Solid-Solution Alloying of Immiscible Pt and AU Boosts Catalytic Performance for H2o2 Direct Synthesis

2020 ◽  
Author(s):  
Hong Woo Lee ◽  
Hyobin Nam ◽  
Geun-Ho Han ◽  
Young-Hoon Cho ◽  
Byung Chul Yeo ◽  
...  
Keyword(s):  
Solid Solution ◽  
Direct Synthesis ◽  
Catalytic Performance ◽  
H2o2 Direct Synthesis

Solid-solution alloying of immiscible Pt and Au boosts catalytic performance for H2O2 direct synthesis

2021 ◽  
Vol 205 ◽  
pp. 116563
Author(s):  
Hong Woo Lee ◽  
Hyobin Nam ◽  
Geun-Ho Han ◽  
Young-Hoon Cho ◽  
Byung Chul Yeo ◽  
...  
Keyword(s):  
Solid Solution ◽  
Direct Synthesis ◽  
Catalytic Performance ◽  
H2o2 Direct Synthesis

scholarly journals Tunable Catalytic Performance of Palladium Nanoparticles for H2O2 Direct Synthesis via Surface-Bound Ligands

ACS Catalysis ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 5202-5207 ◽  
Author(s):  
Lucas F. de L. e Freitas ◽  
Begoña Puértolas ◽  
Jing Zhang ◽  
Bingwen Wang ◽  
Adam S. Hoffman ◽  
...  
Keyword(s):  
Palladium Nanoparticles ◽  
Direct Synthesis ◽  
Catalytic Performance ◽  
H2o2 Direct Synthesis

Direct Synthesis of DMC from CO2 and CH3OH over CexZr 1-x-0.1Y 0.1 O2 Catalysts

2011 ◽  
Vol 287-290 ◽  
pp. 1632-1635 ◽  
Author(s):  
Zhi Fang Zhang ◽  
Rui Bing Wang ◽  
Xiang Rong Ma
Keyword(s):  
Solid Solution ◽  
Catalytic Activity ◽  
Solid Solutions ◽  
Dimethyl Carbonate ◽  
Direct Synthesis ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Solid Solution Series ◽  
Calcination Temperatures ◽  
Bimodal Pore Structure

The solid solution series CexZr(1-x-0.1)Y0.1O2 with various x values was prepared by the citric acid sol-gel method, using cerium and zirconium nitrides as precursors, respectively.The characterization results of the XRD, N2 sorption measurements indicated that the physical properties of the solid solutions were significantly affected by the x values in CexZr(1-x-0.1)Y0.1O2 and the calcination temperatures. These solid solutions can be used as catalyst for the direct synthesis of dimethyl carbonate from CH3OH and CO2. Results indicated that the catalytic activity for DMC synthesis was influenced by the structure of the solid solutions and the x values in CexZr(1-x-0.1)Y0.1O2. The optimized Ce0.5Zr0.4Y0.1O2 with bimodal pore structure exhibited higher catalytic performance to DMC synthesis.

scholarly journals High-throughput computational-experimental screening protocol for the discovery of bimetallic catalysts

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Byung Chul Yeo ◽  
Hyunji Nam ◽  
Hyobin Nam ◽  
Min-Cheol Kim ◽  
Hong Woo Lee ◽  
...  
Keyword(s):  
High Throughput ◽  
Bimetallic Catalysts ◽  
High Throughput Screening ◽  
Direct Synthesis ◽  
Catalytic Performance ◽  
Platinum Group Metals ◽  
Pt Catalyst ◽  
Electronic Density ◽  
Bimetallic Alloy ◽  
Screening Protocol

AbstractTo accelerate the discovery of materials through computations and experiments, a well-established protocol closely bridging these methods is required. We introduce a high-throughput screening protocol for the discovery of bimetallic catalysts that replace palladium (Pd), where the similarities in the electronic density of states patterns were employed as a screening descriptor. Using first-principles calculations, we screened 4350 bimetallic alloy structures and proposed eight candidates expected to have catalytic performance comparable to that of Pd. Our experiments demonstrate that four bimetallic catalysts indeed exhibit catalytic properties comparable to those of Pd. Moreover, we discover a bimetallic (Ni-Pt) catalyst that has not yet been reported for H2O2 direct synthesis. In particular, Ni61Pt39 outperforms the prototypical Pd catalyst for the chemical reaction and exhibits a 9.5-fold enhancement in cost-normalized productivity. This protocol provides an opportunity for the catalyst discovery for the replacement or reduction in the use of the platinum-group metals.

Direct synthesis, characterization and catalytic performance of Al-SBA-15 mesoporous catalysts with varying Si/Al molar ratios

2012 ◽  
Vol 20 (3) ◽  
pp. 539-546 ◽  
Author(s):  
Xiucheng Zheng ◽  
Beibei Dong ◽  
Chengyuan Yuan ◽  
Ke Zhang ◽  
Xiangyu Wang
Keyword(s):  
Direct Synthesis ◽  
Catalytic Performance ◽  
Mesoporous Catalysts ◽  
Molar Ratios

scholarly journals Hierarchical H-ZSM5 zeolites based on natural kaolinite as a high-performance catalyst for methanol to aromatic hydrocarbons conversion

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ahmad Asghari ◽  
Mohammadreza Khanmohammadi Khorrami ◽  
Sayed Habib Kazemi
Keyword(s):  
Pore Size ◽  
Aromatic Hydrocarbons ◽  
High Performance ◽  
Low Cost ◽  
Direct Synthesis ◽  
Fixed Bed ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Good Prospect

AbstractThe present work introduces a good prospect for the development of hierarchical catalysts with excellent catalytic performance in the methanol to aromatic hydrocarbons conversion (MTA) process. Hierarchical H-ZSM5 zeolites, with a tailored pore size and different Si/Al ratios, were synthesized directly using natural kaolin clay as a low-cost silica and aluminium resource. Further explored for the direct synthesis of hierarchical HZSM-5 structures was the steam assisted conversion (SAC) with a cost-effective and green affordable saccharide source of high fructose corn syrup (HFCS), as a secondary mesopore agent. The fabricated zeolites exhibiting good crystallinity, 2D and 3D nanostructures, high specific surface area, tailored pore size, and tunable acidity. Finally, the catalyst performance in the conversion of methanol to aromatic hydrocarbons was tested in a fixed bed reactor. The synthesized H-ZSM5 catalysts exhibited superior methanol conversion (over 100 h up to 90%) and selectivity (over 85%) in the methanol conversion to aromatic hydrocarbon products.

scholarly journals Direct Synthesis of Oxynitride Nanowires through Atmospheric Pressure Chemical Vapor Deposition

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2507
Author(s):  
Babak Adeli ◽  
Fariborz Taghipour
Keyword(s):  
Solid Solution ◽  
Vapor Deposition ◽  
Atmospheric Pressure ◽  
Wide Spectrum ◽  
Direct Synthesis ◽  
Chemical Vapor ◽  
Building Blocks ◽  
Operating Conditions ◽  
Wide Range ◽  
Pressure Chemical

Binary and ternary oxynitride solid alloys were studied extensively in the past decade due to their wide spectrum of applications, as well as their peculiar characteristics when compared to their bulk counterparts. Direct bottom-up synthesis of one-dimensional oxynitrides through solution-based routes cannot be realized because nitridation strategies are limited to high-temperature solid-state ammonolysis. Further, the facile fabrication of oxynitride thin films through vapor phase strategies has remained extremely challenging due to the low vapor pressure of gaseous building blocks at atmospheric pressure. Here, we present a direct and scalable catalytic vapor–liquid–solid epitaxy (VLSE) route for the fabrication of oxynitride solid solution nanowires from their oxide precursors through enhancing the local mass transfer flux of vapor deposition. For the model oxynitride material, we investigated the fabrication of gallium nitride and zinc oxide oxynitride solid solution (GaN:ZnO) thin film. GaN:ZnO nanowires were synthesized directly at atmospheric pressure, unlike the methods reported in the literature, which involved multiple-step processing and/or vacuum operating conditions. Moreover, the dimensions (i.e., diameters and length) of the synthesized nanowires were tailored within a wide range.

Sign in / Sign up

Export Citation Format

Share Document