Highly monodispersed palladium-ruthenium alloy nanoparticles assembled on poly(N-vinyl-pyrrolidone) for dehydrocoupling of dimethylamine-borane: An experimental and density functional theory study
Authors: Ay≈üenur Ayg√ºn
Betul Sen
Mehmet Ferdi Fellah
Fatih Sen
Mehmet Harbi Calimli
Journal: Journal of Colloid and Interface Science (2019)
Discipline: CHEMISTRY
Keywords: Dehydrocoupling; Poly(N-vinyl-pyrrolidone) (PVP); density functional theory (DFT); dimethylamine‚Äìborane (DMAB) Monodispersity; turnover frequency (TOF).
Affiliations: Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupƒ±nar University, Evliya √áelebi Campus, 43100 K√ºtahya, Turkey., Department of Chemical Engineering, Bursa Technical University, Mimar Sinan Campus, 16310 Bursa, Turkey., Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupƒ±nar University, Evliya √áelebi Campus, 43100 K√ºtahya, Turkey; Medical Services and Technical Department of Tuzluca Vocational School, Igdir University, Igdir, Turkey., Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupƒ±nar University, Evliya √áelebi Campus, 43100 K√ºtahya, Turkey. Electronic address: .

Abstract:  This study reports on one of the best heterogeneous catalysts for the dehydrogenation of dimethylamine-borane (DMAB). This new catalytic system consists of highly monodisperse Pd and Ru alloy nanoparticles supported by poly(N-vinyl-pyrrolidone) (PdRu@PVP). The prepared heterogeneous catalyst can be reproducibly formed using an ultrasonic reduction technique for DMAB dehydrogenation under mild conditions. For the characterization of PdRu@PVP nanomaterials, several spectroscopic and microscopic techniques were used. The prepared PdRu@PVP nanomaterials with an average particle size of 3.82 ¬± 1.10 nm provided an 808.03 h-1 turnover frequency (TOF) in the dehydrogenation of DMAB and yielded 100% of the cyclic product (Me2NBH2)2 under mild conditions. Furthermore, the activities of catalysts were investigated theoretically using DFT-B3LYP calculations. The theoretical results based on density functional theory were in favorable agreement with the experimental data. 

Retracted: No

PubPeer comments:
 This paper is one of a set of at least 14 papers by the same research group that all appear to share the same photo. In all papers, this photo is used as a zoomed-in inset representing the high-resolution transmission electron microscopy (HRTEM) analysis of the  atomic lattice fringe and particle size of the nanoparticles. Of concern, the same photo, which I have called  Inset 2 , is used to represent a different type of nanoparticle in each of these papers. Here is a collage of 6 different uses of  Inset 2 :  Here is a list of the 14 papers identified so far that all use this photo, and the different types of nanoparticles that they represent. * Betuu0308l Celik et al. - DOI: 10.1016 j.ijhydene.2015.12.138 - Pt(0) DOA@CNT * Betuu0308l Su0327en et al. - DOI: 10.1016 j.ijhydene.2017.05.115 - PdeNi@PEDOT * Betuu0308l Su0327en et al. - DOI: 10.1016 j.ijhydene.2017.06.032 - RuCo@G-MWCNT * Betuu0308l Su0327en et al. - DOI: 10.1016 j.ijhydene.2017.04.213 - RuPtNi@GO * Betuu0308l Su0327en et al. - DOI: 10.1016 j.ijhydene.2017.05.113 - PdNi@GO * Betuu0308l Su0327en et al. - DOI: 10.1016 j.ijhydene.2017.05.112 - Pt@PANI-rGO * Betuu0308l Su0327en et al. - DOI: 10.1016 j.jcis.2018.03.004 - PtNPs@CBH * Betuu0308l Su0327en et al. - DOI: 10.1016 j.jcis.2019.03.057 - PdRu@PVP * Betuu0308l Su0327en et al. - DOI: 10.1016 B978-0-08-102509-3.00002-X - Pd-Ni@AC * Birguu0308tay Su0327ahin et al. - DOI: 10.1016 j.jbiotec.2017.09.012 - Pomegranate Ag NPs * Enes Demir et al. - DOI: 10.1016 j.nanoso.2017.08.018 - Mw-Pt NPs@GO * Enes Demir et al. - DOI: 10.1016 j.nanoso.2017.06.003 - Pt@f-MWCNT * Suleyman Akocak et al. - DOI: 10.1016 j.nanoso.2017.06.002 - Pd@GO * Yagmur Koskun et al. - DOI: 10.1016 j.aca.2018.01.035 - Ni-Pd@AC Of note, this is a different set of papers than the 30 papers by the same group that all appear to use another HRTEM image called  Inset 1 . For an example of that photo and the list of those 30 papers, see DOI 10.1016 j.ijhydene.2018.03.175 https: pubpeer.com publications 8AD71F4A32472314CCE9983D47E36F Here is Figure 1 from this paper, showing the  Inset 2 photo.  ,