Catalysts
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2016
·Vol. 6
·期 9
·143
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IF 2.964
Lincai Peng,Ruili Tao,Yu Wu
Levulinate ester has been identified as a promising renewable fuel additive and platform chemical. Here, the use of a wide range of common metal salts as acid catalysts for catalytic upgrading of biomass-derived furfuryl alcohol to butyl levulinate was explored by conventional heating. Both alkali and alkaline earth metal chlorides did not lead effectively to the conversion of furfuryl alcohol, while several transition metal chlorides (CrCl3, FeCl3, and CuCl2) and AlCl3exhibited catalytic activity for the synthesis of butyl levulinate. For their sulfates (Cr(III), Fe(III), Cu(II), and Al(III)), the catalytic activity was low. The reaction performance was correlated with the Brønsted acidity of the reaction system derived from the hydrolysis/alcoholysis of cations, but was more dependent on the Lewis acidity from the metal salts. Among these investigated metal salts, CuCl2was found to be uniquely effective, leading to the conversion of furfuryl alcohol to butyl levulinate with an optimized yield of 95%. Moreover, CuCl2could be recovered efficiently from the resulting reaction mixture and remained with almost unchanged catalytic activity in multiple recycling runs.Keywords:biofuel;furfuryl alcohol;catalytic upgrading;metal salt;levulinate ester
研究领域:
化学工程
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2021
·
IF 3.712
Xianghua He,Ben Dai,Yafang Zhang,Dan Zhao,Dihui Zhang,Ruping Liang,Chao Chen
Efficient and applicable catalysts are highly desirable for advanced biomass transformation industry, here, we fabricated a series of Nd-Co-P catalysts for hydrogenation of furfural (FAL) to furfuryl alcohol (FOH). By comprehensive characterizations, it is demonstrated that the prepared Nd-Co-P samples are structured as (NdPO 4 ) m /Co 2 P nanocomposites with molar ratio ( m ) in range of 0.24–1.1; by manipulating m , the outstanding catalytic efficiency comparable with the performance of precious metal catalysts , such as turnover frequency (TOF) up to 0.50 s −1 (being ten-fold higher than Co 2 P) and FOH yield up to 97%, is achieved on the reusable (NdPO 4 ) m /Co 2 P composites. Temperature programmed desorption (TPD), in-situ infrared spectroscopy (IR) and kinetic-mechanism studies further disclose that Co 2 P is decisive for activating FAL, instead, NdPO 4 possesses unique capability of activating hydrogen which readily facilitate the selective hydrogenation of FAL to FOH through a rapid Langmuir–Hinshelwood process over (NdPO 4 ) m /Co 2 P catalyst. These results indicate that rare-earth phosphates like NdPO 4 can act as the promising and reliable catalytic component to activate hydrogen, which can be of interest not only for innovating novel and applicable non-metallic catalysts for sustainable biomass transformation analogous to hydrogenation of FAL, but also for expanding material base for other green mass transformation techniques involving hydrogen.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 10
·1811-1818
·
IF 4.239
Hongxing Wang,Guoqiang Ding,Yubo Liu,Junbo Zhang,Yongwang Li,Yulei Zhu
A sustainable and cost-competitive catalytic process for high yield production of levulinic acid (LA) and γ-valerolactone (GVL) from biomass-derived furfuryl alcohol (FOL) fluid was proposed with GVL as a self-circulation solvent. The innovative process eliminated the separation of the final product GVL and intermediate product LA from the solvent, and the actual concentration of FOL was improved enormously. A higher yield (90.5%) of LA was realized in the fixed-bed reactors than that in the conventional autoclave since the short residence time of the FOL solution could alleviate the polymerization of FOL in the continuous process. UV-Raman spectroscopy demonstrated that fewer polymers deposited on the catalysts, so superior stability of the zeolite was observed in the fixed-bed reactors. Moreover, an 89.4% high yield of GVL can be achieved since the integration of the tandem reaction of hydration and hydrogenation could substantially avoid side reactions in the fixed-bed reactors.
研究领域:
化学工程
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
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2021
·Vol. 16
·期 20
·3194-3201
·
IF 4.568
Jun Wu,Xinyue Yan,Wenrui Wang,Ming Jin,Yuhang Xie,Chengbing Wang
Graphical Efficient, stable, and low-cost N-doped graphitic carbon embedded CoNi bimetallic alloy nanocatalysts were developed for the catalytic transfer hydrogenation of biomass-derived furfural to value-added furfuryl alcohol with isopropanol as hydrogen donor. The synergy enabled by bimetallic alloys and abundant N-based Lewis-base sites and surface Co−N active species were responsible for the excellent catalytic performance. The development of efficient, stable, and cost-effective heterogeneous catalysts for catalytic transfer hydrogenation (CTH) of biomass-derived furfural (FAL) is highly desired. Herein, series of N-doped graphitic carbon embedded CoNi bimetallic alloy nanoparticles were fabricated and used for the CTH of FAL to value-added furfuryl alcohol (FOL) with renewable isopropanol as hydrogen donor. Intrinsic catalytic activity examination indicated the catalytic performance of Ni x Co y @NGC (x:y=1 : 3, 1 : 1, 3 : 1) nanocatalysts were sensitive to their chemical compositions. The optimal Ni 1 Co 1 @NGC nanocatalyst with Ni/Co mole ratio of 1 : 1 afforded a largest FOL yield of 89.3% with nearly full conversion of FAL. The synergistic effect enabled by bimetallic alloys and the abundant N-based Lewis base sites and surface Co−N active species were revealed based on systematic structural characterization, responsible for the excellent catalytic efficiency of bimetallic Ni 1 Co 1 @NGC nanocatalyst for CTH of FAL.
研究领域:
化学工程
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2020
·
IF 6.146
Qianqian Guo,Fan Yang,Xiaohui Liu,Mengqing Sun,Yong Guo,Yanqin Wang
Silicoaluminophosphate-34 (SAPO-34) molecular sieves have important applications in the petrochemical industry as a result of their shape selectivity and suitable acidity. In this work, nanoaggregate SAPO-34 with a large external surface area was obtained by dissolving pseudoboehmite and tetraethylorthosilicate in an aqueous solution of tetraethylammonium hydroxide and subsequently adding phosphoric acid . After hydrolysis in an alkaline solution, the aluminum and silicon precursors exist as Al(OH) 4 − and SiO 2 (OH) − , respectively; this is beneficial for rapid nucleation and the formation of nanoaggregates in the following crystallization process. Additionally, to study the effect of the external surface area and pore size on the catalytic performance of different SAPO-34 structures, the alcoholysis of furfuryl alcohol to ethyl levulinate (EL) was chosen as a model reaction. In a comparison with the traditional cube-like SAPO-34, nanoaggregate SAPO-34 generated a higher yield of 74.1% of EL, whereas that with cube-like SAPO-34 was only 19.9%. Moreover, the stability was remarkably enhanced for nanoaggregate SAPO-34. The greater external surface area and larger number of external surface acid sites are helpful in improving the catalytic performance and avoiding coke deposition.
研究领域:
石油化工
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材料科学
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催化化学
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
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2022
·Vol. 6
·期 10
·2449-2461
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IF 6.813
Hongxing Wang,Yueqing Wang,Long Huang,Anying Geng,Fengjiao Yi,Yulei Zhu,Yongwang Li
Highly efficient synthesis of 1,4-pentanediol (1,4-PDO) from industrialized biomass-based products is still a challenge due to the inherent chemical stability of intermediate product γ-valerolactone. The aim of the present research was to evaluate the influence of the synthetic conditions of CuMgAl layered double hydroxides on their physicochemical properties as well as catalytic performance in pure ethyl levulinate hydrogenation to produce 1,4-PDO in fixed-bed reactors. Systematic characterization results demonstrated that the CuMgAl catalyst prepared with mixed alkali as the precipitant has appropriate amounts of acid-base sites and a higher electron cloud density of Cu, which could well activate the carbonyl functional groups in the substrate molecule, and thus excellent reaction performance can be obtained. Ultimately, two-stage-packed dual solid catalysts in fixed-bed reactors were designed for one-step conversion of industrial furfuryl alcohol (FOL) to 1,4-PDO through an alcoholysis hydrogenation integrated continuous process. 94.3% yield of 1,4-PDO can be obtained from FOL in this effective tandem reaction.
研究领域:
生物化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2023
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IF 4.3
Mingguang Yu,Baosong Wang,Ying Wang,Yuan Tang,Chen Liu,Huanlu Song,Baochao Hou,Baolei Li,Wen Zhao
Odor is an important attribute of fermented dairy products and is an important factor in determining consumer acceptance. However, the odor characteristics of brown lactobacillus beverage (BLB) and the differences in odor among different types of these products have rarely been studied. Here, a comprehensive analysis of different types of BLB were performed by SPME–GC–O–MS and SPME–GC×GC–O–MS techniques based on untargeted metabolomics. Compared with SPME–GC–O–MS, SPME–GC×GC–O–MS identified 26 new odor compounds in BLB, indicating that this method is more suitable for odor characterization of BLB. A total of 149 odor compounds were identified from 13 BLBs, of which 40 were odor-active compounds. Ketones , alcohols, acids, aldehydes, and esters accounted for about 80% of the total odor compounds and constituted the basic odor profile of the BLB. In addition to identifying indicator flavor compounds such as furfuryl alcohol , octanoic acid , and β -myrcene, which are responsible for the differences in odor profiles between different BLBs, the reference content ranges in BLBs were precisely quantified. These findings will provide new insights into the species traceability and odor characterization of BLB samples.
研究领域:
食品科学
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分析化学
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微生物学
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代谢组学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）