scholarly journals Recent Development of Renewable Diesel Production Using Bimetallic Catalysts

2021 ◽  
Vol 9 ◽  
Author(s):  
Shir Reen Chia ◽  
Saifuddin Nomanbhay ◽  
Mei Yin Ong ◽  
Kit Wayne Chew ◽  
Kuan Shiong Khoo ◽  
...  
Keyword(s):  
Energy Source ◽  
Bimetallic Catalysts ◽  
Catalytic Properties ◽  
Renewable Diesel ◽  
Practical Solution ◽  
Catalytic Activities ◽  
Monometallic Catalysts ◽  
Synergistic Interactions ◽  
End Products ◽  
Diesel Production

Renewable diesel as a potential sustainable energy source in future requires catalysts to convert the feedstocks into end products. Among various type of catalysts, bimetallic catalysts are widely applied in the renewable diesel production due to their unique catalytic properties and enhanced catalytic activities, which differ from their parent monometallic catalysts. This mini review comprised of the brief introduction on technologies in producing renewable diesel and aims to discuss the underneath knowledge of synergistic interactions in bimetallic catalysts that synthesized through various techniques. The novelty of this review reveals the recent development of renewable diesel production, highlighting the mechanisms of bimetallic catalysts in the enhancement of the catalytic activity, and exploring their possibilities as practical solution in industrial production.

FEATURES AND CATALYTIC PROPERTIES OF RhCu: A REVIEW

2010 ◽  
Vol 24 (25n26) ◽  
pp. 5128-5138 ◽  
Author(s):  
SILVIA GONZALEZ ◽  
CARMEN SOUSA ◽  
FRANCESC ILLAS
Keyword(s):  
Catalytic Activity ◽  
Bimetallic Catalysts ◽  
Catalytic Properties ◽  
Catalytic Activities ◽  
Cu Content ◽  
Bimetallic System

The study of bimetallic catalysts has scientific and technologic importance because of special catalytic activity towards several reactions. RhCu is an interesting bimetallic system due to combination of the very different catalytic activities of Rh and Cu. The catalytic activity of this bimetallic does not result from simple interpolation of the constituents. In fact, at low Cu content, the catalytic activity of RhCu is superior to that of Rh but when the Cu content is higher the activity decays. This is a curious trend which theoretical works had attempted to explain. This paper reports an overview of the most recent research works about this bimetallic system with emphasis in its especial characteristics.

scholarly journals Tuning Catalytic Properties of Supported Bimetallic Pd/Ir Systems in the Hydrogenation of Cinnamaldehyde by Using the “Water-in-Oil” Microemulsion Method

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Tomasz Szumełda ◽  
Alicja Drelinkiewicz ◽  
Francesco Mauriello ◽  
Maria Grazia Musolino ◽  
Anna Dziedzicka ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Bimetallic Catalysts ◽  
Surface Composition ◽  
Catalytic Properties ◽  
Microemulsion Method ◽  
Monometallic Catalysts ◽  
Preparation Conditions ◽  
Supported Pd

Supported Pd/Ir bimetallic catalysts were synthesized by the “water-in-oil” microemulsion method at different precursor concentrations and characterized by XRD, XPS, SEM, TEM, and cyclic voltammetry. Depending on the preparation conditions, formation of bimetallic catalysts with different metal segregation and surface composition can be easily obtained, thus tuning the bimetallic structure of catalysts as well as their relative catalytic properties. Bimetallic Pd/Ir systems were efficiently tested in the hydrogenation of cinnamaldehyde showing a better performance than analogous monometallic catalysts.

scholarly journals Spherical Silica Modified with Magnesium and Ruthenium—Synthesis, Characterization and Catalytic Properties

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7378
Author(s):  
Kalina Grzelak ◽  
Maciej Trejda
Keyword(s):  
Bimetallic Catalysts ◽  
Levulinic Acid ◽  
Catalytic Properties ◽  
Porous Silica ◽  
N2 Adsorption ◽  
Catalytic Activities ◽  
Spherical Silica ◽  
Cascade Processes ◽  
Adsorption Desorption ◽  
Positive Effect

The design of different bimetallic catalysts is an important area of catalytic research in the context of their possible applications in the cascade processes, meeting the requirements of the so-called green chemistry. In this study, such catalysts were obtained by the incorporation of magnesium species into spherical silica, which was in the next step covered with porous silica and modified with ruthenium species. The structure and chemical composition of the materials obtained were determined by XRD measurements, low temperature N2 adsorption/desorption, SEM, ICP-OES and XPS methods. The catalytic activities of materials obtained were tested in 2-propanol decomposition and hydrogenation of levulinic acid. The results obtained confirmed the successful coverage of nanospheres with porous silica. A much higher concentration of ruthenium species was found on the surface of the catalysts than in their bulk. The opposite relationship was observed for magnesium species. The modification of nanospheres with silica had a positive effect on the catalytic activity of the materials obtained. For the most active sample, i.e., Ru/NS/3Mg/NS, 49% of levulinic acid conversion in its hydrogenation process was reported with γ-valerolactone as the only product.

scholarly journals Catalytic Diversity of GH30 Xylanases

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4528
Author(s):  
Katarína Šuchová ◽  
Vladimír Puchart ◽  
Nikolaj Spodsberg ◽  
Kristian B. R. Mørkeberg Krogh ◽  
Peter Biely
Keyword(s):  
Methyl Ester ◽  
Catalytic Properties ◽  
Specific Activity ◽  
Current Knowledge ◽  
Carboxyl Group ◽  
Weak Effect ◽  
Bacterial Enzymes ◽  
Catalytic Activities ◽  
Almost All ◽  
Free Carboxyl

Catalytic properties of GH30 xylanases belonging to subfamilies 7 and 8 were compared on glucuronoxylan, modified glucuronoxylans, arabinoxylan, rhodymenan, and xylotetraose. Most of the tested bacterial GH30-8 enzymes are specific glucuronoxylanases (EC 3.2.1.136) requiring for action the presence of free carboxyl group of MeGlcA side residues. These enzymes were not active on arabinoxylan, rhodymenan and xylotetraose, and conversion of MeGlcA to its methyl ester or its reduction to MeGlc led to a remarkable drop in their specific activity. However, some GH30-8 members are nonspecific xylanases effectively hydrolyzing all tested substrates. In terms of catalytic activities, the GH30-7 subfamily is much more diverse. In addition to specific glucuronoxylanases, the GH30-7 subfamily contains nonspecific endoxylanases and predominantly exo-acting enzymes. The activity of GH30-7 specific glucuronoxylanases also depend on the presence of the MeGlcA carboxyl, but not so strictly as in bacterial enzymes. The modification of the carboxyl group of glucuronoxylan had only weak effect on the action of predominantly exo-acting enzymes, as well as nonspecific xylanases. Rhodymenan and xylotetraose were the best substrates for exo-acting enzymes, while arabinoxylan represented hardly degradable substrate for almost all tested GH30-7 enzymes. The results expand current knowledge on the catalytic properties of this relatively novel group of xylanases.

Influence of the thermal treatment conditions and composition of bimetallic catalysts Fe—Pd/SiO2 on the catalytic properties in phenylacetylene hydrogenation

2016 ◽  
Vol 65 (2) ◽  
pp. 432-439 ◽  
Author(s):  
A. A. Shesterkina ◽  
L. M. Kozlova ◽  
O. A. Kirichenko ◽  
G. I. Kapustin ◽  
I. V. Mishin ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Bimetallic Catalysts ◽  
Catalytic Properties ◽  
Treatment Conditions

scholarly journals Integrated diesel production from lignocellulosic sugarsviaoleaginous yeast

2018 ◽  
Vol 20 (18) ◽  
pp. 4349-4365 ◽  
Author(s):  
Violeta Sànchez i Nogué ◽  
Brenna A. Black ◽  
Jacob S. Kruger ◽  
Christine A. Singer ◽  
Kelsey J. Ramirez ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Renewable Diesel ◽  
High Lipid ◽  
Diesel Production

Oleaginous microbes are promising platform strains for the production of renewable diesel and fatty-acid derived chemicals given their capacity to produce high lipid yields.

Pyrazine dicarboxylate-bridged arsenotungstate: synthesis, characterization, and catalytic activities in epoxidation of olefins and oxidation of alcohols

2019 ◽  
Vol 48 (34) ◽  
pp. 12956-12963 ◽  
Author(s):  
Xinyi Ma ◽  
Peipei He ◽  
Baijie Xu ◽  
Jingkun Lu ◽  
Rong Wan ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Catalytic Activities ◽  
Oxidation Of Alcohols ◽  
Epoxidation Of Olefins

The catalytic properties and polyanionic structure of pyrazine dicarboxylate-bridged arsenotungstate are reported.

scholarly journals Novel class of glutathione transferases from cyanobacteria exhibit high catalytic activities towards naturally occurring isothiocyanates

2007 ◽  
Vol 406 (1) ◽  
pp. 115-123 ◽  
Author(s):  
Eric Wiktelius ◽  
Gun Stenberg
Keyword(s):  
Catalytic Properties ◽  
Structural Features ◽  
Glutathione Transferases ◽  
Substrate Specificities ◽  
Catalytic Activities ◽  
Genome Databases ◽  
Naturally Occurring ◽  
Physiological Relevance ◽  
Associated Proteins

In the present paper, we report a novel class of GSTs (glutathione transferases), called the Chi class, originating from cyanobacteria and with properties not observed previously in prokaryotic enzymes. GSTs constitute a widespread multifunctional group of proteins, of which mammalian enzymes are the best characterized. Although GSTs have their origin in prokaryotes, few bacterial representatives have been characterized in detail, and the catalytic activities and substrate specificities observed have generally been very modest. The few well-studied bacterial GSTs have largely unknown physiological functions. Genome databases reveal that cyanobacteria have an extensive arsenal of glutathione-associated proteins. We have studied two cyanobacterial GSTs which are the first examples of bacterial enzymes that are as catalytically efficient as the best mammalian enzymes. GSTs from the thermophile Thermosynechococcus elongatus BP-1 and from Synechococcus elongatus PCC 6301 were found to catalyse the conjugation of naturally occurring plant-derived isothiocyanates to glutathione at high rates. The cyanobacterial GSTs studied are smaller than previously described members of this enzyme family, but display many of the typical structural features that are characteristics of GSTs. They are also active towards several classical substrates, but at the same moderate rates that have been observed for other GSTs derived from prokaryotes. The cloning, expression and characterization of two cyanobacterial GSTs are described. The possible significance of the observed catalytic properties is discussed in the context of physiological relevance and GST evolution.

Controllable synthesis of Ni nanotube arrays and their structure-dependent catalytic activity toward dye degradation

CrystEngComm ◽  
2014 ◽  
Vol 16 (21) ◽  
pp. 4406-4413 ◽  
Author(s):  
Xiang-Zi Li ◽  
Kong-Lin Wu ◽  
Yin Ye ◽  
Xian-Wen Wei
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Dye Degradation ◽  
Nanotube Arrays ◽  
Nanorod Arrays ◽  
Growth Mechanisms ◽  
Controllable Synthesis ◽  
Catalytic Activities ◽  
One Step ◽  
The Relationship

Ni nanotube (nanorod) arrays are controllably fabricated by a one-step approach, the GDDATG and DDCG growth mechanisms are introduced. The Ni nanostructures present higher catalytic activities for dye degradation, the relationship between structures and catalytic properties is also studied.

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