Thiol-ene click chemistry synthesis of a novel magnetic mesoporous silica/chitosan composite for selective Hg(II) capture and high catalytic activity of spent Hg(II) adsorbent

2021 ◽  
Vol 405 ◽  
pp. 126743
Author(s):  
Haifeng He ◽  
Xiangying Meng ◽  
Qinyan Yue ◽  
Weiyan Yin ◽  
Yue Gao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Click Chemistry ◽  
High Catalytic Activity ◽  
Chitosan Composite ◽  
Magnetic Mesoporous Silica

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 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.

scholarly journals Aerobic oxidative desulfurization via magnetic mesoporous silica-supported tungsten oxide catalysts

2020 ◽  
Vol 17 (5) ◽  
pp. 1422-1431
Author(s):  
Wei Jiang ◽  
Xiang Gao ◽  
Lei Dong ◽  
Jin Xiao ◽  
Lin-Hua Zhu ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Tungsten Oxide ◽  
Molecular Oxygen ◽  
Sulfur Removal ◽  
Oxidative Desulfurization ◽  
High Catalytic Activity ◽  
Diesel Fuels ◽  
Magnetically Separable Catalyst ◽  
Ft Ir ◽  
Magnetic Mesoporous Silica

Abstract It is usually difficult to remove dibenzothiophenes from diesel fuels by oxidation with molecular oxygen as an oxidant. In the study, tungsten oxide was supported on magnetic mesoporous silica by calcination to form a magnetically separable catalyst for oxidative desulfurization of diesel fuel. By tuning different calcining temperatures, the catalyst calcined at 500 °C showed a high catalytic activity with molecular oxygen as the oxidant. Under optimal reaction conditions, the sulfur removal of DBT reached 99.9% at 120 °C after 8 h. Furthermore, the removals of 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene could also get up to 98.2% and 92.3% under the same conditions. The reaction mechanism was explored by selective quenching experiments and FT-IR spectra.

Confinement of Pt nanoparticles in cage-type mesoporous silica SBA-16 as efficient catalysts for toluene oxidation: the effect of carboxylic groups on the mesopore surface

2019 ◽  
Vol 9 (24) ◽  
pp. 6852-6862
Author(s):  
Hung-Chi Wu ◽  
Tse-Ching Chen ◽  
Canggih Setya Budi ◽  
Pin-Hsuan Huang ◽  
Ching-Shiun Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Pt Nanoparticles ◽  
High Catalytic Activity ◽  
Toluene Oxidation ◽  
Carboxylic Groups

In this work, 3D cage-type mesoporous SBA-16 materials functionalized with –COOH groups are used to support Pt metals and provide high catalytic activity for toluene oxidation.

Isolated lithium sites supported on mesoporous silica: a novel solid strong base with high catalytic activity

2012 ◽  
Vol 48 (51) ◽  
pp. 6423 ◽  
Author(s):  
Tian-Tian Li ◽  
Lin-Bing Sun ◽  
Xiao-Yan Liu ◽  
Yuan-He Sun ◽  
Xue-Lin Song ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
High Catalytic Activity ◽  
Strong Base

Shape-Controlled Surface-Coating to Pd@Mesoporous Silica Core-Shell Nanocatalysts with High Catalytic Activity and Stability

2017 ◽  
Vol 13 (1) ◽  
pp. 31-34 ◽  
Author(s):  
Jie Ying ◽  
Christoph Janiak ◽  
Yu-Xuan Xiao ◽  
Hao Wei ◽  
Xiao-Yu Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Surface Coating ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Shape Controlled ◽  
Silica Core

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.

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