A kind of catalyst for Fischer-Tropsch synthesis of low molecular linear alkane isomerization

Abstract

A kind of Fischer-Tropsch synthesis of low molecular linear alkane (nC 5 ‑nC 8 ) isomerization catalyst, preparation method and application thereof, for solving the problems of low activity, poor stability and low conversion rate of the existing Fischer-Tropsch synthesis low molecular linear alkane isomerization catalyst. The present invention adopts the co-precipitation method to prepare Al 2 O 3 ‑ZrO 2 Composite oxide carrier, adding lanthanum salt to increase the proportion of zirconia tetragonal phase, regulating Al 2 O 3 content to keep the catalyst acidity, and then prepare Ni‑WO by the equal volume impregnation method 3 / Al 2 O 3 ‑ZrO 2 catalyst, obtained with Al 2 O 3 ‑ZrO 2 A catalyst for Fischer-Tropsch synthesis of low-molecular linear alkane isomerization with active metal components of Ni, W and La as a carrier. The contents of the three active components are 1-5wt% of Ni, 10-15wt% of W and 0.5-2.5wt% of La. The catalyst has high isomerization activity and selectivity, good repeatability and catalytic stability, and low reaction temperature, and can maintain the isomerization activity of low-molecular linear alkanes at high temperatures.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a catalyst for Fischer-Tropsch synthesis of low-molecular linear alkane isomerization, a preparation method and applications thereof. Background technique [0002] With the increasingly high requirements of environmental protection, hydrodesulfurization and olefin reduction of gasoline can reduce the sulfur content to below 10μg / g and the olefin content to below 24v%. Although the content of olefins and aromatics in gasoline is gradually reduced, its octane number has also been greatly reduced. Selective hydrocracking or isomerization is required to reduce sulfur, olefin content with little or no loss of octane number. Hydroisomerization is particularly important for increasing the octane number of gasoline. The RON of isoparaffins is much higher than that of n-paraffins with the same carbon number. For example, nC 6 RON is 24.8, while 2,2-dimethyl C ...

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Problems solved by technology

However, pure zirconia has disadvantages such as small specific surface area and weak surface acidity, and is not suitable for industrial production. Some researchers choose to dope metal atoms containing p or d orbitals in zirconia (such as Ti, Ce, Al, Si etc.), the introduction of different metal atoms will cause different changes to the properties of ZrO2, such as the introduction of metal atoms Ti will increase the specific surface area of ​​the composite oxide carrier, thereby improving the catalytic activity of the catalyst; the introduction of rare earth metal atoms such as Ce will improve The thermal stability and oxygen storage capacity of the support; the introduction of metal atoms containing acidic sites such as Al will increase the adsorption capacity and surface acidity of the composite oxide support

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