| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst having excellent performance and durability by improving the NOx denitrification rate at 350°C or higher without degrading excellent durability of a Ti-V-Mo-P-based catalyst in view of a problem of a conventional art. <P>SOLUTION: This NOx denitrification catalyst for exhaust gas is a catalyst composition that comprises titanium (Ti), an oxide of phosphorus (P), and molybdenum (Mo) and/or tungsten (W), an oxide of vanadium (V), and high-silica zeolite that has an SiO<SB POS="POST">2</SB>/Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>ratio of 20 or more. The NOx denitrification catalyst for exhaust gas is obtained by performing kneading in the presence of water, drying and then firing in conditions of (1) titanium oxide, and phosphoric acid or an ammonium salt of phosphoric acid of 1-15 wt.% relative to the titanium oxide in terms of H<SB POS="POST">3</SB>PO<SB POS="POST">4</SB>, (2) an oxo acid or oxo acid salt of molybdenum (Mo) and/or tungsten (W) and an oxo acid salt or vanadyl salt of vanadium (V) of 0-8 atom% and (3) high-silica zeolite of 0-20 wt.% relative to the titanium oxide. <P>COPYRIGHT: (C)2012,JPO&INPIT |
