Synthesis of mesoporous sulfated zirconia nanoparticles with high surface area and their applies for biodiesel production as effective catalysts

Abstract Background: Production of biodiesel from renewable sources such as non-edible vegetable oils by enzymatic catalysis has been a hotspot but remains a challenge on the efficient use of an enzyme. COFs featuring large surface area and porosity should be applied as an ideal support to impede aggregation of lipase and methanol. However, the naturally low density limits its application. In this work, we reported a facile synthesis of core-shell magnetic COF composite (Fe3O4@COF-OMe) to immobilize RML (Rhizomucor miehei lipase), in order to achieve its utilization in biodiesel production.Result: This strategy gives extrinsic magnetic property, and the magnetic COFs is much heavier and could disperse in water medium well, facilitating the attachment with enzyme. The resultant biocomposite exhibited an excellent capacity of RML due to its high surface area and fast response to the external magnetic field, as well as good chemical stability. The core-shell magnetic COF-OMe structure not only achieved highly efficient immobilization and recovery processes, but also maintained the activity of lipase to a great extent. RML@Fe3O4@COF-OMe performed well in practical applications, while free lipase did not. The biocomposite successfully achieved the production of biodiesel from Jatropha curcas Oil with a yield of about 70% in the optimized conditions. Conclusion: Magnetic COFs (Fe3O4@COF-OMe) for RML immobilization greatly improved catalytic performance in template reaction and biodiesel preparation. The magneticity makes it easily recovered and separated from system. This first successful attempt of COFs-based immobilized enzyme broadened the prospect of biodiesel production by COFs with some inspiration.

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Magnetic COFs as satisfied support for lipase immobilization and recovery to effectively achieve the production of biodiesel by great maintenance of enzyme activity

Biotechnology for Biofuels ◽

10.1186/s13068-021-02001-0 ◽

2021 ◽

Vol 14 (1) ◽

Author(s):

Zi-Wen Zhou ◽

Chun-Xian Cai ◽

Xiu Xing ◽

Jun Li ◽

Zu-E. Hu ◽

...

Keyword(s):

Surface Area ◽

High Surface ◽

Enzymatic Catalysis ◽

High Surface Area ◽

Rhizomucor Miehei ◽

Catalytic Performance ◽

Biodiesel Production ◽

Core Shell ◽

Water Medium ◽

Practical Applications

Abstract Background Production of biodiesel from renewable sources such as inedible vegetable oils by enzymatic catalysis has been a hotspot but remains a challenge on the efficient use of an enzyme. COFs (Covalent Organic Frameworks) with large surface area and porosity can be applied as ideal support to avoid aggregation of lipase and methanol. However, the naturally low density limits its application. In this work, we reported a facile synthesis of core–shell magnetic COF composite (Fe3O4@COF-OMe) to immobilize RML (Rhizomucor miehei lipase), to achieve its utilization in biodiesel production. Result This strategy gives extrinsic magnetic property, and the magnetic COFs is much heavier and could disperse in water medium well, facilitating the attachment with the enzyme. The resultant biocomposite exhibited an excellent capacity of RML due to its high surface area and fast response to the external magnetic field, as well as good chemical stability. The core–shell magnetic COF-OMe structure not only achieved highly efficient immobilization and recovery processes but also maintained the activity of lipase to a great extent. RML@Fe3O4@COF-OMe performed well in practical applications, while free lipase did not. The biocomposite successfully achieved the production of biodiesel from Jatropha curcas Oil with a yield of about 70% in the optimized conditions. Conclusion Magnetic COFs (Fe3O4@COF-OMe) for RML immobilization greatly improved catalytic performance in template reaction and biodiesel preparation. The magneticity makes it easily recovered and separated from the system. This first successful attempt of COFs-based immobilized enzyme broadened the prospect of biodiesel production by COFs with some inspiration.

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Synthesis of Catalytically Active High Surface Area Monoclinic Sulfated Zirconia

Journal of Catalysis ◽

10.1006/jcat.1998.1962 ◽

1998 ◽

Vol 174 (2) ◽

pp. 242-245 ◽

Cited By ~ 45

Author(s):

Wolfram Stichert ◽

Ferdi Schüth

Keyword(s):

Surface Area ◽

Sulfated Zirconia ◽

High Surface ◽

High Surface Area ◽

Catalytically Active

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Physicochemical Characterization of Natural Diatomite from Lampang Province, Thailand as a Solid Catalyst

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.861.371 ◽

2020 ◽

Vol 861 ◽

pp. 371-377

Author(s):

Wilasinee Kingkam ◽

Sasikarn Nuchdang ◽

Pipat Laowattanabandit ◽

Dussadee Rattanaphra

Keyword(s):

Pore Size ◽

Surface Area ◽

Calcination Temperature ◽

High Surface ◽

High Surface Area ◽

Physicochemical Characterization ◽

Chemical Properties ◽

Biodiesel Production ◽

Solid Catalyst ◽

X Ray

This paper presents the studies on physical and chemical properties of the natural diatomite originating from Mae Tha District, Lampang the northern of Thailand as solid catalyst. The diatomite was characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) and nitrogen adsorption-desorption isotherm. The effect of calcination temperature on chemical composition, cyrytalline phase and textural properties of diatomite was also investigated. The XRF results indicated that the diatomite was composed mostly of SiO2, K2O, CaO and MgO. The calcination temperature ranging from 300 to 900 °C had no effect on the crystalline phase of diatiomite. The high surface area and large pore size diameter of diatomite was observed when the calcination temperature was below 900 °C. All the physicochemical results show the existence of SiO2, K2O, CaO and MgO, the high surface area and pore size diameter, indicate that the diatomite could potentially be used to a solid catalyst for biodiesel production.

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Magnetic COFs as Satisfied Support for Lipase Immobilization and Recovery to Effectively Achieve the Production of Biodiesel by Great Maintenance of Enzyme Activity

10.21203/rs.3.rs-110352/v2 ◽

2021 ◽

Author(s):

Zi-Wen Zhou ◽

Chun-Xian Cai ◽

Xiu Xing ◽

Jun Li ◽

Zu-E Hu ◽

...

Keyword(s):

Surface Area ◽

High Surface ◽

Enzymatic Catalysis ◽

High Surface Area ◽

Rhizomucor Miehei ◽

Catalytic Performance ◽

Biodiesel Production ◽

Core Shell ◽

Water Medium ◽

Practical Applications

Abstract Background: Production of biodiesel from renewable sources such as inedible vegetable oils by enzymatic catalysis has been a hotspot but remains a challenge on the efficient use of an enzyme. COFs (Covalent Organic Frameworks) with large surface area and porosity can be applied as ideal support to avoid aggregation of lipase and methanol. However, the naturally low density limits its application. In this work, we reported a facile synthesis of core-shell magnetic COF composite (Fe3O4@COF-OMe) to immobilize RML (Rhizomucor miehei lipase), to achieve its utilization in biodiesel production.Result: This strategy gives extrinsic magnetic property, and the magnetic COFs is much heavier and could disperse in water medium well, facilitating the attachment with the enzyme. The resultant biocomposite exhibited an excellent capacity of RML due to its high surface area and fast response to the external magnetic field, as well as good chemical stability. The core-shell magnetic COF-OMe structure not only achieved highly efficient immobilization and recovery processes but also maintained the activity of lipase to a great extent. RML@Fe3O4@COF-OMe performed well in practical applications, while free lipase did not. The biocomposite successfully achieved the production of biodiesel from Jatropha curcas Oil with a yield of about 70% in the optimized conditions. Conclusion: Magnetic COFs (Fe3O4@COF-OMe) for RML immobilization greatly improved catalytic performance in template reaction and biodiesel preparation. The magneticity makes it easily recovered and separated from the system. This first successful attempt of COFs-based immobilized enzyme broadened the prospect of biodiesel production by COFs with some inspiration.

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Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

10.26434/chemrxiv.7770338.v1 ◽

2019 ◽

Cited By ~ 1

Author(s):

Kailun Yang ◽

Recep Kas ◽

Wilson A. Smith

Keyword(s):

Surface Area ◽

High Surface ◽

High Surface Area ◽

Catalyst Layer ◽

Active Surface ◽

Active Surface Area ◽

High Concentration ◽

Copper Electrodes ◽

Surface Enhanced ◽

Local Current

This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO2 electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO2 electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO2 electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer.

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Rugae-like FeP nanocrystal assembly on a carbon cloth: an exceptionally efficient and stable cathode for hydrogen evolution

Nanoscale ◽

10.1039/c5nr02375k ◽

2015 ◽

Vol 7 (25) ◽

pp. 10974-10981 ◽

Cited By ~ 95

Author(s):

Xiulin Yang ◽

Ang-Yu Lu ◽

Yihan Zhu ◽

Shixiong Min ◽

Mohamed Nejib Hedhili ◽

...

Keyword(s):

Gas Phase ◽

Surface Area ◽

Hydrogen Evolution ◽

Hydrogen Generation ◽

High Surface ◽

High Surface Area ◽

Catalytic Efficiency ◽

Carbon Cloth ◽

Nanocrystal Assembly

High surface area FeP nanosheets on a carbon cloth were prepared by gas phase phosphidation of electroplated FeOOH, which exhibit exceptionally high catalytic efficiency and stability for hydrogen generation.

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