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Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.


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Patent
01 Jun 1982
TL;DR: A hydrogenation catalyst for desulfurization and removal of heavy metals, which comprises at least one metal component selected from metals of Groups VI B and VIII of the Periodic Table, as a catalytically active component, and (2) a porous activated alumina carrier obtained by shaping a mixture of carbon black and a powder of activated aluminina or a precursor of activated aluminium, drying the shaped mixture and firing it in an oxygen-containing gas stream to burn off the carbon black.
Abstract: A hydrogenation catalyst for desulfurization and removal of heavy metals, comprises (a) at least one metal component selected from metals of Groups VI B and VIII of the Periodic Table, as a catalytically active component, and (2) a porous activated alumina carrier obtained by shaping a mixture of carbon black and a powder of activated alumina or a precursor of activated alumina, drying the shaped mixture and firing it in an oxygen-containing gas stream to burn off the carbon black.

51 citations

Journal ArticleDOI
TL;DR: In this article, a simple and efficient method was used for the preparation of magnetic Fe3(Mn2+)O4 (M:Fe and/or Mn) activated carbons, which were impregnated with magnetic precursor solutions and then calcinated at 400 °C.
Abstract: The presence of arsenic in water supplies is a major problem for public health and still concerns large parts of population in Southeast Asia, Latin America and Europe Removal of arsenic is usually accomplished either by coagulation with iron salts or by adsorption with iron oxides or activated alumina However, these materials, although very efficient for arsenic, normally do not remove other undesirable constituents from waters, such as chlorine and organo-chlorine compounds, which are the results of water chlorination Activated carbon has this affinity for organic compounds, but does not remove arsenic efficiently Therefore, in the present study, iron modified activated carbons are investigated as alternative sorbents for the removal of arsenic(V) from aqueous solutions In addition, modified activated carbons with magnetic properties can easily be separated from the solutions In the present study, a simple and efficient method was used for the preparation of magnetic Fe3(Mn2+)O4 (M:Fe and/or Mn) activated carbons Activated carbons were impregnated with magnetic precursor solutions and then calcinated at 400 °C The obtained carbons were characterized by X-ray diffraction (XRD), nitrogen adsorption isotherms, scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), Fourier Transform Infrared Spectrometry (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements Their adsorption performance for As(V) was evaluated The iron impregnation presented an increase in As(V) maximum adsorption capacity (Qmax) from about 4 mg g−1 for the raw carbon to 1105 mg g−1, while Mn incorporation further increased the adsorption capacity at 1935 mg g−1

51 citations

Journal ArticleDOI
TL;DR: The Toxicity Characteristic Leaching Procedure (TCLP) leachability tests indicated that the spent ZFA and alumina-modified ZFA complied with the EPA regulations for safe disposal.

50 citations

Patent
17 Jun 1983
TL;DR: In this paper, a catalyst for use in the hydrotreatment of hydrocarbons comprises a carrier and at least one catalytic metal selected from vanadium, molybdenum, tungsten, nickel, cobalt and/or iron; this catalyst is in the form of a plurality of juxtaposed agglomerates of acicular platelets oriented radially to each other.
Abstract: A catalyst for use in the hydrotreatment of hydrocarbons comprises a carrier and at least one catalytic metal selected from vanadium, molybdenum, tungsten, nickel, cobalt and/or iron; this catalyst is in the form of a plurality of juxtaposed agglomerates of acicular platelets, oriented radially to each other. It is prepared from agglomerates of activated alumina subjected to reaction with an acid and a compound providing an anion able to combine with aluminum ions in solution.

50 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined arsenic sorption to amorphous and granular media oxides at various levels of silica, calcium and pH, and closely monitored the progress of sorption in these systems.
Abstract: Arsenic can be effectively removed from water by sorption to amorphous or granular iron or aluminum oxides. however, silica is known to interfere with arsenic sorption at pH >7.5. The goal of this work was to examine arsenic sorption to amorphous and granular media oxides at various levels of silica, calcium and pH, and to closely monitor the progress of sorption in these systems. At pH 8.5, calcium dramatically increased arsenic sorption to amorphous iron hydroxide in the presence of silica over relatively short reaction times, but the effects gradually disappeared over longer reaction times. Additionally, batch tests indicated that activated alumina granular media was more sensitive to silica interference than granular ferric hydroxide. However, relatively low levels of calcium could reduce silica interference to arsenic sorption onto activated alumina. While future confirmation research is needed, severe silica interference can occur in practice due to exclusion of arsenate from interstitial granular media pores.

50 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202218
202118
202031
201941
201839