Hydrocarbon Conversion Reactions over the Pt-Re Bimetallic Catalysts Modified by Sulfur

2020 ◽  
pp. 511-514
Author(s):  
Changmin Kim ◽  
Gabor A. Somorjai
Keyword(s):  
Bimetallic Catalysts ◽  
Hydrocarbon Conversion

Electron Microscopy of Bimetallic Catalysts under Controlled Atmosphere

1982 ◽  
Vol 40 ◽  
pp. 644-647
Author(s):  
R. T. K. Baker ◽  
R. D. Sherwood ◽  
J. A. Dumesic
Keyword(s):  
Electron Microscopy ◽  
Bimetallic Catalysts ◽  
Carbon Deposition ◽  
High Vacuum ◽  
Controlled Atmosphere ◽  
Surface Chemical ◽  
High Tolerance ◽  
Hydrocarbon Conversion ◽  
Bimetallic Systems ◽  
Unusual Product

Over recent years there has been considerable interest in the behavior of supported bimetallic systems. They exhibit unusual product selectivity patterns and have a high tolerance toward carbon deposition, features which make them very attractive as catalysts for a variety of hydrocarbon conversion processes. One of the most intriguing problems related to bimetallic catalysts is the question of what is the composition of the surface during exposure to a reactant gas. A number of workers have attempted to solve this issue by the use of sophisticated surface chemical tools, however, many of these approaches suffer from a common limitation, namely, that specimens can only be examined in a post-reaction state and under high vacuum conditions. These drawbacks are readily overcome by controlled atmosphere electron microscopy (CAEM), where it is possible to continuously observe the appearance of a specimen while it is undergoing reaction.

Structure and composition of metal particles in Pt-Sn/Al2O3 bimetallic catalysts

1990 ◽  
Vol 48 (4) ◽  
pp. 278-279
Author(s):  
A. Sachdev ◽  
J. Schwank
Keyword(s):  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Size Structure ◽  
High Surface ◽  
High Surface Area ◽  
Metal Particles ◽  
Alloy Formation ◽  
Particle Size Range ◽  
Oxide Supports ◽  
Petroleum Fractions

Platinum - tin bimetallic catalysts have been primarily utilized in the chemical industry in the catalytic reforming of petroleum fractions. In this process the naphtha feedstock is converted to hydrocarbons with higher octane numbers and high anti-knock qualities. Most of these catalysts contain small metal particles or crystallites supported on high surface area insulating oxide supports. The determination of the structure and composition of these particles is crucial to the understanding of the catalytic behavior. In a bimetallic catalyst it is important to know how the two metals are distributed within the particle size range and in what way the addition of a second metal affects the size, structure and composition of the metal particles. An added complication in the Pt-Sn system is the possibility of alloy formation between the two elements for all atomic ratios.

Nb2C MXene assisted CoNi bimetallic catalysts for hydrogenolysis of aromatic ethers

2021 ◽  
Author(s):  
Sen-Wang Wang ◽  
Zhen-Hong He ◽  
Jian-Gang Chen ◽  
Kuan Wang ◽  
Zhong-Yu Wang ◽  
...  
Keyword(s):  
Bimetallic Catalysts ◽  
Precious Metal ◽  
Renewable Biomass ◽  
Biomass Resources

Hydrogenolysis of biomass-derived lignin sources is highly important for the conversion of renewable biomass resources to biofuels. However, lots of developed catalysts suffer from the drawbacks of expensive precious metal...

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.

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