Recent progress in hydrogenation of esters on heterogeneous bimetallic catalysts

2021 ◽  
Author(s):  
Anna Strekalova ◽  
Anastasiya Shesterkina ◽  
Leonid Kustov
Keyword(s):  
High Activity ◽  
Bimetallic Catalysts ◽  
Recent Progress ◽  
Monometallic Catalysts ◽  
Copper Chromium

Monometallic catalysts based on copper phyllosilicates were actively studied in the 2000s as an alternative to the copper-chromium Adkins catalyst due to their non-toxic properties and high activity in the...

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.

Enhanced Pd pillared clays by Rh inclusion for the catalytic hydrodechlorination of chlorophenols in water

2012 ◽  
Vol 65 (4) ◽  
pp. 653-660 ◽  
Author(s):  
C. B. Molina ◽  
A. H. Pizarro ◽  
J. A. Casas ◽  
J. J. Rodriguez
Keyword(s):  
Aqueous Phase ◽  
Bimetallic Catalysts ◽  
Pillared Clays ◽  
Target Compound ◽  
Catalytic Hydrodechlorination ◽  
Monometallic Catalysts ◽  
Total Metal ◽  
Metal Load

Bimetallic Pd–Rh catalysts supported on pillared clays have been prepared and tested for aqueous-phase hydrodechlorination (HDC) using 4-chlorophenol (4-CP) as target compound. These bimetallic catalysts combine the higher activity of Rh with the better stability of Pd found in previous works with monometallic catalysts. Different combinations of Pd and Rh amounting to 1 wt% total metal load were tested and the catalyst with 0.75 wt% Pd and 0.25 wt% Rh yielded the best results. Ecotoxicity and biodegradability (measured as BOD5/COD ratio) of the effluents were checked. A significant decrease of ecotoxicity was observed while biodegradability was dramatically improved from 0.02 for the initial 4-CP solution up to values higher than 0.6.

Tuning chemical compositions of bimetallic AuPd catalysts for selective catalytic hydrogenation of halogenated quinolines

2017 ◽  
Vol 5 (7) ◽  
pp. 3260-3266 ◽  
Author(s):  
Sai Zhang ◽  
Zhaoming Xia ◽  
Ting Ni ◽  
Huan Zhang ◽  
Chao Wu ◽  
...  
Keyword(s):  
High Activity ◽  
Catalytic Hydrogenation ◽  
Bimetallic Catalysts ◽  
Selective Adsorption ◽  
Chemical Compositions

Au1−xPdx bimetallic catalysts with low Pd entities on CeO2 nanorods delivered high activity and chemoselectivity for hydrogenation of halogenated quinolines. Improved chemoselectivity could be attributed to the selective adsorption configurations of halogenated quinolines on Au via tilted orientation rather than on Pd via flat orientation.

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 High activity Pd-Fe bimetallic catalysts for aqueous phase hydrogenations

2019 ◽  
Vol 477 ◽  
pp. 110546 ◽  
Author(s):  
Yan Cheng ◽  
Hien Pham ◽  
Jiajie Huo ◽  
Robert Johnson ◽  
Abhaya K. Datye ◽  
...  
Keyword(s):  
High Activity ◽  
Aqueous Phase ◽  
Bimetallic Catalysts

Activated nanostructured bimetallic catalysts for C–C coupling reactions: recent progress

2016 ◽  
Vol 6 (10) ◽  
pp. 3341-3361 ◽  
Author(s):  
Rohit Kumar Rai ◽  
Deepika Tyagi ◽  
Kavita Gupta ◽  
Sanjay Kumar Singh
Keyword(s):  
Bimetallic Catalysts ◽  
Recent Progress ◽  
Coupling Reactions ◽  
Nanoparticle Catalysts ◽  
Bimetallic Alloy ◽  
Made In

This minireview highlights the recent progress made in the last decade towards the development of activated bimetallic alloy nanoparticle catalysts for C–C coupling reactions, including asymmetric C–C bond coupling reactions.

ChemInform Abstract: Activated Nanostructured Bimetallic Catalysts for C-C Coupling Reactions: Recent Progress

ChemInform ◽  
2016 ◽  
Vol 47 (31) ◽  
Author(s):  
Rohit Kumar Rai ◽  
Deepika Tyagi ◽  
Kavita Gupta ◽  
Sanjay Kumar Singh
Keyword(s):  
Bimetallic Catalysts ◽  
Recent Progress ◽  
Coupling Reactions

scholarly journals Titanate Nanotube-Supported Au–Rh Bimetallic Catalysts: Characterization and Their Catalytic Performances in Hydroformylation of Vinyl Acetate

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 420 ◽  
Author(s):  
Ya Chen ◽  
Penghe Su ◽  
Xiaotong Liu ◽  
Hongchi Liu ◽  
Baolin Zhu ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Bimetallic Catalysts ◽  
Catalytic Performance ◽  
Supported Metal Catalysts ◽  
Turnover Frequency ◽  
Bimetallic Particles ◽  
Titanate Nanotube ◽  
Monometallic Catalysts ◽  
Reduction Processes ◽  
Catalytic Performances

A series of titanate nanotube-supported metal catalysts (M/TNTs, M = Rh, Au orAu–Rh) were facilely synthesized. The effects of different Au contents, reduction processes and sequence of loading metals on their catalytic performances in the hydroformylation of vinyl acetate were comparatively investigated. The results showed that some Au and Rh formed bimetallic particles. Furthermore, the presence of Au in catalysts could significantly improve the selectivity of reaction for aldehydes. Compared with the monometallic catalysts (Rh0.33/TNTs-1 and Au0.49/TNTs-2), the resultant bimetallic catalysts exhibited significantly higher selectivity for aldehydes as well as higher TOF values in the hydroformylation of vinyl acetate. Among them, Au0.52/Rh0.32/TNTs-12 displayed the best catalytic performance. The corresponding selectivity for aldehydes was as high as 88.67%and the turnover frequency (TOF) reached up to 3500 h−1. In addition, for the reduction of Rh3+ and Au3+ ions, the photo-reduction and ethanol-reduction were the optimal techniques under the present conditions, respectively.

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