| abstract |
Provided are: an exhaust gas purifying composition which includes a phosphorus-containing BEA-type zeolite and has further improved heat resistance; and a production method therefor.　This exhaust gas purifying composition includes a phosphorus-containing BEA-type zeolite, wherein, in the phosphorus-containing BEA-type zeolite, the pore volume ratio (V2/V1) of the volume V2 of micropores having a pore diameter in the range of at most 2 nm, as measured through a SF method, to the volume V1 of mesopores having a pore diameter in the range of 2-100 nm, as measured through a BJH method, is at least 2.0. |