Synthesis of a hollow structured core–shell Au@CeO2–ZrO2 nanocatalyst and its excellent catalytic performance

2017 ◽  
Vol 5 (11) ◽  
pp. 5601-5611 ◽  
Author(s):  
Chenhao Du ◽  
Yun Guo ◽  
Yanglong Guo ◽  
Xue-Qing Gong ◽  
Guanzhong Lu
Keyword(s):  
Surface Area ◽  
Au Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
Core Shell ◽  
Deposition Method ◽  
Hollow Core ◽  
Excellent Catalytic Performance ◽  
Ultrathin Layer

We proposed a hard-templated and electrostatic attraction induced deposition method to prepare a hollow core–shell Au@CeO2–ZrO2 nanocatalyst with a high surface area, in which a 6–8 nm ultrathin layer composed of CeO2–ZrO2 nanocrystals is embedded with individual Au nanoparticles, forming a sub-10 nm core–shell-like structure.

Nanoparticles of Cu–Co alloy supported on high surface area LaFeO3—preparation and catalytic performance for higher alcohol synthesis from syngas

RSC Advances ◽  
2015 ◽  
Vol 5 (40) ◽  
pp. 31637-31647 ◽  
Author(s):  
Guilong Liu ◽  
Dongming Pan ◽  
Ting Niu ◽  
Ang Cao ◽  
Yizhi Yue ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
Higher Alcohol Synthesis ◽  
Higher Alcohol ◽  
Alcohol Synthesis ◽  
Excellent Catalytic Performance

Cu–Co-alloy/La2O3–LaFeO3materials with high surface area and mesoporosity were obtained. The prepared catalysts showed excellent catalytic performance for higher alcohol synthesis.

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

2020 ◽  
Author(s):  
Zi-Wen Zhou ◽  
Xiu Xing ◽  
Jun Li ◽  
Zu-E Hu ◽  
Zong-Bo Xie ◽  
...  
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 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.

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

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.

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

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.

scholarly journals Metal Nanoparticles as Green Catalysts

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3602 ◽  
Author(s):  
Neel Narayan ◽  
Ashokkumar Meiyazhagan ◽  
Robert Vajtai
Keyword(s):  
Catalytic Activity ◽  
Composite Materials ◽  
Green Synthesis ◽  
Metal Nanoparticles ◽  
Surface Area ◽  
Significant Role ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
Materials Development

Nanoparticles play a significant role in various fields ranging from electronics to composite materials development. Among them, metal nanoparticles have attracted much attention in recent decades due to their high surface area, selectivity, tunable morphologies, and remarkable catalytic activity. In this review, we discuss various possibilities for the synthesis of different metal nanoparticles; specifically, we address some of the green synthesis approaches. In the second part of the paper, we review the catalytic performance of the most commonly used metal nanoparticles and we explore a few roadblocks to the commercialization of the developed metal nanoparticles as efficient catalysts.

Core–shell-type ZIF-8@ZIF-67@POM hybrids as efficient electrocatalysts for the oxygen evolution reaction

2019 ◽  
Vol 6 (9) ◽  
pp. 2514-2520 ◽  
Author(s):  
Yan Wang ◽  
Yuyin Wang ◽  
Li Zhang ◽  
Chun-Sen Liu ◽  
Huan Pang
Keyword(s):  
Synergistic Effect ◽  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Coprecipitation Method ◽  
Core Shell ◽  
Shell Type

ZIF-8@ZIF-67@POM hybrids were synthesized using a simple coprecipitation method, and they exhibit remarkable performance in OER, with the synergistic effect between POM and ZIF species, their regular architecture and their high surface area.

Large-scale and facile synthesis of a porous high-entropy alloy CrMnFeCoNi as an efficient catalyst

2020 ◽  
Vol 8 (35) ◽  
pp. 18318-18326 ◽  
Author(s):  
Hailong Peng ◽  
Yangcenzi Xie ◽  
Zicheng Xie ◽  
Yunfeng Wu ◽  
Wenkun Zhu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Large Scale ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
High Entropy Alloy ◽  
Facile Synthesis ◽  
Efficient Catalyst ◽  
High Entropy

Porous high entropy alloy CrMnFeCoNi exhibited remarkable catalytic activity and stability toward p-nitrophenol hydrogenation. The enhanced catalytic performance not only resulted from the high surface area, but also from exposed high-index facets with terraces.

Facile synthesis of hollow hierarchical Ni/γ-Al2O3 nanocomposites for methane dry reforming catalysis

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51184-51193 ◽  
Author(s):  
Qing Zhang ◽  
Tao Wu ◽  
Peng Zhang ◽  
Ruijuan Qi ◽  
Rong Huang ◽  
...  
Keyword(s):  
Surface Area ◽  
Strong Interaction ◽  
High Surface ◽  
High Surface Area ◽  
Hollow Structure ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Facile Synthesis ◽  
Methane Dry Reforming ◽  
Accessible Surface

Hierarchical Ni/Al2O3 nanocomposite possesses a high surface area, high loading of well dispersed metal nanoparticles, and a hierarchical hollow structure. The strong interaction between metal and support and the large open accessible surface lead to excellent sintering and carbon resistance, and superior catalytic performance in methane dry reforming.

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