The isopropylation of biphenyl over transition metal substituted aluminophosphates: MAPO-5 (M: Co and Ni)

Zhang, Hui Xing, Chokkalingam, Anand, Subramaniam, Priya V., Joseph, Stalin, Takeuchi, Seiji, Wei, Ming Deng, Al-Enizi, Abdullah M., Jang, Hoi-Gu, Kim, Jong-Ho, Seo, Gon, Komura, Kenichi, Sugi, Yoshihiro and Vinu, Ajayan (2016) The isopropylation of biphenyl over transition metal substituted aluminophosphates: MAPO-5 (M: Co and Ni). Journal of Molecular Catalysis A: Chemical, 412 117-124. doi:10.1016/j.molcata.2015.11.006

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Author Zhang, Hui Xing
Chokkalingam, Anand
Subramaniam, Priya V.
Joseph, Stalin
Takeuchi, Seiji
Wei, Ming Deng
Al-Enizi, Abdullah M.
Jang, Hoi-Gu
Kim, Jong-Ho
Seo, Gon
Komura, Kenichi
Sugi, Yoshihiro
Vinu, Ajayan
Title The isopropylation of biphenyl over transition metal substituted aluminophosphates: MAPO-5 (M: Co and Ni)
Journal name Journal of Molecular Catalysis A: Chemical   Check publisher's open access policy
ISSN 1381-1169
Publication date 2016-02-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.molcata.2015.11.006
Open Access Status File (Author Post-print)
Volume 412
Start page 117
End page 124
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
The isopropylation of biphenyl (BP) was examined over transition metal substituted aluminophosphates (MAPO-5; M: Co and Ni) with 12-membered (12-MR) oxygen ring pore-entrances of AFI topology. The MAPO-5 samples were synthesized by dry gel conversion method using trimethylamine as a structure directing agent, and their properties were characterized by XRD, XPS, SEM, N2 adsorption, NH3-TPD, pyridine adsorption, and o-xylene uptake. They are clear crystals without impurity phases and agglomerates, and found small amounts of Brønsted acid sites which are expecting active for acid catalysis. The isopropylation of BP over both of Co(5)APO-5 and Ni(5)APO-5 at 250 °C gave the high selectivities for 4,4′-DIPB: 65–75%. 4-IPBP is almost exclusive precursor of 4,4′- and 3,4′-DIPB. 3-IPBP was not significantly concerned even though 3-IPBP was predominant among IPBP isomers at the late stages: the MAPO-5 channels allow preferential access of 4-IPBP, and prevent the access of 3-IPBP due to reactant selectivity mechanism. The selective formation of 4,4′-DIPB occurred by preferential exclusion of bulkier 3,4′-DIPB and other isomers through the steric interaction of transition states with the channels by the restricted transition state selectivity mechanism. MAPO-5 (M: Co and Ni) has the same level of the selectivities for 4,4′-DIPB to SSZ-24 and other MAPO-5 (M: Si, Mg, and Zn), and these selectivities were originated by the AFI channels. The selectivities for 4,4′-DIPB were kept 65–75% at low and moderate temperatures over MAPO-5 (M: Co and Ni); however, they were decreased by the isomerization to stable 3,4′-DIPB with the increase in temperature.
Keyword CoAPO-5
AFI topology
Shape-selective catalysis
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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Created: Thu, 21 Jan 2016, 01:27:23 EST by Chris Ende on behalf of Aust Institute for Bioengineering & Nanotechnology