Adsorbent for nitrogen oxides and its treatment method
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United States of America Patent
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Jul 15, 2003
Grant Date -
Mar 14, 2002
app pub date -
Mar 5, 2001
filing date -
Sep 12, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of treating a hollandite compound to improve its adsorption of nitrogen monoxide, which comprises subjecting a hollandite compound having a hollandite-type crystal structure and represented by a chemical formula A.sub.x M.sub.y N.sub.8-y O.sub.16, wherein A is an alkali metal or an alkaline earth metal K, Na, Rb or Ca, M is a bivalent or trivalent metal element Fe, Ga, Zn, In, Cr, Co, Mg, Al or Ni, N is a tetravalent metal element Sn or Ti, 0
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