Loaded catalyst for propane dehydrogenation to propylene and preparation method thereof

A supported catalyst, propane dehydrogenation technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc. Poisoning and deactivation problems, to achieve excellent catalytic stability, improve stability and service life, and wide applicability

Active Publication Date: 2019-08-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Precious metal platinum catalysts have high activity and stability in propane dehydrogenation, but they are expensive and prone to poisoning and deactivation; chromium catalysts are cheap and have relatively low requirements for impurities in raw materials, and the production of propylene by direct dehydrogenation of propane has been realized industrially In the process, Catofin, Linde, and FBD processes all use chromium-based catalysts
However, the carrier used in industrial chromium catalysts is active γ-Al 2 o 3 , the catalyst carrier is prone to sintering or crystal phase transformation to generate α-Al during t

Method used

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  • Loaded catalyst for propane dehydrogenation to propylene and preparation method thereof
  • Loaded catalyst for propane dehydrogenation to propylene and preparation method thereof
  • Loaded catalyst for propane dehydrogenation to propylene and preparation method thereof

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Embodiment 1

[0029] Preparation of La by precipitation method 2 o 3 6Al 2 o 3 Carrier, weigh lanthanum nitrate and aluminum nitrate according to the atomic ratio of La: Al in the chemical formula and dissolve them in deionized water. After stirring for 25 minutes, slowly add an aqueous solution of ammonium carbonate to form a milky white precipitate. After continuing to stir for 120 minutes, filter and wash the filtered solid The material was dried overnight in a 100°C oven. The dried powder was calcined in a muffle furnace at 1000°C for 3 hours to obtain a white powder with a specific surface area of ​​120m 2 / g.

Embodiment 2

[0031] The La prepared by embodiment 1 2 o 3 6Al 2 o 3 The carrier is used in the impregnation method to synthesize loaded Cr 2 o3 catalyst. Weigh a certain amount of chromium nitrate and dissolve it in deionized water, add La 2 o 3 6Al 2 o 3 Carrier, where Cr 2 o 3 The loading amount is 15wt%. Heat and stir until the solution evaporates to dryness, and dry the solid material in an oven at 100°C overnight. The dried powder was calcined in a muffle furnace at 500° C. for 6 hours to obtain a light green powder supported catalyst.

Embodiment 3

[0033] The loaded Cr prepared by embodiment 2 2 o 3 (15wt%) / La 2 o 3 6Al 2 o 3 The catalyst is used in the direct dehydrogenation of propane to propylene. Weigh 1g of 20-30 mesh catalyst, the reaction raw material gas is pure propane, the reaction pressure is normal pressure, the reaction temperature is 600°C, and the reaction space velocity is 320ml·g -1 h -1 . The result of the reaction is as figure 1 shown. With industrial Cr in comparative example 1 2 o 3 / Al 2 o 3 Catalyst comparison ( Figure 5 ), the propane conversion and propylene selectivity of the catalyst are close to those of industrial catalysts, showing high propane dehydrogenation activity and selectivity.

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Abstract

The invention aims to provide a loaded catalyst for propane dehydrogenation to propylene and a preparation method thereof. The catalyst consists of a Cr2O3 active component and a carrier material withhigh temperature sintering resistance, phase change resistance and high specific surface at high temperature. The chemical formula of the catalyst is yCr2O3/MaOb.xAl2O3, y=10-30%, a=1-3, b=1-4; x=4-8, and the carrier material is metal doped aluminum oxide salt MaOb.xAl2O3. Precipitation technique, complexing technique, sol-gel technique or reverse micro-emulsion technique is employed to prepare the carrier material MaOb.xAl2O3 with high temperature sintering resistance, phase change resistance and high specific surface; impregnation process and solid phase ball mill mixing technique are adopted to prepare the yCr2O3/MaOb.xAl2O3 loaded catalyst, y=10-30%, and the Cr2O3 active component precursor material adopts chromium nitrate, chromium acetate, chromium citrate, chromium acetylacetonateand other chromium-containing precursors. The synthesized loaded catalyst shows good catalytic activity in the reaction of direct dehydrogenation of alkane to prepare propylene, especially shows excellent sintering and phase change resistance, thus greatly improving the stability and service life of the catalyst.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a supported catalyst for propane dehydrogenation to propylene and a preparation method thereof. Background technique [0002] Propylene is an important organic petrochemical basic raw material second only to ethylene, and is widely used in the production of very important chemical products such as polypropylene, propylene oxide, and acrylic acid. In recent years, with the rapid increase in the demand for downstream derivatives of propylene, the supply gap of propylene resources has become increasingly apparent. [0003] At present, the vast majority of propylene comes from steam cracking and catalytic cracking in refineries. However, steam cracking is limited by the ratio of propane-ethane co-production, and catalytic cracking is restricted by the further production of high-octane gasoline from light hydrocarbons. Traditional The existing propylene production technol...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01J37/03B01J37/02C07C11/06C07C5/333
CPCB01J23/002B01J23/26B01J37/0201B01J37/031B01J2523/00C07C5/3332C07C11/06B01J2523/31B01J2523/3706B01J2523/67B01J2523/25B01J2523/48B01J2523/12Y02P20/52
Inventor 杨维慎张宝春楚文玲阎嘉华王红心马国民刘延纯
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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