Modulation of Brønsted and Lewis Acid Centers for Ni x Co 3− x O 4 Spinel Catalysts: Towards Efficient Catalytic Conversion of Lignin

2022 ◽  
pp. 2111615
Author(s):  
Yi Qi ◽  
Xin Xiao ◽  
Yuqing Mei ◽  
Lingyingzi Xiong ◽  
Liheng Chen ◽  
...  
2020 ◽  
Vol 11 (12) ◽  
pp. 3345-3354 ◽  
Author(s):  
Sheng-Chun Chen ◽  
Fei-Hang Zhang ◽  
Kun-Lin Huang ◽  
Feng Tian ◽  
Zhi-Hui Zhang ◽  
...  

A new ring-opening polymerization mechanism is unveiled based on synergistic catalysis involving Brønsted and Lewis acid centers in a coordination framework.


2021 ◽  
Vol 2124 (1) ◽  
pp. 012003
Author(s):  
V I Loganina ◽  
N N Laskov ◽  
G G Boldyrev

Abstract Information on the effect of thermal activation of silicate and aluminosilicate rocks used as a filler in dry building mixtures on their reactivity of interaction with lime binder is presented. The change in the distribution of acidic Bronsted and Lewis centers on the filler surface as a result of thermal activation is shown. It was found that the number of Bronsted and Lewis acid centers on the surface of fired clays exceeds the number of the same centers on the surface of unbaked clays. The number of adsorption centers at pKa from 0 to 7 and pKa> 13 on the surface of fired diatomite is 2.435 * 10-5 mol/g, and on the surface of unbaked diatomite -1.678 * 10−5 mol/g. The heat treatment of diatomite at low temperatures (2000C and 3000C) does not significantly affect the values of the compressive strength of the mortar. An increase in the firing temperature to 7000C leads to an increase in strength characteristics up to R = 4.38 MPa. However, the greatest effect is achieved when diatomite is fired at a temperature of t = 9000C. The value of the ultimate strength in compression was R = 5.1 MPa.


1984 ◽  
Vol 49 (12) ◽  
pp. 2739-2743 ◽  
Author(s):  
Miloslav Křivánek ◽  
Pavel Jírů

The degree and heat of adsorption of 1-butylamine and ammonia were measured on samples of NaHY zeolites activated at 400-600°C. The adsorption isotherms and calorimetric curves were compared for the two bases, and the amount of Bronsted and Lewis acid centres was determined from the calorimetric curves.


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

1991 ◽  
Vol 2 (4) ◽  
pp. 675-681 ◽  
Author(s):  
E. V. Lunina ◽  
G. L. Markaryan ◽  
A. V. Fionov ◽  
A. V. Astashkin ◽  
R. I. Samoilova ◽  
...  

2020 ◽  
Vol 59 (20) ◽  
pp. 9459-9468 ◽  
Author(s):  
I. Istadi ◽  
Teguh Riyanto ◽  
Luqman Buchori ◽  
Didi Dwi Anggoro ◽  
G. Gilbert ◽  
...  

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