Method for processing dehydrogenation catalyst before application
A technology of dehydrogenation catalyst and treatment method, which is applied in the field of C3-C7 alkane dehydrogenation to olefins catalyst application field, and can solve the problems of insufficient catalyst selectivity and stability, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
preparation example Construction
[0013] The dehydrogenation catalyst can be prepared by a conventional method, such as using an impregnation method to support the dehydrogenation active metal, and the auxiliary agent can be introduced during the preparation of the alumina carrier and / or by an impregnation method.
[0014] The catalyst of the present invention uses Sn-containing alumina as a carrier, and the dehydrogenation active metal component is generally selected from one or more of platinum, palladium, iridium, rhodium or osmium in the platinum group, and the amount is calculated as the weight of the carrier in terms of simple substance. 0.01% to 2%. The content of Sn is 0.1%-10% of the weight of the carrier in terms of simple substance.
[0015] In the dehydrogenation catalyst with Sn-containing alumina as the carrier of the present invention, Sn is introduced into the Sn-containing material when the alumina is gelled, and then made into a carrier.
[0016] In the dehydrogenation catalyst with Sn-conta...
example 1
[0034] Preparation of Sn-containing alumina support. After mixing a certain amount of 0.98M aluminum trichloride solution and 0.01M tin tetrachloride solution, add a certain amount of 8% ammonia water, mix evenly in a neutralization tank at 60-80°C, and control the pH value from 7.0 to 9.0, after filtering, washing with water and acidifying, pressurize into spheres in an oleyl ammonia column, dry, age, and roast at 650°C for 4 hours to obtain alumina spheres containing 0.3wt% Sn.
[0035] The alumina pellet carrier containing 0.3wt% Sn was calcined at 800°C for 3h, the calcined carrier was immersed in an aqueous solution containing chloroplatinic acid for 6h at 70°C, dried at 120°C for 2h, and calcined at 500°C for 4h. Dechlorination in air containing 20v% water vapor at 450°C for 4h. Then at 70 °C with KNO 3 Soaked in aqueous solution for 2h, dried and roasted under the same conditions. The catalyst PDH-FY is prepared, and the composition of the carrier weight is 0.5wt% of...
example 2
[0046] Catalyst PDH-FY was prepared in the same manner as in Example 1. The amount of vulcanizing agent is 105% of the theoretical sulfur requirement of the active metal of the dehydrogenation catalyst, impregnated twice, dried at 120°C for 2 hours after the first impregnation, and dried at 120°C for 4 hours in the presence of inert gas after the second impregnation , to obtain presulfided dehydrogenation catalyst B. The elemental sulfur in the inorganic polymeric sulfide accounts for 40% of the theoretical sulfur demand of the dehydrogenation catalyst, and the rest is ammonium sulfide.
[0047] Reduction conditions: the reduction is carried out by means of temperature programming, and the volume space velocity is 900h -1 , reduced at 480°C for 1 hour, the hydrogen is high-purity hydrogen.
[0048] Evaluation conditions: catalyst volume 3.0ml, volume space velocity 3000h -1 , the reaction pressure is 0.1 MPa, the reaction temperature is 520° C., and the molar ratio of hydro...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More