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A method for n-hexadecane hydroisomerization reaction on a supported crystalline nickel phosphide catalyst

A technology of hydroisomerization and n-hexadecane, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low selectivity, high cost of catalysts containing noble metals, and resistance to sulfide poisoning To achieve the effects of high reactivity, high reactivity and isomerization selectivity, and excellent resistance to carbon deposition and sulfide poisoning

Active Publication Date: 2019-10-22
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost, poor resistance to sulfide poisoning and low selectivity of isomerization catalysts without noble metals used in the prior art for long carbon chain heavy alkane isomerization containing noble metal catalysts problem, and provide a method for n-hexadecane hydroisomerization reaction on supported crystalline nickel phosphide catalyst

Method used

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  • A method for n-hexadecane hydroisomerization reaction on a supported crystalline nickel phosphide catalyst
  • A method for n-hexadecane hydroisomerization reaction on a supported crystalline nickel phosphide catalyst
  • A method for n-hexadecane hydroisomerization reaction on a supported crystalline nickel phosphide catalyst

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specific Embodiment approach 1

[0017] Specific embodiment one: the method for n-hexadecane hydroisomerization reaction on a kind of supported crystalline nickel phosphide catalyst of the present embodiment is carried out according to the following steps:

[0018] Load the 20-40 mesh supported crystalline nickel phosphide catalyst into the constant temperature zone of the fixed-bed isothermal reactor, and activate it for 20min-100min at a temperature of 400-500°C and a hydrogen flow rate of 20mL / min-80mL / min, Then inject n-hexadecane into the fixed-bed isothermal reactor by means of continuous injection, when the reaction temperature is 280-420°C, the reaction pressure is 1MPa-4MPa, and the mass space velocity of n-hexadecane is 1h -1 ~4h -1 Reacting with hydrogen and n-hexadecane at a volume ratio of 300 to 800:1 to obtain isohexadecane;

[0019] The supported crystalline nickel phosphide catalyst is a crystalline nickel phosphide catalyst supported by SAPO-31 molecular sieves.

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that: the SAPO-31 molecular sieve is a SAPO-31 molecular sieve with a circular one-dimensional linear pore structure and mild acidity. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the mass ratio of nickel phosphide to SAPO-31 molecular sieve in the crystalline nickel phosphide catalyst supported by the SAPO-31 molecular sieve is 3 to 8: 100, and the metal active site is located on the 111 crystal plane of nickel phosphide crystal. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to an n-hexadecane hydroisomerization reaction method on a loaded crystalline state nickel phosphide catalyst, belongs to the field of heavy alkane isomerization, and particularly relates to the n-hexadecane hydroisomerization reaction method on the loaded crystalline state nickel phosphide catalyst. The invention aims at solving the problems of a precious-metal-containing catalyst used for long-carbon-chain heavy alkane isomerization in the prior art of high cost and poor sulfide poisonousness resistant performance and the problem of a precious-metal-free isomerization catalyst of low selectivity. According to the method, Ni(NO3)2 6H2O and (NH4)2HPO4 are dissolved into water; SAPO-31 molecular sieves are added; drying is performed at the temperature being 100 DEG C; then, the materials are put into a muffle furnace to be roasted; then, temperature-programmed reduction is performed in hydrogen gas atmosphere to obtain the catalyst; the catalyst is filled into a reactor; the n-hexadecane hydroisomerization reaction is performed.

Description

technical field [0001] The invention belongs to the field of isomerization of heavy alkanes, in particular to a method for hydroisomerization reaction of n-hexadecane on a supported crystalline nickel phosphide catalyst. Background technique [0002] In recent years, with the development of the global automobile industry and the advancement of engine technology, especially the continuous improvement of environmental protection requirements worldwide, there is a demand for environmentally friendly alkylated fuel oils with low aromatics and olefins and good performance The amount is increasing day by day. Compared with the traditional method of solvent dewaxing and cracking dewaxing to reduce the content of n-alkanes in diesel oil to lower its freezing point, the n-alkanes (waxes) in the distillate obtained from petroleum refining are converted by hydroisomerization reaction Branched chain alkanes are the most efficient way to produce low freezing point fuel oils. [0003] O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/13C07C9/16B01J29/85
Inventor 吴伟张阳冯兆路
Owner HEILONGJIANG UNIV
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