Design of a highly active base catalyst through utilizing organic-solvent-treated layered silicate Hiroshima University Silicates

2017 ◽  
Vol 46 (23) ◽  
pp. 7441-7450 ◽  
Author(s):  
Nao Tsunoji ◽  
Mahuya Bandyopadhyay ◽  
Yuya Yagenji ◽  
Hidechika Nishida ◽  
Masahiro Sadakane ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Layered Silicate ◽  
Catalytic Performance ◽  
Base Catalyst ◽  
Highly Active ◽  
Active Base

A layered-silicate base catalyst prepared by utilizing organic-solvent-treated HUS-7 exhibited remarkably high catalytic performance for the transesterification of triacetin.

Applications of pore-expanded MCM-41 silica: 4. Synthesis of a highly active base catalyst

2007 ◽  
Vol 8 (5) ◽  
pp. 829-833 ◽  
Author(s):  
Dharani D. Das ◽  
Peter J.E. Harlick ◽  
Abdelhamid Sayari
Keyword(s):  
Base Catalyst ◽  
Highly Active ◽  
Active Base ◽  
Mcm 41

scholarly journals Cs-Beta with an Al-rich composition as a highly active base catalyst for Knoevenagel condensation

2019 ◽  
Vol 575 ◽  
pp. 20-24 ◽  
Author(s):  
Ryoichi Otomo ◽  
Ryota Osuga ◽  
Junko N. Kondo ◽  
Yuichi Kamiya ◽  
Toshiyuki Yokoi
Keyword(s):  
Knoevenagel Condensation ◽  
Base Catalyst ◽  
Highly Active ◽  
Active Base

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

scholarly journals Methane Conversion to Liquid Hydrocarbons over W-ZSM-5 and W Loaded Cu/HZSM-5

2006 ◽  
Vol 6 (2) ◽  
pp. 58 ◽  
Author(s):  
Didi Dwi Anggoro ◽  
Nor Aishah Saidina Amin
Keyword(s):  
Methane Conversion ◽  
Principal Component ◽  
Acid Catalyst ◽  
Liquid Hydrocarbon ◽  
Direct Conversion ◽  
Catalytic Performance ◽  
Liquid Hydrocarbons ◽  
Oxidation Of Methane ◽  
Highly Active ◽  
To Come

The direct conversion of natural gas-in particular, its principal component, methane into useful products has been the subject of intense study over the past decades. However, commercialization of this process is still not viable because its conversion and selectivity potentials remain low. Thus, the search continues to come up with a suitable catalyst that allows methane to be oxidized in a controlled environment to yield a high percentage of higher hydrocarbons. ZSM-5 zeolite has been known to be a suitable catalyst for olefin oligomerization. Previous studies, however, have indicated that ZSM-5 zeolites are not resistant to high temperatures. In this work, ZSM-5 was modified with copper and tungsten to develop a highly active and heat-resistant bifunctional oxidative acid catalyst. The oxidation of methane was performed over W/Cu/HZSM-5 catalyst and the results compared with the catalytic performance of W/ HZSM-5 and HZSM-5 catalysts. The metal oxide on the catalyst surface led to enhanced conversion of Hz and CO to CZ-3 ydrocarbons and, hence, reduced HzO selectivity. Inh the liquid hydrocarbons, Cs+ selectivity increased with increasing amount of surface Bn1Jnstedacid sites. The experimental results indicated higher methane conversion and liquid hydrocarbon selectivity than that of W/3.0Cu/HZSM-5 catalyst.

Mesoporous CoO-supported palladium nanocatalysts with high performance for o-xylene combustion

2018 ◽  
Vol 8 (3) ◽  
pp. 806-816 ◽  
Author(s):  
Shaohua Xie ◽  
Yuxi Liu ◽  
Jiguang Deng ◽  
Jun Yang ◽  
Xingtian Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Catalytic Combustion ◽  
Active Oxygen Species ◽  
Catalytic Performance ◽  
Active Oxygen ◽  
Oxygen Species ◽  
Highly Active ◽  
Palladium Nanocatalysts ◽  
Supported Palladium

The adsorbed o-xylene species can immediately react with active oxygen species at the highly active Pd–CoO interface between Pd NPs and meso-CoO, thus resulting in good catalytic performance of Pd/meso-CoO for o-xylene catalytic combustion.

Non Precious Metal Catalysts: A Fuel Cell and ORR Study of Thermally Synthesized Nickel and Platinum Mixed Nickel Nanotubes for PEMFC

2021 ◽  
Vol 875 ◽  
pp. 193-199
Author(s):  
Ahmad Shahbaz ◽  
Ali Afaf ◽  
Nawaz Tahir ◽  
Ullah Abid ◽  
Saher Saim
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Rotating Disk ◽  
Platinum Group Metal ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Rotating Disk Electrode ◽  
Highly Active ◽  
Precious Metal Catalysts

A highly active Platinum Group Metal (PGM) and non-PGM electrocatalysts with thermally extruded nanotubes have been prepared for Proton Exchange Membrane (PEM) fuel cell by sintering Nickel zeolitic imidazole framework (Ni-ZIF). Preeminent electro-catalytic activities have been observed through single fuel cell tests and rotating disk electrode (RDE). This study involves the comparison of Oxygen Reduction Reaction (ORR) activities and fuel cell (FC) test station performance of two catalyst Nickel and Platinum mixed Nickel nanotubes (Ni NT, Ni/Pt NT) respectively. The acidic cells with corresponding Ni and Ni/Pt catalysts delivers peak power densities of 325 mWcm-2 and 455 mWcm-2 at 75 °C inside fuel cell. Our results indicate that, the synthesized Nickel nanotubes has profound effect on catalytic performance of both PGM and non-PGM electro catalysts.

Highly active and stable Zn/ZSM-5 zeolite catalyst for the conversion of methanol to aromatics: effect of support morphology

2018 ◽  
Vol 8 (21) ◽  
pp. 5646-5656 ◽  
Author(s):  
Kai Wang ◽  
Mei Dong ◽  
Xianjun Niu ◽  
Junfen Li ◽  
Zhangfeng Qin ◽  
...  
Keyword(s):  
Zeolite Catalyst ◽  
Catalytic Performance ◽  
Highly Active ◽  
Modification Effect ◽  
Zeolite Supports ◽  
Effect Of Support

The regulation of the morphology of HZSM-5 zeolite supports on the modification effect of zinc, as well as their subsequent catalytic performance for the methanol-to-aromatics (MTA) process were investigated.

scholarly journals Utilization of Carbide Lime Waste as Base Catalyst for Biodiesel Production

2018 ◽  
Vol 7 (4.35) ◽  
pp. 700 ◽  
Author(s):  
Koguleshun Subramaniam ◽  
Sasidevan Munusamy ◽  
Fei-ling Pua ◽  
Mohd Aizat Mohd Nasir ◽  
Rohaya Othman ◽  
...  
Keyword(s):  
Ester Group ◽  
Catalytic Performance ◽  
Biodiesel Production ◽  
Strength Analysis ◽  
Solid Base ◽  
Base Catalyst ◽  
Solid Base Catalyst ◽  
X Ray ◽  
Solid Base Catalysts ◽  
Base Catalysts

Calcium rich solid base catalyst was synthesized from local waste carbide lime and its catalytic performance was evaluated via biodiesel production. Carbide lime waste was used to produce CLW-I and CLW-II solid base catalyst using different preparation methods. Characterization including base strength analysis, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) were investigated. Catalytic strength was examined by deploying the solid base catalysts for transesterification reaction of palm oil. Fourier Transform Infra-red (FTIR) was used to analyze the presence of ester group in biodiesel. The yield of biodiesel conversion was calculated based on the mass of biodiesel and glycerol. The highest biodiesel conversion rate of 75.30% was achieved by CLW-I solid base catalyst at 9% loading. The good catalytic performance of carbide lime waste derived solid base catalysts proves that it has high potential to replace the usage of conventional catalyst in the biodiesel industry.

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