Anti-carbon-formation chromium-based catalyst for preparing propylene from propane through oxydehydrogenation, and preparation method and application thereof

A carbon-deposited chromium-based propane and catalyst technology, applied in the field of chemical catalysis, can solve problems such as poor stability and deactivation, and achieve the effects of increased catalyst life, high propylene selectivity, enhanced stability and mechanical strength

Active Publication Date: 2018-02-23
DALIAN UNIV OF TECH
View PDF10 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a catalyst for propane dehydrogenation to prepare propylene, aiming at the shortcomings of the catalyst being easy to deactivate due to carbon deposition and poor stability. Alumina [ZL201110196192.4] is the carrier, the Al 2 o 3 There are a lot of hydroxyl unsaturated coordination Al on the surface 3+ (pentacoordination), helps to anchor the active component Cr 2 o 3 , so that Cr 2 o 3 and Al 2 o 3 Form a strong interaction between them, preventing the Cr during the reaction process 2 o 3 agglomeration, suppress side reactions, prevent further dehydrogenation of propylene, and form carbon deposits during polymerization, thereby promoting the catalyst to maintain high propylene selectivity while improving the stability of the catalyst

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Anti-carbon-formation chromium-based catalyst for preparing propylene from propane through oxydehydrogenation, and preparation method and application thereof
  • Anti-carbon-formation chromium-based catalyst for preparing propylene from propane through oxydehydrogenation, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Al with rich unsaturated coordination Al 3+ (Pentacoordination) [ZL201110196192.4] Rod-shaped alumina is used as a carrier, and 129.5gCr(NO 3 ) 3 9H 2 O; 4.38g KNO 3 ; 0.74gCa(NO 3 ) 2 Prepare 200ml solution, immerse shaped alumina in the solution for 50min; remove surface moisture; 600 DEG C muffle furnace roasting 5h; Catalyst (A1) is mixed with 20vol% H at 600 DEG C 2 / N 2 Restoration for 2 hours, only pass through C during the test 3 h 8 . 18%Cr 2 o 3 -1.5%K 2 O-0.14%CaO / Al 2 o 3 , and the evaluation results are shown in Table 1.

Embodiment 2

[0023] Al with rich unsaturated coordination Al 3+ (Pentacoordination) [ZL201110196192.4] Rod-shaped alumina is used as the carrier, and 81.4gCr(NO 3 ) 3 9H 2 O; 2.75g KNO 3 ; 0.46gCa(NO 3 ) 2 Prepare 200ml solution, immerse shaped alumina in the solution for 50min; remove surface moisture; 600 DEG C muffle furnace roasting 5h; Catalyst (A2) is mixed with 20vol% H at 600 DEG C 2 / N 2 Restoration for 2 hours, only pass through C during the test 3 h 8 . 10%Cr 2 o 3 -1.5%K 2 O-0.14%CaO / Al 2 o 3 , and the evaluation results are shown in Table 1.

Embodiment 3

[0025] Al with rich unsaturated coordination Al 3+ (Pentacoordination)【ZL201110196192.4】Rod-shaped alumina is used as the carrier, and 146.6gCr(NO 3 ) 3 9H 2 O; 4.96g KNO 3 Prepare 200ml solution, dip shaped alumina in the solution for 50min; remove surface moisture; 600 DEG C muffle furnace roasting 5h; Catalyst (A3) is mixed with 20vol% H at 600 DEG C 2 / N 2 Restoration for 2 hours, only pass through C during the test 3 h 8 . 18%Cr 2 o 3 -1.5%K 2 O-0.14%CaO / Al 2 o 3 , and the evaluation results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides an anti-carbon-formation chromium-based catalyst for preparing propylene from propane through oxydehydrogenation, and a preparation method and application thereof, belonging tothe technical field of chemical catalysis. According to the invention, rod-like alumina originated from ZL201110196192.4 and rich in unsaturated ligand is used as a carrier; since the surface of the Al2O3 has a great number of hydroxyl unsaturated ligand Al<3+>, the active component Cr2O3 can be better anchored, strong interaction among the Cr2O3 and the Al2O3 is formed, agglomeration of the Cr2O3during a reaction is prevented, side reactions are inhibited, and propylene is prevented from carbon formation due to further dehydrogenation and polymerization; thus, the catalyst is allowed to maintain high propylene selectivity and is improved in stability. Therefore, the Al2O3 used as the carrier is helpful for improving the selectivity and inactivation resistance of the catalyst. Compared with conventional catalysts, the catalyst provided by the invention is high in propylene selectivity, slow in carbon formation and inactivation rates, high in stability and greatly improved in mechanical strength, and has good industrial application prospects.

Description

technical field [0001] The invention relates to a carbon-deposition-resistant chromium-based propane dehydrogenation propylene catalyst, a preparation method and application, and belongs to the technical field of chemical catalysis. Background technique [0002] As one of the basic raw materials in the chemical industry, propylene can be used to produce a series of downstream chemicals such as polymers and olefin oxides. Due to the rapid growth of downstream products in recent years, the demand for propylene is increasing day by day. At present, the catalytic cracking process of petroleum and the steam cracking process of naphtha are the main sources of propylene, but with the increasing shortage of petroleum resources, the traditional propylene production technology has been difficult to meet the rapidly growing demand for propylene, so the development of new propylene production Technology seems to be very urgent. my country's liquefied petroleum gas reserves are huge, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26C07C5/333C07C11/06
CPCB01J23/002B01J23/26B01J2523/00C07C5/3332C07C2523/26B01J2523/13B01J2523/23B01J2523/31B01J2523/67C07C11/06Y02P20/52
Inventor 陆安慧户守昭李文翠
Owner DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap