Platinum-based selective hydrogenation catalyst as well as preparation method and use thereof

A hydrogenation catalyst and selective technology, which is applied in the preparation of amino compounds, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of low catalyst activity and selectivity, low catalytic efficiency, etc., and achieve improved dispersion, Low particle size dependence, eliminates the effect of agglomeration

Active Publication Date: 2009-08-12
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a platinum-based selective hydrogenation catalyst for the lack of high catalyst activity and selectivity and low catalytic efficiency in t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put the activated carbon into a pulverizer and pulverize it into powder, sieve out 100-300 mesh activated carbon, add it to a nitric acid solution with a concentration of 3mol / L, and place it in an ultrasonic generator for ultrasonic immersion for 8 hours, then wash the activated carbon with deionized water to medium and filtered to obtain a pretreated activated carbon filter cake. With 30mL concentration of 0.01g / mL chloroplatinic acid solution, with a concentration of 0.5mol / L K 2 CO 3 The aqueous solution was adjusted to pH 2.5 and used as impregnation solution for catalyst preparation. Then add the activated carbon filter cake to the above impregnation solution, stir and impregnate at 75°C and ultrasonically for 2.5 hours, filter, add deionized water to the filter cake to make a slurry with a volume of 100mL, add formic acid dropwise for reduction by chemical reduction method, then filter and dry After washing until there is no chloride ion, the filter cake is tra...

Embodiment 2

[0024] Put the activated carbon into a pulverizer and pulverize it into powder, sieve out 100-300 mesh activated carbon, add it to a nitric acid solution with a concentration of 3mol / L, and place it in an ultrasonic generator for ultrasonic immersion for 8 hours, then wash the activated carbon with deionized water to medium and filtered to obtain a pretreated activated carbon filter cake. 30 mL of chloroplatinic acid solution with a concentration of 0.01 g / mL was adjusted to a pH value of 2.5 with a KOH aqueous solution with a concentration of 0.5 mol / L as the impregnating solution prepared by the catalyst. Then add the activated carbon filter cake to the above impregnation solution, stir and impregnate at 75°C and ultrasonically for 2.5 hours, filter, add deionized water to the filter cake to make a slurry with a volume of 100mL, add formic acid dropwise for reduction by chemical reduction method, then filter and dry After washing until there is no chloride ion, the filter ca...

Embodiment 3

[0026] Put the activated carbon into a pulverizer and pulverize it into powder, sieve out 100-300 mesh activated carbon, add it to a nitric acid solution with a concentration of 3mol / L, and place it in an ultrasonic generator for ultrasonic immersion for 8 hours, then wash the activated carbon with deionized water to medium and filtered to obtain a pretreated activated carbon filter cake. With 30mL concentration of 0.01g / mL chloroplatinic acid solution, with concentration of 0.5mol / L Na 2 CO 3 The aqueous solution was adjusted to pH 2.5 and used as impregnation solution for catalyst preparation. Then add the activated carbon filter cake to the above impregnation solution, stir and impregnate at 75°C and ultrasonically for 2.5 hours, filter, add deionized water to the filter cake to make a slurry with a volume of 100mL, add formic acid dropwise for reduction by chemical reduction method, then filter and dry After washing until there is no chloride ion, the filter cake is tran...

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Abstract

The invention relates to a platinum-based selective hydrogenation catalyst. The catalyst uses active carbon as a carrier; and based on the total mass of the catalyst, in terms of mass content, the content of active component platinum metal is 0.5 to 5 percent, and the grain diameter of the platinum metal is less than 30 nanometers. The invention also relates to a preparation method for the catalyst: after the active carbon is subjected to ultrasonic treatment by nitric acid solution with a certain concentration, the active carbon is repeatedly washed by deionized water to be neutral and then added into PtCl2 aqueous solution with a certain pH value to carry out ultrasonic immersion, the solution is filtered, a filer cake is pulped and then reduced by using a chemical reduction method and filtered and washed until no chloride ion exist, and the filter cake is transferred into an oven to be dried to form a nano Pt/active carbon catalyst. The invention further relates to application of the catalyst. The catalytic hydrogenation activity of the catalyst is good, the selectivity is high, the catalyst can effectively inhibit dechlorination without adding dehalogenation inhibitor, the preparation process is simple to operate, and the platinum metal is easy to recover.

Description

technical field [0001] The invention relates to a selective hydrogenation catalyst and its preparation method and application; in particular, it relates to a platinum-based selective hydrogenation catalyst and its preparation method and application. Background technique [0002] 3,3-Dichlorobenzidine (DCB) is an important intermediate for the synthesis of yellow and orange organic pigments. A variety of organic pigments with excellent performance are manufactured based on it, which are widely used in inks, paints, rubber, plastics, Production of sallow and other colored and pigment printing pastes and pigment dyeing pastes. At present, all kinds of pigments produced with 3,3-dichlorobenzidine account for more than 25% of the total organic pigment production in the world, and there are 23 categories and more than 600 varieties, which are irreplaceable. In recent years, with the rapid development of my country's ink, paint, rubber, plastic and other related industries, the de...

Claims

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Application Information

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IPC IPC(8): B01J23/42C07C211/52C07C209/36
Inventor 张之翔曾永康朱柏烨文永忠杨乔森孙洁
Owner XIAN CATALYST NEW MATERIALS CO LTD
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