TY - JOUR

T1 - Alternative alkali resistant deNOx catalysts

A1 - Putluru,Siva Sankar Reddy

A1 - Kristensen,Steffen Buus

A1 - Due-Hansen,Johannes

A1 - Riisager,Anders

A1 - Fehrmann,Rasmus

AU - Putluru,Siva Sankar Reddy

AU - Kristensen,Steffen Buus

AU - Due-Hansen,Johannes

AU - Riisager,Anders

AU - Fehrmann,Rasmus

PB - Elsevier BV

PY - 2012

Y1 - 2012

N2 - <p>Alternative alkali resistant deNO_xcatalysts were prepared using three different supports ZrO₂, TiO₂<br/> and Mordenite zeolite. The majority of the catalysts were prepared by incipient wetness impregnation<br/> of a commercial support, with vanadium, copper or iron precursor, one catalyst was prepared by<br/> onepot sol–gel method. All catalysts were characterized by BET, XRPD and NH₃-TPD. Initial SCR activities<br/> of 8 out of 9 catalysts showed higher NO conversion at least at one temperature in the temperature<br/> range 300–500 ◦C compared to the conventional V₂O₅-WO₃/TiO₂ catalyst. After potassium poisoning<br/> (100–130 µmol of K/g of catalyst) the relative drop in SCR activity and acidity was lower for all the<br/> alternative catalysts compared to the industrial V₂O₅-WO₃/TiO₂ catalyst. Furthermore, Cu/MOR and<br/> Nano-V₂O₅/Sul-TiO₂ catalysts showed 8–16 times higher SCR activities than the conventional even after<br/> high potassium doping (250 and 280 µmol of K/g, respectively). The increased poisoning resistance was<br/> due to high substrate acidity (sulphated, heteropoly acid promoted and zeolite supports), substituting<br/> the active species of the catalyst (other than vanadium species, i.e. Cu, Fe) and new catalyst synthesis<br/> methods (Nano-V₂O₅/Sul-TiO₂ catalyst prepared by sol–gel method).</p>

AB - <p>Alternative alkali resistant deNO_xcatalysts were prepared using three different supports ZrO₂, TiO₂<br/> and Mordenite zeolite. The majority of the catalysts were prepared by incipient wetness impregnation<br/> of a commercial support, with vanadium, copper or iron precursor, one catalyst was prepared by<br/> onepot sol–gel method. All catalysts were characterized by BET, XRPD and NH₃-TPD. Initial SCR activities<br/> of 8 out of 9 catalysts showed higher NO conversion at least at one temperature in the temperature<br/> range 300–500 ◦C compared to the conventional V₂O₅-WO₃/TiO₂ catalyst. After potassium poisoning<br/> (100–130 µmol of K/g of catalyst) the relative drop in SCR activity and acidity was lower for all the<br/> alternative catalysts compared to the industrial V₂O₅-WO₃/TiO₂ catalyst. Furthermore, Cu/MOR and<br/> Nano-V₂O₅/Sul-TiO₂ catalysts showed 8–16 times higher SCR activities than the conventional even after<br/> high potassium doping (250 and 280 µmol of K/g, respectively). The increased poisoning resistance was<br/> due to high substrate acidity (sulphated, heteropoly acid promoted and zeolite supports), substituting<br/> the active species of the catalyst (other than vanadium species, i.e. Cu, Fe) and new catalyst synthesis<br/> methods (Nano-V₂O₅/Sul-TiO₂ catalyst prepared by sol–gel method).</p>

KW - Selective catalytic reduction

KW - Potassium resistivity

KW - Deactivation

KW - NH3-TPD

KW - deNOx

U2 - 10.1016/j.cattod.2011.10.012

DO - 10.1016/j.cattod.2011.10.012

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

VL - 184

SP - 192

EP - 196

ER -