Method for producing a shell catalyst and corresponding shell catalyst
A technology of catalysts and catalyst carriers, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as adverse effects on catalyst activity, large average dispersion of noble metal particles, etc.
Active Publication Date: 2010-03-31
CLARIANT INT LTD
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Problems solved by technology
In addition, catalysts produced by soaking have a relatively large average dispersion of noble metal particles, which can have a detrimental effect on the activity of the catalyst, among others
Method used
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[0149] The apparatus for carrying out the method according to the invention, referenced 10 as a whole, is at Figure 1A shown in .
[0150] The apparatus 10 has a vessel 20 with an upright cylindrical side wall 18 surrounding the process chamber 15 .
[0151] The process chamber 15 has a bottom 16 below which a blowing chamber 30 is located.
[0152] The bottom 16 comprises a total of seven annular plates placed one above the other as guide plates. The seven annular plates are placed one on top of the other in the following manner: the outermost annular plate 25 forms the lowermost annular plate on which the other six inner annular plates are located, each partially overlapping the underlying annular plate. That ring plate.
[0153] For clarity, only some of the seven annular plates in total are labeled, for example the two overlapping annular plates 26 and 27 . Due to this overlap and spacing, an annular groove 28 is formed between the two annular plates in each case, via ...
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Abstract
The invention relates to a method for producing a shell catalyst which comprises a porous molded catalyst support having an outer shell in which at least one transition metal is contained in metallicform. The aim of the invention is to provide a shell catalyst production method which allows production of supported transition metal catalysts in the form of shell catalysts that have a relatively little shell thickness. The method according to the invention makes use of a device (10) which is adapted to cause the molded catalyst supports to circulate by means of a reducing process gas (40). Saidmethod comprises the following steps: a) feeding molded catalyst supports to the device (10) and causing the molded catalyst supports to circulate by means of a reducing process gas (40); b) impregnating an outer shell of the molded catalyst supports with a transition metal precursor compound by spraying the circulating molded catalyst supports with a solution that contains the transition metal precursor compound; c) converting the metal component of the transition metal precursor compound to the metallic form by reduction with the process gas (40); d) drying the molded catalyst supports thatare sprayed with said solution.
Description
technical field [0001] The invention relates to a method for producing a shell catalyst comprising a porous catalyst support having an outer shell in which at least one transition metal in metallic form is contained. Background technique [0002] Catalysts supporting transition metals in the form of shell catalysts and methods for their production have been disclosed in the prior art. The catalytically active substances (often also cocatalysts) contained in shell catalysts are only in the outer region (shell) of the larger or smaller width of the shaped catalyst support body, i.e. they do not completely penetrate the shaped catalyst support body (cf. e.g. EP565952A1, EP634214A1, EP634209A1 and EP634208A1). With shell catalysts, the reaction can in many cases be controlled more selectively than with catalysts in which the support is loaded with catalytically active substances into the support core (“impregnated completely”). [0003] Currently eg vinyl acetate monomer (VAM)...
Claims
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IPC IPC(8): B01J23/42B01J23/44B01J23/50B01J23/52B01J23/58B01J23/72B01J23/75B01J23/755B01J35/00B01J35/08B01J35/10B01J37/02C07C67/055
CPCB01J23/72B01J35/1042B01J23/52B01J35/08B01J23/50B01J35/10B01J37/0221B01J23/42B01J23/58B01J35/0066B01J35/1014B01J35/002B01J35/1038B01J23/75B01J35/1061B01J35/008B01J37/16B01J35/108B01J23/755B01J23/44B01J35/394B01J35/397B01J35/60B01J35/613B01J35/66B01J35/635B01J35/633B01J35/647B01J35/395B01J35/53B01J35/36B01J35/30B01J35/51
Inventor 阿尔佛雷德·海格梅耶吉哈德·麦斯多彼得·施莱克西尔维亚·纽曼
Owner CLARIANT INT LTD