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Relevant bibliographies by topics / Isothermal hydrogenation

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Journal articles

Academic literature on the topic 'Isothermal hydrogenation'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Isothermal hydrogenation"

1

Li, Jingzhu, Peng Fan, Zhigang Zak Fang, and Chengshang Zhou. "Kinetics of isothermal hydrogenation of magnesium with TiH2 additive." International Journal of Hydrogen Energy 39, no. 14 (2014): 7373–81. http://dx.doi.org/10.1016/j.ijhydene.2014.02.159.

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2

Gunawan, Melia Laniwati, IGBN Makertihartha, and Subagjo Subagjo. "Kinetika Reaksi Hidrogenasi Ester Lemak Menjadi Alkohol Lemak Dengan Katalis Tembaga- Mangan." Indo. J. Chem. Res. 8, no. 1 (2020): 21–27. http://dx.doi.org/10.30598/10.30598//ijcr.2020.8-mel.

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Fatty alcohol (FAOH) can be produced by hydrogenating of fatty acid methyl ester (FAME) using the copper-based catalyst. Copper-Chrom (Cu-Cr) is the best catalyst for high-pressure reaction condition, which is copper (Cu) as the main active component and chrom (Cr) as a promoter. Since Cr is feared to be toxic, one of the best replacement candidates is manganese (Mn). The research aims is to find the kinetic equation of hydrogenation FAME to FAOH using a Cu-Mn commercial catalyst. FAME with methyl laurate and methyl myristate as the main compounds is used as feedstock. The main products are lauryl alcohol and myristyl alcohol. The reaction was carried out in an isothermal continuous fixed bed reactor under conditions of temperature 220 – 240 oC, pressure 50 bar, and liquid hourly space velocity (LHSV) 5-12.5 hr-1. The kinetic equation is determined using the power law model. The FAME hydrogenation on copper - manganese catalyst is the half order reaction. The activation energy value is 86.32 kJ/mol and the Arrhenius constant value is 5.87x106 M0.5/s.

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3

Čapek, Pavel, and Karel Klusáček. "Kinetically induced multiple steady states during acetylene hydrogenation." Collection of Czechoslovak Chemical Communications 55, no. 7 (1990): 1708–20. http://dx.doi.org/10.1135/cccc19901708.

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An isothermal reaction model of acetylene hydrogenation on palladium catalyst is described. Steady-state solutions of the mass balances in a CSTR display regions of multiplicity caused by the very distinct rate and strength of adsorption and desorption of acetylene and hydrogen, respectively. Uniqueness and local stability of this model are investigated numerically; oscillatory behaviour is predicted to be absent for typical conditions.

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4

Li, Jingzhu, Chengshang Zhou, Zhigang Zak Fang, Robert C. Bowman Jr., Jun Lu, and Chai Ren. "Isothermal hydrogenation kinetics of ball-milled nano-catalyzed magnesium hydride." Materialia 5 (March 2019): 100227. http://dx.doi.org/10.1016/j.mtla.2019.100227.

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5

Kačer, Petr, Leiv Laate, and Libor Červený. "Competitive Catalytic Hydrogenation in Unsaturated Hydrocarbon Systems With Sterically Hindered Double Bonds." Collection of Czechoslovak Chemical Communications 63, no. 11 (1998): 1915–26. http://dx.doi.org/10.1135/cccc19981915.

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A competitive hydrogenation of unsaturated hydrocarbons (a-methylstyrene, cyclohexene, 1-methylcyclohex-1-ene, 1-tert-butylcyclohex-1-ene and 3-tert-butylcyclohex-1-ene) in binary and ternary systems with palladium-, platinum- and rhodium-supported catalysts in a semibatch isothermal reactor at 20 °C under atmospheric pressure was studied. It was found that considerable variance in selectivity values of competitive hydrogenation in a series of substrates with increasing substituent bulkiness is caused by differences in adsorption and in reactivity of adsorbed molecules. In the case of ternary systems, a change in selectivity of competitive hydrogenation of two substrates was observed, due to the presence of a third substance, caused by a competitive adsorption of all three substrates and their interaction on a catalytic surface.

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6

Lin, Ying Ying, Miao Quan Li, Y. Niu, and W. F. Zhang. "Effect of Hydrogenation on the Microstructure during the Isothermal Compression of Ti-5.6Al-4.8Sn-2.0Zr-1.0Mo Alloy." Materials Science Forum 551-552 (July 2007): 417–20. http://dx.doi.org/10.4028/www.scientific.net/msf.551-552.417.

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Isothermal compression tests were carried out on the Ti-5.6Al-4.8Sn-2.0Zr-1.0Mo alloy with and without hydrogen. A series of experiments including the optical microstructure and TEM (Transmission Electron Microscope) were performed to the compressed samples. The results show that hydrogenation not only increases the fraction ofβ phase, but also activates the propagation of the dislocation and formation of the twins, which are benefit for plastic or superplastic formability.

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7

Vasiliades, Michalis A., Konstantina K. Kyprianou, Nilenindran S. Govender, et al. "The Effect of CO Partial Pressure on Important Kinetic Parameters of Methanation Reaction on Co-Based FTS Catalyst Studied by SSITKA-MS and Operando DRIFTS-MS Techniques." Catalysts 10, no. 5 (2020): 583. http://dx.doi.org/10.3390/catal10050583.

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A 20 wt% Co-0.05 wt% Pt/γ-Al2O3 catalyst was investigated to obtain a fundamental understanding of the effect of CO partial pressure (constant H2 partial pressure) on important kinetic parameters of the methanation reaction (x vol% CO/25 vol% H2, x = 3, 5 and 7) by performing advanced transient isotopic and operando diffuse reflectance infrared Fourier transform spectroscopy–mass spectrometry (DRIFTS-MS) experiments. Steady State Isotopic Transient Kinetic Analysis (SSITKA) experiments conducted at 1.2 bar, 230 °C after 5 h in CO/H2 revealed that the surface coverages, θCO and θCHx and the mean residence times, τCO, and τCHx (s) of the reversibly adsorbed CO-s and active CHx-s (Cα) intermediates leading to CH4, respectively, increased with increasing CO partial pressure. On the contrary, the apparent activity (keff, s−1) of CHx-s intermediates, turnover frequency (TOF, s−1) of methanation reaction, and the CH4-selectivity (SCH4, %) were found to decrease. Transient isothermal hydrogenation (TIH) following the SSITKA step-gas switch provided important information regarding the reactivity and concentration of active (Cα) and inactive -CxHy (Cβ) carbonaceous species formed after 5 h in the CO/H2 reaction. The latter Cβ species were readily hydrogenated at 230 °C in 50%H2/Ar. The surface coverage of Cβ was found to vary only slightly with increasing CO partial pressure. Temperature-programmed hydrogenation (TPH) following SSITKA and TIH revealed that other types of inactive carbonaceous species (Cγ) were formed during Fischer-Tropsch Synthesis (FTS) and hydrogenated at elevated temperatures (250–550 °C). The amount of Cγ was found to significantly increase with increasing CO partial pressure. All carbonaceous species hydrogenated during TIH and TPH revealed large differences in their kinetics of hydrogenation with respect to the CO partial pressure in the CO/H2 reaction mixture. Operando DRIFTS-MS transient isothermal hydrogenation of adsorbed CO-s formed after 2 h in 5 vol% CO/25 vol% H2/Ar at 200 °C coupled with kinetic modeling (H-assisted CO hydrogenation) provided information regarding the relative reactivity (keff) for CH4 formation of the two kinds of linear-type adsorbed CO-s on the cobalt surface.

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8

Smarzhevskaya, A. I., S. A. Nikitin, Viktor N. Verbetsky, Wacław Iwasieczko, and Alexey N. Golovanov. "The Magnetocaloric Effect and Magnetic Transitions in Hydride Compounds: GdNiH_3.2 and TbNiH_3.4." Solid State Phenomena 233-234 (July 2015): 243–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.243.

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The paper presents the investigation of GdNiH3.2 and TbNiH3.4 hydrides magnetic transitions and magnetocaloric properties. The isothermal magnetization data in the fields up to 5T are obtained for GdNi and TbNi compounds and their hydrides and the values of magnetic entropy change are calculated. The maximum values of magnetic entropy change ΔSM in GdNiH3.2 and TbNiH3.4 are extremely large. It is shown that the hydrogenation shifts ΔSM(T) maximum to lower temperatures.

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9

Huang, Shu Hui, Ying Ying Zong, and De Bin Shan. "Research on Law and Mechanism of Hydrogen Induced Softening in Ti6Al4V Alloy in the Temperature Range 400 °C to 1010 °C." Advanced Materials Research 1120-1121 (July 2015): 1202–7. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.1202.

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The law and mechanism of hydrogen induced softening in Ti6Al4V alloy in the temperature range 400 °C to 1010 °C are researched by lots of isothermal hot compression experiment in this paper. The relationship between σh (the true stress when the test is compressed to half of its original height) and CH (hydrogen content) is investigated to describe the law. The results show that, Between 400 °C and 450 °C, the plasticity increases at first, and then decreases and the strength is almost changeless with the CH rising. Between 480 °C and 950 °C, the strength decreases at first, and then increases with the CH rising. In α+β phase region, the strength decreases with the CH rising. In β phase region, the strength increases with the CH rising. Hydrogenation induced α phase high temperature softening and hydrogenation promoting α→β phase transition are the main reasons for hydrogen induced titanium alloy softening. Hydrogenation induced β phase solution strengthening is the reason for hydrogen induced titanium alloy strengthening. And the relationship between furnace temperature and vacuum is investigated during dehydrogenation heat treatment.

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10

Shen, Chia-Chieh, Chung-Min Wang, and Hsin-Hung Chen. "Advanced nanostructured equiaxed Ti-6Al-4V alloys prepared via an isothermal hydrogenation process." Journal of Alloys and Compounds 657 (February 2016): 794–800. http://dx.doi.org/10.1016/j.jallcom.2015.10.124.

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