Mesoporous Silica and Its Support Catalyst for Gas Phase Oxylation of Propylene Butyraldehyde

Abstract

The invention discloses a meso-porous silica, a catalyst for vapor phase carbonylation of propylene to butyraldehyde with the meso-porous silica as a carrier, a preparation method of the meso-porous silica, and a preparation method of the catalyst. The preparation method of the meso-porous silica comprises the following steps: 1, carrying out a reflux reaction on bromohexadecane and tetramethylethylenediamine in a 80-90DEG C water bath to obtain a carrier template C16-2-C16; and 2, dissolving the carrier template C16-2-C16 in water, adding a silicon source, adjusting the pH value to 4.5-5.5, carrying out heating crystallization, drying granular solids, carrying out high temperature roasting at 500-550DEG C to remove the carrier template C16-2-C16 in order to obtain the meso-porous silica (SiO2). The catalyst comprises the carrier, and a catalytic activity substance and an assistant which are supported on the carrier, wherein the catalytic activity substance is acetylacetonatodicarbonyl rhodium, and the assistant is triphenyl phosphine. The meso-porous SiO2 material has the advantages of large specific surface area, stable structure, good heat stability, and superior mechanical impact resistance. The catalyst has a stable catalysis performance.

Description

technical field [0001] The invention belongs to the field of gas-phase oxo synthesis catalysis, and in particular relates to a mesoporous silicon dioxide and a propylene gas-phase oxo-synthesis butyraldehyde catalyst used as a carrier and a preparation method thereof. Background technique [0002] Oxylation technology refers to olefins and synthesis gas (CO and H 2 ) is a process in which an addition reaction occurs under the catalysis of a transition metal complex to obtain an aldehyde with one carbon more than the raw material olefin. The most widely used oxo technology in industry is to obtain n-isobutyraldehyde from propylene and synthesis gas under the catalysis of rhodium complex. [0003] Rhodium is generally used as a catalyst in the propylene oxo synthesis process, and oil-soluble triphenylphosphine is used as a ligand, which is dissolved in the solvent butyraldehyde. The separation of the catalyst and the product is realized by a set of high and low pressure evapo...

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Problems solved by technology

[0008] Chinese patent CN1781602A discloses a SiO modified with phosphotungstic acid 2 The method of supported rhodium phosphine catalyst, it will RhCl 3 and triphenylphosphine were directly dissolved in absolute ethanol and then immobilized on SiO by impregnation 2 , the catalyst prepared by this method has stable performance and high catalytic activity, but due to RhCl 3 The solubility in ethanol is low, resulting in a low content of catalytically active substances in the solid-supported catalyst, and the catalytic effect is not ideal

This method is to use the method of chemical bonding to load the active substance on the carrier, so the active substance and the carrier are closely combined, and the loss rate of rhodium in the catalytic process is low, but the process of this method is complicated and has strict requirements on the operation index, so it is difficult to large-scale industrialization at present.

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