Cesium-Induced Active Sites for C–C Coupling and Ethanol Synthesis from CO2 Hydrogenation on Cu/ZnO(0001̅) Surfaces

2021 ◽  
Author(s):  
Xuelong Wang ◽  
Pedro J. Ramírez ◽  
Wenjie Liao ◽  
José A. Rodriguez ◽  
Ping Liu
Keyword(s):  
Active Sites ◽  
Co2 Hydrogenation ◽  
Ethanol Synthesis

scholarly journals Synergistic Effect of Alkali Na and K Promoter on Fe-Co-Cu-Al Catalysts for CO2 Hydrogenation to Light Hydrocarbons

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 735
Author(s):  
Yuhao Zheng ◽  
Chenghua Xu ◽  
Xia Zhang ◽  
Qiong Wu ◽  
Jie Liu
Keyword(s):  
Synergistic Effect ◽  
Active Sites ◽  
Intermediate Formation ◽  
Active Phase ◽  
Dissociative Adsorption ◽  
Co2 Hydrogenation ◽  
Chain Growth ◽  
Co2 Conversion ◽  
Light Hydrocarbons ◽  
Active Centers

Alkali metal K- and/or Na-promoted FeCoCuAl catalysts were synthesized by precipitation and impregnation, and their physicochemical and catalytic performance for CO2 hydrogenation to light hydrocarbons was also investigated in the present work. The results indicate that Na and/or K introduction leads to the formation of active phase metallic Fe and Fe-Co crystals in the order Na < K < K-Na. The simultaneous introduction of Na and K causes a synergistic effect on increasing the basicity and electron-rich property, promoting the formation of active sites Fe@Cu and Fe-Co@Cu with Cu0 as a crystal core. These effects are advantageous to H2 dissociative adsorption and CO2 activation, giving a high CO2 conversion with hydrogenation. Moreover, electron-rich Fe@Cu (110) and Fe-Co@Cu (200) provide active centers for further H2 dissociative adsorption and O-C-Fe intermediate formation after adsorption of CO produced by RWGS. It is beneficial for carbon chain growth in C2+ hydrocarbons, including olefins and alkanes. FeCoCuAl simultaneously modified by K-Na exhibits the highest CO2 conversion and C2+ selectivity of 52.87 mol% and 89.70 mol%, respectively.

scholarly journals Highly Selective Au/ZnO via Colloidal Deposition for CO2 Hydrogenation to Methanol: Evidence of AuZn Role

2021 ◽  
Vol 16 (1) ◽  
pp. 44-51
Author(s):  
Hasliza Bahruji ◽  
Mshaal Almalki ◽  
Norli Abdullah
Keyword(s):  
Active Sites ◽  
Au Nanoparticles ◽  
High Selectivity ◽  
Average Diameter ◽  
Co2 Hydrogenation ◽  
Impregnation Method ◽  
Co2 Conversion ◽  
Methanol Production ◽  
Surface Oxygen Vacancy ◽  
Colloidal Method

Gold, Au nanoparticles were deposited on ZnO, Al2O3, and Ga2O3 via colloidal method in order to investigate the role of support for CO2 hydrogenation to methanol. Au/ZnO was also produced using impregnation method to investigate the effect of colloidal method to improve methanol selectivity. Au/ZnO produced via sol immobilization showed high selectivity towards methanol meanwhile impregnation method produced Au/ZnO catalyst with high selectivity towards CO. The CO2 conversion was also influenced by the amount of Au weight loading. Au nanoparticles with average diameter of 3.5 nm exhibited 4% of CO2 conversion with 72% of methanol selectivity at 250 °C and 20 bar. The formation of AuZn alloy was identified as active sites for selective CO2 hydrogenation to methanol. Segregation of Zn from ZnO to form AuZn alloy increased the number of surface oxygen vacancy for CO2 adsorption to form formate intermediates. The formate was stabilized on AuZn alloy for further hydrogenation to form methanol.  The use of Al2O3 and Ga2O3 inhibited the formation of Au alloy, and therefore reduced methanol production. Au/Al2O3 showed 77% selectivity to methane, meanwhile Au/Ga2O3 produced 100% selectivity towards CO. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Photochemical Preparation of Anatase Titania Supported Gold Catalyst for Ethanol Synthesis from CO2 Hydrogenation

2017 ◽  
Vol 148 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Dong Wang ◽  
Qingyuan Bi ◽  
Guoheng Yin ◽  
Peng Wang ◽  
Fuqiang Huang ◽  
...  
Keyword(s):  
Gold Catalyst ◽  
Co2 Hydrogenation ◽  
Anatase Titania ◽  
Supported Gold ◽  
Ethanol Synthesis

Catalytic consequences of Ga promotion on Cu for CO2 hydrogenation to methanol

2017 ◽  
Vol 7 (15) ◽  
pp. 3375-3387 ◽  
Author(s):  
Juan C. Medina ◽  
Manuel Figueroa ◽  
Raydel Manrique ◽  
Jhonatan Rodríguez Pereira ◽  
Priya D. Srinivasan ◽  
...  
Keyword(s):  
Active Sites ◽  
Co2 Hydrogenation

The addition of Ga to Cu/SiO2 generates new active sites increasing selectivity to methanol. The mechanistic implications are studied by in situ DRIFTS and kinetic experiments.

Synergy between active sites of Cu-In-Zr-O catalyst in CO2 hydrogenation to methanol

2019 ◽  
Vol 372 ◽  
pp. 74-85 ◽  
Author(s):  
Libo Yao ◽  
Xiaochen Shen ◽  
Yanbo Pan ◽  
Zhenmeng Peng
Keyword(s):  
Active Sites ◽  
Co2 Hydrogenation

Grain boundaries modulating active sites in RhCo porous nanospheres for efficient CO2 hydrogenation

Nano Research ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 2357-2365 ◽  
Author(s):  
Xusheng Zheng ◽  
Yue Lin ◽  
Haibin Pan ◽  
Lihui Wu ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Active Sites ◽  
Co2 Hydrogenation

Dependence of copper particles size and interface on the methanol and CO formation in CO2 hydrogenation over Cu@ZnO catalysts

2021 ◽  
Author(s):  
Feng Jiang ◽  
Yu Yang ◽  
Li Wang ◽  
Yufeng Li ◽  
Zhihao Fang ◽  
...  
Keyword(s):  
Methanol Synthesis ◽  
Active Sites ◽  
Co2 Hydrogenation ◽  
Copper Particles

Although Cu-based catalysts have been intensively investigated on methanol synthesis from CO2 hydrogenation, there still exists debate on the active sites for methanol and CO formation. In this work, the...

scholarly journals CO2 Hydrogenation to Methanol over Ce and Zr Containing UiO-66 and Cu/UiO-66

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 39 ◽  
Author(s):  
Michalina Stawowy ◽  
Radosław Ciesielski ◽  
Tomasz Maniecki ◽  
Krzysztof Matus ◽  
Rafał Łużny ◽  
...  
Keyword(s):  
Active Sites ◽  
Fossil Fuels ◽  
Co2 Hydrogenation ◽  
Structure Stability ◽  
New Class ◽  
Developed Surface ◽  
Metal Organic ◽  
Direct Hydrogenation ◽  
The Impact ◽  
First Time

Direct hydrogenation of CO2 to methanol is an interesting method to recycle CO2 emitted e.g., during combustion of fossil fuels. However, it is a challenging process because both the selectivity to methanol and its production are low. The metal-organic frameworks are relatively new class of materials with a potential to be used as catalysts or catalysts supports, also in the reaction of MeOH production. Among many interesting structures, the UiO-66 draws significant attention owing to its chemical and thermal stability, developed surface area, and the possibility of tuning its properties e.g., by exchanging the zirconium in the nodes to other metal cations. In this work we discuss—for the first time—the performance of Cu supported on UiO-66(Ce/Zr) in CO2 hydrogenation to MeOH. We show the impact of the composition of UiO-66-based catalysts, and the character of Cu-Zr and Cu-Ce interactions on MeOH production and MeOH selectivity during test carried out for 25 h at T = 200 °C and p = 1.8 MPa. Significant increase of selectivity to MeOH was noticed after exchanging half of Zr4+ cations with Ce4+; however, no change in MeOH production occurred. It was found that the Cu-Ce coexistence in the UiO-66-based catalytic system reduced the selectivity to MeOH when compared to Cu/UiO-66(Zr), which was ascribed to lower concentration of Cu0 active sites in Cu/UiO-66(Ce/Zr), and this was caused by oxygen spill-over between Cu0 and Ce4+, and thus, the oxidation of the former. The impact of reaction conditions on the structure stability of tested catalyst was also determined.

Ru nanoparticle functionalized silica nanotubes as a catalyst for CO2 hydrogenation reaction

2021 ◽  
Vol 18 ◽  
Author(s):  
Vivek Srivastava
Keyword(s):  
Active Sites ◽  
Heterogeneous Catalysts ◽  
Chemical Properties ◽  
Hydrogenation Reaction ◽  
Active Species ◽  
Co2 Hydrogenation ◽  
Functionalized Silica ◽  
Tem Analysis ◽  
Silica Nanotubes ◽  
Ru Catalyst

: The catalytic display of supported heterogeneous catalysts is essentially reliant on their constitutive elements including active species and supports. Accordingly, the scheme and development of active catalysts with synergistically enhanced outcomes between active sites and supports are of high importance. A simple NaBH4 reduction method was used to synthesize cylindrical amine-functionalized silica nanotubes supported Ru catalyst (ASNT@Ru catalyst) including amine functionality. The physicochemical properties of the material were analyzed by various analytical methods such as SEM-TEM analysis, N2 physisorption, ICP-OES, XPS, etc, and all the data were found in good agreement with each other. Amine-free SNT support using the calcination process was also synthesized to examine the effect of amine in ASNT support on the uniform Ru dispersion. Taking the advantages of the fundamental physical and chemical properties of ASNT support and well-distributed Ru NPs, the ASNT@Ru catalyst was utilized for CO2 hydrogenation reaction and gave excellent catalytic activity/ stability in terms of a good quantity of the formic. 5 times catalysts recycling were recorded, and formic acid was obtained in good quantity.

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