Effect of Zn Content on Catalytic Activity and Physicochemical Properties of Ni-Based Catalysts for Selective Hydrogenation of Acetylene

1997 ◽  
Vol 171 (1) ◽  
pp. 268-278 ◽  
Author(s):  
J.C. Rodrı́guez ◽  
A.J. Marchi ◽  
A. Borgna ◽  
A. Monzón
Keyword(s):  
Catalytic Activity ◽  
Physicochemical Properties ◽  
Selective Hydrogenation ◽  
Selective Hydrogenation Of Acetylene ◽  
Zn Content

Selective Hydrogenation of Acetylene and Physicochemical Properties of Pd–Fe/Al2O3 Bimetallic Catalysts

2018 ◽  
Vol 92 (5) ◽  
pp. 862-869 ◽  
Author(s):  
V. D. Stytsenko ◽  
D. P. Mel’nikov ◽  
O. P. Tkachenko ◽  
E. V. Savel’eva ◽  
A. P. Semenov ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Selective Hydrogenation ◽  
Bimetallic Catalysts ◽  
Selective Hydrogenation Of Acetylene

Pyrrolic nitrogen-doped carbon nanotubes: physicochemical properties, interactions with Pd and their role in the selective hydrogenation of nitrobenzophenone

RSC Advances ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 109-122 ◽  
Author(s):  
Lucy M. Ombaka ◽  
Patrick G. Ndungu ◽  
Vincent O. Nyamori
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Physicochemical Properties ◽  
Selective Hydrogenation ◽  
Selective Synthesis ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

The selective synthesis of pyrrolic N-CNTs, which promote the catalytic activity, and selectivity of PdN/CNTs used to hydrogenate nitrobenzophenone.

scholarly journals Selective Hydrogenation of Benzene to Cyclohexene over Ru-Zn Catalysts: Investigations on the Effect of Zn Content and ZrO2 as the Support and Dispersant

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 513 ◽  
Author(s):  
Haijie Sun ◽  
Zhihao Chen ◽  
Lingxia Chen ◽  
Huiji Li ◽  
Zhikun Peng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Hydrogenation ◽  
Photoelectron Spectroscopy ◽  
Supported Catalyst ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Impregnation Method ◽  
X Ray ◽  
Zn Content ◽  
Co Precipitation

m-ZrO2 (monoclinic phase) supported Ru-Zn catalysts and unsupported Ru-Zn catalysts were synthesized via the impregnation method and co-precipitation method, respectively. The catalytic activity and selectivity were evaluated for selective hydrogenation of benzene towards cyclohexene formation. Catalyst samples before and after catalytic experiments were thoroughly characterized via X-ray diffraction (XRD), X-ray Fluorescence (XRF), transmission electron microscopy (TEM), N2-sorption, X-ray photoelectron spectroscopy (XPS), H2-temperature programmed reduction (H2-TPR), and a contact angle meter. It was found that Zn mainly existed as ZnO, and its content was increased in Ru-Zn/m-ZrO2 by enhancing the Zn content during the preparation procedure. This results in the amount of formed (Zn(OH)2)3(ZnSO4)(H2O)3 increasing and the catalyst becoming more hydrophilic. Therefore, Ru-Zn/m-ZrO2 with adsorbed benzene would easily move from the oil phase into the aqueous phase, in which the synthesis of cyclohexene took place. The generated cyclohexene then went back into the oil phase, and the further hydrogenation of cyclohexene would be retarded because of the high hydrophilicity of Ru-Zn/m-ZrO2. Hence, the selectivity towards cyclohexene formation over Ru-Zn/m-ZrO2 improved by increasing the Zn content. When the theoretical molar ratio of Zn to Ru was 0.60, the highest cyclohexene yield of 60.9% was obtained over Ru-Zn (0.60)/m-ZrO2. On the other hand, when m-ZrO2 was utilized as the dispersant (i.e., employed as an additive during the reaction), the catalytic activity and selectivity towards cyclohexene synthesis over the unsupported Ru-Zn catalyst was lower than that achieved over the Ru-Zn catalyst with m-ZrO2 as the support. This is mainly because the supported catalyst sample demonstrated superior dispersion of Ru, higher content of (Zn(OH)2)3(ZnSO4)(H2O)3, and a stronger electronic effect between Ru and ZrO2. The Ru-Zn(0.60)/m-ZrO2 was reused 17 times without any regeneration, and no loss of catalytic activity and selectivity towards cyclohexene formation was observed.

scholarly journals Catalytic properties of nanocarbon materials in reaction of selective hydrogenation of acetylene

2021 ◽  
pp. 280-295
Author(s):  
Igor B. Bychko ◽  
◽  
Alexander A. Abakumov ◽  
Andrii I. Trypolskyi ◽  
Peter E. Strizhak ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Hydrogenation ◽  
Noble Metals ◽  
Carbon Nanomaterials ◽  
Catalytic Properties ◽  
Hydrogenation Reaction ◽  
Gas Phases ◽  
Selective Hydrogenation Of Acetylene ◽  
Nanocarbon Materials ◽  
Hydrogenation Reactions

The chapter presents the results of studies of the catalytic properties of nanocarbon materials based on carbon nanotubes and reduced graphene oxide in the hydrogenation of ethylene, acetylene and ethylene-acetylene mixture by molecular hydrogen at atmosphere pressure. The current state of scientific approaches to the creation of nanocarbon metal-free catalysts for the hydrogenation reactions in both liquid and gas phases is presented. A possible nature of active center of the hydrogenation reaction located on the surface of the nanocarbon material is discussed. It is shown that the catalytic activity of the nanocarbon materials is not associated with metal impurities. The correlation between the structural characteristics of carbon nanomaterials and their catalytic properties in the hydrogenation reactions of unsaturated hydrocarbons is demonstrated. A comparative analysis of the catalytic activity of nanocarbon materials and catalysts that contain noble metals in the hydrogenation reaction of acetylene is presented. Finally, the fundamental possibility of creating a nanocarbon catalyst for selective hydrogenation of acetylene in excess ethylene is shown.

A carbonized cobalt catalyst supported by acid-activated clay for the selective hydrogenation of acetylene

2021 ◽  
Author(s):  
Aizat Aitugan ◽  
Sandugash Tanirbergenova ◽  
Yerbol Tileuberdi ◽  
Onuralp Yucel ◽  
Dildara Tugelbayeva ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Cobalt Catalyst ◽  
Selective Hydrogenation Of Acetylene ◽  
Acid Activated Clay

Effect of sodium persulfate treatment on the physicochemical properties and catalytic activity of biochar prepared from spent malt rootlets

2021 ◽  
Vol 9 (2) ◽  
pp. 105071
Author(s):  
Paraskevi Ntzoufra ◽  
John Vakros ◽  
Zacharias Frontistis ◽  
Sotirios Tsatsos ◽  
Georgios Kyriakou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Physicochemical Properties ◽  
Sodium Persulfate

Variability of particle configurations achievable by 2-nozzle flame syntheses of the Au-Pd-TiO2 system and their catalytic behaviors in the selective hydrogenation of acetylene

2018 ◽  
Vol 549 ◽  
pp. 1-7 ◽  
Author(s):  
Boontida Pongthawornsakun ◽  
Okorn Mekasuwandumrong ◽  
Francisco J.Cadete Santos Aires ◽  
Robert Büchel ◽  
Alfons Baiker ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Selective Hydrogenation Of Acetylene

scholarly journals MODIFIED COBALT CATALYSTS FOR HYDROGENATION OF HYDROCARBONS

2020 ◽  
Vol 18 (3) ◽  
pp. 156-161
Author(s):  
A.N. Aitugan ◽  
S.K. Tanirbergenova ◽  
Ye. Tileuberdi ◽  
D. Tugelbayeva
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Process Parameters ◽  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Oxide Content ◽  
Acetylene Hydrogenation ◽  
Aluminum Oxides ◽  
Selective Hydrogenation Of Acetylene ◽  
Chemical Contents

This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene. Cobalt catalysts modified with aluminum oxide having size between 50 to 500 nm were synthesized. Chemical contents and structure of carrier were investigated.  The catalytic activity of 5 % Со /clay and 5% Co/SiAl catalysts at acetylene hydrogenation was studied in the temperature range 100-180 , with a ratio of 1:2 of acetylene and hydrogen. The ethylene yield is 87.8 % in modifying the cobalt catalyst with aluminum oxide, whereas with the same process parameters, the ethylene yield is 72 %. 5 % Cobalt catalysts modified with 1.5 % aluminum oxides are more active in hydrogenation acetylene process than 5 % Со /clay 450 ℃ catalyst.

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