Luminescent Coordination Polymer with Conjugated Lewis Acid Sites for the Detection of Organic Amines

2015 ◽  
Vol 15 (10) ◽  
pp. 5040-5046 ◽  
Author(s):  
Jian-Jun Liu ◽  
Ying-Fang Guan ◽  
Mei-Jin Lin ◽  
Chang-Cang Huang ◽  
Wen-Xin Dai
Keyword(s):  
Coordination Polymer ◽  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Organic Amines

One-dimensional alignment of strong Lewis acid sites in a porous coordination polymer

2013 ◽  
Vol 49 (89) ◽  
pp. 10459 ◽  
Author(s):  
Takashi Kajiwara ◽  
Masakazu Higuchi ◽  
Akihiro Yuasa ◽  
Hideyuki Higashimura ◽  
Susumu Kitagawa
Keyword(s):  
Coordination Polymer ◽  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
One Dimensional ◽  
Strong Lewis Acid ◽  
Porous Coordination Polymer

A robust viologen and Mn-based porous coordination polymer with two types of Lewis acid sites providing high affinity for H2O, CO2 and NH3

2017 ◽  
Vol 46 (45) ◽  
pp. 15666-15670 ◽  
Author(s):  
A. Leblanc ◽  
N. Mercier ◽  
M. Allain ◽  
M.-C. Dul ◽  
G. Weber ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
High Affinity ◽  
Porous Coordination Polymer

A water stable PCP with two kinds of Lewis acid sites, open Mn2+ cations and viologen, shows high affinity for H2O, CO2 and NH3.

Synthesis of Sulfated Pt/ZrO2 Catalysts Using Different Precipitants for n-Hexane Hydroisomerization

2010 ◽  
Vol 1279 ◽  
Author(s):  
Guo-Xian Yu ◽  
Wei Panl ◽  
Xiao-Long Zhou ◽  
Li-Fang Chen ◽  
Jin-An Wang
Keyword(s):  
Lewis Acid ◽  
Crystallization Process ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Crystalline Structures ◽  
Acid Properties ◽  
Washing Process ◽  
Organic Amines

AbstractAmmonia (AOH), dimethylamine (DME) and triethanolamine (TEA) as precipitants were used to prepare Pt-SO42-/ZrO2 catalysts, and the crystalline structures, textural structures and surface acid properties of the catalyst samples were characterized and n-hexane hydroisomerization activity over the samples were investigated. DME and TEA as the precipitants would delay the crystallization process. The organic amines were difficult to remove during the washing process, leading to the rinsing times increase, which probably decreased the catalyst BET area. Super Lewis acid sites in SZ catalysts would play very important roles in catalytic hydroisomerization activity.

scholarly journals Glucose Conversion into 5-Hydroxymethylfurfural over Niobium Oxides Supported on Natural Rubber-Derived Carbon/Silica Nanocomposite

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 887
Author(s):  
Rujeeluk Khumho ◽  
Satit Yousatit ◽  
Chawalit Ngamcharussrivichai
Keyword(s):  
Natural Rubber ◽  
Lewis Acid ◽  
Value Added ◽  
Acid Sites ◽  
Superior Performance ◽  
Lewis Acidity ◽  
Lewis Acid Sites ◽  
Niobium Oxides ◽  
Silica Nanocomposite ◽  
Loading Amount

5-Hydroxymethylfurfural (HMF) is one of the most important lignocellulosic biomass-derived platform molecules for production of renewable fuel additives, liquid hydrocarbon fuels, and value-added chemicals. The present work developed niobium oxides (Nb2O5) supported on mesoporous carbon/silica nanocomposite (MCS), as novel solid base catalyst for synthesis of HMF via one-pot glucose conversion in a biphasic solvent. The MCS material was prepared via carbonization using natural rubber dispersed in hexagonal mesoporous silica (HMS) as a precursor. The Nb2O5 supported on MCS (Nb/MCS) catalyst with an niobium (Nb) loading amount of 10 wt.% (10-Nb/MCS) was characterized by high dispersion, and so tiny crystallites of Nb2O5, on the MCS surface, good textural properties, and the presence of Bronsted and Lewis acid sites with weak-to-medium strength. By varying the Nb loading amount, the crystallite size of Nb2O5 and molar ratio of Bronsted/Lewis acidity could be tuned. When compared to the pure silica HMS-supported Nb catalyst, the Nb/MCS material showed a superior glucose conversion and HMF yield. The highest HMF yield of 57.5% was achieved at 93.2% glucose conversion when using 10-Nb/MCS as catalyst (5 wt.% loading with respect to the mass of glucose) at 190 °C for 1 h. Furthermore, 10-Nb/MCS had excellent catalytic stability, being reused in the reaction for five consecutive cycles during which both the glucose conversion and HMF yield were insignificantly changed. Its superior performance was ascribed to the suitable ratio of Brønsted/Lewis acid sites, and the hydrophobic properties generated from the carbon moieties dispersed in the MCS nanocomposite.

On the nature of framework Brønsted and Lewis acid sites in ZSM-5

Zeolites ◽  
1997 ◽  
Vol 19 (4) ◽  
pp. 288-296 ◽  
Author(s):  
G.L. Woolery ◽  
G.H. Kuehl ◽  
H.C. Timken ◽  
A.W. Chester ◽  
J.C. Vartuli
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Brønsted And Lewis Acid

Ethylene polymerization on lewis acid sites of a reduced V2O5/Al2O3 catalyst

1992 ◽  
Vol 46 (1) ◽  
pp. 199-207 ◽  
Author(s):  
S. Ishida ◽  
S. Imamura ◽  
F. Ren ◽  
Y. Tatematsu ◽  
Y. Fujimura
Keyword(s):  
Lewis Acid ◽  
Ethylene Polymerization ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Al2o3 Catalyst
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