Catalytic Transfer Hydrogenation of Biomass Derived 5-Hydroxymethylfurfural into 2,5-Dimethylfuran in a Methanol Medium

2020 ◽  
Vol 14 (2) ◽  
pp. 220-226 ◽  
Author(s):  
Kaili Zhang ◽  
Danni Li ◽  
Ying Liu ◽  
Shubin Wu
Keyword(s):  
Nickel Content ◽  
Mesoporous Molecular Sieve ◽  
Transfer Hydrogenation ◽  
Ordered Mesoporous ◽  
High Nickel ◽  
Catalytic Transfer ◽  
Methanol Medium ◽  
The Difference ◽  
Catalytic Effects

The hydrogenation of HMF has been conducted in a methanol medium, which served as hydrogen donor and solvent. Without any additive, HMF was hydrogenated to 2,5-dimethylfuran (DMF) with complete conversion and selectivity (64%) using well-ordered mesoporous MCM-41 with high nickel content as catalyst at 190 °C in 5 h. Two kinds of mesoporous molecular sieve catalysts were prepared by impregnation and in-situ synthesis. Different reaction parameters such as the amount of Ni, reaction time and temperature were optimized to achieve the highest catalytic activity. Moreover, the plausible reasons for the difference in catalytic effects between the two types of catalysts were also discussed.

scholarly journals Catalytic Transfer Hydrogenation and Acid Reactions of Furfural and 5-(Hydroxymethyl)Furfural over Hf-TUD-1 Type Catalysts

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7203
Author(s):  
Margarida M. Antunes ◽  
Andreia F. Silva ◽  
Carolina D. Bernardino ◽  
Auguste Fernandes ◽  
Filipa Ribeiro ◽  
...  
Keyword(s):  
Kinetic Modelling ◽  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
Reaction Conditions ◽  
Renewable Chemicals ◽  
Hydroxymethyl Furfural ◽  
Platform Chemicals ◽  
Initial Substrate ◽  
Ordered Mesoporous ◽  
Catalytic Transfer

Heterogeneous catalysis, which has served well the petrochemical industry, may valuably contribute towards a bio-based economy by sustainably enabling selective reactions to renewable chemicals. Carbohydrate-containing matter may be obtained from various widespread sources and selectively converted to furanic platform chemicals: furfural (Fur) and 5-(hydroxymethyl)furfural (Hmf). Valuable bioproducts may be obtained from these aldehydes via catalytic transfer hydrogenation (CTH) using alcohols as H-donors under relatively moderate reaction conditions. Hafnium-containing TUD-1 type catalysts were the first of ordered mesoporous silicates explored for the conversion of Fur and Hmf via CTH/alcohol strategies. The materials promoted CTH and acid reactions leading to the furanic ethers. The bioproducts spectrum was broader for the reaction of Fur than of Hmf. A Fur reaction mechanism based on literature data was discussed and supported by kinetic modelling. The influence of the Hf loading and reaction conditions (catalyst load, type of alcohol H-donor, temperature, initial substrate concentration) on the reaction kinetics was studied. The reaction conditions were optimized to maximize the yields of 2-(alkoxymethyl)furan ethers formed from Fur; up to 63% yield was reached at 88% Fur conversion, 4 h/150 °C, using Hf-TUD-1(75), which was a stable catalyst. The Hf-TUD-1(x) catalysts promoted the selective conversion of Hmf to bis(2-alkoxymethyl)furan; e.g., 96% selectivity at 98% Hmf conversion, 3 h/170 °C for Hf-TUD-1(50).

Porous LaFeO3 Prepared by an in Situ Carbon Templating Method for Catalytic Transfer Hydrogenation Reactions

2019 ◽  
Vol 11 (17) ◽  
pp. 15517-15527 ◽  
Author(s):  
Ping Xiao ◽  
Junjiang Zhu ◽  
Dan Zhao ◽  
Zhen Zhao ◽  
Francisco Zaera ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
Templating Method ◽  
Hydrogenation Reactions ◽  
Catalytic Transfer

Techno-economic analysis and life-cycle assessment of jet fuels production from waste cooking oil via in situ catalytic transfer hydrogenation

2020 ◽  
Vol 160 ◽  
pp. 428-449
Author(s):  
Elena Barbera ◽  
Rustem Naurzaliyev ◽  
Alexander Asiedu ◽  
Alberto Bertucco ◽  
Eleazer P. Resurreccion ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Economic Analysis ◽  
Waste Cooking Oil ◽  
Transfer Hydrogenation ◽  
Jet Fuels ◽  
Catalytic Transfer Hydrogenation ◽  
Cooking Oil ◽  
Catalytic Transfer

MAGNIFER 8105, 8105 So

Alloy Digest ◽  
2001 ◽  
Vol 50 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Content ◽  
Heat Treating ◽  
Soft Magnetic ◽  
Magnetic Alloys ◽  
Soft Magnetic Alloys ◽  
Recording Heads ◽  
High Nickel

Abstract Magnifer 8105 and 8105 So are soft magnetic alloys with a high nickel content. Typical applications for 8105 are recording heads, while 8105 So has additional applications. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-575. Producer or source: Krupp VDM GmbH.

Comparison of Mammography and Ultrasonography for Tumor Size of DCIS of Breast Cancer

2019 ◽  
Vol 15 (2) ◽  
pp. 209-213
Author(s):  
Yu Wang ◽  
Jiantao Wang ◽  
Haiping Wang ◽  
Xinyu Yang ◽  
Liming Chang ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Correlation Coefficient ◽  
Tumor Size ◽  
Ductal Carcinoma ◽  
Pearson Correlation ◽  
Dense Breast ◽  
Pathological Examination ◽  
Negative Group ◽  
The Difference

Objective: Accurate assessment of breast tumor size preoperatively is important for the initial decision-making in surgical approach. Therefore, we aimed to compare efficacy of mammography and ultrasonography in ductal carcinoma in situ (DCIS) of breast cancer. Methods: Preoperative mammography and ultrasonography were performed on 104 women with DCIS of breast cancer. We compared the accuracy of each of the imaging modalities with pathological size by Pearson correlation. For each modality, it was considered concordant if the difference between imaging assessment and pathological measurement is less than 0.5cm. Results: At pathological examination tumor size ranged from 0.4cm to 7.2cm in largest diameter. For mammographically determined size versus pathological size, correlation coefficient of r was 0.786 and for ultrasonography it was 0.651. Grouped by breast composition, in almost entirely fatty and scattered areas of fibroglandular dense breast, correlation coefficient of r was 0.790 for mammography and 0.678 for ultrasonography; in heterogeneously dense and extremely dense breast, correlation coefficient of r was 0.770 for mammography and 0.548 for ultrasonography. In microcalcification positive group, coeffient of r was 0.772 for mammography and 0.570 for ultrasonography. In microcalcification negative group, coeffient of r was 0.806 for mammography and 0.783 for ultrasonography. Conclusion: Mammography was more accurate than ultrasonography in measuring the largest cancer diameter in DCIS of breast cancer. The correlation coefficient improved in the group of almost entirely fatty/ scattered areas of fibroglandular dense breast or in microcalcification negative group.

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