Preparation and application of a C5/C6 normal paraffin isomerization catalyst

Abstract

The invention discloses a preparation method of an isomerization catalyst using nickel phosphide prepared by a low-temperature thermal reduction method as an active phase, and is applied to catalyze the isomerization of C5 / C6 normal alkanes. The carrier of the catalyst is H-Beta molecular sieve, the active phase is nickel phosphide obtained by low-temperature thermal reduction of hypophosphite and nickel salt, and the catalyst is obtained by dry mixing nickel phosphide and molecular sieve. The mass of nickel phosphide accounts for 1% to 10% of the total mass of the catalyst. The method of applying the catalyst to the isomerization of C5 / C6 alkanes is as follows: fill the prepared catalyst in the fixed bed reactor, and feed the catalyst according to the molar ratio of hydrogen to normal alkanes (n(H2 / Cn)) at 1 to 6:1, The reaction temperature is 250°C-350°C, the reaction pressure is 1-4MPa, and the mass space velocity of normal alkanes is 0.5-5h-1, and the isomerization reaction is carried out. The catalyst involved in the invention has the advantages of easy preparation, low cost, high activity, good stability, etc., and has good application prospects.

Description

technical field [0001] The present invention relates to a kind of nickel phosphide produced by hypophosphite and nickel salt low-temperature thermal reduction method as active phase, the preparation of catalyst with H-Beta molecular sieve as carrier, and the catalyst prepared in C 5 / C 6 Application in the isomerization reaction of normal alkanes. Background technique [0002] At present, the main source of gasoline in my country is catalytic cracking gasoline, in which the content of olefins and aromatics is relatively high. In the past, they have been used as components to maintain the high octane number of gasoline, and have not been strictly restricted. However, as relatively active hydrocarbons, olefins are not stable in themselves. Not only are they prone to react to form colloids and carbon deposits, which affect the stability of gasoline, but also cause environmental pollution; and aromatics can also cause carcinogen emissions and affect human health. With the incr...

AI Technical Summary

Problems solved by technology

but C 5 / C 6 Due to the short carbon chain and small molecular weight of mixed alkanes, C 5 / C 6 There is a major difference between the isomerization of mixed alkanes and the isomerization of long-chain alkanes, and the trial and effect of the catalyst are difficult to apply and consider

Moreover, in the preparation process of the patented catalyst, it needs to be calcined at 500°C for 4 hours to prepare the catalyst precursor. The preparation process requires high temperature, high equipment requirements, complicated process, high energy consumption and high cost.

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