Journal ArticleDOI
The kinetics of ethylene hydrogenation catalyzed by metallic palladium
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TLDR
The activity of Pd(111) for ethylene hydrogenation is measured using a high-pressure reactor incorporated into an ultrahigh vacuum chamber for temperatures between 300 and 475 K, ethylene pressures between 50 and 300 K and hydrogen pressures from 45 to 600 K.Abstract:
The activity of Pd(111) for ethylene hydrogenation is measured using a high-pressure reactor incorporated into an ultrahigh vacuum chamber for temperatures between 300 and 475 K, ethylene pressures between 50 and 300 Torr and hydrogen pressures from 45 to 600 Torr. The reaction rate is found to be rapid with turnover frequencies up to ∼400 reactions/site/s (where rates are referenced to the atom site density on the (111) face of palladium). The measured activation energy is ∼35 kJ/mol. A hydrogen reaction order of ∼1.02 was found at a reaction temperature of 300 K and an ethylene pressure of 100 Torr, where the hydrogen reaction order was found to depend on temperature. A negative reaction order of ∼−0.22 was found in ethylene pressure at a reaction temperature of 320 K and a hydrogen pressure of 100 Torr. The reaction rates are in good agreement with values obtained on silica-supported palladium and with other work on palladium single crystals.read more
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Ag Alloyed Pd Single-Atom Catalysts for Efficient Selective Hydrogenation of Acetylene to Ethylene in Excess Ethylene
Guang Xian Pei,Guang Xian Pei,Xiaoyan Liu,Aiqin Wang,Adam F. Lee,Mark A. Isaacs,Lin Li,Xiaoli Pan,Xiaofeng Yang,Xiaodong Wang,Zhijun Tai,Karen Wilson,Tao Zhang +12 more
TL;DR: In this article, a series of Ag alloyed Pd single-atom catalysts, supported on silica gel, were prepared by a simple incipient wetness co-impregnation method and applied to the selective hydrogenation of acetylene in an ethylene-rich stream under conditions close to the front-end employed by industry.
Journal ArticleDOI
Selective Hydrogenation of Ethyne in Ethene‐Rich Streams on Palladium Catalysts, Part 2: Steady‐State Kinetics and Effects of Palladium Particle Size, Carbon Monoxide, and Promoters
TL;DR: In this paper, a review of the last three decades of kinetics of selective hydrogenation of ethyne in ethene-rich streams on palladium catalysts is presented.
Journal ArticleDOI
A Chemically Stable Hofmann-Type Metal-Organic Framework with Sandwich-Like Binding Sites for Benchmark Acetylene Capture
Jiyan Pei,Kai Shao,Jia-Xin Wang,Hui Min Wen,Yu Yang,Yuanjing Cui,Rajamani Krishna,Bin Li,Guodong Qian +8 more
TL;DR: Theoretical calculations indicate that the oppositely adjacent nickel(II) centers together with cyanide groups from different layers in ZJU-74a can construct a sandwich-type adsorption site to offer dually strong and cooperative interactions for the C2 H2 molecule, thus leading to its ultrahigh C 2 H2 capture capacity and selectivities.
Journal ArticleDOI
Separation of Acetylene from Carbon Dioxide and Ethylene by a Water-Stable Microporous Metal-Organic Framework with Aligned Imidazolium Groups inside the Channels.
Jaechul Lee,Chong Yang Chuah,Jaheon Kim,Youngsuk Kim,Nakeun Ko,Younggyu Seo,Kimoon Kim,Tae-Hyun Bae,Eunsung Lee +8 more
TL;DR: The selective sorption of acetylene over carbon dioxide and ethylene in JCM-1 was successfully demonstrated by equilibrium gas adsorption analysis as well as dynamic breakthrough measurement and its excellent hydrolytic stability makes the separation processes highly recyclable without a substantial loss in acetylene uptake capacity.
Journal ArticleDOI
Three-Dimensional Carbon Nanotube Scaffolds as Particulate Filters and Catalyst Support Membranes
Niina Halonen,Aatto Rautio,Anne Riikka Leino,Teemu Kyllönen,Geza Toth,Jyrki Lappalainen,Krisztian Kordas,Mika Huuhtanen,Riitta L. Keiski,András Sápi,Mária Szabó,Ákos Kukovecz,Zoltán Kónya,Imre Kiricsi,Pulickel M. Ajayan,Robert Vajtai +15 more
TL;DR: It is demonstrated that appropriate engineering of macroscopic-ordered nanotube architectures can lead to multifunctional applications in gas-phase heterogeneous catalysis.
References
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Journal ArticleDOI
Exchange reactions of hydrogen on metallic catalysts
Iurô Horiuti,M. Polanyi +1 more
Journal ArticleDOI
Ethylene Hydrogenation on Pt(111) Monitored in Situ at High Pressures Using Sum Frequency Generation
TL;DR: In this article, the infrared−visible sum frequency generation (SFG) has been used to monitor the surface vibrational spectrum in situ during ethylene hydrogenation on Pt(111), where measurements were made near 1 atm of total pressure of ethylene and hydrogen and at 295 K.
Journal ArticleDOI
Hydrogenation of ethylene over platinum (111) single-crystal surfaces
TL;DR: In this article, the hydrogenation of ethylene with both hydrogen and deuterium was studied over (111) platinum single-crystal surfaces under a total pressure of 110 torr and a temperature range of 300-370 K.
Journal ArticleDOI
Hydrogenation on metal surfaces: why are nanoparticles more active than single crystals?
TL;DR: Under low-pressure conditions, hydrogenation of alkenes, such as 2-pentene and ethene, is shown to occur on supported palladium nanoparticles, whereas single-crystal palladium surfaces are inactive.
Journal ArticleDOI
Mechanism and kinetics of the selective hydrogenation of ethyne and ethene
TL;DR: A review of the kinetics and mechanism for the selective hydrogenation of ethyne and ethene on palladium catalysts is presented in this paper, where it has become clear that the classical view, where the selectivity of the reaction was believed to be due to the thermodynamic factor is an over-simplification.