Nickel catalyst in coupled plasma-catalytic system for tar removal

Abstract Tar formation is a significant issue during biomass gasification. Catalytic removal of tars with the use of nickel catalyst allows to obtain high conversion rate but coke formation on catalysts surface lead to its deactivation. Toluene decomposition as a tar imitator was studied in gliding discharge plasma-catalytic system with the use of 5%, 10% and 15% by weight Ni and NiO catalyst on Al2O3 (α-Al2O3) and Peshiney (γ-Al2O3) carrier in gas composition similar to the gas after biomass pyrolysis. The optimal concentration of nickel was identified to be 10% by weight on Al2O3. It was stable in all studied initial toluene concentrations, discharge power while C7H8 conversion rate remained high – up to 82%. During the process, nickel catalysts were deactivated by sooth formation on the surface. On catalysts surface, toluene decomposition products were identified including benzyl alcohol and 3-hexen-2-one.

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Purification of the gas after pyrolysis in coupled plasma-catalytic system

Polish Journal of Chemical Technology ◽

10.1515/pjct-2017-0073 ◽

2017 ◽

Vol 19 (4) ◽

pp. 94-98 ◽

Cited By ~ 5

Author(s):

Michał Młotek ◽

Bogdan Ulejczyk ◽

Joanna Woroszył ◽

Irmina Walerczak ◽

Krzysztof Krawczyk

Keyword(s):

Catalytic System ◽

Flow Rate ◽

Gas Flow ◽

Homogeneous System ◽

Discharge Power ◽

Gas Composition ◽

Gas Flow Rate ◽

Gliding Discharge ◽

The One ◽

Pyrolysis Of Biomass

Abstract Gliding discharge and coupled plasma-catalytic system were used for toluene conversion in a gas composition such as the one obtained during pyrolysis of biomass. The chosen catalyst was G-0117, which is an industrial catalyst for methane conversion manufactured by INS Pulawy (Poland). The effects of discharge power, initial concentration of toluene, gas flow rate and the presence of the bed of the G-0117 catalyst on the conversion of C7H8, a model tars compounds were investigated. Conversion of coluene increases with discharge power and the highest one was noted in the coupled plasma-catalytic system. It was higher than that in the homogeneous system of gliding discharge. When applying a reactor with reduced G-0117 and CO (0.15 mol%), CO2 (0.15 mol%), H2 (0.30 mol%), N2 (0.40 mol%), 4000 ppm of toluene and gas flow rate of 1.5 Nm3/h, the conversion of toluene was higher than 99%. In the coupled plasma-catalytic system with G-0117 methanation of carbon oxides was observed.

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Catalyst Selection for Hydrogenation of 1,2-Dihydroacenaphthylene

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19981945 ◽

1998 ◽

Vol 63 (11) ◽

pp. 1945-1953 ◽

Cited By ~ 2

Author(s):

Jiří Hanika ◽

Karel Sporka ◽

Petr Macoun ◽

Vladimír Kysilka

Keyword(s):

Activation Energy ◽

Nickel Catalyst ◽

Palladium Catalyst ◽

Active Component ◽

Reaction Order ◽

Nickel Catalysts ◽

Practical Application ◽

Repeated Use ◽

Selection For ◽

Catalyst Selection

The activity of ruthenium, palladium, and nickel catalysts for the hydrogenation of 1,2-dihydroacenaphthylene in cyclohexane solution was studied at temperatures up to 180 °C and pressures up to 8 MPa. The GC-MS technique was used to identify most of the perhydroacenaphthylene stereoisomers, whose fractions in the product were found dependent on the nature of the active component of the catalyst. The hydrogenation was fastest on the palladium catalyst (3% Pd/C). The nickel catalyst Ni-NiO/Al2O3, which is sufficiently active also after repeated use, can be recommended for practical application. The activation energy of 1,2-dihydroacenaphthylene hydrogenation using this catalyst is 17 kJ/mol, the reaction order with respect to hydrogen is unity.

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Progressing arthrosis and a high conversion rate 11 (4–19) years after four corner fusion

Journal of Plastic Surgery and Hand Surgery ◽

10.1080/2000656x.2021.1898970 ◽

2021 ◽

pp. 1-7

Author(s):

Ole Reigstad ◽

Trygve Holm-Glad ◽

Preben Dovland ◽

Johanne Korslund ◽

Christian Grimsgaard ◽

...

Keyword(s):

Conversion Rate ◽

High Conversion ◽

High Conversion Rate

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Formation of conjugated double bonds in soybean oil with iodine as a catalyst

Journal of the Serbian Chemical Society ◽

10.2298/jsc150504082y ◽

2016 ◽

Vol 81 (2) ◽

pp. 141-151 ◽

Cited By ~ 3

Author(s):

Jie Yan ◽

Jinlan Yang ◽

Rifu Yang ◽

Haifen He ◽

Qihai Liu ◽

...

Keyword(s):

Linoleic Acid ◽

Reaction Time ◽

Soybean Oil ◽

Linolenic Acid ◽

Conversion Rate ◽

Raw Material ◽

Catalyst Loading ◽

Optimal Conditions ◽

Trans Isomers ◽

High Conversion Rate

A method for the iodine-catalyzed conjugation of soybean oil was developed, and the conjugated product was analyzed by UV, IR, and 1H NMR. The results indicated that the optimal conditions for conjugation included a temperature of 180?C, a catalyst loading of 0.5 wt.% and a reaction time of 3 h, at which the concentration of conjugated linoleic acid was 1.51 mol L-1, with 92 % conversion, the CLNA reached 0.225 mol L-1 when the temperature was 130?C, a catalyst loading of 0.5 wt.%, and a reaction time of 3 h with a conversion rate of 99.9 %. The reaction predominantly produced trans-trans, trans-cis and cis-trans isomers. It was also revealed that the conjugation of linolenic acid was much faster than that of linoleic acid. The method possessed the advantages of a short procedure, a high conversion rate, and no methyl esterification of the raw material, and it was an environmentally friendly technology that does not use solvents.

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The Surface of Copper-Nickel Catalyst. II. Adsorption of Hydrogen on Copper, Nickel, and Copper-Nickel Catalysts

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.30.182 ◽

1957 ◽

Vol 30 (2) ◽

pp. 182-186 ◽

Cited By ~ 3

Author(s):

Toyosaburo Takeuchi ◽

Masakazu Sakaguchi

Keyword(s):

Nickel Catalyst ◽

Nickel Catalysts ◽

Copper Nickel ◽

Adsorption Of Hydrogen

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Elastomeric polyethylenes accessible via ethylene homo-polymerization using an unsymmetrical α-diimino-nickel catalyst

Polymer Chemistry ◽

10.1039/c7py00434f ◽

2017 ◽

Vol 8 (18) ◽

pp. 2785-2795 ◽

Cited By ~ 45

Author(s):

Xinxin Wang ◽

Linlin Fan ◽

Yanping Ma ◽

Cun-Yue Guo ◽

Gregory A. Solan ◽

...

Keyword(s):

Thermal Stability ◽

Nickel Catalyst ◽

Elastic Recovery ◽

Nickel Catalysts ◽

High Thermal Stability ◽

Elongation At Break ◽

New Family ◽

High Elongation

Elastomeric polyethylenes, with good elastic recovery and high elongation at break, have been prepared using a new family of unsymmetrical α-diimino-nickel catalysts that display high activities and high thermal stability.

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Coupled Plasma-Catalytic System with Rang 19pr Catalyst for Conversion of Tar

Scientific Reports ◽

10.1038/s41598-019-49959-4 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 4

Author(s):

Michał Młotek ◽

Joanna Woroszył ◽

Bogdan Ulejczyk ◽

Krzysztof Krawczyk

Keyword(s):

Catalytic System ◽

Gas Flow ◽

Model Compound ◽

Calorific Value ◽

Homogeneous System ◽

Toluene Concentration ◽

Gliding Discharge ◽

Outlet Stream ◽

The One ◽

Pyrolysis Of Biomass

Abstract A coupled plasma-catalytic system (CPCS) for the conversion of toluene was investigated and compared to the homogeneous system of gliding discharge plasma. Toluene was used as a model compound, which is present in tars. The study was carried out at atmospheric pressure, in a gas composition similar to the one obtained during pyrolysis of biomass. The effect of the initial toluene concentration, energy supplied to gliding discharge (GD) and the presence of a catalyst on the conversion of toluene was studied. Both the composition of outlet gas and its calorific value were monitored. Based on the obtained results it can be concluded that the conversion of toluene increases with the increase of gliding discharge power. The highest toluene conversion (89%) was received in the coupled plasma-catalytic system (catalyst: RANG-19PR) under the following conditions: CO (0.13 mol. fr.), CO2 (0.12 mol. fr.), H2 (0.25 mol. fr.), N2 (0.50 mol. fr.) and 4400 ppm of toluene with a gas flow rate of 1000 Nl/h. The composition of the outlet gas in the homogeneous system and in the CPCS changed in the range of a few percents. Toluene levels were reduced tenfold. Benzene, C3 and C4 hydrocarbons, as well as acetylene, ethylene and ethane, were detected in the outlet stream in trace amounts. Carbon deposits were present in the reactor. The products of methanation of carbon oxides were detected in the both studied systems. A mechanism of toluene decomposition in the CPCS was proposed. The application of the catalyst brought about an increase in the calorific value of the outlet gas. It was above the minimal level demanded by engines and turbines.

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A neutral Cu-based MOF for effective quercetin extraction and conversion from natural onion juice

RSC Advances ◽

10.1039/c9ra04551a ◽

2019 ◽

Vol 9 (58) ◽

pp. 33716-33721

Author(s):

Rui-Qi Xiang ◽

Yan-Fei Niu ◽

Jie Han ◽

Yat-Long Lau ◽

Hai-Hong Wu ◽

...

Keyword(s):

Natural Product ◽

Conversion Rate ◽

Metal Organic Framework ◽

High Conversion ◽

High Conversion Rate ◽

Metal Organic ◽

Neutral Metal ◽

Organic Framework

A new neutral metal–organic framework can efficiently extract natural product quercetin (QT) from fresh QT-rich onion juice and rapidly convert it into Cu–QT with a relatively high conversion rate.

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Easy Method for the Transformation of Levulinic Acid into Gamma-Valerolactone Using a Nickel Catalyst Derived from Nanocasted Nickel Oxide

Materials ◽

10.3390/ma12182918 ◽

2019 ◽

Vol 12 (18) ◽

pp. 2918 ◽

Cited By ~ 3

Author(s):

Sanchis ◽

García ◽

Dejoz ◽

Vázquez ◽

Llopis ◽

...

Keyword(s):

High Temperature ◽

Nickel Oxide ◽

Hydrothermal Method ◽

Nickel Catalyst ◽

Levulinic Acid ◽

Nickel Catalysts ◽

Metallic Nickel ◽

Easy Method ◽

High Temperature Water ◽

Temperature Water

Different nickel catalysts have been tested for the transformation of levulinic acid into γ-valerolactone using an easy hydrothermal method, taking advantage of the properties of the high temperature water. A metallic nickel catalyst derived from NiO synthesized by a nanocasting procedure can achieve a productivity to γ-valerolactone, which is two orders of magnitude higher than that obtained by a commercial nickel catalyst. This nanocasted metallic nickel catalyst has shown bifunctionality as it is capable of activating water as the source for hydrogen and undertaking the further hydrogenation step. In contrast with metallic nickel, nickel oxide has shown to be incapable of transforming levulinic acid into γ-valerolactone.

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