Catalyst Support Articles on Environmental XPRT

Dirt, The Ultimate Catalyst

AbstractA catalyst is a substance which alters the rate of a chemical reaction but is not consumed in the reaction. In earlier days of chemical processing, catalysts used to promote commercial chemical processes were most often made of inordinately expensive Aprecious metals such as platinum or rhodium. Over the last decade or so, Abase metal catalysts such as manganese oxide and copper ...

Jan. 1, 2001

Global harmonization — A catalyst for safety

The majority of employers in the United States would not argue the point that the Hazard Communication Standard (HCS) has cost their company an incredible amount of time, money, and grief since its inception. Though it is a great concept, I question whether the HCS, even after more than 20 years in existence, has produced more than a few positive results in the eyes of most employers and ...

May 1, 2010

By MAXCOM - a division of Haas Group International, Inc.

Photo-degradation of butyl parahydroxybenzoate by using TiO<sub>2</sub>-supported catalyst

Photo-degradation of butyl parahydroxybenzoate by using TiO₂-supported catalyst

The present work evaluates the potential of the photocatalysis (PC) process for the degradation of butylparaben (BPB). Relatively high treatment efficiency was achieved by comparison to photochemical process. Prior to photocatalytic degradation, adsorption (AD) of BPB occurred on the titanium dioxide (TiO2)-supported catalyst. AD was described by Langmuir isotherm (KL ...

May 16, 2013

By IWA Publishing

Preventing maritime transport of pathogens: the remarkable antimicrobial properties of silver-supported catalysts for ship ballast water disinfection

Ship ballast water (SBW) antimicrobial treatment is considered as a priority issue for the shipping industry. The present work investigates the possibility of utilizing antimicrobial catalysis as an effective method for the treatment of SBW. Taking into account the well-known antimicrobial properties of ionic silver (Ag+), five silver-supported catalysts ...

May 5, 2017

By IWA Publishing

Gold nano–particles supported on hematite and magnetite as highly selective catalysts for the hydrogenation of nitro–aromatics

The catalytic action of nano–sized Au particles supported on hematite (Fe2O3) and magnetite (Fe3O4) is compared in the continuous gas phase hydrogenation of p–chloronitrobenzene and ...

Jan. 10, 2012

By Inderscience Publishers

Enhanced electrochemical oxidation of Acid Red 3R wastewater with iron phosphomolybdate supported catalyst

Electrochemical oxidation of Acid Red 3R (AR3R) was investigated with the new catalyst of iron phosphomolybdate (FePMo12) supported on modified molecular sieves type 4 Å (4A) as packing materials in the reactor. The results of the Fourier transform infrared spectroscopy and X-ray diffraction indicated that the heteropolyanion had a Keggin structure. The optimal conditions for ...

Mar. 27, 2015

By IWA Publishing

A study on physico–chemical properties and activity of Co–based catalysts supported on SBA–15 in the Fischer–Tropsch synthesis

Cobalt catalysts supported on SBA–15 and SBA–15, modified by trimethylbenzene (TMB) were prepared from cobalt nitrate and cobalt acetate. Physico–chemical characteristics and activity of the obtained catalysts in Fischer–Tropsch Synthesis at 0.7 MPa were investigated. The results indicate that the use of TMB led to a widening the pores of SBA–15, improving the dispersity of cobalt oxide particles ...

Apr. 8, 2013

By Inderscience Publishers

The effect of several parameters on catalytic denitrification of water by the use of H<sub>2</sub> in the presence of O<sub>2</sub> over metal supported catalysts

The effect of several parameters on catalytic denitrification of water by the use of H₂ in the presence of O₂ over metal supported catalysts

The present paper involves a detailed study of the selective catalytic reduction of nitrates in aqueous mediums by the use of H2 in the presence of O2 over monometallic and bimetallic supported catalysts. In this study, an attempt has been made to improve the denitrification efficiency (XNO3−, SN2) of ...

Nov. 29, 2013

By IWA Publishing

Photocatalytic degradation of rhodamine B, paracetamol and diclofenac sodium by supported titania-based catalysts from petrochemical residue: effect of doping with magnesium

Three different lots of a residual Ziegler-Natta catalyst slurry (bearing Ti and Mg) obtained from an industrial petrochemical plant were employed as sources for the photocatalyst supported on silica. The effect of additional magnesium (1.0–25.0 wt% Mg/SiO2) on the photocatalytic properties of the doped materials was investigated. Doping the titania-based photocatalyst with Mg results in a ...

Sep. 6, 2016

By IWA Publishing

Effect of support and second metal in catalytic <italic>in-situ</italic> generation of hydrogen peroxide by Pd-supported catalysts: application in the removal of organic pollutants by means of the Fenton process

Effect of support and second metal in catalytic in-situ generation of hydrogen peroxide by Pd-supported catalysts: application in the removal of organic pollutants by means of the Fenton process

A catalytic system for the generation of H2O2 from formic acid and oxygen at ambient conditions has been developed. Pd-supported catalysts (Pd/C, Pd/TiO2 and Pd/Al2O3) have been tested, showing that for bulk purposes Pd/Al2O3 is more favourable while for in-situ applications Pd/TiO2 seems to be preferable. However, when these catalysts were tested in the in-situ H2O2 generation ...

Jan. 1, 2011

By IWA Publishing

Activities of different metal oxide catalysts on NO reduction and CO oxidation

A series of transition metal oxide catalysts (Zn, Ti, Cu, Ni, Fe and V) supported on Al2O3 and SiO2 were prepared using the incipient wetness impregnation method. Their performances on NO reduction and CO oxidation followed the sequence of TiO2 > CuO/ZnO > CuO > ZnO. TiO2 supported on SiO2 was more active than that on Al2O3, while ZnO had the opposite performances. The activities of CuO/Al2O3 and ...

Apr. 8, 2009

By Inderscience Publishers

Recovery of nickel from spent catalyst by single- and multi-stage leaching process

Nickel-supported catalyst is used in petroleum, fertiliser and iron industries. This research studied the possibility of recovering nickel by leaching the ground catalyst with sulphuric acid. The leaching was done in single stage and multi-stages. The results obtained in single-stage leaching showed that the percentage recovery of nickel increased with increasing acid concentration used up to 25% ...

Dec. 9, 2008

By Inderscience Publishers

Oxidation of cosmetic wastewaters with H2O2 using a Fe/γ-Al2O3 catalyst

A catalyst based on Fe supported on γ-Al2O3 has been prepared and tested for catalytic wet peroxide oxidation (CWPO) of cosmetic wastewaters. The influence of the main operating conditions (space-time, temperature, and H2O2 dose) have been investigated. Working with this self-made Fe/γ-Al2O3 catalyst at 85°C, with a space-time of 9.4 kgcat h/kgCOD and a dose of H2O2, corresponding to 0.5 times ...

Mar. 1, 2010

By IWA Publishing

Recovery of Precious Metal Catalysts - A New Process Using Supercritical Water Oxidation

Up to now, the recovery of precious metals used as catalysts in chemical processes has involved the use of incineration. Now, however, a British-Swedish joint venture has developed a process which uses supercritical water oxidation instead, which provides many economic and environmental advantages. Precious metals are used extensively in catalysts in a wide range of industrial chemical processes. ...

Jan. 1, 2002

By Johnson Matthey Emission Control Technologies

Recovery of Ruthenium and Other PGMs from Spent Petrochemical Catalysts - Case Study

The recovery of platinum group metals from spent petrochemical catalysts has economic benefits by the protection of the supply chain of these valuable and rare metals, thereby helping to create a sustainable value chain in the petrochemical industry for catalysts. Introduction The platinum group metals (PGMs) are used extensively in catalysts for the petrochemical industry owing to ...

Jan. 1, 2016

By Tetronics (International) Limited

The effect of immobilized catalyst structure on the degradation of chemical and biological contaminants in simulated solar photocatalytic water purification

The performance of different configurations of titanium dioxide-coated foam supports as photocatalysts in an enhanced solar disinfection system for drinking water treatment was evaluated, using the reduction of methylene blue, 1-4-dioxane, and Escherichia coli as performance indicators. Reactors with immobilized catalysts were able to match or surpass the performance of a suspension ...

Jul. 10, 2015

By IWA Publishing

In-situ investigation of the cathode catalysts for PEM fuel cells using differential electrochemical mass spectrometry

Differential electrochemical mass spectrometry (DEMS) involves applying a potential across an electrochemical cell and measuring the resulting current while concurrently analyzing gas products with a mass spectrometer. We used DEMS to investigate the mechanism of carbon support corrosion (CSC) in-situ at the cathode of proton exchange membrane fuel cell (PEMFC). The cathode exhaust gases were ...

Mar. 12, 2012

By Hiden Analytical Ltd.

Development of a microfuel processor: oxidative steam reforming of ethanol and water-gas shift reaction on noble metal catalysts in a microreactor

The oxidative steam reforming of ethanol (OSRE) and water-gas shift (WGS) reactions were studied in a microchannel reactor. For OSRE, the experiments were conducted at atmospheric pressure, with water to ethanol molar ratio of 3 or 6 and oxygen to ethanol molar ratio ranging from 0.5 to 1.5, over a temperature range of 350–550°C on Rh/CeO 2 /γ-Al 2 O 3 catalysts. Compared to ...

Dec. 2, 2013

By Inderscience Publishers

A comparative evaluation of palladium and platinum nanoparticles as catalysts in proton exchange membrane electrochemical cells

The goal of the present study is the development and comparative characterisation of carbon-supported and nanostructured Pd- and Pt-based electrocatalysts for hydrogen oxidation in Proton Exchange Membrane (PEM) H2/O2(air) fuel cells and proton reduction in PEM water electrolysers. Catalysts have been synthesised in a solution using a combined impregnation/reduction polyol method. They have been ...

Feb. 10, 2009

By Inderscience Publishers

Low temperature steam reforming of bio-ethanol over Ni%CuO-2O3 catalysts

Various loadings of Ni (5-20wt%) supported on CuO-Al2O3 mixed oxide catalysts has been explored for the low temperature steam reforming of bio-ethanol. It has been found that 10wt%Ni/CuO-Al2O3 catalyst showed relatively high ethanol conversion as well as selectivity towards H2 (∼74%) compared to other catalysts. The better performance of the 10wt%Ni/CuO-Al2O3 is explained based on the ...

Aug. 18, 2010

By Inderscience Publishers

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