FUEL
·
2023
·
IF 7.4
Shanshan Shao,Weicheng Wang,Xinyu Yang,Zian Ye,Jiayuan Sun,Xiaohua Li
A novel method was proposed for biomass fast pyrolysis oil upgrading using catalytic transfer hydrogenation (CTH) based on various CuO catalysts with methanol as the hydrogen donor. The carbonyl compounds in the bio-oil were hydrogenated to synthesize alcohols using a hydrotalcite-like Cu 2 Al catalyst at 200℃ for 4 h. The maximum yield of alcohols reached 73.81%. Cu 2 Al is well applicable to large-scale application in bio-oil CTH for its excellent CTH performance, treating capacity up to 10 vol%, and stable alcohol production during the 5th reuse process. Given the huge range of molecular size of the complex chemical composition of bio-oil, the CTH of raw bio-oil using three catalysts (i.e., CuO/BC, CuO/Al 2 O 3 , and Cu 2 Al) was compared. The CTH performance (71.56%) of CuO/Al 2 O 3 was significantly comparable to that of Cu 2 Al, and it is also a good choice. The main reason for this outcome was that the average pore size of the two catalysts was high (>5nm), which reduced the possibility of pore blockage during the reaction and improved stability. The reusability of CuO/BC was markedly lower for its small average pore size (∼2nm). Furthermore, the CTH of raw bio-oil over CuO catalyst was discussed in depth, such that a basis is laid for the upgrading and utilization of bio-oil.
研究领域:
化学工程
·
可再生能源
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2023
·
IF 8.7
Xinyu Yang,Shanshan Shao,Xiaohua Li,Dong Tang
The catalytic transfer hydrogenation (CTH) of bio-oil over CuO/PC (porous carbon) with the solid residue produced during biomass pyrolysis as the carrier was investigated with methanol as the hydrogen donor. The effect of carbonization temperature, activation temperature, KOH solution and metal loading on the physicochemical characteristics of CuO/PC catalystand catalytic transfer hydrogenation of bio-oil were investigated. The main alcohols formed in the CTH of bio-oil were 1, 4-butanediol, 1, 3-cyclopentadiol, 1, 3-cyclohexanediol, 2-cyclohexenol and alcohols. It was revealed that more alcohols were produced over CuO/PC using less Cu(NO 3 ) 2 than Cu 2 Al considering their favorable porous system. The well-developed pore structure is formed in PC at a higher calcination temperature and the concentration of activator, which was favorable for the CTH of bio-oil. Under the optimized preparation conditions, the mesopores accounting for 50% in the total pores, achieving the maximized yield of alcohols of 81%, and the well recycling performance was observed with the overall yield of alcohols decreases within 3% after five cycles because of the greater mesopores ratio. The biochar-based PC catalyst in this work enhances the effective usage of biomass to produce alcohols, fully conforming to the theme of energy conservation and low-carbon times.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2015
·
IF 2.516
Jiefeng Xiao,Zhibao Huo,Dezhang Ren,Song Zhang,Jiang Luo,Guodong Yao,Fangming Jin
A novel and efficient process for the production of 1,2-propylene glycol with high productivity and high selectivity from biomass-derived lactic acid over CuO was investigated. As a result, CuO exhibited a high catalytic activity while Zn acted as a reductant for the conversion of lactic acid to 1,2-propylene glycol. Among the various reaction parameters, such as catalysts, reductants, temperature, water filling and reaction time we investigated, a 93% yield of 1,2-propylene glycol in the presence of 0.83 mmol lactic acid, 5 mmol CuO and 30 mmol Zn with 35% water filling at 250 °C for 2 h was achieved. In addition, a carbon balance at optimum reaction conditions by TOC indicated that approximately 99% lactic acid was converted into liquid products in the transformation. In situ formed hydrogen by the oxidation of Zn in water is effective for the transformation compared to added gases hydrogen. The proposed mechanism for the conversion of lactic acid to 1,2-propylene glycol over CuO is also discussed.
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Xiaojing Song,Libin Yang,Xinyu Chang,Songsong Miao,Hao Zhang
The Na LTA zeolite confined CuO catalyst CuO@Na LTA was prepared via the method of ligand protected in situ with Cu 2+ -glycine complex as Cu source, and characterized by multiple characteristic techniques. The results revealed that CuO nanoparticles were highly dispersed on Na LTA zeolite, and the catalytic properties of CuO@Na LTA were investigated in the alkene epoxidation with H 2 O 2 as oxidant in dioxane. For styrene oxidation, catalyst CuO@Na LTA exhibited excellent catalytic activities with 83 % conversion and 63 % selectivity to styrene epoxide, and could be easily recycled several times without obvious activity loss. The excellent catalytic activities could be attributed to the highly dispersed active CuO species. Besides, multiple electronic effects and coordinative interactions exited in Cu ion and the Si-Al zeolite skeleton framework played a key role in the catalytic recyclability.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jiating Shen,Cheng Rao,Ziyang Fu,Xiaohui Feng,Jianjun Liu,Xueliang Fan,Honggen Peng,Xianglan Xu,Chao Tan,Xiang Wang
To gain fundamental understanding on the catalytic property of individual CuO for soot combustion, a series of CuO samples have been prepared with a simple precipitation method by using different Cu precursors and precipitants. Pure monoclinic CuO crystalline phase has been detected by XRD and Raman for all the samples. However, by changing the precursors and precipitants, the morphology and texture property of the CuO samples can be influenced. Furthermore, the redox property of the CuO catalysts can also be altered. Soot-TPR results have testified that four types of active sites with varied activity are present on the surface of all the samples, but only the two types of active sites that can be reduced by soot particles below 500 °C are believed to contribute effectively to soot combustion. It has been discovered that the surface oxygen mobility and abundance are the crucial factors to determine the soot combustion activity of CuO catalysts. Because of the optimal balance of these two factors, CuO-Cu(NO 3 ) 2 -Na 2 CO 3 , a CuO catalyst prepared by the combination of Cu(NO 3 ) 2 precursor and aqueous Na 2 CO 3 precipitant, displays the highest soot combustion activity among all the catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Carbon Energy
·
2024
·
IF 19.5
Fangfang Chang,Zhenmao Zhang,Yan Zhang,Yongpeng Liu,Lin Yang,Xiaolei Wang,Zhengyu Bai,Qing Zhang
Electrochemical CO 2 reduction reaction (CO 2 RR) offers a promising strategy for CO 2 conversion into value-added C 2+ products and facilitates the storage of renewable resources under comparatively mild conditions, but still remains a challenge. Herein, we propose the strategy of surface reconstruction and interface integration engineering to construct tuneable Cu 0 –Cu + –Cu 2+ sites and oxygen vacancy oxide derived from CeO 2 /CuO nanosheets (OD-CeO 2 /CuO NSs) heterojunction catalysts and promote the activity and selectivity of CO 2 RR. The optimized OD-CeO 2 /CuO electrocatalyst shows the maximum Faradic efficiencies for C 2+ products in the H-type cell, which reaches 69.8% at −1.25 V versus a reversible hydrogen electrode (RHE). Advanced characterization analysis and density functional theory (DFT) calculations further confirm the fact that the existence of oxygen vacancies and Cu 0 –Cu + –Cu 2+ sites modified with CeO 2 is conducive to CO 2 adsorption and activation, enhances the hydrogenation of *CO to *CHO, and further promotes the dimerization of *CHO, thus promoting the selectivity of C 2+ generation. This facile interface integration and surface reconstruction strategy provides an ideal strategy to guide the design of CO 2 RR electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Songxue Wang,Jiayu Tian,Linran Jia,Jialin Jia,Sujie Shan,Qiao Wang,Fuyi Cui
CuO catalyst dispersed in the feed water (CDF) and CuO catalyst immobilized on the ceramic hollow fiber membrane (CIM) for peroxymonosulfate (PMS) activation were developed and employed in the submerged membrane filtration systems for drinking water treatment , respectively. The performance of the CDF and CIM systems was systematically investigated and compared. The result indicated that BPA concentration, PMS dosage and CuO content exerted much less influence on BPA degradation in the CIM system as compared with that in the CDF system. The CIM system exhibited a greater advantage in the performance of BPA degradation and TOC removal when treating a large volume of feed (>300 mL). In addition, the effect of actual water matrix on the two systems was evaluated. The CIM system showed higher resistance to the adverse influence and better anti-fouling performance than the CDF system. The comparative study on the performance of CDF and CIM systems provides meaningful information for developing the process of membrane filtration coupled with PMS oxidation .
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhiyuan Ni,Tao Yu,Xiang Li,Chunming Liu,Junhua You,Xuanwen Liu,Rui Guo,Hangzhou Zhang,Hongyu Li
Electrochemical carbon dioxide reduction (ECR), which converts carbon dioxide into valuable chemical substances, effectively achieves sustainable carbon neutrality. In this study, we report that CuO catalysts with varying vacancy (CuO-O V ) concentrations and morphological structures. CuO-O V can significantly enhance the selectivity for ethylene (C 2 H 4 ) and multicarbon products (C 2+ ) by reducing the free energy required for the formation of ∗CHO intermediates from ∗CO hydrogenation and lowering the energy barrier for C-C coupling reactions. The CuO(NaOH) catalyst exhibited a maximum Faradaic efficiency of 55.7% for the C 2+ product at -1.36 V vs. RHE. And C 2 H 4 displays a maximum Faradaic efficiency of ∼32.7% at -1.56 V vs. RHE.
研究领域:
材料科学
·
催化化学
·
能源转化
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 45
·19206-19219
·
IF 2.7
Li Cui,Fei Wang,Xiaoli Zhang,Yuewen Chen,Hai Liu,Yihu Ke,Yimin Wang,Xiya Zhang
The oxidation of glycerol to dihydroxyacetone (DHA) represents an efficient and economical process route. Although preparing Au/CuO catalysts from plant constituents has emerged as a novel approach for synthesizing biocompatible products, the complexity of plant constituents means that the active components still need to be clarified, making it challenging to control catalytic activity. In this study, we effectively separated and identified the active components of Syringa oblata Lindl. (SoL) leaf using column chromatography, and synthesized a series of Au/CuO catalysts from the different separated samples. Glycerol catalytic evaluation experiments showed that the S3 fraction, mainly consisting of phenolic substances, exhibited the highest catalytic activity, with a glycerol conversion rate of 86.6% and DHA selectivity of 82.0%, exceeding the activity of most current catalysts. A series of experiments and characterizations demonstrated the differences in reducibility and protective ability among the separated samples, and the preparation and glycerol reaction conditions for optimal performance are systematically optimized. This work provides in-depth insights into the preparation of catalysts using plant-based methods.
研究领域:
化学工程
·
材料科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Xinze Du,Yumei Liu,Huixiang Li,Shenglin Liu,Xiaojun Shen
Phenols are important building blocks widely applied in many fields. The pronounced orientational effect of the phenolic hydroxyl group makes achieving selective synthesis of meta -phenols challenging. Accessing meta -phenols needs lengthy synthetic sequences. Herein, we first developed a heterogeneous CO 2 -mediated CeO 2 -5CuO catalyst for decarboxylative oxidation of benzoic acids with a more than 80% selectivity to meta -phenols. This technology is based on a traceless directing group relay method. The CeO 2 -CuO catalysts with different Ce/Cu ratios exhibited controllable reaction selectivity between decarboxylation and decarboxylative oxidation. Spectroscopy experiments and computational studies showed the adsorption state of benzoic acid was found to be crucial for subsequent reaction pathways. The moderate adsorption on CO 2 -mediated CeO 2 -5CuO catalyst contributes to the distinct selectivity of phenol. Furthermore, the paddlewheel intermediate facilitates the synthesis of meta -phenols from benzoic acids. This traceless directing group method would promote the development of useful one-pot meta -substituted phenols from bio-based benzoic acids.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2015
·
IF 1.098
Song Zhang,Zhibao Huo,Dezhang Ren,Jiang Luo,Jun Fu,Lu Li,Fangming Jin
An efficient conversion of biomass-derived ethyl lactate to 1,2-propanediol (1,2-PDO) over CuO was investigated. Among the catalysts we tested, CuO, Cu 2 O and Co showed excellent catalytic activity for the conversion of ethyl lactate to 1,2-PDO in water, and CuO was more active and gave the best result. The 1,2-PDO yield of 93.6% was achieved when Zn acted as a reductant. The results indicated that in situ formed hydrogen by the oxidation of Zn in water is more effective than gaseous hydrogen, which failed to produce the 1,2-PDO from ethyl lactate. From a practical point of view, the present method may provide a useful route for the production of 1,2-PDO from ethyl lactate.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Chen Wang,Congbi Li,Xiaohui Wu,Xiangling Zhang,Mingjie Huang,Tao Zhou
Efficient and sustainable generation of high-valent metal-oxo species (HVMs) is critical for selective decontamination via Fenton-like catalysis, however, maintaining electron density balance at the active sites remains challenging. In this study, a zeolite-supported CuO catalyst was found to induce complete and selective Cu(III) oxidation of organics through persulfate (PDS) activation. PDS activation and pollutant oxidation occurred simultaneously at the electron-rich ≡Cu sites and electron-deficient ≡Al centers, respectively. Notably, zeolite could successfully serve as an electron buffer by creating dual active centers with distinct electron densities, stabilizing the generation and retention of ≡Cu(III) for exceptional anti-interference capacity. Strong metal-support interactions tuned the ≡Cu d-band center closer to the Fermi level, efficiently promoting electron transfer to ≡Cu sites through the Al/Si-O-Cu bond for the formation of ≡Cu(III). This study unveils a zeolite-based electron buffering strategy and presents an advanced approach for developing highly efficient catalysts in PDS activation and HVMs-mediated water purification.
研究领域:
环境科学
·
催化化学
✓ 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）