Coating with mesoporous silica remarkably enhances the stability of the highly active yet fragile flower-like MgO catalyst for dimethyl carbonate synthesis

2013 ◽  
Vol 49 (54) ◽  
pp. 6093 ◽  
Author(s):  
Zhi-Min Cui ◽  
Zhe Chen ◽  
Chang-Yan Cao ◽  
Wei-Guo Song ◽  
Lei Jiang
Keyword(s):  
Mesoporous Silica ◽  
Dimethyl Carbonate ◽  
Highly Active ◽  
The Stability

Synthesis of carbonate esters by carboxymethylation using NaAlO2 as a highly active heterogeneous catalyst

2018 ◽  
Author(s):  
Sreerangappa Ramesh ◽  
Kiran Indukuri ◽  
Olivier Riant ◽  
Damien Debecker
Keyword(s):  
Heterogeneous Catalyst ◽  
Dimethyl Carbonate ◽  
Sodium Aluminate ◽  
High Yield ◽  
Solid Catalyst ◽  
Highly Active ◽  
Aromatic Alcohols ◽  
Green Conditions ◽  
Mixed Carbonate

<p>Sodium aluminate is presented as a highly active heterogeneous catalyst able to convert a range of alcohols into the corresponding mixed carbonate esters, in high yield and under green conditions. The reaction is carried out using dimethyl carbonate both as a reactant and solvent, at 90°C. Allylic, aliphatic and aromatic alcohols are converted in good yields. The solid catalyst is shown to be truly heterogeneous, resistant to leaching, and recyclable. </p>

scholarly journals Inside Back Cover: Highly Active and Stable Palladium Nanoparticles Encapsulated in a Mesoporous Silica Yolk-Shell Nanoreactor for Suzuki-Miyaura Reactions (ChemCatChem 16/2015)

ChemCatChem ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 2542-2542 ◽  
Author(s):  
Fang Wei ◽  
Changyan Cao ◽  
Yongbin Sun ◽  
Shuliang Yang ◽  
Peipei Huang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Palladium Nanoparticles ◽  
Back Cover ◽  
Highly Active

On the stability of a mathematical model for HIV(AIDS) - cancer dynamics

2021 ◽  
Vol 8 (4) ◽  
pp. 783-796
Author(s):  
H. W. Salih ◽  
◽  
A. Nachaoui ◽  
Keyword(s):  
Mathematical Model ◽  
Highly Active Antiretroviral Therapy ◽  
Lyapunov Method ◽  
Equilibrium Points ◽  
Hiv Treatment ◽  
Biochemical Processes ◽  
Highly Active ◽  
Biological Phenomena ◽  
The Stability ◽  
The Impact

In this work, we study an impulsive mathematical model proposed by Chavez et al. [1] to describe the dynamics of cancer growth and HIV infection, when chemotherapy and HIV treatment are combined. To better understand these complex biological phenomena, we study the stability of equilibrium points. To do this, we construct an appropriate Lyapunov function for the first equilibrium point while the indirect Lyapunov method is used for the second one. None of the equilibrium points obtained allow us to study the stability of the chemotherapeutic dynamics, we then propose a bifurcation of the model and make a study of the bifurcated system which contributes to a better understanding of the underlying biochemical processes which govern this highly active antiretroviral therapy. This shows that this mathematical model is sufficiently realistic to formulate the impact of this treatment.

scholarly journals Evaluation on the Stability of Amine-Mesoporous Silica Adsorbents used for CO2 Capture

2020 ◽  
Vol 36 (1) ◽  
Author(s):  
Dang Viet Quang ◽  
Dao Van Duong ◽  
Vu Thi Hong Ha ◽  
Dao Sy Duc ◽  
Tran Thi Ngoc Dung ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Co2 Capture ◽  
Capture Process ◽  
Silica Substrate ◽  
Humid Condition ◽  
Silica Adsorbents ◽  
Reduction Of Energy Consumption ◽  
The Stability ◽  
Co2 Adsorption Capacity ◽  
Co2 Capture Capacity

Amine-mesoporous silica has been considered as a promising CO2 adsorbent with high potential for the reduction of energy consumption and CO2 capture cost; however, its stability could greatly vary with synthetic method. In this study, adsorbents prepared by impregnating different amines including polyethylenimine (PEI) and 3-aminopropyltriethoxysilane (APTES) onto mesoporous silica were used to evaluate the effect of amines selection on the stability of adsorbents used in CO2 capture process. Results revealed that APTES impregnated mesoporous silica (APTES-MPS) is more stable than PEI-impregnated mesoporous silica (PEI-MPS); APTES-MPS was thermally decomposed at ≈280 oC, while PEI-MPS was thermally decomposed at ≈180 oC only. PEI-MPS was particularly less stable when operating under dry condition; its CO2 adsorption capacity reduced by 22.1% after 10 adsorption/regeneration cycles, however, the capacity can be significantly improved in humid condition. APTES-MPS showed a greater stability with no significant reduction in CO2 capture capacity after 10 adsorption/regeneration cycles. In general, APTES-MPS adsorbent possesses a higher stability compared to PEI-MPS thanks to the formation of chemical bonds between amino-functional groups and mesoporous silica substrate. Keywords: Mesoporous silica; CO2 capture; Adsorption; Regeneration; Emission.

scholarly journals Anatase TiO2 nanoparticle coating on porous COK-12 platelets as highly active and reusable photocatalysts

RSC Advances ◽  
2016 ◽  
Vol 6 (52) ◽  
pp. 46678-46685 ◽  
Author(s):  
L. H. Wee ◽  
M. Meledina ◽  
S. Turner ◽  
K. Custers ◽  
S. Kerkhofs ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Organic Pollutants ◽  
Uv Light ◽  
Anatase Tio2 ◽  
Light Irradiation ◽  
Ordered Mesoporous Silica ◽  
Nanoparticle Coating ◽  
Highly Active ◽  
Uv Light Irradiation ◽  
Ordered Mesoporous

Coating of anatase TiO2 nanoparticles on ordered mesoporous silica COK-12 platelets for effective photodegradation of various organic pollutants under UV light irradiation.

scholarly journals Adsorption Behavior and Electron Structure Engineering of Pd-Based Catalysts for Acetylene Hydrochlorination

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 24 ◽  
Author(s):  
Yaqing Cen ◽  
Yuxue Yue ◽  
Saisai Wang ◽  
Jinyue Lu ◽  
Bolin Wang ◽  
...  
Keyword(s):  
Palladium Catalysts ◽  
Influence Factor ◽  
Catalytic Performance ◽  
Electron Structure ◽  
Acetylene Hydrochlorination ◽  
Practical Applications ◽  
Highly Active ◽  
New Strategy ◽  
Function Relationship ◽  
The Stability

Adsorption and activation for substrates and the stability of Pd species in Pd-based catalysts are imperative for their wider adoption in industrial and practical applications. However, the influence factor of these aspects has remained unclear. This indicates a need to understand the various perceptions of the structure–function relationship that exists between microstructure and catalytic performance. Herein, we revisit the catalytic performance of supported-ionic-liquid-phase stabilized Pd-based catalysts with nitrogen-containing ligands as a promoter for acetylene hydrochlorination, and try to figure out their regulation. We found that the absolute value of the differential energy, |Eads(C2H2)-Eads(HCl)|, is negative correlated with the stability of palladium catalysts. These findings imply that the optimization of the electron structure provides a new strategy for designing highly active yet durable Pd-based catalysts.

Palladium nanoparticles supported on 1,3-dicyclohexylguanidine functionalized mesoporous silica SBA-15 as highly active and reusable catalyst for the Suzuki–Miyaura cross-coupling reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20098-20107 ◽  
Author(s):  
Hojat Veisi ◽  
Abbas Amini Manesh ◽  
Neda Eivazi ◽  
Ali Reza Faraji
Keyword(s):  
Mesoporous Silica ◽  
Palladium Nanoparticles ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Reusable Catalyst ◽  
Suzuki Reactions ◽  
Highly Active ◽  
Functionalized Mesoporous Silica ◽  
Cross Coupling Reaction ◽  
Nano Catalyst

The synthesis and application of SBA-15/1,3-DCG/Pd as a novel heterogeneous and reusable nano catalyst in Suzuki reactions was described.

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