scholarly journals Interpretation of the mechanism of 3,3′-dichloro-4,4′-diamino diphenylmethane synthesis over HY zeolites

RSC Advances ◽  
2020 ◽  
Vol 10 (57) ◽  
pp. 34719-34728
Author(s):  
Xiao Ruan ◽  
Feng Wei ◽  
Li Yang ◽  
Yingxian Zhao ◽  
Qiang Wang
Keyword(s):  
Catalytic Activities ◽  
Hy Zeolites ◽  
Diaminodiphenyl Methane

Catalytic activities of zeolites HY, Hβ and HZSM-5 in the heterogeneous synthesis of 3,3′-dichloro-4,4′-diaminodiphenyl methane (MOCA) from o-chloroaniline and formaldehyde were pre-screened in an autoclave, and HY demonstrated better performance than others.

Photocatalytic activity of TiO2 synthesized by anodization and anodic spark deposition

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3141-3152
Author(s):  
Alma C. Chávez-Mejía ◽  
Génesis Villegas-Suárez ◽  
Paloma I. Zaragoza-Sánchez ◽  
Rafael Magaña-López ◽  
Julio C. Morales-Mejía ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Surface Characteristics ◽  
Amorphous Solids ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalytic Activities ◽  
Anodic Spark Oxidation ◽  
Porous Surfaces ◽  
Scanning Electron

AbstractSeveral photocatalysts, based on titanium dioxide, were synthesized by spark anodization techniques and anodic spark oxidation. Photocatalytic activity was determined by methylene blue oxidation and the catalytic activities of the catalysts were evaluated after 70 hours of reaction. Scanning Electron Microscopy and X Ray Diffraction analysis were used to characterize the catalysts. The photocatalyst prepared with a solution of sulfuric acid and 100 V presented the best performance in terms of oxidation of the dye (62%). The electric potential during the synthesis (10 V, low potential; 100 V, high potential) affected the surface characteristics: under low potential, catalyst presented smooth and homogeneous surfaces with spots (high TiO2 concentration) of amorphous solids; under low potential, catalyst presented porous surfaces with crystalline solids homogeneously distributed.

Metal-Assisted Plasma Etching of Silicon: A Liquid-Free Alternative to MACE

2018 ◽  
Author(s):  
Julia Sun ◽  
Benjamin Almquist
Keyword(s):  
Liquid Phase ◽  
Plasma Etching ◽  
Chemical Etching ◽  
Gold Films ◽  
Metallic Films ◽  
Au Catalyst ◽  
Feed Concentration ◽  
Catalytic Activities ◽  
Metal Assisted Chemical Etching ◽  
Complex Nanostructures

For decades, fabrication of semiconductor devices has utilized well-established etching techniques to create complex nanostructures in silicon. Of these, two of the most common are reactive ion etching in the gaseous phase and metal-assisted chemical etching (MACE) in the liquid phase. Though these two methods are highly established and characterized, there is a surprising scarcity of reports exploring the ability of metallic films to catalytically enhance the etching of silicon in dry plasmas via a MACE-like mechanism. Here, we discuss a <u>m</u>etal-<u>a</u>ssisted <u>p</u>lasma <u>e</u>tch (MAPE) performed using patterned gold films to catalyze the etching of silicon in an SF<sub>6</sub>/O<sub>2</sub> mixed plasma, selectively increasing the rate of etching by over 1000%. The degree of enhancement as a function of Au catalyst configuration and relative oxygen feed concentration is characterized, along with the catalytic activities of other common MACE metals including Ag, Pt, and Cu. Finally, methods of controlling the etch process are briefly explored to demonstrate the potential for use as a liquid-free fabrication strategy.

Catalytic Activities of Dialkyltin Compounds Containing Silicon to the Condensation Reaction of Acetal(Ketal)-Alcohol

2013 ◽  
Vol 30 (3) ◽  
pp. 271
Author(s):  
Sen LIN ◽  
Yangyang GUO ◽  
Ruihong DENG ◽  
Zhiqiang HUANG
Keyword(s):  
Condensation Reaction ◽  
Catalytic Activities

Discovery of high antibacterial and catalytic activities of biosynthesized silver nanoparticles using C. fruticosus (CF-AgNPs) against multi-drug resistant clinical strains and hazardous pollutants

2021 ◽  
pp. 101607
Author(s):  
Mina Shirzadi-Ahodashti ◽  
Zirar M. Mizwari ◽  
Zahra Hashemi ◽  
Saba Rajabalipour ◽  
Seyedeh Masoumeh Ghoreishi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Drug Resistant ◽  
Clinical Strains ◽  
Catalytic Activities ◽  
Hazardous Pollutants

Facile method of selective dissolution for preparation of Co3O4/LaCoO3 as bifunctional catalyst for Al/Zn-air battery

2021 ◽  
Author(s):  
Shanshan Yan ◽  
Liyang Wan ◽  
Yejian Xue ◽  
Yan Wang ◽  
Guangjie Shao ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Surface Defects ◽  
Selective Dissolution ◽  
Bifunctional Catalyst ◽  
Catalytic Activities ◽  
Air Battery

Perovskites are promising catalysts for metal-air batteries because of their excellent intrinsic catalytic activities. However, the low specific surface area and less surface defects lead to low catalytic activities regarding...

scholarly journals Borane Catalysed Cyclopropenation of Arylacetylenes

2021 ◽  
Author(s):  
Katarina Stefkova ◽  
Matthew Heard ◽  
Ayan Dasgupta ◽  
Rebecca Melen
Keyword(s):  
Catalytic Activities ◽  
Bond Forming ◽  
Bond Forming Reactions

Triarylboranes have gained substantial attention as catalysts for C–C bond forming reactions due to their remarkable catalytic activities. Herein, we report B(C6F5)3 catalysed cyclopropenation of a wide variety of arylacetylenes...

scholarly journals Acid-triggered interlayer sliding of two-dimensional copper(i)–organic frameworks: more metal sites for catalysis

2021 ◽  
Author(s):  
Hou-Gan Zhou ◽  
Ri-Qin Xia ◽  
Ji Zheng ◽  
Daqiang Yuan ◽  
Guo-Hong Ning ◽  
...  
Keyword(s):  
Chemical Stability ◽  
Two Dimensional ◽  
Catalytic Activities

The addition of TFA can trigger the interlay sliding of 2D copper(i) organic frameworks prepared by combing the chemistry of MOFs and COFs. The variation of interlay stacking largely affected the porosity, chemical stability and catalytic activities.

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