Revealing the Effect of Mass Transfer on Direct Dehydrogenation of Ethylbenzene Catalyzed by Phosphorous‐doped Boron Nitride: Comparative Study. Issue 2 (20th December 2021)

• Record Type: Journal Article
• Authors: Liu, Yuwei; Xu, Fan; Yuan, Nicui; Lin, Baining; Zhou, Yonghua
• Is Part Of: ChemCatChem. Volume 14:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-20
• Subjects: Direct dehydrogenation -- Metal-free catalyst -- Phosphorous-doped boron nitride -- Styrene -- Thiourea; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202101676
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Phosphorous‐doped boron nitride (PBN) was previously confirmed to be an effective metal‐free catalyst for the challenging topic of ethylbenzene direct dehydrogenation (DDH) to styrene. Here, the effect of mass transfer factors including the porosity and surface exposure degree of mesoporous‐PBN (m‐PBN) on its performance over DDH was investigated by control experiments. The central pore size of m‐PBN was closely dependent on the thiourea amount and heating rate. The m‐PBN with optimal pore size delivered a significantly improved styrene production rate of 21.47 mmolST g −1 h −1 and styrene selectivity over 98 %. Further, when m‐PBN was in‐situ grown on cordierite, the activity and stability of catalyst could be further enhanced to 27.08 mmolST g −1 h −1 for 50 h stable run, which presented a promising industrial application prospect. This paper justified that the mass transfer factors involved in two‐dimensional metal‐free catalysts were crucial for DDH of ethylbenzene. Abstract : Direct dehydrogenation : The m‐PBN in‐situ grown on cordierite delivered the significantly improved performance in non‐steam direct dehydrogenation of ethylbenzene, with styrene production rate of 27.08 mmolST g −1 h −1, styrene selectivity of 98.07 % and 50 h stable run, due to the better mass transfer conditions.