Method of preparing Pt/KL catalyst for alkane aromatization by using spongy platinum as platinum source

Abstract

The invention provides a method of preparing a Pt / KL catalyst for alkane aromatization by using spongy platinum as a platinum source. The method comprises the following steps: using the spongy platinum with a relatively-low price and a wide range of sources as the platinum source, dissolving the spongy platinum by using aqua regia to obtain a spongy platinum solution, adding distilled water for aplurality of times, and performing heating concentration for a plurality of times until no acid mist is generated; adding a reducing agent at room temperature, performing heating to 20-100 DEG C, andperforming a reaction to obtain a wine red acidic solution containing divalent Pt elements; performing heating to boiling, and supplementing an alkaline substance until the solution becomes colorlessand transparent; and supplementing water or performing concentration for a plurality of times until the pH of the solution is 7-12, adding KL zeolite, performing impregnation under stirring at room temperature, performing drying, and performing calcination to obtain the Pt / KL zeolite molecular sieve catalyst for alkane aromatization. The method provided by the invention can fully solve the problemthat a current effective platinum-containing compound required for preparing a Pt / KL catalyst for aromatization lacks sources and is expensive, and the prepared Pt / KL catalyst has excellent alkane aromatization activity.

Description

technical field [0001] The invention belongs to the technical field of KL-type zeolite catalysis, and specifically relates to a method for preparing a Pt / KL zeolite molecular sieve type paraffin aromatization catalyst by using sponge platinum as a platinum source. Preparation cost of Pt / KL catalyst. Background technique [0002] C 6 ~C 8 Paraffins are a class of hydrocarbon molecules with a lower octane number in naphtha components, especially C 6 ~C 8 n-Alkanes with a research octane number generally below 30. However, some naphtha fractions contain a large amount of C 6 ~C 8 Paraffin components make it difficult for this part of naphtha resources to be effectively utilized as gasoline blending components. The reformed raffinate from the catalytic reforming unit is the most widely sourced, rich in C 6 ~C 8 Naphtha resources of paraffinic components. Since the research octane number of reformed raffinate is usually only in the range of 65-70, it cannot be used as a...

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Problems solved by technology

[0023] In order to solve the problem that platinum-containing compounds required in the preparation process of Pt / KL zeolite molecular sieve paraffin aromatization catalysts are relatively expensive, resulting in relatively high catalyst costs, and the source of such platinum-containing compounds is scarce when the demand is large. The invention provides a method for preparing a relatively low-cost Pt / KL zeolite molecular sieve paraffin aromatization catalyst based on the basic and relatively easy-to-obtain platinum element-sponge platinum as the base material, through simple chemical reactions and catalyst preparation processes

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