发明名称 |
PREPARATION OF MODIFIED ZEOLITES |
摘要 |
Selective and controlled dealumination of an aluminosilicate zeolite is achieved by filling the pore system of the zeolite with a foreign material, for example coke, removing part of the foreign material from the outer portion of the zeolite, for example by heating in a gas stream comprising oxygen, dealuminating the outer portion, and then removing the remainder of the foreign material. Use of such a partially dealuminated zeolite as catalyst in a toluene disproportionation reaction leads to greater selectivity to paraxylene. |
申请公布号 |
DE3377414(D1) |
申请公布日期 |
1988.08.25 |
申请号 |
DE19833377414 |
申请日期 |
1983.05.13 |
申请人 |
IMPERIAL CHEMICAL INDUSTRIES PLC |
发明人 |
DEWING, JOHN;HOGAN, PHILIP JOHN;STEWART, ALLAN |
分类号 |
B01J29/00;B01J29/40;B01J29/80;C01B39/02;C01B39/04;C01B39/38;C07B61/00;C07C1/00;C07C6/12;C07C15/02;C07C67/00;(IPC1-7):C01B33/28;B01J29/06 |
主分类号 |
B01J29/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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