Ultrasmall Ni nanoparticles embedded in Zr-based MOFs provide high selectivity for CO2 hydrogenation to methane at low temperatures

2018 ◽  
Vol 8 (12) ◽  
pp. 3160-3165 ◽  
Author(s):  
Zhi-Wei Zhao ◽  
Xiao Zhou ◽  
Ya-Nan Liu ◽  
Cong-Cong Shen ◽  
Cheng-Zong Yuan ◽  
...  
Keyword(s):  
Low Temperatures ◽  
High Selectivity ◽  
Co2 Hydrogenation ◽  
Ni Nanoparticles ◽  
Excellent Activity

Highly monodisperse Ni NPs in UiO-66 give both excellent activity and selectivity for CO2 methanation at low temperatures.

scholarly journals Hydrogenation of CO2 Promoted by Silicon-Activated H2S: Origin and Implications

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 50
Author(s):  
Xing Liu
Keyword(s):  
Low Temperatures ◽  
Underlying Mechanism ◽  
Reactive Species ◽  
Co2 Hydrogenation ◽  
Usual Method ◽  
Title Reaction ◽  
Hydrogenation Of Co2 ◽  
Hydrogenation Reactions

Unlike the usual method of COx (x = 1, 2) hydrogenation using H2 directly, H2S and HSiSH (silicon-activated H2S) were selected as alternative hydrogen sources in this study for the COx hydrogenation reactions. Our results suggest that it is kinetically infeasible for hydrogen in the form of H2S to transfer to COx at low temperatures. However, when HSiSH is employed instead, the title reaction can be achieved. For this approach, the activation of CO2 is initiated by its interaction with the HSiSH molecule, a reactive species with both a hydridic Hδ− and protonic Hδ+. These active hydrogens are responsible for the successive C-end and O-end activations of CO2 and hence the final product (HCOOH). This finding represents a good example of an indirect hydrogen source used in CO2 hydrogenation through reactivity tuned by silicon incorporation, and thus the underlying mechanism will be valuable for the design of similar reactions.

Coalescence and shape oscillations of Au nanoparticles in CO2 hydrogenation for methanol reaction

Nanoscale ◽  
2021 ◽  
Author(s):  
Shengnan Yue ◽  
Yongli Shen ◽  
Ziliang Deng ◽  
Wenjuan Yuan ◽  
Wei Xi
Keyword(s):  
Au Nanoparticles ◽  
High Selectivity ◽  
Co2 Hydrogenation ◽  
Au Nanoparticle ◽  
Limited Knowledge ◽  
Shape Oscillations

Recently, there has been renewed interest in Au nanoparticle (Au NP) catalysts owing to their high selectivity for CO2 hydrogenation to methanol. However, there is still limited knowledge on the...

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). 

scholarly journals Catalytic reactivity of an iridium complex with a proton responsive N-donor ligand in CO2 hydrogenation to formate

RSC Advances ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1346-1350 ◽  
Author(s):  
Gunniya Hariyanandam Gunasekar ◽  
Yeahsel Yoon ◽  
Il-hyun Baek ◽  
Sungho Yoon
Keyword(s):  
Structural Instability ◽  
Co2 Hydrogenation ◽  
Catalytic Cycle ◽  
Iridium Complex ◽  
Donor Ligand ◽  
Excellent Activity ◽  
Catalytic Reactivity ◽  
Half Sandwich

A bibenzimidazole ligated half-sandwich Ir complex [Cp*Ir(BiBzImH2)Cl]Cl shows superior activity than that of its bipyridine counterpart. Owing to the structural instability, the initial excellent activity of [Cp*Ir(BiBzImH2)Cl]Cl was reduced when catalytic cycle proceeds.

scholarly journals High selectivity of CO2 hydrogenation to CO by controlling the valence state of nickel using perovskite

2018 ◽  
Vol 54 (53) ◽  
pp. 7354-7357 ◽  
Author(s):  
Baohuai Zhao ◽  
Binhang Yan ◽  
Zhao Jiang ◽  
Siyu Yao ◽  
Zongyuan Liu ◽  
...  
Keyword(s):  
Valence State ◽  
High Selectivity ◽  
Co2 Hydrogenation ◽  
Product Selectivity

The product selectivity of CO2 hydrogenation can be significantly tuned by controlling the valence state of Ni using perovskites.

Ni nanoparticles supported on CNTs with excellent activity produced by atomic layer deposition for hydrogen generation from the hydrolysis of ammonia borane

2016 ◽  
Vol 6 (7) ◽  
pp. 2112-2119 ◽  
Author(s):  
Jiankang Zhang ◽  
Chaoqiu Chen ◽  
Wenjun Yan ◽  
Feifei Duan ◽  
Bin Zhang ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Hydrogen Generation ◽  
Atomic Layer ◽  
Ammonia Borane ◽  
Ni Nanoparticles ◽  
Highly Efficient ◽  
Layer Deposition ◽  
Excellent Activity ◽  
Hydrolysis Of

Highly efficient Ni nanoparticles deposited on CNTs were synthesized by atomic layer deposition used for hydrogen generation from AB hydrolysis.

Induced high selectivity methanol formation during CO2 hydrogenation over a CuBr2-modified CuZnZr catalyst

2020 ◽  
Vol 389 ◽  
pp. 47-59 ◽  
Author(s):  
Shuyao Chen ◽  
Junfeng Zhang ◽  
Faen Song ◽  
Qingde Zhang ◽  
Guohui Yang ◽  
...  
Keyword(s):  
High Selectivity ◽  
Co2 Hydrogenation ◽  
Methanol Formation

Face-selective Diels–Alder reactions of (1R,5R)-3-formyl-6,6-dimethylbicyclo[3.1.1]hept-3-en-2-one

1994 ◽  
Vol 72 (9) ◽  
pp. 1883-1893 ◽  
Author(s):  
Hsing-Jang Liu ◽  
Yanhong Li ◽  
Eric N.C. Browne
Keyword(s):  
Low Temperatures ◽  
Boron Trifluoride ◽  
General Type ◽  
Acid Catalysis ◽  
High Selectivity ◽  
Boron Trifluoride Etherate ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction ◽  
Very High

The stereofacially differentiated enone aldehyde 11 was chosen to study the effects of steric and electronic influence on the Diels–Alder reaction. Under Lewis acid catalysis, 11 adds to dienes at low temperatures at a reasonable rate. Yields of desired chiral adducts are good to high with zinc chloride and boron trifluoride etherate catalysis. In all cases only products of addition to the Re face of general type 27 were observed. The regiochemistry of the adducts is exclusively that predicted by the ortho and para rules. The stereochemistry shows a very high selectivity in favour of aldehyde-endo transition state products. Unusual byproducts were also obtained in some examples and mechanisms of these unexpected reactions are discussed.

scholarly journals A NiFe Alloy Reduced on Graphene Oxide for Electrochemical Nonenzymatic Glucose Sensing

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3972 ◽  
Author(s):  
Zhe-Peng Deng ◽  
Yu Sun ◽  
Yong-Cheng Wang ◽  
Jian-De Gao
Keyword(s):  
Graphene Oxide ◽  
High Selectivity ◽  
Glucose Sensing ◽  
Glucose Detection ◽  
Ni Nanoparticles ◽  
X Ray Diffraction ◽  
Modified Glassy Carbon Electrode ◽  
X Ray ◽  
Transmission Electron ◽  
Measurement Results

A NiFe alloy nanoparticle/graphene oxide hybrid (NiFe/GO) was prepared for electrochemical glucose sensing. The as-prepared NiFe/GO hybrid was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results indicated that NiFe alloy nanoparticles can be successfully deposited on GO. The electrochemical glucose sensing performance of the as-prepared NiFe/GO hybrid was studied by cyclic voltammetry and amperometric measurement. Results showed that the NiFe/GO-modified glassy carbon electrode had sensitivity of 173 μA mM−1 cm−2 for glucose sensing with a linear range up to 5 mM, which is superior to that of commonly used Ni nanoparticles. Furthermore, high selectivity for glucose detection could be achieved by the NiFe/GO hybrid. All the results demonstrated that the NiFe/GO hybrid has promise for application in electrochemical glucose sensing.

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