The bonding of heavy metals on nitric acid-etched coal fly ashes functionalized with 2-mercaptoethanol or thioglycolic acid

2014 ◽  
Vol 143 (3) ◽  
pp. 1469-1480 ◽  
Author(s):  
M.I. Muñoz ◽  
A.J. Aller ◽  
D. Littlejohn
Keyword(s):  
Heavy Metals ◽  
Nitric Acid ◽  
Thioglycolic Acid ◽  
Fly Ashes ◽  
Coal Fly Ashes

Heavy metals in MSW incineration fly ashes

2003 ◽  
Vol 107 ◽  
pp. 463-466 ◽  
Author(s):  
C. Ferreira ◽  
A. Ribeiro ◽  
L. Ottosen
Keyword(s):  
Heavy Metals ◽  
Fly Ashes ◽  
Msw Incineration

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%.

Optimization of hydrothermal synthesis of pure phase zeolite Na-P1 from South African coal fly ashes

2012 ◽  
Vol 47 (3) ◽  
pp. 337-350 ◽  
Author(s):  
Nicholas M. Musyoka ◽  
Leslie F. Petrik ◽  
Wilson M. Gitari ◽  
Gillian Balfour ◽  
Eric Hums
Keyword(s):  
Hydrothermal Synthesis ◽  
South African ◽  
Fly Ashes ◽  
Pure Phase ◽  
Coal Fly Ashes

Environmental evaluation and nano-mineralogical study of fresh and unsaturated weathered coal fly ashes

2019 ◽  
Vol 663 ◽  
pp. 177-188 ◽  
Author(s):  
Segun A. Akinyemi ◽  
Wilson M. Gitari ◽  
Leslie F. Petrik ◽  
Bemgba B. Nyakuma ◽  
James C. Hower ◽  
...  
Keyword(s):  
Fly Ashes ◽  
Environmental Evaluation ◽  
Weathered Coal ◽  
Mineralogical Study ◽  
Coal Fly Ashes

scholarly journals Geochemical fractionation of hazardous elements in fresh and drilled weathered South African coal fly ashes

2020 ◽  
Vol 42 (9) ◽  
pp. 2771-2788 ◽  
Author(s):  
S. A. Akinyemi ◽  
W. M. Gitari ◽  
R. Thobakgale ◽  
L. F. Petrik ◽  
B. B. Nyakuma ◽  
...  
Keyword(s):  
South African ◽  
Fly Ashes ◽  
Geochemical Fractionation ◽  
Hazardous Elements ◽  
Coal Fly Ashes

Recovery of Heavy Metals from the Spent Catalyst of the Hydrotreating Unit (HDT) for the Use of the Impregnation of Supported Catalysts

2018 ◽  
Vol 792 ◽  
pp. 133-139 ◽  
Author(s):  
Toapanta Germania ◽  
Caterine Donoso ◽  
María José Cárdenas ◽  
Amón Bolívar ◽  
Vladimir Ortiz
Keyword(s):  
Heavy Metals ◽  
Nitric Acid ◽  
Acid Concentration ◽  
Supported Catalysts ◽  
Nitric Acid Concentration ◽  
Added Value ◽  
High Tech ◽  
Spent Catalyst ◽  
X Ray ◽  
Spent Catalysts

Spent catalysts contain metals that have a high added value. From all metals, lanthanum has attracted a lot of attention due to the growing demand in the high-tech. The spent catalyst of the hydrotreatment unit is a material composed of lanthanum-enriched matrix of amorphous aluminosilicates. The experiment was carried out with a spent catalyst with a constant particle size of 90 μm. The treatments were obtained applying of two level factorial design to investigate the effect of following factors: temperature (20 - 60 °C), nitric acid concentration (3 - 6 M), leaching time (1 - 4 h) and percent solids (10 - 20 %). The research is carried out in two steps process: pretreatment of the catalyst and leaching with nitric acid. The leaching results show a yield of lanthanum of 99.44% using the following conditions: temperature (20 °C), nitric acid concentration (3M), leaching time (1 h), percent solids (20%) and 300 rpm. The principal analysis of the spent catalyst was carried out using the X-Ray Fluorescence (XRF) technique, 3.08%, while the percentage of lanthanum recovery in the extract, washing and refining was carried out using the Inductive Coupling Plasma (ICP) technique.

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