Generation of a Highly Stable Reusable Biocatalyst by Entrapment of an Oligomeric Enzyme in Ultra-Large-Pore Mesoporous Silica

2015 ◽  
Vol 68 (3) ◽  
pp. 396 ◽  
Author(s):  
Christopher B. J. MacDonald ◽  
Matthew F. Tobin ◽  
Anna E. Morrison ◽  
Mary E. Tait ◽  
Godwin B. D'Cunha ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Phenylalanine Ammonia Lyase ◽  
Pore Diameter ◽  
Mesoporous Silicas ◽  
High Catalytic Activity ◽  
Facile Synthesis ◽  
Prolonged Heating ◽  
Large Pore

Phenylalanine ammonia lyase (PAL, E.C.4.3.1.24), was entrapped in ultra-large-pore mesoporous silica (ULPS, 23 nm pore diameter) generating a recyclable, separable biocatalyst. The entrapped ULPS-PAL materials showed excellent stabilization, even after significant exposure to prolonged heating. Additionally, the entrapped ULPS-PAL materials showed extremely high catalytic activity in the deamination of l-phenylalanine to trans-cinnamic acid in aqueous solution and were recovered and recycled up to five times without any observable loss in activity. This approach is simple and capitalizes on the facile synthesis and easy recoverability of mesoporous silicas to generate a stable, reusable PAL-based biocatalyst.

Colloidal Co single-atom catalyst: a facile synthesis strategy and high catalytic activity for hydrogen generation

2020 ◽  
Vol 22 (4) ◽  
pp. 1269-1274 ◽  
Author(s):  
Junkai Wang ◽  
Zhenxia Huang ◽  
Lilin Lu ◽  
Quanli Jia ◽  
Liang Huang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Hydrogen Generation ◽  
Single Atom ◽  
High Catalytic Activity ◽  
Mixing Process ◽  
Facile Synthesis ◽  
On Demand ◽  
Synthesis Strategy ◽  
Facile Route

A facile route for on-demand hydrogen production via simply controlling the mixing process of a KBH4 solution and an aqueous solution of ISOBAM-104 stabilized Co2+ ions.

Pd colloid grafted mesoporous silica and its extraordinarily high catalytic activity for Mizoroki–Heck reactions

2010 ◽  
Vol 322 (1-2) ◽  
pp. 50-54 ◽  
Author(s):  
Yingjun Feng ◽  
Liang Li ◽  
Yongsheng Li ◽  
Wenru Zhao ◽  
Jinlou Gu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
High Catalytic Activity ◽  
Heck Reactions

scholarly journals Facile Synthesis of Large-Pore Bicontinuous Cubic Mesoporous Silica Nanoparticles for Intracellular Gene Delivery

ChemNanoMat ◽  
2016 ◽  
Vol 2 (3) ◽  
pp. 220-225 ◽  
Author(s):  
Anand Kumar Meka ◽  
Yuting Niu ◽  
Surajit Karmakar ◽  
Sandy Budi Hartono ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Gene Delivery ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Facile Synthesis ◽  
Large Pore ◽  
Bicontinuous Cubic ◽  
Cubic Mesoporous

PtAu alloy nanoparticles supported on thermally expanded graphene oxide as a catalyst for the selective oxidation of glycerol

RSC Advances ◽  
2015 ◽  
Vol 5 (47) ◽  
pp. 37112-37118 ◽  
Author(s):  
Gao-Yuan Yang ◽  
Shuai Shao ◽  
Yi-Hu Ke ◽  
Chun-Ling Liu ◽  
Hui-Fang Ren ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Selective Oxidation ◽  
High Catalytic Activity ◽  
Alloy Nanoparticles

Thermally expanded graphene oxide supported PtAu alloy nanoparticles showed high catalytic activity in the oxidation of glycerol in base-free aqueous solution.

scholarly journals Preparation of an Active Ni2B/SBA-15 Catalyst to Improve NaBH4 Hydrolysis for Hydrogen Generation

2015 ◽  
Vol 18 (4) ◽  
pp. 231-235
Author(s):  
Fei Wu ◽  
Ting Li ◽  
Jindan Chen ◽  
Xiu Ru Yang ◽  
Cheng Ming Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Hydrogen Generation ◽  
Sintering Temperature ◽  
Weight Ratio ◽  
High Catalytic Activity

Ni2B nanoparticle distributed on ordered SBA-15 mesoporous silica was prepared in situ and its catalytic activity for NaBH4 hydrolysis was investigated in the presented paper. The problem of Ni2B aggregation is resolved and the catalytic activity of Ni2B is also improved due to the effect of SBA-15. The catalytic activity increases with Ni2B/SBA-15 weight ratio increased from 1:4 to 2:1 and the catalyst with Ni2B/SBA-15 weight ratio of 2:1 has high catalytic activity close to that of Ni2B. The sintered experiment shows that the catalytic activity comes from amorphous Ni2B, not crystalline Ni2B. High sintering temperature leads to the conversion from amorphous Ni2B to crystalline Ni2B and damages the nanostructure of amorphous Ni2B framework.

Effect of MgO Addition on the Properties of Ni/Al2O3 and Its Catalytic Activity in Hydrogenation of N-(2`,3`-dimethoxy benzyl)-3,4-dioxy-methylene-phenylethylamine

2019 ◽  
Vol 41 (5) ◽  
pp. 796-796
Author(s):  
Guosheng Wang Guosheng Wang ◽  
Xinxin Zhao and Siyu Han Xinxin Zhao and Siyu Han
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Pore Diameter ◽  
Supported Catalysts ◽  
Bet Surface Area ◽  
High Catalytic Activity ◽  
Average Pore ◽  
Secondary Reactions ◽  
Al2o3 Support ◽  
Raney Ni

the nickel based alumina-supported catalysts modified or promoted by magnesia were prepared by wet impregnation and successfully used for hydrogenation of N-(2`,3`-dimethoxy benzyl)-3,4-dioxy-methylene-phenylethylamine, the 20Ni-6MgO/74Al2O3 samples exhibits the highest BET surface area, the largest pore volume, and the largest pore diameter in all of the samples such as Ni/Al2O3 and 20Ni-xMgO(80-x)Al2O3 excepted the highest BET surface area of Ni/Al2O3. the average pore diameter of the 20Ni-6MgO/74Al2O3 samples were two times as large as Ni/Al2O3, it was indicated that the function of expanding role or the mesoporosity was increased by addition of MgO, and MgO might be regarded as pore-enlarge agent for the bare Al2O3 support and benefit for the transport of large molecules reactants and products The weak formation of MgO-Al2O3 and MgO-NiO solid solution as a result of competing interaction of MgO with Al2O3 support and NiO precursors restrained the strong interaction of NiO species with Al2O3 support, which favored the dispersion of active Ni centers and improved the reducible degree of NiO species on the surface of the catalysts. The improvement of basicity or the decrease in the number of acid centers in the catalysts avoid the secondary reactions, and subsequently resulted in high catalytic activity. The utilization of meso-porous 20Ni-6MgO/74Al2O3 for catalytic hydrogenation of N-(2`,3`-dimethoxy benzyl)-3,4-dioxy-methylene-phenylethylamine(Shiff’s base) with the highest selectivity of 99.70% and yields of 94.36% implied that the instead of Raney Ni was feasible.

A facile synthesis of Pt@Ir zigzag bimetallic nanocomplexes for hydrogenation reactions

2015 ◽  
Vol 51 (44) ◽  
pp. 9216-9219 ◽  
Author(s):  
Jiaqing Wang ◽  
Danhua Ge ◽  
Xueqin Cao ◽  
Minghua Tang ◽  
Yue Pan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Facile Synthesis ◽  
Hydrogenation Reactions

A facile approach for the synthesis of Pt@Ir zigzag bimetallic nanocomplexes with high catalytic activity.

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