Hydrogen peroxide catalyst

Does the “hydrogen peroxide catalyst” mentioned by the poster refer to one used for catalyzing organic synthesis reactions, or to the anthraquinone catalysts used in the hydrogen peroxide production process? Please explain.

The ideal catalyst should have good activity, high selectivity, low palladium content, good strength, and low resistance.

What Brother Xiaohua mentioned is an ideal state. The hydrogen peroxide-palladium catalysts used in China are working towards achieving this goal! Ball-shaped catalysts with a 2-millimeter oil column height have no issues regarding activity and strength, but their selectivity is somewhat poor. Bar-shaped catalysts offer better selectivity, yet their activity is low; roll-shaped catalysts tend to lose palladium, which is why they are hardly used anymore. Now, ball-shaped catalysts with an oil column height of around 3 millimeters have been developed – they combine the advantages of both ball-shaped and bar-shaped catalysts, resulting in improved activity and selectivity, with quite good outcomes.

Our company has newly installed a 100,000-ton peroxide production plant using the anthraquinone process, with palladium as the catalyst.

Domestically, palladium catalysts come in bar form (including clover shape) and spherical form, with alumina as the support in all cases. The spherical palladium catalysts currently used in fixed-bed reactors have a particle size of ф2–4 mm ； The typical palladium content (by mass) is 0.2%–0.3% ； The apparent density is generally 0.45–0.65 g/ml ； Compressive strength is generally >40 N/particle ； The production capacity is around 3.3 kg H2O2 (100%)/(kg catalyst•d) ； The service life is 3 to 5 years (when the catalyst’s activity declines, it can be regenerated multiple times using steam or organic solvents to restore its activity). During use, palladium catalysts commonly face issues such as large fluctuations in hydrogenation efficiency, rapid degradation, caking of the catalyst layer, pulverization of the catalyst, and excessive bed resistance. These issues are influenced by catalyst activity and selectivity, operating conditions, and external conditions. Catalyst carrier, active center, additives, structure, and manufacturing process are the main factors affecting activity. Currently, catalyst manufacturers are making gradual improvements in carrier selection, catalyst production, and properties in order to enhance hydrogenation efficiency as well as the catalyst’s activity and selectivity. The main research areas are: (1) the distribution of active components on the surface of the carrier ； (2) The role of adding additives ； (3) Manufacturing method. All three are expected to significantly improve the selectivity of the catalyst while maintaining high activity, reduce the degree of anthraquinone degradation during the hydrogenation process, thereby fundamentally increasing the production capacity of hydrogen peroxide and reducing consumption. This post was last edited by zyin on 2007-12-22 09:57.]

May I ask which company the original poster works for? Are they involved in the production of palladium catalysts? Have the newly developed catalysts been used in actual manufacturing facilities? How to contact.

Have any manufacturers used spherical catalysts formed with an oil column of about 3 millimeters in thickness?

Several manufacturers in Shandong and Anhui have used it, and the results are good.

To get in touch with the poster, please send an email to zxh1717@163.com (I’m looking for spherical contacts with an oil column height of around 3 millimeters) – details included