scholarly journals 1,3-butadiene and methacrylonitrile obtaining using oxidative conversion of C4 olefins over Fe-Te-Mo-Ox catalyst promoted with BaCl2

2007 ◽  
Vol 1 (1) ◽  
pp. 31-34
Author(s):  
Volodymyr Gumenetskiy ◽  
◽  
Svitlana Maikova ◽  
Vyacheslav Zhyznevskiy ◽  
◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Optimal Composition ◽  
Oxidative Conversion ◽  
Process Kinetics ◽  
Oxidative Dehydration

The effect of BaCl2 promotor on the catalytic properties of Fe-Te-Mo-Ox catalyst of joint oxidative dehydration and oxidative amonolysis of C4 olefins has been examined. The optimal composition of promoted catalyst has been established taking into consideration methacrylonitrile and butadiene yields. The process kinetics has been investigated

scholarly journals A Putative Lignin Copper Oxidase from Trichoderma reesei

2021 ◽  
Vol 7 (8) ◽  
pp. 643
Author(s):  
Mariane Daou ◽  
Alexandra Bisotto ◽  
Mireille Haon ◽  
Lydie Oliveira Correia ◽  
Betty Cottyn ◽  
...  
Keyword(s):  
Trichoderma Reesei ◽  
Catalytic Properties ◽  
Oxidative Conversion ◽  
Alcohol Group ◽  
Phylogenetic Characterization ◽  
Synergistic Mechanism ◽  
Simple Carbohydrates ◽  
Soda Lignin ◽  
Copper Oxidase ◽  
Soluble Lignin

The ability of Trichoderma reesei, a fungus widely used for the commercial production of hemicellulases and cellulases, to grow and modify technical soda lignin was investigated. By quantifying fungal genomic DNA, T. reesei showed growth and sporulation in solid and liquid cultures containing lignin alone. The analysis of released soluble lignin and residual insoluble lignin was indicative of enzymatic oxidative conversion of phenolic lignin side chains and the modification of lignin structure by cleaving the β-O-4 linkages. The results also showed that polymerization reactions were taking place. A proteomic analysis conducted to investigate secreted proteins at days 3, 7, and 14 of growth revealed the presence of five auxiliary activity (AA) enzymes in the secretome: AA6, AA9, two AA3 enzymes), and the only copper radical oxidase encoded in the genome of T. reesei. This enzyme was heterologously produced and characterized, and its activity on lignin-derived molecules was investigated. Phylogenetic characterization demonstrated that this enzyme belonged to the AA5_1 family, which includes characterized glyoxal oxidases. However, the enzyme displayed overlapping physicochemical and catalytic properties across the AA5 family. The enzyme was remarkably stable at high pH and oxidized both, alcohols and aldehydes with preference to the alcohol group. It was also active on lignin-derived phenolic molecules as well as simple carbohydrates. HPSEC and LC-MS analyses on the reactions of the produced protein on lignin dimers (SS ββ, SS βO4 and GG β5) uncovered the polymerizing activity of this enzyme, which was accordingly named lignin copper oxidase (TrLOx). Polymers of up 10 units were formed by hydroxy group oxidation and radical formation. The activations of lignin molecules by TrLOx along with the co-secretion of this enzyme with reductases and FAD flavoproteins oxidoreductases during growth on lignin suggest a synergistic mechanism for lignin breakdown.

Effect of SiO2 on the physicochemical and catalytic properties of VMoTeNbО catalyst in oxidative conversion of ethane

2016 ◽  
Vol 89 (8) ◽  
pp. 1279-1285 ◽  
Author(s):  
V. M. Bondareva ◽  
E. V. Ishchenko ◽  
T. Yu. Kardash ◽  
A. V. Ishchenko ◽  
V. I. Sobolev
Keyword(s):  
Catalytic Properties ◽  
Oxidative Conversion

Catalytic properties of variable-valence metal oxides in the oxidative dehydration of ethylbenzene

1987 ◽  
Vol 36 (5) ◽  
pp. 901-904 ◽  
Author(s):  
I. P. Belomestnykh ◽  
G. V. Shakhnovich ◽  
N. N. Rozhdestvenskaya ◽  
G. V. Isagulyants
Keyword(s):  
Metal Oxides ◽  
Catalytic Properties ◽  
Variable Valence ◽  
Oxidative Dehydration

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

Electron distribution change of small nickel particles encaged in X zeolite in presence of Ce3+ ions, related to their catalytic properties

1986 ◽  
Vol 83 ◽  
pp. 619-621 ◽  
Author(s):  
F. Vergand ◽  
B. Iraqi ◽  
C. Bonnelle ◽  
E. Ramaroson ◽  
M.F. Guilleux ◽  
...  
Keyword(s):  
Electron Distribution ◽  
Catalytic Properties ◽  
Distribution Change ◽  
Nickel Particles ◽  
X Zeolite
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