Novel precursor compound for preparing platinum-carrying catalyst and synthetic method thereof

Abstract

The invention relates to new type precursor compounds for preparing platinum carrying catalyst [Pt(NH3)4]X2(X2=oxalate, malonate and 1, 1-cyclobutanes dicarboxylate), and a method for making same. The compounds can provide complex cation [Pt(NH3)4]<2+>, is propitious to perform high-performance catalyst on carrier or sodium-typed molecular sieve for adsorbing and exchanging electrified negativity. The preparation of the compounds uses K2PtCl4 as starting material to obtain the intermediate body cis-[Pt(NH3)2I2] by iodination and ammine substitution, and then to obtain the target compounds after hydration, coordination and ammine displacement, and the yield can reach 90.

Description

technical field [0001] The present invention relates to a class of novel precursor compounds [Pt(NH 3 ) 4 ]X 2 (X 2 = oxalate, malonate and 1,1-cyclobutane dicarboxylate) and a preparation method thereof, belonging to the field of chemical catalysis. Background technique [0002] Platinum-supported catalysts are important catalysts for a class of heterogeneous reactions, and have been widely used in various fields such as petrochemicals, organic synthesis, automobile manufacturing, and environmental governance. At present, the commonly used carrier materials are mainly Al 2 o 3 , SiO 2 、TiO 2 , rare earth oxides, activated carbon, molecular sieves, etc., such as Pt-Re / Al catalysts for petroleum reforming reactions 2 o 3 , Automobile exhaust gas purification catalyst Pt-Pd-Rh / Al 2 o 3 , Organic wastewater oxidation purification catalyst Pt-Pd / TiO 2 [Chinese Mechanical Engineering Society, Editor-in-Chief of China Materials Research Society, China Materials Enginee...

AI Technical Summary

Problems solved by technology

However, many experiments have found that a small amount of chlorine will reduce the high temperature resistance and service life of platinum catalysts, and the source of chlorine in the catalyst is mainly the use of chlorine-containing precursor compounds

At the same time, the surface of many catalyst supports is negatively charged, for example: Al 2 o 3 and other oxides will form a layer of hydrated oxide Al(OH) 3 and AlO(OH), converted to Al(OH) in alkaline impregnation environment 4 - and AlO 2 - [D.K.Paul, C.M.Marten, langmuir, 1999, 15, 4508-4512; J.Vakros, K.Bourikas, Ch.Kordulis, J.Phys.Chem., B, 2003, 107, 1804-1813], pair cations It has a good adsorption effect on the anion PtCl 6 2- , PtCl 4 2 - Compound adsorption effect is poor; sodium molecular sieve Na + [(Al 2 o 3 )p(SiO 2 )q]wH 2 O has a good ion exchange effect on cations, and has a good ion exchange effect on anions PtCl 6 2- , PtCl 4 2- Compound exchange effect is poor [edited by Wang Shangdi, Sun Junquan, Introduction to Catalyst Engineering, 40-44, Chemical Industry Press, 2006]

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