Influence of process parameters on single bed Ni/(Al)MCM-41 for the production of propene from ethene feedstock. (31st December 2019)

• Record Type: Journal Article
• Authors: Felischak, Matthias; Wolff, Tanya; Alvarado Perea, Leo; Seidel-Morgenstern, Andreas; Hamel, Christof
• Is Part Of: Chemical engineering science. Volume 210(2019)
• Publication Date: 2019-12-31
• Subjects: Catalytic cycle -- Ethene -- Propene -- Nickel catalysts -- AlMCM-41 -- Reaction kinetics; ETP Ethene-to-Propene -- GC Gas chromatography -- HTKR High Temperature Kinetic Reactor -- MCM Mobile composition of matter -- OCT Olefin Conversion Process -- SAPO Small-pore molecular sieves -- SBA Santa Barbara Amorphous material -- W/F Weight-to-Flow -- ZSM Zeolite Socony mobile; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2019.115246
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: Direct production of propene from ethene feedstock using Ni/(Al)MCM-41. Reaction network analysis indicates the occurrence of cracking reaction. Cyclic reactor operation is suggested, including deactivation and regeneration. A single catalyst bed was applied for more than 2000 h on stream. Abstract: A Ni aluminized mesoporous MCM-41 catalyst was prepared and applied for the direct conversion of ethene to propene. Suitable ethene conversion and good selectivity for the desired molecule propene were achieved. The catalyst placed in a packed tubular reactor was stable for more than 2000 h with time on stream. A reaction network analysis was performed evaluating the product spectrum observed covering a large range of operating conditions. Thereby, temperature and feed concentration can be considered as significant influence parameters on the product distribution. Based on the product spectra, a modified reaction network including a catalytic cycle is suggested, which adds cracking of long-chain olefins to the conventionally considered dimerization/oligomerization and isomerization steps. Following previous publications, the catalyst presented strong deactivation behavior. It was observed that the regeneration conditions (oxygen concentration and regeneration time) are crucial parameters concerning long-time stability. Finally, a cycling reactor operation of deactivation-regeneration steps is suggested.