Transition metal-promoted silica and alumina catalysts for the selective reduction of nitrogen monoxide with propane

Hamada, Hideaki; Kintaichi, Yoshiaki; Sasaki, Makoto; Ito, Takehiko; Tabata, Mitsunori

doi:10.1016/s0166-9834(00)83117-6

Cited by 216 publications

(77 citation statements)

References 4 publications

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“…The maximum NO reduction rate on these Pt/MCM-41 catalysts were 3.6-4.3 mmol/g ⋅ h at 275 or 250 °C , which was higher than 2.8 mmol/ g ⋅ h obtained on 1% Pt/Al2O3 catalyst [19 ] under similar conditions. Hamada et al [17] reported that the activity for SCR decreased significantly when alumina was replaced by silica as the support for Pt. Pt supported on ZSM-5 also showed SCR activity [ 33 ] .…”

Section: Pt/mcm-41 Catalystmentioning

confidence: 99%

“…A large number of catalysts have been found to be active for these reactions since 1990, such as Cu-ZSM-5 [3][4][5][6], Co-ZSM-5 and Co-Ferrierite [7][8][9], Co/Al2O3 [ 10 ] , Ce-ZSM-5 [11], Cu 2+ -exchanged pillared clay [12,13], Fe-ZSM-5 [ 14 ] , Pt-ZSM-5 [15 ] , Rh-ZSM-5 [16], Pt/Al2O3 [17][18][19], and supported Ag [ 20 ] . Although Cu-ZSM-5 is very active and the most intensively studied catalyst, it suffers from severe deactivation in engine tests, mainly due to H2O and SO2 [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

Long¹,

Yang²

1998

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Section: Pt/mcm-41 Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

Long¹,

Yang²

1998

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“…agents in an oxidative atmosphere are called selective However, the wide use of lean-burn engines is somecatalytic NOx reduction (SCR) catalysts and have been what restricted by environmental regulations, because widely investigated for more than two decades. Wellconventional three-way catalysts cannot fully detoxify known examples include copper ion-exchange zeolites nitrogen oxides (NOx) under excess oxygen conditions, (Cu/ZSM-5) 1)～3) , alumina 4) , base metals supported on although they exhibit excellent catalytic activity for the alumina 5) , and precious metals supported on zeolites 6) . removal of carbon monoxide (CO) and hydrocarbons…”

Section: Introductionmentioning

confidence: 99%

Improvement of Catalysts for NO<sub><i>x</i></sub> Storage and Reduction for Gasoline-fueled Automotive Exhaust

Takahashi

Imagawa

2009

J. Jpn. Petrol. Inst.

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Catalysts for nitrogen oxide (NOx) storage and reduction oxidize nitrogen monoxide (NO) emitted from auto motive lean-burn engines to nitrogen dioxide (NO2) that is then stored on doped NOx storage materials such as barium and/or potassium compounds as nitrate ions (NO3 -). In a reducing atmosphere provided by a suitable engine management system, the nitrates formed are subsequently reduced and decomposed into NOx via reactions between reducing agents in the exhaust gas such as hydrogen, carbon monoxide and hydrocarbons. The emitted NOx is finally reduced and detoxified to nitrogen. To meet stringent emission regulations for automotive exhaust pollutants, NOx storage and reduction catalysts must have excellent NOx removal activity and an extremely long lifetime. These catalysts can deteriorate not only due to thermal stress, but also to sulfur poisoning. Thermal stress causes a decrease in the number of active sites through sintering of precious metals, decreases the specific surface area of the support and leads to solid-phase reaction between the NOx storage material and the support. Sulfur is present in exhaust gas derived from gasoline fuel and it competes with NOx for storage and reacts with the doped NOx storage material to form sulfates. Once NOx storage materials are sulfated, they drastically lose their NOx storage capability. This report reviews the technologies used to overcome these issues and to improve the durability of NOx storage and reduction catalysts against both thermal damage and sulfur poisoning. An advanced novel catalyst system for NOx removal with synergistic NOx storage and reduction with ammonia (NH3) formation, storage and NOx selective reduction by NH3 functions is also described.

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“…CuO-supported catalysts have shown excellent activity for NO x abatement with different reducing agents, such as CO [22], hydrocarbons [23], or ammonia [7]. Based on its unique properties, CuO, especially with nanostructures has widespread applications, such as high-temperature superconductors [24,25], optical switch [18], anode electrodes for batteries [4,26], heterogenous catalysts for several environmental processes [4,22,23,27,28], solid state gas sensor heterocontacts [29,30], and microwave dielectric materials [31].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of CuO nanoparticle interlinked microsphere cages by solution method

Tian

et al. 2007

Nanoscale Res Lett

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Here we report a very simple method to convert conventional CuO powders to nanoparticle interlinked microsphere cages by solution method. CuO is dissolved into aqueous ammonia, and the solution is diluted by alcohol and dip coating onto a glass substrate. Drying at 80°C, the nanostructures with bunchy nanoparticles of Cu(OH) 2 can be formed. After the substrate immerges into the solution and we vaporize the solution, hollow microspheres can be formed onto the substrate. There are three phases in the as-prepared samples, monoclinic tenorite CuO, orthorhombic Cu(OH) 2 , and monoclinic carbonatodiamminecopper(II) (Cu(NH 3 ) 2 CO 3 ). After annealing at 150°C, the products convert to CuO completely. At annealing temperature above 350°C, the hollow microspheres became nanoparticle interlinked cages.

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Transition metal-promoted silica and alumina catalysts for the selective reduction of nitrogen monoxide with propane

Cited by 216 publications

References 4 publications

Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

Improvement of Catalysts for NO<sub><i>x</i></sub> Storage and Reduction for Gasoline-fueled Automotive Exhaust

Fabrication of CuO nanoparticle interlinked microsphere cages by solution method

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