498-00-0Relevant articles and documents
Hydrodeoxygenation of vanillin over carbon nanotube-supported Ru catalysts assembled at the interfaces of emulsion droplets
Yang, Xiaomin,Liang, Yu,Cheng, Yanyan,Song, Wei,Wang, Xiaofeng,Wang, Zichen,Qiu, Jieshan
, p. 28 - 31 (2014)
Carbon nanotube supported ruthenium catalysts, assembled at the water/oil interfaces, show excellent activity and selectivity for the hydrodeoxygenation of the bio-oil model compound of vanillin under mild conditions (1 MPa, 150 C). Based on a direct fluorescence image, the Ru/CNT catalysts are mainly distributed on the surface of the emulsion droplets, forming a Pickering emulsion. Simultaneous reaction and separation of the products are achieved in the constructed emulsions, which have great potential in the simplifications of the isolation and purification stages for bio-oil refining.
RETRACTED ARTICLE: Room-temperature hydrogenation of levulinic acid by uniform nano-TiO2 supported Ru catalysts
Li, Guoqiang,Yang, Huanhuan,Cheng, Mei,Hu, Wei,Tian, Lihong,Mao, Wuxiang,Nie, Renfeng
, p. 95 - 102 (2018)
Uniform TiO2 nanoparticles (NPs) is synthesized by a facile hydrothermal approach and used as support for Ru NPs. It is found that HF amount has a considerable influence in the size and uniformity of TiO2 NPs, and the optimized Ru/TiO2-0.4 is highly efficient for fast room-temperature hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) in water. For example, Ru/TiO2-0.4 Exhibits 5.1 times higher activity in comparison with commercial TiO2 supported Ru (Ru/TiO2-C), and affords 97.4% LA conversion and >99% GLV selectivity at 30 °C and 1 MPa H2 for 30 min. In particular, Ru/TiO2-0.4 can even reach 88.5% LA conversion at lower temperature to 10 °C. This catalyst is stable for recycle and also affords good conversion as well as high selectivity for hydrodeoxygenation (HDO) of biomass-derived vanillin, attributed to smaller sized TiO2 NPs, easier electron donation from TiO2 to Ru and higher reducibility of Ru species.
Highly dispersed nickel anchored on a N-doped carbon molecular sieve derived from metal-organic frameworks for efficient hydrodeoxygenation in the aqueous phase
Fan, Ruoyu,Fan, Ruoyu,Hu, Zhi,Hu, Zhi,Chen, Chun,Zhu, Xiaoguang,Zhang, Haimin,Zhang, Yunxia,Zhao, Huijun,Zhao, Huijun,Wang, Guozhong
, p. 6696 - 6699 (2020)
ZIF-8 was employed as a template to synthesize HD-Ni/N-CMS containing highly dispersed Ni at the atomic level anchored on a N-doped carbon molecular sieve for vanillin hydrodeoxygenation. The ZIF-8 structure was inherited and Ni-N bonds were formed by the coordination of Ni with N-rich defects, therefore it exhibited a high turnover frequency (1047.1 h-1) and good stability.
A short-chain dehydrogenase plays a key role in cellulosic D-lactic acid fermentability of Pediococcus acidilactici
Qiu, Zhongyang,Fang, Chun,Gao, Qiuqiang,Bao, Jie
, (2020)
Phenolic aldehydes from lignocellulose pretreatment are strong inhibitors of cell growth and metabolism of cellulosic lactic acid bacteria. Their low solubility and recalcitrance highly reduce the removal efficiency of various detoxification methods. This study shows a simultaneous conversion of phenolic aldehydes and fermentation of D-lactic acid by Pediococcus acidilactici using corn stover feedstock. Vanillin was found to be the strongest phenolic aldehyde inhibitor to P. acidilactici. The overexpression of a short-chain dehydrogenase encoded by the gene CGS9114_RS09725 from Corynebacterium glutamicum was identified to play a key role in D-lactic acid fermentability of P. acidilactici. The engineered P. acidilactici with the genome integration of CGS9114_RS09725 showed the accelerated vanillin reduction and improved cellulosic D-lactic acid production. This study reveals that vanillin conversion is crucial for D-lactic acid fermentation, and the direct expression of a specific vanillin reduction gene in lactic acid bacterium efficiently improves cellulosic D-lactic acid production.
Au/CNTs catalyst for highly selective hydrodeoxygenation of vanillin at the water/oil interface
Yang, Xiaomin,Liang, Yu,Zhao, Xu,Song, Yifan,Hu, Lianghai,Wang, Xiaofeng,Wang, Zichen,Qiu, Jieshan
, p. 31932 - 31936 (2014)
Au/CNTs assembled at the interfaces of a Pickering emulsion are reported, for the first time, exhibiting good catalytic activity and 100% selectivity for the hydrodeoxygenation of vanillin to p-creosol under mild reaction conditions. Simultaneous reaction and separation of the target products are achieved, which leads to substantial simplification of the separation and purification process for bio-oil upgrading.
Palladium nanoparticles stabilized with N-doped porous carbons derived from metal-organic frameworks for selective catalysis in biofuel upgrade: The role of catalyst wettability
Chen, Yu-Zhen,Cai, Guorui,Wang, Yanmei,Xu, Qiang,Yu, Shu-Hong,Jiang, Hai-Long
, p. 1212 - 1217 (2016)
Palladium nanoparticles were firstly stabilized with metal-organic framework-derived porous carbon for biofuel upgrade, where the catalyst wettability is crucial. The remarkable catalytic performance of Pd/NPC-ZIF-8 in water can be attributed to the well-dispersed and electron-rich Pd sites, high surface area and hierarchical pores, as well as the favorable hydrophilicity of NPC-ZIF-8.
Cobalt Nanoparticles Supported on Nitrogen-Doped Carbon: An Effective Non-Noble Metal Catalyst for the Upgrade of Biofuels
Jiang, Liang,Zhou, Peng,Liao, Chanjuan,Zhang, Zehui,Jin, Shiwei
, p. 959 - 964 (2018)
A new method has been developed for the deoxygenation of vanillin to produce 2-methoxy-4-methylphenol (MMP) as a promising liquid fuel over a heterogeneous non-noble metal catalyst. Cobalt nanoparticles supported on nitrogen-doped carbon (Co/N-C-600) exhibit high activity and stability for the deoxygenation of vanillin into MMP under mild conditions (150 °C, 10 bar H2). Nearly quantitative MMP yield is obtained in isopropanol after 8 h at 150 °C and 10 bar H2 pressure. According to the distribution of products with time, the deoxygenation of vanillin into MMP mainly proceeds through the hydrogenation of vanillin into vanillyl alcohol and the subsequent hydrogenolysis of vanillyl alcohol into MMP, of which the latter is the rate-determining step, owing to a much higher activation energy. Moreover, after being recycled several times, the loss of catalytic activity is negligible, which demonstrates that the Co/N-C-600 catalyst shows good resistance to deactivation.
Highly Dispersed Copper Nanoparticles Supported on Activated Carbon as an Efficient Catalyst for Selective Reduction of Vanillin
Fan, Ruoyu,Chen, Chun,Han, Miaomiao,Gong, Wanbing,Zhang, Haimin,Zhang, Yunxia,Zhao, Huijun,Wang, Guozhong
, (2018)
Highly dispersed copper nanoparticles (Cu NPs) supported on activated carbon (AC) are effectively synthesized by one-pot carbothermal method at temperature range of 400–700 °C. The X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis reveal that Cu NPs with diameters of 20–30 nm are evenly anchored in carbon matrix. The 15 wt%-Cu/AC-600 catalyst (derived at 600 °C) exhibits best bifunctional catalysis of aqueous-phase hydrodeoxygenation (HDO) and organic-phase transfer-hydrogenation reaction (THR) to selectively transform vanillin to 2-methoxy-4-methylphenol (MMP). In HDO of vanillin, the as-prepared catalyst achieves a 99.9% vanillin conversion and 93.2% MMP selectivity under 120 °C, 2.0 MPa H2 within 5 h. Meanwhile, near-quantitative vanillin conversion and 99.1% MMP selectivity are also obtained under 180 °C within 5 h in THR of vanillin by using 2-propanol as hydrogen donor. The transforming pathways of vanillin are also proposed: vanillin is transformed into MMP via intermediate of 4-hydroxymethyl-2-methoxyphenol in HDO case and by direct hydrogenolysis of vanillin in THR course. More importantly, the activity and the selectivity do not change after 5 cycles, indicating the catalyst has excellent stability. The Cu-based catalyst is relatively cheap and preparation method is facile, green, and easy scale-up, thus achieving a low-cost transformation of biomass to bio-oils and chemicals.
Surfactant-free Pd nanoparticles immobilized to a metal-organic framework with size- and location-dependent catalytic selectivity
Aijaz, Arshad,Zhu, Qi-Long,Tsumori, Nobuko,Akita, Tomoki,Xu, Qiang
, p. 2577 - 2580 (2015)
Surfactant-free Pd nanoparticles, immobilized to a metal-organic framework (MIL-101), have been used for the first time as highly active and durable catalysts in water for biomass refining (hydrodeoxygenation of vanillin, a typical compound of lignin) with metal nanoparticle size- and location-dependent catalytic activity and selectivity. This journal is
Click inspired synthesis of triazole-linked vanillin glycoconjugates
Dwivedi, Pratibha,Mishra, Kunj B.,Pritika,Mishra, Bhuwan B.,Tiwari, Vinod K.
, p. 61 - 70 (2017)
The 1,3-dipolar cycloaddition of deoxy-azido sugars 1 with alkyne derivatives of p-vanillin, 3-methoxy-4-(prop-2-ynyloxy)benzaldehyde (2) and 2-methoxy-1-(prop-2-ynyloxy)-4-((prop-2-ynyloxy)methyl)benzene) (4) to afford regioselective triazole-linked vanillinglycoconjugates 5 and 6 was investigated in the presence of CuI/DIPEA in dichloromethane. All the developed glycoconjugates were characterized on the basis of IR, NMR, and MS. [Figure not available: see fulltext.]
