发明名称 |
Carrier catalyst, process for its preparation, and its use for the preparation of vinyl acetate |
摘要 |
The invention relates to a process for the preparation of a catalyst which contains palladium and/or compounds thereof and alkali metal compounds, and additionally cadmium compounds and/or gold and/or compounds thereof, on support particles which have been pressed from SiO2 or an iO2-Al2O3 mixture with the aid of a binder which comprises a) washing the roasted support particles with an acid which does not react with SiO2 or SiO2-Al2O3 mixtures, until no further cations of the binder employed during pressing of the support particles are released from the support particles; b) then impregnating the support particles with palladium, and gold or cadmium; c) then bringing the impregnated support particles into contact with a solution of a base at least until the thickness of the nobel metal shell generated in this way on the support particles no longer changes substantially; and d) then impregnating the support particles with an alkali metal compound. A shell-like distribution of the palladium and if appropriate of the gold in the support particles is generated in this manner. Furthermore, the invention relates to a catalyst prepared in this way and to its use for the preparation of vinyl acetate.
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申请公布号 |
US5292931(A) |
申请公布日期 |
1994.03.08 |
申请号 |
US19930044212 |
申请日期 |
1993.04.07 |
申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
WIRTZ, PETER;WOERNER, KARL-FRED;WUNDER, FRIEDRICH;EICHLER, KLAUS;ROSCHER, GUENTER;NICOLAU, IOAN |
分类号 |
B01J23/44;B01J23/06;B01J23/48;B01J23/52;B01J23/58;B01J23/60;B01J23/66;B01J23/89;B01J35/10;B01J37/00;B01J37/02;C07B61/00;C07C67/05;C07C67/055;C07C69/15;(IPC1-7):C07C67/05 |
主分类号 |
B01J23/44 |
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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