Pt-based multi-component catalyst for dehydrogenation of propane to propylene and preparation method thereof

A propane dehydrogenation and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of poor dispersion, low selectivity, and stability of Pt catalysts problems such as poor properties, and achieve the effects of small Pt particles, high dispersion, and poor breakthrough stability.

Active Publication Date: 2021-09-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two types of catalysts have been widely used in the actual propane dehydrogenation reaction, both types of catalysts have disadvantages: Pt-based catalysts are limited by the synthesis method, resulting in poor dispersion of Pt catalysts and relatively high deactivation at high temperatures. quick
[0005] At present, in the commercial propane dehydrogenation process, the most effective additive Sn will be used in the synthesis of Pt-based catalysts, because the addition of additive Sn can reduce side reactions such as hydrogenolysis, so that carbon deposits can be transferred from the original active center to the catalyst carrier. Catalysts that add a metal promoter still have defects such as low selectivity and poor stability. Therefore, in addition to adding Sn as a promoter, the current research direction often adds a second or even The third additive is to optimize the interaction between the Sn species and the catalyst support, and to inhibit the catalyst Sn 4+ The reduction of Sn guarantees 4+ The stability in the reaction enables the target catalyst to contain more active centers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 5.00 g of γ-Al 2 o 3 powder, treated in a heating furnace at 150 °C for 12 h under a nitrogen atmosphere, and the dehydrated γ-Al obtained after heat treatment 2 o 3 As a carrier; weigh an appropriate amount of niobium oxalate (C 10 h 5 NbO 20 ) to prepare the oxalic acid solution of niobium oxalate, then add the above-mentioned carrier into the oxalic acid solution, soak at 30 °C for 8 h, dry at 120 °C for 2 h, and roast at 550 °C for 4 h; weigh an appropriate amount of SnCl 4 and (NH 4 ) 2 PtCl 4 Prepare an aqueous solution, place the calcined carrier in SnCl 4 -(NH 4 ) 2 PtCl 4In the aqueous solution, immerse at 30 °C for 10 h, then dry at 120 °C for 2 h, and calcined at 350 °C for 2 h; the obtained catalyst precursor was reduced at 570 °C for 2 h in a 10 vol % hydrogen atmosphere to obtain Pt-2Sn-Nb 5 % / γ-Al 2 o 3 Catalyst (wherein Nb 2 o 5 The content of Pt is 5.0 wt%, the content of Pt is 0.5 wt%, and the content of Sn is 1 wt%).

[0030] P...

Embodiment 2

[0032] Weigh 5.00 g of γ-Al 2 o 3 powder, treated in a heating furnace at 150 °C for 12 h under a nitrogen atmosphere, and the dehydrated γ-Al obtained after heat treatment 2 o 3 As a carrier; weigh an appropriate amount of tantalum ethoxide to prepare an ethanol solution of tantalum ethoxide, then add the above carrier into the ethanol solution, soak at 30°C for 8h, dry at 150°C for 2h, and roast at 550°C for 4h; weigh an appropriate amount of SnCl 4 and (NH 4 ) 2 PtCl 4 Prepare an aqueous solution, place the calcined carrier in SnCl 4 -(NH 4 ) 2 PtCl 4 In the aqueous solution, immerse at 30 °C for 10 h, then dry at 120 °C for 2 h, and calcined at 350 °C for 2 h; the obtained catalyst precursor was reduced at 570 °C for 2 h in a 10vol% hydrogen atmosphere to obtain Pt-2Sn-Ta 1% / γ-Al 2 o 3 Catalyst (where Ta 2 o 5 The content of Pt is 1.0 wt%, the content of Pt is 0.5 wt%, and the content of Sn is 1 wt%).

[0033] Pack 200 mg of the catalyst obtained in a fixed-...

Embodiment 3

[0035] Weigh 5.00 g of γ-Al 2 o 3 powder, treated in a heating furnace at 150 °C for 12 h under a nitrogen atmosphere, and the dehydrated γ-Al obtained after heat treatment 2 o 3 As a carrier; weigh an appropriate amount of titanium nitrate (Ti(NO 3 ) 4 ) to prepare an aqueous solution of titanium nitrate, then add the above carrier into the aqueous solution, soak at 30°C for 8h, dry at 150°C for 2h, and roast at 550°C for 4h; weigh an appropriate amount of SnCl 4 and (NH 4 ) 2 PtCl 4 Prepare an aqueous solution, place the calcined carrier in SnCl 4 -(NH 4 ) 2 PtCl 4 In aqueous solution, immerse at 30 °C for 10 h, then dry at 120 °C for 2 h, and calcined at 350 °C for 2 h; the obtained catalyst precursor was reduced at 570 °C for 2 h in a 10vol% hydrogen atmosphere to obtain Pt-2Sn-3Ti / γ-Al 2 o 3 Catalyst (the content of Ti is 1.5 wt%, the content of Pt is 0.5 wt%, and the content of Sn is 1 wt%).

[0036] Pack 200 mg of the obtained catalyst into a fixed-bed tubu...

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PUM

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Abstract

The invention discloses a Pt-based multi-component catalyst for propane dehydrogenation to propylene, as well as its preparation and application. The catalyst is composed of four components A, B, C and D, wherein A is any one of transition metal oxides, alkaline earth metal oxides or rare earth metal oxides, B is the simple substance of Pt, and C is the oxidation of Sn material, D is dehydrated alumina. The present invention utilizes the interaction between metal additives and Pt and Sn to realize high dispersion of active metal Pt and reduce Sn 4+ The reduction can effectively control the composition of multi-component catalysts, so as to accurately prepare Pt-based multi-component catalysts that are stable at high temperatures, low carbon deposition coverage and good durability. The catalyst prepared by the invention has high-efficiency propane dehydrogenation performance and propylene selectivity, provides an efficient catalyst for the propane dehydrogenation technology, and thus can promote the rapid and healthy development of the propane dehydrogenation technology.

Description

technical field [0001] The invention belongs to the field of industrial catalyst preparation, and in particular relates to a Pt-based multi-component catalyst, a preparation method thereof and its application in propane dehydrogenation to propylene. Background technique [0002] Propylene is a very important chemical intermediate used in the production of various bulk chemicals and materials, including polypropylene, propane oxides (acetone, propylene oxide, acrylic acid, etc.) and acrylonitrile. There has always been a huge gap in my country's propylene market, and it is expected that the gap between supply and demand will reach 4.334 million tons per year by the end of 2020. Therefore, there is a growing demand for propylene in the modern petrochemical industry. [0003] Traditional industries produce large amounts of propylene through steam cracking and flow catalytic cracking of naphtha and gas oil. At present, about 61% of propylene is obtained through naphtha crackin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/648B01J23/62B01J23/63B01J35/02C07C11/06C07C5/333
CPCB01J23/626B01J23/63B01J23/6482B01J23/6486B01J35/0066B01J35/023C07C5/333C07C11/06Y02P20/52
Inventor 朱海波罗鹏阳鲍晓军白正帅岳源源王廷海
Owner FUZHOU UNIV
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