Mechanistic insights into alkene chain growth reactions catalyzed by nickel active sites on ordered microporous and mesoporous supports

2020 ◽  
Vol 10 (21) ◽  
pp. 7101-7123
Author(s):  
Ravi Joshi ◽  
Arunima Saxena ◽  
Rajamani Gounder
Keyword(s):  
Porous Materials ◽  
Active Sites ◽  
Chain Growth ◽  
Alkene Oligomerization ◽  
Mesoporous Supports ◽  
Ordered Porous

This mini-review discusses the mechanistic details underlying the activation and deactivation behavior, and the kinetics and selectivity among alkene isomer products, observed on Ni-based ordered porous materials during light alkene oligomerization.

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 Atoms and the void: modular construction of ordered porous solids

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
James D. Wuest
Keyword(s):  
Porous Materials ◽  
Molecular Level ◽  
Porous Solids ◽  
Modular Construction ◽  
Molecular Components ◽  
New Generation ◽  
Ordered Porous

Abstract For millennia, humans have exploited the special properties of porous materials. Advances in recent years have yielded a new generation of finely structured porous materials that allow processes to be controlled at the molecular level. These materials are built by a strategy of modular construction, using molecular components designed to position their neighbors in ways that create predictable voids.

scholarly journals Ordered Porous TiO2@C Layer as an Electrocatalyst Support for Improved Stability in PEMFCs

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3462
Author(s):  
Gaoyang Liu ◽  
Zhaoyi Yang ◽  
Xindong Wang ◽  
Baizeng Fang
Keyword(s):  
Active Sites ◽  
Structural Characteristics ◽  
Clean Energy ◽  
Carbon Layer ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Durability Test ◽  
Thin Carbon ◽  
Array Structure ◽  
Ordered Porous

Proton exchange membrane fuel cells (PEMFCs) are the most promising clean energy source in the 21st century. In order to achieve a high power density, electrocatalytic performance, and electrochemical stability, an ordered array structure membrane electrode is highly desired. In this paper, a new porous Pt-TiO2@C ordered integrated electrode was prepared and applied to the cathode of a PEMFC. The utilization of the TiO2@C support can significantly decrease the loss of catalyst caused by the oxidation of the carbon from the conventional carbon layer due to the strong interaction of TiO2 and C. Furthermore, the thin carbon layer coated on TiO2 provides the rich active sites for the Pt growth, and the ordered support and catalyst structure reduces the mass transport resistance and improves the stability of the electrode. Due to its unique structural characteristics, the ordered porous Pt-TiO2@C array structure shows an excellent catalytic activity and improved Pt utilization. In addition, the as-developed porous ordered structure exhibits superior stability after 3000 cycles of accelerated durability test, which reveals an electrochemical surface area decay of less than 30%, considerably lower than that (i.e., 80%) observed for the commercial Pt/C.

scholarly journals Metal–Organic Frameworks Toward Electrocatalytic Applications

2019 ◽  
Vol 9 (12) ◽  
pp. 2427 ◽  
Author(s):  
Jun-Hong Li ◽  
Yi-Sen Wang ◽  
Yu-Chuan Chen ◽  
Chung-Wei Kung
Keyword(s):  
Thin Films ◽  
Porous Materials ◽  
Active Sites ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
High Density ◽  
Dimensional Array ◽  
Metal Organic ◽  
Porous Supports ◽  
Catalytic Applications

Metal–organic frameworks (MOFs) are a class of porous materials constructed from metal-rich inorganic nodes and organic linkers. Because of their regular porosity in microporous or mesoporous scale and periodic intra-framework functionality, three-dimensional array of high-density and well-separated active sites can be built in various MOFs; such characteristics render MOFs attractive porous supports for a range of catalytic applications. Furthermore, the electrochemically addressable thin films of such MOF materials are reasonably considered as attractive candidates for electrocatalysis and relevant applications. Although it still constitutes an emerging subfield, the use of MOFs and relevant materials for electrocatalytic applications has attracted much attention in recent years. In this review, we aim to focus on the limitations and commonly seen issues for utilizing MOFs in electrocatalysis and the strategies to overcome these challenges. The research efforts on utilizing MOFs in a range of electrocatalytic applications are also highlighted.

Rational synthesis of isomorphic rare earth metal-organic framework materials for simultaneous adsorption and photocatalytic degradation of organic dyes in water

CrystEngComm ◽  
2021 ◽  
Author(s):  
Meng-Ting Hang ◽  
Yi Cheng ◽  
Yi-Tong Wang ◽  
Huan Li ◽  
Meng-Qi Zheng ◽  
...  
Keyword(s):  
Active Sites ◽  
Organic Dyes ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Earth Metal ◽  
Dye Wastewater ◽  
Porous Structures ◽  
Framework Materials ◽  
Metal Organic ◽  
Ordered Porous

In recent years, the treatment of dye wastewater has attracted widespread attention. Metal-organic frameworks (MOFs) adopt ordered porous structures and abundant active sites, which endorses them promising photocatalysts for the...

Semi-fluorinated Surfactant Syntheses of Ordered Porous Materials with Tailorable Pore Sizes

2004 ◽  
Vol 16 (25) ◽  
pp. 5518-5526 ◽  
Author(s):  
Xiangju Meng ◽  
Yan Di ◽  
Lan Zhao ◽  
Dazhen Jiang ◽  
Shougui Li ◽  
...  
Keyword(s):  
Porous Materials ◽  
Fluorinated Surfactant ◽  
Pore Sizes ◽  
Ordered Porous

Strengthening of polymer ordered porous materials based on a layered nanocomposite internal structure

Nanoscale ◽  
2016 ◽  
Vol 8 (27) ◽  
pp. 13507-13512 ◽  
Author(s):  
Liping Heng ◽  
Xieyou Guo ◽  
Tianqi Guo ◽  
Bin Wang ◽  
Lei Jiang
Keyword(s):  
Porous Materials ◽  
Internal Structure ◽  
Ordered Porous

Introduction to the themed issue in honor of Dr François Fajula: “An exciting journey in the creative world of ordered porous materials and their applications”

2016 ◽  
Vol 40 (5) ◽  
pp. 3930-3932 ◽  
Author(s):  
Anne Galarneau ◽  
Irina I. Ivanova
Keyword(s):  
Porous Materials ◽  
Porous Solids ◽  
Ordered Porous

This themed issue, dedicated to François Fajula, includes the latest achievements in the field of ordered porous solids, which is among the most creative, fascinating and attractive fields of chemistry.

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