scholarly journals A Comparison of the Efficiency of Catalysts Based on Ni, Ni-Co and Ni-Mo in Pressure Pyrolysis of Biomass Leading to Hythane

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1480
Author(s):  
Pavel Straka ◽  
Olga Bičáková ◽  
Tomáš Hlinčík
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Thermal Conversion ◽  
Hydrogen Atmosphere ◽  
Different Types ◽  
Secondary Reactions ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Of Biomass ◽  
Al2o3 Catalyst

A thermal conversion of biomass to hythane using catalysts was studied. Low-temperature pyrolysis of two different types of biomass was performed in a pressure sealed reactor, and the resulting gas with high contents of CO2 and CO was methanized in a hydrogen atmosphere at a pressure of 30 bar. As catalysts, Ni/Al2O3, NiCo/Al2O3 and NiMo/Al2O3 were used and their catalytic activity was evaluated. The NiCo/Al2O3 catalyst showed the highest catalytic activity, Ni/Al2O3 had a lower but comparable one, and NiMo/Al2O3 showed the lowest activity. The resulting hythane contained 70 vol.% CH4 and 10 vol.% H2 (with NiCo/Al2O3 catalyst, HHV 29.20 MJ/m3, LHV 26.32 MJ/m3), or 57 vol.% CH4 and 23 vol% H2 (with Ni/Al2O3, HHV 25.92 MJ/m3, LHV 23.21 MJ/m3) or 47 vol.% CH4 and 27 vol.% H2 (with NiMo/Al2O3, HHV 23.23 MJ/m3, LHV 20.76 MJ/m3). It has been found that secondary reactions of volatile biomass products are of great importance for successful pressure pyrolysis.

scholarly journals Ni-Pd-Al2O3 catalyst supported on reticulated ceramic foam for dry methane reforming

10.30544/133 ◽  
2015 ◽  
Vol 21 (1) ◽  
pp. 57-63
Author(s):  
Vesna Nikolić ◽  
Željko Kamberović ◽  
Marija Korać ◽  
Miroslav Sokić ◽  
Zoran Anđić ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Ceramic Foam ◽  
Methane Reforming ◽  
Salt Solutions ◽  
Metal Chlorides ◽  
Calcination Step ◽  
Α Al2o3 ◽  
Al2o3 Catalyst ◽  
Very Low Temperature

In the present study, Ni-Pd/Al2O3 catalyst supported on α-Al2O3 based foam was prepared and evaluated in the dry methane reforming process. Corresponding metal chlorides were deposited to the foam surface by impregnation of the foam with ultrasonically aerosolized salt solutions at 473 K and drying at that temperature. Calcination step was excluded and the catalyst was reduced at very low temperature – 533 K. The reforming experiment lasted for 3 h, with standing time of 1 h at the following temperatures: 873, 973 and 1023 K. Conclusions on selectivity, catalytic activity and stability were reached on the basis of CO and H2 yields.

scholarly journals Oxygen influence on the process of low-temperature pyrolysis of biomass

2019 ◽  
Vol 1147 ◽  
pp. 012091 ◽  
Author(s):  
A L Shevchenko ◽  
A E Petrov ◽  
G A Sytchev ◽  
V M Zaichenko
Keyword(s):  
Low Temperature ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Of Biomass

Thermal enrichment of different types of biomass by low-temperature pyrolysis

Fuel ◽  
2019 ◽  
Vol 245 ◽  
pp. 29-38 ◽  
Author(s):  
Roman Tabakaev ◽  
Ibraeva Kanipa ◽  
Alexander Astafev ◽  
Yury Dubinin ◽  
Nikolay Yazykov ◽  
...  
Keyword(s):  
Low Temperature ◽  
Different Types ◽  
Low Temperature Pyrolysis

Comparison of the Efficiency of the Reactors for Low-Temperature Pyrolysis of Biomass

2020 ◽  
Vol 67 (5) ◽  
pp. 296-303
Author(s):  
L. B. Direktor ◽  
V. M. Zaichenko ◽  
R. L. Is’emin ◽  
A. A. Chernyavskii ◽  
A. L. Shevchenko
Keyword(s):  
Low Temperature ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Of Biomass

scholarly journals Фотокаталитические свойства композиции alpha-Bi-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-/Bi в видимой области света в зависимости от концентрации металлического висмута и степени дефектности кристаллической решетки оксида висмута

2020 ◽  
Vol 128 (3) ◽  
pp. 327
Author(s):  
Е.А. Кириченко ◽  
О.И. Каминский ◽  
А.В. Зайцев ◽  
К.С. Макаревич ◽  
С.А. Пячин
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Crystal Lattice ◽  
Annealing Temperature ◽  
Isothermal Annealing ◽  
Visible Spectrum ◽  
Metallic Bismuth ◽  
Low Temperature Pyrolysis

The photocatalytic activity of the α-Bi2O3/Bi heterostructure compositions obtained by the method of low-temperature pyrolysis of bismuth-sorbitol complexes was investigated. The effectiveness of catalysts is estimated by the rate of decomposition of methylene blue (MS) upon irradiation with light of the visible spectrum. The catalysts obtained by varying the amount of sorbitol in the composition of the precursor organo-mineral complex of bismuth and by varying the temperature of synthesis, differ in different contents of metallic Bi and have different degrees of defectiveness of the α-Bi2O3 crystal lattice. It is established that isothermal annealing of α Bi2O3/Bi compositions in air in the range of 400–600°C leads to relaxation of defects and an increase in the volume of the α-Bi2O3 crystal lattice. An increase in the annealing temperature to 550°С is accompanied by an increase in the catalytic activity of α-Bi2O3/Bi. However, at higher temperatures, degradation of the heterostructure occurs as a result of the oxidation of metallic bismuth, and the catalytic activity of the composition decreases.

Development and Testing of a Reactor Model for Low-Temperature Pyrolysis of Biomass

2013 ◽  
Vol 49 (7-8) ◽  
pp. 440-442
Author(s):  
R. L. Is’emin ◽  
S. N. Kuz’min ◽  
A. V. Mikhalev ◽  
V. V. Konyakhin ◽  
O. Yu. Milovanov
Keyword(s):  
Low Temperature ◽  
Reactor Model ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Of Biomass

scholarly journals Exploitation Properties of Ni-Pd/Al2O3 Catalyst Supported on Ceramic Foam

10.30544/74 ◽  
2015 ◽  
Vol 21 (4) ◽  
pp. 277-282
Author(s):  
Vesna Nikolić ◽  
Željko Kamberović ◽  
Zoran Anđić ◽  
Marija Korać ◽  
Miroslav Sokić ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Ceramic Foam ◽  
Methane Reforming ◽  
Standing Time ◽  
Α Al2o3 ◽  
Al2o3 Catalyst

The goal of this research was to examine exploitation properties of Ni-Pd/Al2O3 catalyst supported on α-Al2O3 based foam in the dry methane reforming. The catalyst was prepared by using aerosol method. Chloride precursors for Ni and Pd were reduced by hydrogen at low temperature of 533 K, without previous calcination. The reforming experiment was performed for 3 h, with standing time of 1 h for each of the following temperatures: 873, 973 and 1023 K. Conclusions on selectivity, catalytic activity and stability were made on the basis of CO and H2 yields.

Effect of the ionizing radiation on the catalytic activity of the BASF K-3-10 catalyst in the low-temperature conversion of carbon monoxide by water vapour. Catalytic activity of the pre-irradiated catalyst

1986 ◽  
Vol 51 (2) ◽  
pp. 279-287 ◽  
Author(s):  
Alois Motl
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Ionizing Radiation ◽  
Water Vapour ◽  
Effective Activation Energy ◽  
Absorbed Dose ◽  
Beta Radiation ◽  
Fast Neutrons ◽  
Different Types

The catalytic activity of the BASF K-3-10 catalyst with regard to the low-temperature conversion of carbon monoxide by water vapour and its changes after irradiation of the contact area by gamma or beta radiation or by fast neutrons has been investigated. The irradiated samples exhibit a moderately or even substantially higher catalytic activity in comparison with the non-irradiated catalyst, the change being dependent on the absorbed dose; moreover, the effective activation energy of the reaction increases, too. Important differences in the action of different types of the ionizing radiation used have been observed and their probable explanation is offered. In course of these experiments the catalysts were analyzed and the specific surface of the catalyst was measured at various stages of their history. It has been found that at all stages the specific surfaces of the irradiated catalyst are equal to the respective specific surfaces of the non-irradiated contacts.

Hydrolysis of Dimethyl Ether over Heteropoly Acids Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 114-118
Author(s):  
Yong Xiu Li ◽  
Chang Jiang Yu ◽  
Chao Xian Wang ◽  
Longnian Ou ◽  
Yi Bing Song
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Dimethyl Ether ◽  
Phosphotungstic Acid ◽  
Heteropoly Acids ◽  
High Catalytic Activity ◽  
Acid Catalysts ◽  
Different Types ◽  
Super Acid ◽  
Hydrolysis Of

Heteropoly acide(HPA), as one kind of solid-super acid catalysts, has been researched and applied extensively. Using SBA-15 and ZSM-5 as carriers, HPA catalysts with different types and contents were applied in this work for the hydrolysis of dimethyl ether(DME). It had been found that ZSM-5 was a proper carrier, and its supported phosphotungstic acid exhibited relatively high catalytic activity in this low-temperature hydrolysis reaction.

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