Heteropoly acid and ZrO2 bifunctionalized organosilica hollow nanospheres for esterification and transesterification

2014 ◽  
Vol 2 (34) ◽  
pp. 14127-14138 ◽  
Author(s):  
Fang Su ◽  
Sai An ◽  
Daiyu Song ◽  
Xianghuan Zhang ◽  
Bo Lu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Heteropoly Acid ◽  
Surface Hydrophobicity ◽  
Lewis Acidity ◽  
Hollow Nanospheres ◽  
Brønsted And Lewis Acidity ◽  
Enhanced Surface

H3PW12O40/ZrO2-Et-HNS materials with strong Brönsted and Lewis acidity, unique hollow nanospherical morphology and enhanced surface hydrophobicity exihibit excellent catalytic activity.

A novel fluoride-doped aluminium oxide catalyst with tunable Brønsted and Lewis acidity

2018 ◽  
Vol 8 (5) ◽  
pp. 1404-1413 ◽  
Author(s):  
Lukas Ahrem ◽  
Jakob Wolf ◽  
Gudrun Scholz ◽  
Erhard Kemnitz
Keyword(s):  
Catalytic Activity ◽  
Oxide Catalyst ◽  
Aluminium Oxide ◽  
Lewis Acidity ◽  
Brønsted And Lewis Acidity ◽  
Fluoride Doping

The Graphical Abstract image shows the influence of fluoride doping and temperature on the catalytic activity.

Isomerization ofn-butane on sulfated zirconia: Evidence for the dominant role of Lewis acidity on the catalytic activity

1994 ◽  
Vol 26 (3-4) ◽  
pp. 339-344 ◽  
Author(s):  
F. Pinna ◽  
M. Signoretto ◽  
G. Strukul ◽  
G. Cerrato ◽  
C. Morterra
Keyword(s):  
Catalytic Activity ◽  
Sulfated Zirconia ◽  
Dominant Role ◽  
Lewis Acidity

scholarly journals Borenium ionic liquids as catalysts for Diels–Alder reaction: tuneable Lewis superacids for catalytic applications

2017 ◽  
Vol 7 (5) ◽  
pp. 1045-1049 ◽  
Author(s):  
K. Matuszek ◽  
S. Coffie ◽  
A. Chrobok ◽  
M. Swadźba-Kwaśny
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Alder Reaction ◽  
Diels Alder ◽  
Lewis Acidity ◽  
High Catalytic Activity ◽  
Acceptor Number ◽  
Diels Alder Reaction ◽  
Catalytic Applications

Ionic liquids with Lewis superacidic borenium cations were used as catalysts in solvent-less Diels–Alder cycloaddition. The extremely high catalytic activity correlated with the Lewis acidity, expressed as the Gutmann acceptor number.

scholarly journals Phase separation synthesis of trinickel monophosphide porous hollow nanospheres for efficient hydrogen evolution

2016 ◽  
Vol 4 (28) ◽  
pp. 10925-10932 ◽  
Author(s):  
Lihuang Jin ◽  
Han Xia ◽  
Zhipeng Huang ◽  
Cuncai Lv ◽  
Jie Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Phase Separation ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Hollow Nanospheres

A facile and scalable approach to synthesize trinickel monophosphide (Ni3P) porous hollow nanospheres (PHNs) has been developed, the resultant Ni3P PHNs exhibiting excellent catalytic activity in the hydrogen evolution reaction (HER).

Synthesis of 5-Acetylacenaphthene Using Silica-Supported Phosphotungstic Heteropoly Acid as an Efficient and Reusable Catalyst

2012 ◽  
Vol 560-561 ◽  
pp. 214-220
Author(s):  
Ai Xia Pan ◽  
Yin Yin Wu ◽  
Yu Fang ◽  
Lu Lu Xu ◽  
Min Chen
Keyword(s):  
Catalytic Activity ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Benzoyl Chloride ◽  
Heteropoly Acid ◽  
Environmentally Benign ◽  
Reusable Catalyst ◽  
Acylation Reaction ◽  
Experimental Parameters ◽  
Ft Ir

To obtain new fine chemical and intermediate of functional polymer material, the acylation of acenaphthene with benzoyl chloride to 5-acetylacenaphthene catalyzed by silica-supported phosphotungstic heteropoly acid (PW/SiO2) was investigated. Pure 5-acetylacenaphthene was obtained and its structure was identified by GC/MS, FT-IR and 1H NMR spectra. The effects of experimental parameters on the catalytic acylation reaction and the possibility of reusability of PW/SiO2 catalyst were studied. Under optimun conditions, the yield and the selectivity of 5-acetylacenaphthene were up to 81.3 % and 93.6 %, respectively. PW/SiO2 shows well catalytic activity after running for 5 times. The experimental results indicate that PW/SiO2 is a recyclable and environmentally benign catalyst in the synthesis of 5-acetylacenaphthene.

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