due to the inhibition effect of quinoline feedstock. While in the HDN of indole, the presence of the intermediate product OEA was the main factor for the low conversion of indole. This phenomenon of inhibition originating from within the molecular reaction network was proposed as N-N self-inhibition effect for the first time. The DFT calculations suggested that the inhibition of quinoline on THQ1 could be attributed to the adsorption advantage of quinoline, while the inhibition on DHQ was mainly due to the steric hindrance effect of DHQ itself. And the inhibition effect of OEA on indole can be mainly attributed to its greater nucleophilicity and stronger adsorption ability on the active sites compared with IND.
研究领域:
化学工程
·
催化
·
石油炼制
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 21
·6185-6197
·
IF 5
Hui Guo,Tingting Ge,Yuchao Li,Yuxia Li,Yanxia Zheng,Xinpeng Guo,Haofei Huang,Ming Wang,Cuncun Zuo
Organic solvent method was used to prepare the active component VPO, which was loaded on ball-milled γ-Al2O3 support. VPO/γ-Al2O3 catalysts were synthesized by in situ generation for the synthesis of acrylic acid (AA) by the aldol condensation of acetic acid (HAc) and formaldehyde (HCHO). The effects of the calcination temperature and the loading of the active component VPO on catalytic activity were systematically investigated. XRD, BET, SEM, CO2/NH3-TPD, FT-IR spectroscopy, and TG techniques were used to characterize the VPO/γ-Al2O3 catalysts. The results showed that the catalyst had the best crystal structure and acid–base activity center at a calcination temperature of 350 °C. The catalytic performance was evaluated using a fixed bed reactor. 60% VPO/γ-Al2O3 exhibited the highest reactivity, and the yield of AA was up to 51.5%. Response surface methodology (RAM) was used to optimize the reaction conditions for aldol condensation. The kinetic equation and reaction order of the aldol condensation reaction were determined using the VPO/γ-Al2O3 catalyst. It provides guidance for the in-depth study of aldol condensation reactions in the future.
研究领域:
催化
·
化学工程
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Lina Zhou,Xingwang Zhang,Lecheng Lei
The δ-FeOOH/γ-Al 2 O 3 composite were prepared under mild conditions by the activated alumina absorption of Fe 2+ followed by rapid oxidation by H 2 O 2 . The δ-FeOOH growing on γ-Al 2 O 3 was composed of nanoneedles , forming a 3D flower-like morphology with a diameter of ~10 nm to provide a large number of active sites. The effects of Fenton reaction conditions, such as catalyst dosage, H 2 O 2 concentration, phenol concentration, initial pH value and temperature, on the catalytic activity of δ-FeOOH/γ-Al 2 O 3 were investigated. Under the optimal conditions, about 97.4% of phenol and 81.6% of total organic carbon (TOC) were removed in 5 min and 2 h, respectively. In addition, with γ-Al 2 O 3 as macroscopic size carrier (the diameter of 1–2 mm), the catalyst could be easily reused 10 runs with no significant reduction in catalytic activity. The possible mechanism was discussed, and it revealed that OH· was the main active species for degradation of phenol into intermediates and further into CO 2 and H 2 O. The δ-FeOOH/γ-Al 2 O 3 also showed high catalytic activity and reusability in the treatment of real industrial wastewater , making it a promising catalyst for industrial application.
研究领域:
环境科学
·
化学工程
·
催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Zhuangpeng Huang,Zhiping Chen,Yuancai Chen,Yongyou Hu
Iron-copper bimetal supported on mesoporous γ-Al 2 O 3 with different Fe/Cu ratios was prepared via a modified evaporation-induced self-assembly method and employed to degrade 4-chlorophenol (4-CP) in a Fenton-like process. The X-ray photoelectron spectroscopy, X-ray diffraction spectrum and UV–vis diffuse reflectance spectroscopy results confirmed the co-doping of Fe 2+ /Fe 3+ and Cu + /Cu 2+ into the lattice of γ-Al 2 O 3 through the bonds of Al O Fe and Al O Cu. With the iron and copper co-doped in γ-Al 2 O 3 , three-fold oxygen vacancies (V 0 ) could be achieved compared with that of non-metal catalysts, which was favorable for the reduction of iron and copper species. The 1Fe3Cu-γ-Al 2 O 3 with a Fe/Cu mass ratio of 1:3 exhibited the highest activity on Fenton-like degradation of 4-CP due to the synergistic effects of Fe and Cu by facilitating the electron transfer in the recycles of Cu + /Cu 2+ and Fe 2+ /Fe 3+ based on the results of X-ray photoelectron spectroscopy, cyclic voltammetry and electro paramagnetic resonance analysis. The utilization efficiency of H 2 O 2 was as high as 86.0% when 4-CP almost disappeared (i.e., 99.7 percent of 0.78 mM 4-CP) at 240 min and pH 7.0, additionally, their dechlorination and TOC removal efficiencies were 92.0% and 81.6%, respectively. The catalyst also displayed a good performance after 5th cycles. Furthermore, a possible mechanism for activation of OH on the catalyst surface was also proposed.
研究领域:
环境化学
·
催化
·
水处理
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2013
·Vol. 27
·期 3
·148-154
·
IF 2.011
Li Qiang Wu
Nano n -propylsulfonated γ-Al 2 O 3 is easily prepared by the reaction of nano γ-Al 2 O 3 with 1,3-propanesultone. This reagent can be used as an efficient catalyst for the synthesis of spiro [indoline-3,4-pyrazolo[3,4- e ][1,4]thiazepine]diones in aqueous media. This new method consistently has the advantages of excellent yields and short reaction times. Further, the catalyst can be reused and recovered several times. Copyright © 2013 John Wiley & Sons, Ltd.
研究领域:
催化化学
·
有机合成
·
绿色化学
·
纳米材料
·
药物化学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2020
·Vol. 130
·期 1
·241-256
·
IF 1.52
Ge Meng,Chen Xingye,Li Yanyong,Wang Jiameng,Xu Yanhong,Zhang Lihong
This paper describes the synthesis and application of γ -Al 2 O 3 supported SmCoO 3 perovskite-type oxide in the catalytic propane dehydrogenation to propene. Various techniques including X-ray diffraction (XRD), H 2 temperature-programmed reduction (H 2 -TPR), transmission electron microscopy (TEM), thermogravimetric analysis (TG) and X-ray photoelectron spectra (XPS) were used to characterize the physico-chemical properties of SmCoO 3 /Al 2 O 3 and derived Co-based catalyst. The characterization results reveal that the perovskite lattice confinement can lead to better dispersed cobalt oxide and restrain the reduction to metallic Co species. Under the high weight hourly space velocity (3 h −1 ), the propane conversion and propene selectivity of the reduced SmCoO 3 /Al 2 O 3 catalyst were 25% and 94%, respectively, and obviously higher than those of the reduced SmCoO/Al 2 O 3 catalyst used as a referential sample prepared by an incipient wetness impregnation method. A large amount of coke was formed over the used SmCoO/Al 2 O 3 catalyst. Instead, the SmCoO 3 /Al 2 O 3 -derived Co-based catalyst can greatly reduce the amount of coke deposition. The superior catalytic performance and anti-coking ability of SmCoO 3 /Al 2 O 3 catalyst are attributed to the formation of a large amount of well-dispersed surface Co 2+ species, especially small CoO nanoparticles, and the absence of metallic Co species.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Jia Shen,Chen Chen,Lichuan Song,Liding Zhong,Kai Shan,Yanglong Guo,Wangcheng Zhan,Yun Guo,Haifeng Wang,Li Wang
The anchoring effect between surface hydroxyls (–OH) and metal species has been extensively utilized to enhance catalyst stability. Nevertheless, few studies have investigated the impact of alloying process involving different types of –OH species. In this research, we discovered that the formation of the alloy particles Pt 3 Co was significantly influenced by the presence of distinct –OH species on Al 2 O 3 . Intriguingly, those Pt 3 Co alloy particles exclusively formed on α-Al 2 O 3 owing to the weak interaction between both Pt and Co species and the triply bridging hydroxyls (µ 3 -OH). In contrast, Pt and Co species were found to be separately dispersed on γ-Al 2 O 3 because of the strong anchoring effect of terminal hydroxyls (µ 1 -OH), especially for Co atoms. Density functional theory (DFT) calculations highlighted the difference in adsorption energies of the two metals on different hydroxyl groups, providing a theoretical rationale for the influence of hydroxyl groups on alloy formation. The presence of Pt 3 Co alloy resulted in a fourfold increase in the specific catalytic rate of Pt 3 Co/α-Al 2 O 3 in CO-PROX compared to Pt 3 Co/γ-Al 2 O 3 . Arguably for the first time, this study demonstrates the association between alloy formation and –OH groups, providing a unique perspective on the design of alloy catalysts.
研究领域:
催化化学
·
材料科学
·
理论计算化学
✓ 已验证
产品关联
DOI
高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2023
·Vol. 43
·期 6
·1651-1672
·
IF 3.6
Zhang Lei,Zou Zhuorui,Lei Zhang,Jia Yang
In this research, xylene was utilized as a simulated gas, γ-Al 2 O 3 pellets were selected as catalyst carriers, and FeO x , MnO x , CeO x , and CuO x were used as active components to analyze the synergistic treatment of VOCs–O 3 by low-temperature plasma combined with supported catalysts. Different metal oxides and other factors influence the synergistic treatment of VOCs–O 3 . The results showed that the catalytic effect of Fe–Mn/γ-Al 2 O 3 prepared by the equivalent volumes of consecutive impregnation method was better than that of Fe–Mn/γ-Al 2 O 3 prepared by co-impregnation method. When combined with low temperature plasma technology, high-energy electron collision reaction and oxidation reaction between free radicals occurs, which played a synergistic role in the degradation of VOCs–O 3 . The total removal rate of xylene was 94.88%, and the depletion rate of ozone was 84.1%.
研究领域:
環境科學
·
化學工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）