Effect of ultra-low amount of gold in oxide-supported bimetallic Au-Fe and Au-Cu catalysts on liquid-phase aerobic glycerol oxidation in water

2021 ◽  
Author(s):  
Elena Redina ◽  
Gennady Kapustin ◽  
Olga Petrovna Tkachenko ◽  
Alexander Avraamovich Greish ◽  
Leonid Kustov
Keyword(s):  
Liquid Phase ◽  
High Activity ◽  
Bimetallic Catalysts ◽  
Glycerol Oxidation ◽  
Catalytic Systems ◽  
Cu Catalysts

Low-loaded Au-Fe and Au-Cu bimetallic catalysts with an Au content of 0.025-0.5% wt supported on TiO2 and CeO2 were prepared. The obtained catalytic systems revealed a unique high activity in...

scholarly journals Selective Hydrogenation Properties of Ni-Based Bimetallic Catalysts

Eng ◽  
2022 ◽  
Vol 3 (1) ◽  
pp. 60-77
Author(s):  
Nobutaka Yamanaka ◽  
Shogo Shimazu
Keyword(s):  
High Activity ◽  
Selective Hydrogenation ◽  
Electronic Structures ◽  
Bimetallic Catalysts ◽  
Bimetallic Nanoparticles ◽  
Ni Catalyst ◽  
Electronic Effects ◽  
Catalytic Systems ◽  
Chemoselective Hydrogenation ◽  
Hydrogenation Reactions

Metallic Ni shows high activity for a variety of hydrogenation reactions due to its intrinsically high capability for H2 activation, but it suffers from low chemoselectivity for target products when two or more reactive functional groups are present on one molecule. Modification by other metals changes the geometric and electronic structures of the monometallic Ni catalyst, providing an opportunity to design Ni-based bimetallic catalysts with improved activity, chemoselectivity, and durability. In this review, the hydrogenation properties of these catalysts are described starting from the typical methods of preparing Ni-based bimetallic nanoparticles. In most cases, the reasons for the enhanced catalysis are discussed based on the geometric and electronic effects. This review provides new insights into the development of more efficient and well-structured non-noble metal-based bimetallic catalytic systems for chemoselective hydrogenation reactions.

Preparation of Core-Shell Silica - 12-Tungstophosphoricacid Nanoparticles for Acylation of Aromatics

2013 ◽  
Vol 706-708 ◽  
pp. 219-223
Author(s):  
Hsiu Ling Hsu ◽  
Rosilda Selvin ◽  
L. Selva Roselin
Keyword(s):  
Liquid Phase ◽  
High Activity ◽  
Solid Acid ◽  
Coke Formation ◽  
Solid Acid Catalysts ◽  
Core Shell ◽  
Acid Catalysts ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles ◽  
Enhanced Selectivity

A variety of solid acid catalysts especially 12-Tungstophosphoricacid (DTP) supported on silica has been reported for the acylation of anisole, veratrole and toluene. However, the activity of this catalyst is susceptible to coke formation or poor activity. This paper reports the novelties of steam treated SiO2-DTP core-shell nanoparticles, which exhibits tremendous stability, high activity and enhanced selectivity in the liquid-phase acylation of anisole, veratrole and toluene as compared to conventional DTP supported on silica.

scholarly journals Synthesis of higher alcohols from CO 2 hydrogenation over a PtRu/Fe 2 O 3 catalyst under supercritical condition

2015 ◽  
Vol 373 (2057) ◽  
pp. 20150006 ◽  
Author(s):  
Zhenhong He ◽  
Qingli Qian ◽  
Zhaofu Zhang ◽  
Qinglei Meng ◽  
Huacong Zhou ◽  
...  
Keyword(s):  
High Activity ◽  
Bimetallic Catalysts ◽  
Supercritical Condition ◽  
Molar Ratio ◽  
Higher Alcohols ◽  
Obvious Change ◽  
Heterogeneous Hydrogenation ◽  
Hydrogenation Of Co

Hydrogenation of CO 2 to alcohols is of great importance, especially when producing higher alcohols. In this work, we synthesized heterogeneous PtRu/Fe 2 O 3 , in which the Pt and Ru bimetallic catalysts were supported on Fe 2 O 3 . The catalyst was used to catalyse CO 2 hydrogenation to alcohols. It was demonstrated that the activity and selectivity could be tuned by the bimetallic composition, and the catalyst with a Pt to Ru molar ratio of 1:2 (Pt 1 Ru 2 /Fe 2 O 3 ) had high activity and selectivity at 200°C, which is very low for heterogeneous hydrogenation of CO 2 to produce higher alcohols. The conversion and the selectivity increased with increasing pressures of CO 2 and/or H 2 . The catalyst could be reused at least five times without any obvious change in activity or selectivity.

Cost-effective promoter-doped Cu-based bimetallic catalysts for the selective hydrogenation of C2H2 to C2H4: the effect of the promoter on selectivity and activity

2018 ◽  
Vol 20 (25) ◽  
pp. 17487-17496 ◽  
Author(s):  
Riguang Zhang ◽  
Bo Zhao ◽  
Leilei He ◽  
Anjie Wang ◽  
Baojun Wang
Keyword(s):  
Density Functional Theory ◽  
Selective Hydrogenation ◽  
Bimetallic Catalysts ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Cost Effective ◽  
Microkinetic Modeling ◽  
Functional Theory ◽  
Cu Catalysts

Different metal promoter M-modified Cu catalysts have been employed to fully investigate the selective hydrogenation of C2H2 using density functional theory calculations together with microkinetic modeling.

scholarly journals Bimetallic Pd-Au/SiO2 Catalysts for Reduction of Furfural in Water

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 444 ◽  
Author(s):  
Magdalena Modelska ◽  
Michal J. Binczarski ◽  
Zbigniew Kaminski ◽  
Stanislaw Karski ◽  
Beata Kolesinska ◽  
...  
Keyword(s):  
Solid Solution ◽  
Reaction Mechanism ◽  
High Activity ◽  
Main Product ◽  
Waste Biomass ◽  
Catalytic Systems ◽  
Tof Sims ◽  
Spent Grain ◽  
Brewery's Spent Grain ◽  
Hydrolysis Of

Catalytic systems based on bimetallic Pd-Au particles deposited on SiO2 were prepared by ultrasonically assisted water impregnation and used in the hydrogenation of furfural obtained by the acidic hydrolysis of waste biomass (brewery’s spent grain) in aqueous phase. Pd-Au/SiO2 catalysts containing 50 g of Pd and 2–100 g of Au per 1 kg of catalyst were characterized by high activity in the studied process and, depending on the Pd/Au ratio, selectivity to 2-methyloxolan-2-ol. The modification of 5%Pd/SiO2 by Au leads to the formation of dispersed Au-Pd solid solution phases, which was confirmed by XRD, XPS, ToF-SIMS, SEM-EDS, and H2-TPR techniques. The effect of dilution of surface palladium by gold atoms is probably crucial for modification of the reaction mechanism and formation of 2-methyloxolan-2-ol as the main product.

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