Selective Catalytic Reduction Catalyst Articles on Environmental XPRT

Selective catalytic reduction of nitric oxide over copper oxide and cerium oxide catalysts

The selective catalytic reduction of nitric oxide with hydrocarbons in an oxygen-containing simulated flue gas has been investigated for a series of copper oxide and cerium oxide alumina supported catalysts at 600–775 K. The activity of these catalysts for the reduction of NO by methane or propane has been investigated in simulated flue gas. The effects of sulphates on the catalyst, and of water ...

Jan. 26, 2004

By Inderscience Publishers

The selective catalytic reduction of NO with propane over Ni loaded on H-USY in the presence of excess oxygen

The abatement of NO with propane in the presence of excess oxygen has been investigated on several kinds of commercial USY (Ultra Stable Y zeolite) in the Na-form (Na-USY) and H-form (H-USY) or wet impregnated to various extents with Ni ions (Ni/USY) catalysts. Experimental results indicated that Ni/H-USY loaded with 15% Ni showed comparatively better catalytic activity for Selective Catalytic ...

Dec. 9, 2008

By Inderscience Publishers

A selective catalytic system for greenhouse gas (NOx) emission reduction at a 2–ethyl hexanol plant

Trends of ambient NOX levels in the Jubail Industrial City, Saudi Arabia, are increasing, and the regulators have identified areas requiring substantial reductions to control the atmospheric NOX concentrations. In this study, a Selective Catalytic Reduction (SCR) system for the control of NOX ...

Jul. 26, 2012

By Inderscience Publishers

Catalytic reduction of nitrate in secondary effluent of wastewater treatment plants by Fe0 and Pd–Cu/γ–Al2O3

Total nitrogen, in which NO3− is dominant in the effluent of most wastewater treatment plants, cannot meet the requirements of the Chinese wastewater discharge standard (<15 mg/L), making nitrate (NO3−) elimination attract considerable attention. In this study, reductant iron (Fe0) and γ–Al2O3 supported palladium–copper bimetallic ...

Mar. 7, 2016

By IWA Publishing

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

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

Novel catalytic and mechanistic studies on wastewater denitrification with hydrogen

The present work reports up-to-date information regarding the reaction mechanism of the catalytic hydrogenation of nitrates in water media. In the present mechanistic study, an attempt is made, for the first time, to elucidate the crucial role of several catalysts and reaction parameters in the mechanism of the NO3−/H2 reaction. Steady-state isotopic transient kinetic ...

Feb. 19, 2014

By IWA Publishing

A Predictive Model for Catalytic Converters on Stationary IC Engines

SUMMARY ...

Jan. 1, 2004

By DCL International Inc.

Case study - Styrene emissions: Catalytic oxidizer with concentrator

Overview The world's largest button manufacturer needed a pollution control system that would destroy styrene emissions from a variety of plant processes. The plant was proactively seeking a cost-effective air pollution control solution to preempt future regulatory action. The main concern of the customer was the high operating cost of an emission control system. ...

Jan. 2, 2008

By Anguil Environmental Systems, Inc.

Influence of precursors on the catalytic activity of alumina for bio-ethanol dehydration in microchannel reactors

In this paper, the catalytic activity of alumina for bio-ethanol dehydration was studied in a microchannel reactor. Five catalysts were prepared from precursors with different ratios of AlOOH (pseudo boehmite) and Al(OH)3 (bayerite). The physicochemical properties of catalysts were characterised by X-Ray Diffraction (XRD) and Temperature Programmed Desorption (TPD). The influence of reaction ...

Nov. 11, 2009

By Inderscience Publishers

NOx in Non-Utility Industries - Part II - Control options and monitoring methodology

This the second in a two-part series. Part I, which appeared in our June 2001 issue focuses on air emission origins of nitrogen oxides (NOx) in non-utility industries. Choice of the NOx control technology is dependent on many factors, including regulatory requirements, technical feasibility, cost and public perception. Figure 1, compiled based on publications [1-5], presents a summary of ...

Jan. 1, 2001

Effects of a zeolite SCR system on comprehensive emissions from a heavy-duty diesel engine

The effects of a zeolite urea-selective catalytic reduction (SCR) aftertreatment system on a comprehensive spectrum of chemical species from diesel engine emissions were investigated in this study. Representative samples were collected with a newly developed source dilution sampling system after an aging process designed to simulate atmospheric dilution and cooling conditions. Samples were ...

Oct. 1, 2008

By Air & Waste Management Association (A&WMA)

Staten Island Ferry, Alice Austen, SCR demonstration project case study

In December of 2003, the Port Authority of New York and New Jersey (PANYNJ) undertook a project to retrofit the Staten Island Ferry vessel, Alice Austen, with selective catalytic reduction (SCR) and diesel oxidation catalyst (DOC) exhaust aftertreatment. Alice Austen was selected for the first SCR demonstration project as it is one of ...

Oct. 31, 2013

By M.J. Bradley & Associates LLC

Reaching Euro VI emissions limits

The requirements of low and lowest detectable exhaust analysis has prompted Eco Physics to launch a broad range of analyzers for NO/NOx detection. Emissions tuning is one of the targets of the EURO VI regulations as well as US EPA 2010, which are: Reduction of Particulate Matter (PM) and reduction of Nitrogen Oxides (NOx). In the past 15 years – since the first European regulation for exhaust ...

Nov. 10, 2008

By ECO PHYSICS INC.

Case study: Formaldehyde production

Overiew A major chemical manufacturer required a pollution control system with minimal operational cost to destroy the Hazardous Air Pollutant (HAP) by-products of a formaldehyde production process. A key issue was system reliability; the plant operates 24 hours a day and only shuts down once per year for plant-wide preventive maintenance. ...

Jan. 2, 2008

By Anguil Environmental Systems, Inc.

NOx in Non-Utility Industries - Part I NOx in Non-Utility Industries - Part I - Air emission origins, best control solutions and monitoring methodology for nitrogen oxides

Problems with reducing nitrogen oxides (NOx) are widespread in the general process industries. These industries, together with medium size utility and power generators contribute about 15 percent of global NOx emissions. The emission sources addressed include various heaters employed in chemical and petrochemical plants, nitric and sulfuric acid plants, glass furnaces, iron and steel mills, ...

Jan. 1, 2001

Allweiler pumps in exhaust gas treatment systems in ships

As environmental regulations become more stringent, waste gas treatment systems are growing in importance. H+H Umwelt- und Industrietechnik GmbH of central Germany has been using Allweiler progressing cavity pumps as a core component of these systems since 2003. The company has been manufacturing catalytic waste gas treatment systems since 1998. Originally they focused on applications in block ...

Sep. 9, 2013

By ALLWEILER GmbH

Case study - Paint mixing

Overview A company involved in the automotive aftermarket had a paint batch mixing and filling operation that used primers and fillers. They were faced with installing air pollution control equipment to handle the volatile organic compounds (VOCs) emitted by the solvents used in their processes. An independent consultant had determined that total exhaust volume from the facility was ...

Jan. 2, 2008

By Anguil Environmental Systems, Inc.

Chemical Aspects of NOX Scrubbing

With the passage of the 1990 Clean Air Act Amendments, many chemical and metal industries and utility producers will now be required to further limit the amount of NOX (Nitrogen Oxides) produced. NOX is a precursor to ozone in the atmosphere, and is believed to be a major contributor to acidic deposition (acid rain). Formation of ozone: NO2 + Hv ...

Jan. 1, 2001

Difficult Complex Decisions For Coal-fired Power Plant Operators

Changing fuel prices, government regulations and technology all combine to make decision making difficult for operators and developers of coal-fired power generation facilities around the world. Power plant designers in developing countries face new local environmental regulations plus additional requirements stipulated by lenders such as the World Bank. In the developed world, the regulations ...

Apr. 15, 2015

By The McIlvaine Company

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