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In situ synthesis of biomass-derived Ni/C catalyst by self-reduction for the hydrogenation of levulinic acid to γ-valerolactone

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Journal of Energy Chemistry 2019年第10期28卷 204-214页

作者： Shuqi Fang Zhibing Cui Yuting Zhu Chenguang Wang Jing Bai Xinghua Zhang Ying Xu Qiying Liu Lungang Chen Qi Zhang Longlong Ma School of Chemical Engineering and Energy Zhengzhou UniversityZhengzhou 450001HenanChina Key Laboratory of Renewable Energy Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640GuangdongChina University of Chinese Academy of Science Beijing 100049China

Herein,we reported in situ synthesis of biomass-derived Ni/C catalyst by self-reduction with pomelo peel.Compared with the conventional method, which includes carbonization, activation, impregnation and reduction, the entire preparation process was simplified to two steps, which was more straightforward. This synthesis method was green as Ni/C can be prepared without any additional chemical and the self-reduction process was realized in N2, which can avoid using H2 thus averting some problems such as storage, transportation and safety of H2. Meanwhile, the size and dispersion of Ni particles can be controlled by changing carbonization temperature.The synthesis mechanism of Ni/C catalyst with selfreduction was investigated, which was mainly attributed to the carbon and reducing gas produced during the carbonization process.For the catalytic performance of GVL synthesis, a high yield (94.5%) can be obtained and it exhibited good stability up to 5 cycles without obvious loss of catalytic activity.

关键词： Pomelo peel Ni/C Self-reduction Hydrogenation levulinic acid γ-Valerolactone

Enzymatic Conversion of Biobased levulinic Acid into an Alternative Biofuel Candidate--Methyl Levulinate

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China Petroleum Processing & Petrochemical Technology 2020年第1期22卷 8-16页

作者： Xu Yanli Li Pan Chang Chun Xu Guizhuan Du Zeji Wang Zihua School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001 Henan Center for Outstanding Overseas Scientists Zhengzhou 450001 College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002

Methyl levulinate(ML)is a promising green candidate for bio-based diesel fuel and fuel additives.An efficient enzyme-catalyzed process to synthesize ML from levulinic acid(LA)in methanol was developed.The catalytic activity of a series of lipases including Novozyme 435(N435),NRTL IM,and 40086 was screened,and the N435 was identified as the optimal biocatalyst for the process.The effects of lipase amount,methyl tert-butyl ether(MTBE)volume,methanol to LA molar ratio,reaction temperature,and magnetic stirrer speed on LA conversion and ML yield were investigated.The response surface methodology was adopted to optimize the enzymatic conversion process,and the model validation experiments showed that the predicted values corresponded well with the experimental values.A LA conversion of 90.1%and a ML yield of 89.8%were achieved under reaction conditions covering:a temperature of 45°C,a reaction time of 4.6 h,a N435 dosage of 26 mg,a methanol to LA molar ratio of 3.6:1,a MTBE volume of 3.85 mL,and a stirrer speed of 150 r/min.The N435 recycling experiment indicated that the lipase activity was quite high after 12 cycles.However,upon using crude LA prepared from carbohydrates as the reactant,the conversion of LA and the ML yield decreased due to impurities existing in the crude LA.

关键词： enzyme methyl levulinate levulinic acid biomass

Impact of Essential Micronutrient, Zn, on Growth and Chlorophyll Biosynthesis in Young <i>Zea mays</i>Seedlings

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American Journal of Plant Sciences 2018年第9期9卷 1855-1867页

作者： R. (Chinchalkar) Waghmare R. Gadre School of Biochemistry Devi Ahilya University Takshashila Campus Indore India

The present study analyses growth and chlorophyll biosynthesis in young maize seedlings in response to Zn supply over a wide range of concentrations. Supply of 0 - 5 mM ZnCl2 to 3 days old light grown maize seedlings led to gradually increased accumulation of Zn in the shoot tissue, while in the root tissue substantial increase was observed at/and above 0.1 mM ZnCl2. Zn supply significantly reduced the overall growth of maize seedlings mostly at 1 - 5 mM ZnCl2 exerting strong correlation and the observed effect was more substantial for root tissue. Amongst the biochemical parameters, increase in protein and proline content was more prominent in root tissue than the shoot, while RNA content was reduced in shoot tissue. Zn treatment to light grown seedlings significantly increased the chlorophyll, carotenoid content, while in dark grown seedlings it had marginal/no effect. Delta amino levulinic acid (ALA) content in both the regimes was increased at higher Zn concentrations. Also ALA synthesis was increased in both the regimes, but non significantly. Zn enhanced ALA dehydratase (ALAD) activity of light as well as dark grown seedlings being significant in former. The results demonstrate that the Zn accumulation and growth effect at higher Zn concentrations in maize depend upon the tissue with root as the target site and shoot growth are mainly influenced by ALA and subsequently ALAD in maize seedlings.

关键词： Amino levulinic Acid Amino levulinic Acid Dehydratase Chlorophyll Biosynthesis Growth Effects Maize Zn Effects

日本将推出含有5-氨基乙酰丙酸磷酸盐成分的降糖保健食品

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中国食品学报 2015年第12期15卷 133-133页

据日媒报道,日本SBI ALApromo公司根据今年四月颁布的《功能性标示食品制度》,向消费者厅提交了产品名为＂ALAplus降糖＂的功能性标示食品申请,该产品适合血糖高的人群,预计12月中旬开始销售。该产品的功能成分为5-氨基乙酰丙酸磷酸盐（... 详细信息

据日媒报道,日本SBI ALApromo公司根据今年四月颁布的《功能性标示食品制度》,向消费者厅提交了产品名为＂ALAplus降糖＂的功能性标示食品申请,该产品适合血糖高的人群,预计12月中旬开始销售。该产品的功能成分为5-氨基乙酰丙酸磷酸盐（5-amino levulinic acid phosphate）。由于含有该成分,将空腹时的高血糖可调节到接近正常水平,同时延缓饭后血糖的升高。申报该产品的依据是,日本广岛大学以212名轻度高血糖者为对象所进行的临床试验,威夷大学也进行过类似试验。

关键词：氨基乙酰丙酸品质相关 levulinic 广岛大学高血糖血糖调节临床试验血糖值外包装