Abstract: <P class=MsoNormal><SPAN lang=EN-US>Rare earth oxygen storage material CeO</SPAN><SPAN lang=EN-US><SUB>2</SUB>-ZrO</SPAN><SPAN lang=EN-US><SUB>2</SUB>-Y</SPAN><SPAN lang=EN-US><SUB>2</SUB>O</SPAN><SPAN lang=EN-US><SUB>3</SUB><SPAN style="mso-spacerun: yes">&nbsp; </SPAN>was prepared by parallel flow method using cetyltrimethyl ammonium bromide (CTAB) as template.For compared,CeO<SPAN lang=EN-US><SUB>2</SUB>-ZrO</SPAN><SPAN lang=EN-US><SUB>2</SUB>-Y</SPAN><SPAN lang=EN-US><SUB>2</SUB>O</SPAN><SPAN lang=EN-US><SUB>3</SUB></SPAN></SPAN><SPAN lang=EN-US> was also prepared by dropping NH</SPAN><SPAN lang=EN-US><SUB>3</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: " Roman?? New ?Times mso-hansi-font-family: Roman?; Times>·</SPAN><SPAN lang=EN-US>H</SPAN><SPAN lang=EN-US><SUB>2</SUB>O into inorganic salt.Results showed:CeO<SPAN lang=EN-US><SUB>2</SUB>-ZrO</SPAN><SPAN lang=EN-US><SUB>2</SUB>-Y</SPAN><SPAN lang=EN-US><SUB>2</SUB>O</SPAN><SPAN lang=EN-US><SUB>3</SUB></SPAN></SPAN><SPAN lang=EN-US> prepared by parallel flow method had higher surface area and oxygen storage capacity,which were in excess of <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" UnitName="m" SourceValue="172.4" HasSpace="True" Negative="False" NumberType="1" TCSC="0">172.4 m</st1:chmetcnv></SPAN><SPAN lang=EN-US><SUP>2</SUP>/g and 637.5 </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: " Roman?? New ?Times mso-hansi-font-family: Roman?; Times>μ</SPAN><SPAN lang=EN-US>mol/g,respectively,after calcination at <st1:chmetcnv w:st="on" UnitName="℃" SourceValue="600" HasSpace="True" Negative="False" NumberType="1" TCSC="0">600 <SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family: " Roman?? New ?Times mso-hansi-font-family: Roman?; Times><SPAN lang=EN-US>℃</SPAN></SPAN></st1:chmetcnv>.Its oxygen storage capacity also maintained at about 590 </SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: " Roman?? New ?Times mso-hansi-font-family: Roman?; Times>μ</SPAN><SPAN lang=EN-US>mol/g after high temperature and aging processes,which showed the sample prepared by parallel flow method had excellent anti-aging capability and oxygen storage capacity.The catalytic performance evaluation showed that TWCs doping with CeO<SPAN lang=EN-US><SUB>2</SUB>-ZrO</SPAN><SPAN lang=EN-US><SUB>2</SUB>-Y</SPAN><SPAN lang=EN-US><SUB>2</SUB>O</SPAN><SPAN lang=EN-US><SUB>3</SUB></SPAN></SPAN><SPAN lang=EN-US> sample were all suitable for CNG automobiles and LPG automobiles,which have better active performance in LPG automobiles.<BR></SPAN></P>