Functionalization of SBA-15 with CeO2 nanoparticles for adsorptive desulfurization: Matters of template P123

Adsorption is one of the most promising methods for desulfurization of transportation fuels, due to the strategy which enables removal of organic sulfur compounds to be conducted at ambient conditions with high efficiency. Adsorbent is the key to the adsorptive performance. Both π complexation and direct sulfur metal bonds are efficient methods for adsorptive desulfurization. For construction of these bonds, it is necessary to introduce active metal species on the support. In this work, Ce(NO3)2 was directly introduced into the as-synthesized SBA-15, and high dispersion of CeO2 nanoparticles was obtained. With the loading content of 12–46 wt%, the particle sizes of the CeO2 NPs are in the range of 4.4–6.3 nm. The good dispersion status of CeO2 nanoparticles is contributed to the template P123 preserved in as-synthesized SBA-15, which provides a confined space for the dispersion of CeO2 nanoparticles. However, the large CeO2 particles (7.0 nm) are formed for the sample originated from template-free SBA-15. We also demonstrate that the adsorptive performance of SBA-15 is enhanced with the modification of CeO2 nanoparticles. Besides, the performances of CeO2 nanoparticle-modified samples stay in step with the dispersion status of the CeO2 nanoparticles.

Download Full-text

Piperazine as an Inexpensive and Efficient Ligand for Pd-Catalyzed Homocoupling Reactions to Synthesize Bipyridines and Their Analogues

Current Organic Synthesis ◽

10.2174/1570179415666180913131905 ◽

2019 ◽

Vol 16 (1) ◽

pp. 173-180

Author(s):

Mingwei Chen ◽

Jinyu Hu ◽

Xiaoli Tang ◽

Qiming Zhu

Keyword(s):

Transition Metal ◽

Oxidation State ◽

Coupling Reaction ◽

Aryl Halides ◽

Metal Species ◽

Good Substrate ◽

Active Metal ◽

Homocoupling Reaction ◽

Catalytic Cycles ◽

Reductive Homocoupling

Aim and Objective: The synthesis of bipyridines, especially 2, 2’-bipyridines, remains challenging because the catalytic cycle can be inhibited due to coordination of bipyridine to transition metal. Thus, the development of efficient methods for the synthesis of bipyridines is highly desirable. In the present work, we presented a promising approach for preparation of bipyridines via a Pd-catalyzed reductive homocoupling reaction with simple piperazine as a ligand. Materials and Methods: Simple and inexpensive piperazine was used as a ligand for Pd-catalyzed homocoupling reaction. The combination of Pd(OAc)2 and piperazine in dimethylformamide (DMF) was observed to form an excellent catalyst and efficiently catalyzed the homocoupling of azaarenyl halides, in which DMF was used as the solvent without excess reductants although stoichiometric reductant was generally required to generate the low-oxidation-state active metal species in the catalytic cycles. </P><P> Results: In this case, good to excellent yields of bipyridines and their (hetero) aromatic analogues were obtained in the presence of 2.5 mol% of Pd(OAc)2 and 5 mol% of piperazine, using K3PO4 as a base in DMF at 140°C. Conclusion: According to the results, piperazine as an inexpensive and efficient ligand was used in the Pd(OAc)2-catalyzed homocoupling reaction of heteroaryl and aryl halides. The coupling reaction was operationally simple and displayed good substrate compatibility.

Download Full-text

Desulfurization of Transportation Fuels with Zeolites Under Ambient Conditions

Science ◽

10.1126/science.1085088 ◽

2003 ◽

Vol 301 (5629) ◽

pp. 79-81 ◽

Cited By ~ 657

Author(s):

R. T. Yang

Keyword(s):

Ambient Conditions ◽

Transportation Fuels

Download Full-text

Control of hydrogenation and hydrocracking activities of molybdenum sulfide catalysts supported on alumina. (Part 2). Relation between structure of active metal species and catalytic function.

Journal of The Japan Petroleum Institute ◽

10.1627/jpi1958.32.35 ◽

1989 ◽

Vol 32 (1) ◽

pp. 35-42 ◽

Cited By ~ 8

Author(s):

Akio NISHIJIMA ◽

Hiromichi SHIMADA ◽

Toshio SATO ◽

Yuji YOSHIMURA ◽

Nobuyuki MATSUBAYASHI ◽

...

Keyword(s):

Molybdenum Sulfide ◽

Metal Species ◽

Sulfide Catalysts ◽

Catalytic Function ◽

Active Metal

Download Full-text

Confining the spin between two metal atoms within the carbon cage: redox-active metal–metal bonds in dimetallofullerenes and their stable cation radicals

Nanoscale ◽

10.1039/c7nr02288c ◽

2017 ◽

Vol 9 (23) ◽

pp. 7977-7990 ◽

Cited By ~ 23

Author(s):

Nataliya A. Samoylova ◽

Stanislav M. Avdoshenko ◽

Denis S. Krylov ◽

Hannah R. Thompson ◽

Amelia C. Kirkhorn ◽

...

Keyword(s):

Carbon Cage ◽

Cation Radicals ◽

Metal Atoms ◽

Redox Active ◽

Active Metal ◽

Metal Metal ◽

Metal Metal Bonds ◽

Metal Bonds ◽

Redox Active Metal

Download Full-text

Evolution and stabilization of subnanometric metal species in confined space by in situ TEM

Nature Communications ◽

10.1038/s41467-018-03012-6 ◽

2018 ◽

Vol 9 (1) ◽

Cited By ~ 55

Author(s):

Lichen Liu ◽

Dmitri N. Zakharov ◽

Raul Arenal ◽

Patricia Concepcion ◽

Eric A. Stach ◽

...

Keyword(s):

Metal Species ◽

In Situ Tem ◽

Confined Space

Download Full-text

Triethyl phosphate in an antisolvent: a novel approach to fabricate high-efficiency and stable perovskite solar cells under ambient air conditions

Materials Chemistry Frontiers ◽

10.1039/d1qm00680k ◽

2021 ◽

Vol 5 (20) ◽

pp. 7628-7637

Author(s):

Pengyun Zhang ◽

Ningxia Gu ◽

Xiang Chen ◽

Lixin Song ◽

Pingfan Du ◽

...

Keyword(s):

Solar Cells ◽

High Efficiency ◽

Perovskite Solar Cells ◽

Ambient Air ◽

Good Stability ◽

Triethyl Phosphate ◽

Ambient Conditions ◽

Novel Approach

In this contribution, PSCs with a high efficiency and good stability are fabricated under ambient conditions without a glove box via introducing triethyl phosphate (TEP) into a perovskite through an antisolvent.

Download Full-text

Nanocrystalline semiconductor LEDs with simple structure and high efficiency

MRS Proceedings ◽

10.1557/proc-771-l4.49 ◽

2003 ◽

Vol 771 ◽

Author(s):

Dietrich Bertram ◽

Volker Weiler ◽

Dimitri Talapin ◽

Horst Weller

Keyword(s):

High Efficiency ◽

Organic Materials ◽

Visible Spectrum ◽

Semiconductor Nanoparticles ◽

Solution Chemistry ◽

Inorganic Nanoparticles ◽

Ambient Conditions ◽

High Quality ◽

Synthesis Conditions ◽

Nanocrystalline Semiconductor

AbstractNanocrystalline semiconductor particles exhibit a size dependent bandgap emission, due to size quantisation effects. These particles are derived from solution chemistry and can be made monodisperse under the right synthesis conditions. Compared to organic materials, the inorganic nanoparticles show much higher stability against oxidation and degradation, which makes them an interesting candidate for LEDs and displays. So far, LEDs based on semiconductor nanoparticles typically included low stability organic materials to provide charge injection. The talk will present a new class of nanoparticle LEDs, made without sensitive organic materials. These LEDs show high efficiencies, well defined color throughout the red to green part of the visible spectrum and improved stability under ambient conditions without excessive encapsulation. Using high quality monodisperse suspensions, high color purity is achieved for the emission which paves the road to cheap, high quality displays based on inorganic semiconductor nanoparticles.

Download Full-text

Ambient air-processed mixed-ion perovskites for high-efficiency solar cells

Journal of Materials Chemistry A ◽

10.1039/c6ta06912f ◽

2016 ◽

Vol 4 (42) ◽

pp. 16536-16545 ◽

Cited By ~ 37

Author(s):

Kári Sveinbjörnsson ◽

Kerttu Aitola ◽

Jinbao Zhang ◽

Malin B. Johansson ◽

Xiaoliang Zhang ◽

...

Keyword(s):

Solar Cells ◽

Solar Cell ◽

High Efficiency ◽

Ambient Air ◽

Perovskite Solar Cell ◽

Ambient Conditions ◽

Average Efficiency ◽

High Efficiency Solar Cells

A mixed-ion (FAPbI3)1−x(MAPbBr3)x perovskite solar cell was prepared under ambient conditions with an average efficiency of 17.6%.

Download Full-text

Energy and Exergy Analysis of Gasifier-Based Coal-to-Fuel Systems

Journal of Energy Resources Technology ◽

10.1115/1.4001572 ◽

2010 ◽

Vol 132 (2) ◽

Cited By ~ 12

Author(s):

Yunhua Zhu ◽

Sriram Somasundaram ◽

James W. Kemp

Keyword(s):

Exergy Analysis ◽

High Efficiency ◽

Second Law Of Thermodynamics ◽

Conservation Of Energy ◽

Transportation Fuels ◽

Synthetic Natural Gas ◽

Entrained Flow ◽

Technology Improvement ◽

Entrained Flow Gasifier ◽

Construction Operation

National energy security concerns related to liquid transportation fuels have revived interests in alternative liquid fuel sources. Coal-to-fuel technologies feature high efficiency energy conversion and environmental advantages. While a number of factors are driving coal-to-fuel projects forward, there are several barriers to wide commercialization of these technologies such as financial, construction, operation, and technical risks. The purpose of this study is to investigate the performance features of coal-to-fuel systems based on different gasification technologies. The target products are the Fischer–Tropsch synthetic crude and synthetic natural gas. Two types of entrained-flow gasifier-based coal-to-fuel systems are simulated and their performance features are discussed. One is a single-stage water quench cooling entrained-flow gasifier, and another one is a two-stage syngas cooling entrained-flow gasifier. The conservation of energy (first law of thermodynamics) and the quality of energy (second law of thermodynamics) for the systems are both investigated. The results of exergy analysis provide insights about the potential targets for technology improvement. The features of different gasifier-based coal-to-fuel systems are discussed. The results provide information about the research and development priorities in future.

Download Full-text