Investigation of a Co-MgO-ZSM catalyst by temperature-programmed reduction, temperature-programmed desorption, and IR spectroscopy

1992 ◽  
Vol 41 (1) ◽  
pp. 41-45
Author(s):  
A. Yu. Krylova ◽  
A. L. Lapidus ◽  
S. D. Sominskii ◽  
L. F. Rar ◽  
A. Zukal ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Temperature Programmed Desorption ◽  
Reduction Temperature ◽  
Temperature Programmed Reduction ◽  
Temperature Programmed

scholarly journals Novel Nickel- and Magnesium-Modified Cenospheres as Catalysts for Dry Reforming of Methane at Moderate Temperatures

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1066 ◽  
Author(s):  
Bogdan Samojeden ◽  
Marta Kamienowska ◽  
Armando Izquierdo Colorado ◽  
Maria Elena Galvez ◽  
Ilona Kolebuk ◽  
...  
Keyword(s):  
Supported Catalysts ◽  
Temperature Programmed Desorption ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Temperature Programmed Reduction ◽  
Fly Ashes ◽  
Coal Fly Ashes ◽  
Temperature Programmed ◽  
Mg Content

Cenospheres from coal fly ashes were used as support in the preparation of Ni–Mg catalysts for dry reforming of methane. These materials were characterized by means of XRD, H2-temperature-programmed reduction (H2-TPR), CO2-temperature-programmed desorption (CO2-TPD), and low-temperature nitrogen sorption techniques. The cenosphere-supported catalysts showed relatively high activity and good stability in the dry reforming of methane (DRM) at 700 °C. The catalytic performance of modified cenospheres was found to depend on both Ni and Mg content. The highest activity at 750 °C and 1 atm was observed for the catalyst containing 30 wt % Mg and 10, 20, and 30 wt % Ni, yielding to CO2 and CH4 conversions of around 95%.

Effect of Heteroatom on Properties of SiO2-Supported Heteropolymolybdates

1998 ◽  
Vol 63 (11) ◽  
pp. 1927-1937 ◽  
Author(s):  
Alla Spojakina ◽  
Nina Kostova ◽  
Květa Jirátová
Keyword(s):  
Ir Spectroscopy ◽  
Lithium Salts ◽  
Temperature Programmed Reduction ◽  
Thiophene Conversion ◽  
Keggin Anions ◽  
Temperature Programmed

SiO2-supported trihydrogen phosphododecamolybdate acid H3PMo12O40 (denoted as H3PMo) and tetrahydrogen silicododecamolybdate acid H4SiMo12O40 (denoted as H4SiMo) and their lithium salts have been studied using IR spectroscopy, temperature programmed reduction and measurement of the thiophene conversion. Lacunar anions of H3PMo and, under some conditions, of H4SiMo are formed if lithium is present in the catalyst. Unlike the supported hetero polyacids, lithium combined with the analogues of defect Keggin anions formed during calcination enhances hydrodesulfurization of thiophene.

scholarly journals Ru-Promoted Ni/Al2O3 Fluidized Catalyst for Biomass Gasification

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 316 ◽  
Author(s):  
Alan Rubén Calzada Hernandez ◽  
Daniel Gibran González Castañeda ◽  
Adriana Sánchez Enriquez ◽  
Hugo de Lasa ◽  
Benito Serrano Rosales
Keyword(s):  
Acid Site ◽  
Biomass Gasification ◽  
Temperature Programmed Desorption ◽  
Steam Gasification ◽  
Bet Surface Area ◽  
Temperature Programmed Reduction ◽  
N2 Adsorption ◽  
Site Density ◽  
Temperature Programmed ◽  
Adsorption Desorption

Fluidizable catalysts based on Ni/Al2O3 with added Ru were used for the gasification of a lignin surrogate (2-methoxy-4-methylphenol) in a fluidized CREC Riser Simulator reactor. This was done in order to quantify lignin surrogate conversion and lignin surrogate products (H2, CO, CO2 and CH4) as well as the coke deposited on the catalyst. The catalysts that were evaluated contained 5% wt. Ni with various Ru loadings (0.25%, 0.5% and 1% wt). These catalysts were synthesized using an incipient Ni and Ru co-impregnation. Catalysts were characterized using XRD, N2 adsorption-desorption (BET Surface Area, BJH), Temperature Programmed Reduction (TPR), Temperature Programmed Desorption (TPD) and H2 chemisorption. Catalytic steam gasification took place at 550, 600 and 650 °C using 0.5, 1.0 and 1.5, steam/biomass ratios. The results obtained showed that Ru addition helped to decrease both nickel crystallite site sizes and catalyst acid site density. Moreover, it was observed that coke on the catalyst was reduced by 60%. This was the case when compared to the runs with the Ni/Al2O3 free of Ru.

scholarly journals Composition of extraction products from alkylated high-sulphur coals

2003 ◽  
Vol 1 (4) ◽  
pp. 366-386 ◽  
Author(s):  
Mieczysław Kozłowski ◽  
Helena Wachowska ◽  
Jan Yperman
Keyword(s):  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Atmospheric Pressure ◽  
Liquid Ammonia ◽  
Temperature Programmed Reduction ◽  
Reductive Methylation ◽  
Aliphatic Compounds ◽  
Low Degree ◽  
Temperature Programmed ◽  
Degree Of Condensation

AbstractProducts of reductive and non-reductive methylation of two high-sulphur coals (Mequinenza and Illinois No. 6) have been extracted by dichloromethane. It has been established that the efficiency of the transformation of coal to the products soluble in CH2Cl2 is higher for coals subjected to non-reductive methylation by the Liotta method than for those after reduction in the potassium/liquid ammonia system. The extracts and the extraction residues were subjected to elemental analysis, IR spectroscopy, and AP-TPR (Atmospheric Pressure-Temperature Programmed Reduction) measurements. It has been shown that the main species undergoing extraction by CH2Cl2 are aliphatic compounds or aromatic structures of low degree of condensation. The effect of the extraction on the sulphur groups in coal has been discussed.

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