CATALYSIS COMMUNICATIONS
·
2016
·
IF 3.389
Yanhong Huang,Shuqian Xia,Peisheng Ma
The effect of zeolite solid acids on the in situ hydrogenation of bio-derived phenol over Raney Ni was investigated, which indicated that the conversion of phenol increased with the addition of zeolite solid acids and Hbeta (Si/Al = 60) showed the best performance of high phenol conversion and selectivity towards the desired products and low carbon loss. In addition, the quantity of Hbeta (Si/Al = 60) and Raney Ni had marked impact on the carbon loss, but little effect on both the conversion and the products distribution. And the mixed catalysts of Raney Ni and Hbeta (Si/Al = 60) exhibited excellent stability.
研究领域:
化学工程
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Yanyan Yu,Yilin Li,Yuhan Lou,Mengyuan Chen,Yongzhuang Liu,Haipeng Yu
Catalytic refining of lignin holds promise for producing sustainable platform chemicals. In this work, a gaseous hydrogen-free catalytic hydrodeoxygenation system is developed for upgrading lignin-derived phenols to alkane chemicals. Commercially available Raney Ni and HZSM-5 are used as a combinational catalyst, with isopropanol serving as the hydrogen-donating solvent. By modifying the temperature and the ratio of Raney Ni to HZSM-5, the reaction pathways for hydrogenation and deoxygenation can be tailored to specific requirements. As a result, a 97.1% yield of alkane fuels is achieved, with 64.4% propylcyclohexane and 32.7% propylbenzene obtained in one-pot reaction from the hydrodeoxygenation of 2-methoxy-4-propylphenol using a 3:1 mass ratio of Ni to HZSM-5, further increasing the ratio of HZSM-5 leads to a selectively production of propylbenzene in 62.0% yield. Through careful regulation of the catalytic system and the design of hydrogenation–deoxygenation pathways, excellent yields of 4-propylcyclohexanol (92.2%), propylcyclohexene (93.3%), and propylcyclohexane (93.2%) are directionally achieved. The catalyst maintained a conversion rate of over 99% after five cycles, demonstrating excellent robustness. This study offers a strategic system that expedites the selective upgrading of lignin-derived chemicals, heralding a pathway toward sustainable fuels and chemicals.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Yalun Hu,Isaac Nartey Oduro,Yong Huang,Yunming Fang
The structural characteristics and pyrolysis behaviors of two holocelluloses obtained from lignin-first biorefinery with Ru/C or Raney Ni as catalysts were studied in this paper. The infrared spectra of the remaining solid from the lignin-first biorefinery show that both lignin and a portion of hemicellulose were decomposed. Compared with Ru/C, Raney Ni was more effective for delignification and gave a holocellulose with higher degree of crystallinity, based on both the ratio of infrared bands (1372 cm −1 /2900 cm −1 ) and XRD analysis. The pyrolyses of holocelluloses were performed in fixed-bed and free-falling reactors, and the resulting char yields from both reactors were significantly higher than those of the parent biomass and commercial cellulose. This resulted from the cleavage of cellulose chain during the lignin-first biorefinery. Raney Ni related biorefinery cleaved cellulose chain to a higher degree.
研究领域:
生物化学
·
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2023
·Vol. 69
·期 7
·e18056
·
IF 3.7
Haoan Fan,Bolong Li,Xuezhi Zhao,Zhecheng Fang,Chao Chen,Wenhua Zhou,Wulong Yang,Mian Li,Xiuyang Lu,Jie Fu
The kinetics and mechanisms of selective maltose hydrogenation over Raney Ni remain poorly understood, which hinders the industrial advancement of maltitol production for biorefining. Herein, the impact of hydrogenation conditions and in-depth mechanistic characterizations were carefully investigated in this research. Optimization of reaction conditions illustrated that maltitol formation was favored by moderate reaction temperatures (≤130°C), high hydrogen pressures (>7 MPa), and near-neutral sodium phosphate buffer (pH = 6.47). Kinetic studies demonstrated the E a of 45.5 kJ/mol for the hydrogenation of maltose. The in situ IR revealed that the hydrogenation of maltose over Raney Ni occurs in the order of ring opening and adsorption via CO of the aldose form followed by hydrogenation. The UV–vis spectra demonstrated the near-neutral setting (pH = 6.47) promoted the production of open-chain aldose conformation and selective CO hydrogenation to the corresponding alcohols. The present study on concentrated-maltose hydrogenation paves the way for the industrial development of maltitol manufacturing.
研究领域:
化学工程
·
催化
·
生物化工
✓ 已验证
产品关联
DOI
高影响因子
Green Processing and Synthesis
·
2017
·Vol. 6
·期 4
·363-370
·
IF 0.782
Zhihao Li,Zhihao Bi,Lifeng Yan
As the major composite of biomass, lignin can be utilized as feedstock for valuable chemicals, especially phenols. Catalysis hydrogenation of lignin is an attractive route for the conversion. However, most of them require hydrogen gas under high pressure which is dangerous. Hydrogen transfer reaction provides an alternative route to degrade and hydrogenate lignin or its units to small molecular compounds. Here, a two-step method has been employed using Raney Ni and Pd/C catalysts consecutively for hydrogen transfer catalysis for lignin. The results reveal that lignin can be degraded efficiently about 90% during conversion, and the major products are phenols with ~30% in yield. It provides a new green method for converting natural lignin to valuable chemicals.
研究领域:
生物质化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL COMMUNICATIONS
·
2013
·Vol. 49
·期 46
·5328-5330
·
IF 6.378
Zhen Yang,Yao-Bing Huang,Qing-Xiang Guo,Yao Fu
A catalytic transfer hydrogenation process was developed for the production of γ-valerolactone (GVL) from ethyl levulinate (EL) and a H-donor at room temperature. Ethyl levulinate was almost quantitatively converted to γ-valerolactone. Further, a two step process for producing GVL from biomass derived platform molecules was also reported.
研究领域:
化学工程
·
可再生能源
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Weilai Wang,Junfeng Niu,Zhifeng Yang
Presence of unsaturated bonds and halogen-containing groups is the most common characteristic of toxic and harmful environmental pollutants. Herein, catalytic hydrogenation was chosen as a water quality control method for such contaminants. Considering the safety, availability and activity of the hydrogen source, electrochemical in situ hydrogen generation was introduced. Under the combined action of Raney Ni (R-Ni) and nascent hydrogen (Nas-H 2 ), three compounds (50 mg L −1 , 90 ml), i.e., acrylamide, 2, 6-dibromo-4-nitrophenol and 2-chloro-4-fluorobenzonitrile achieved complete hydrogenation reduction in a short time. The improved system realized the quantitative consumption of hydrogen source and the efficient operation of hydrogenation reaction under mild conditions. Additionally, the alkaline environment formed by hydrogen evolution reaction (HER) avoided secondary pollution caused by catalyst dissolution. Atomic hydrogen (H·) produced from R-Ni and Nas-H 2 was the active free radical of the reaction. The hydrogenation activities of different functional groups were obtained according to the following order: Ph-NO 2 ＞ -C = C- ＞ Ph-C≡N ＞ Ph-Br ＞ Ph-Cl ＞ Ph-F. This work indicates that the catalytic hydrogenation system consisting of R-Ni and Nas-H 2 is a promising technology to reduce unsaturated bonds and halogen-containing groups.
研究领域:
环境科学
·
化学工程
·
催化
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xiaomei Yuan,Tao Yan,Zhikun Liu,Peng Kang
Alkaline water electrolysis is one of the most promising technologies for green hydrogen production. Here, we synthesized a series of alkanolamine-modified zirconia particles by a one-pot method to construct zirconia-based composite membranes for alkaline water electrolysis. Among these membranes, the diethanolamine (DEA)-functionalized zirconia separator exhibits superior hydrophilicity with a low water contact angle of 44° and low area resistance of 0.12 Ω·cm2, which were 47 and 60%, respectively, less than that of the commercial Zirfon PERL UTP 500 separator. Conceivably, the DEA-functionalized zirconia separator presents high electrochemical performance with a current density of 1114 mA cm–2 at 2.0 V with Raney Ni as the cathode catalyst and CoMnO@CoFe layered double hydroxide (LDH) as the anode catalyst at 80 °C, closing the gap with proton exchange membrane electrolysis. In addition, the DEA-modified separator exhibits high stability for over 150 h at a high current density of 500 mA cm–2 and stable cell voltages in 30 wt % KOH at 80 °C.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2024
·
IF 10.7
Meng-Ying Liu,Zhe-Hui Zhang,Xue-Qi Wang,Qian Sun,Chen Zhang,Yu Li,Zhuohua Sun,Katalin Barta,Feng Peng,Tong-Qi Yuan
Developing a cost-effective and environmentally friendly process for the production of valuable chemicals from abundant herbal biomass receives great attentions in recent years. Herein, taking advantage of the “lignin first” strategy, corn straw is converted to valuable chemicals including lignin monomers, furfural and 5-methoxymethylfurfural via a two steps process. The key of this research lies in the development of a green and low-cost catalytic process utilizing magnetic Raney Ni catalyst and high boiling point ethylene glycol. The utilization of neat ethylene glycol as the sole slovent under atmospheric conditions obviates the need for additional additives, thereby facilitating the entire process to be conducted in glass flasks and rendering it highly convenient for scaling up. In the initial step, depolymerization of corn straw lignin resulted in a monomer yield of 18.1 wt%. Subsequently, in a dimethyl carbonate system, the carbohydrate component underwent complete conversion in a one-pot process, yielding furfural and 5-methoxymethylfurfural as the primary products with an impressive yield of 47.7 %.
研究领域:
化学工程
·
生物质转化
·
催化
·
可再生能源
✓ 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）