Development of Magnesium Oxide–Zeolite Catalysts for Isomerization of Fatty Acids
Tóm tắt
Three zeolites were treated with magnesium nitrate hexahydrate (Mg(NO3)2⋅6H2O) salt to generate active magnesium oxide (MgO)–zeolite catalysts for the isomerization of oleic acid to give the iso-oleic acid (precursor of isostearic acid). Isostearic acid is a crucial component used in the formulation of bio-lubricants including cosmetic and personal care products. The treatment step is intended to poison (or neutralize) the external acid sites of the zeolites, thus inhibiting the formation of by-products (i.e., dimer fatty acids). The acid sites, crystallinity, thermal property, morphology and elemental composition of the zeolites before and after treatments were investigated by scanning electron microscopy, fourier-transform spectroscopy, thermogravimetric analysis, and x-ray powder diffraction. In addition, the effect of a calcination step after treatment was examined to determine if this step was necessary to obtain an active and stable catalyst. As expected, the higher the concentration of MgO on the zeolites, the less dimer was detected in the isomerization products, while the conversion of oleic acid and selectivity of iso-oleic acid remained at a relatively high level. This is promising because the MgO has deprotonated the external acids of the zeolites to generate a high purity isostearic acid that is potentially suitable for personal care products.
Tài liệu tham khảo
Ngo H, Foglia TA (2014) US Patents 8,748,641, 10 Jun 2014
Zhang S, Zhang Z, Steichen D (2005) US Patents 6,946,567, 20 Sept 2005
Tomifuji T, Abe H, Matsumura Y, Sakuma Y (1997) US Patents 5,677,473, 14 Oct 1997
Canter N (2009) Tribol Lubr Technol 65:10
Nelson L (2007) Tribol Lubr Technol 63:32
Aungst BJ (1989) Pharm Res 6:244
Hibino T, Niwa M, Murakami Y (1993) Zeolites 13:518
Pinar A, Marquez-Alvarez C, Grande-Casas M, Perez-Pariente J (2009) J Catal 263:258
Xu W-Q, Yin Y-G, Suib SL, Edwards JC, O’Young C-L (1996) J Catal 163:232
Müller M, Harvey G, Prins R (2000) Microporous Mesoporous Mater 34:135
Rachwalik R, Olejniczak Z, Sulikowski B (2005) Catal Today 101:147
Hu Z, Wei L, Dong J, Wang Y, Chen S, Peng S (1999) Microporous Mesoporous Mater 28:49
Ngo HL, Hoh E, Foglia TA (2012) Eur J Lipid Sci Technol 114:213
Ngo HL (2014) Eur J Lipid Sci Technol 116:645
Ngo HL (2015) J Am Oil Chem Soc 92:613
Ramesh K, Jie C, Han Y-F, Borgna A (2010) Ind Eng Chem Res 49:4080
Rachwalik R, Olejniczak Z, Jiao J, Huang J, Hunger M, Sulikowski B (2007) J Catal 252:161
Chen CSH, Tabak SA (1986) US Patents 4,568,786, 4 Feb 1986
Chen CS (1987) US Patents 4,716,135, 29 Dec 1987
Blain DA, Page NM, Young LB (1991) US Patents 5,026,933, 25 Jun 1991
Emana AN, Chand S (2015) Appl Petrochem Res 5:121
Guo X, Shen J-P, Sun L, Song C, Wang X (2003) Catal Lett 87:25
Sarker MI, Latona RJ, Moreau RA, Micheroni D, Jones KC, Ngo HL (2017) Eur J Lipid Sci Technol 119:1700262
Jae J, Tompsett GA, Foster AJ, Hammond KD, Auerbach SM, Lobo RF, Huber GW (2011) J Catal 279:257
Kustov LM (1997) Top Catal 4:131
Jentys A, Lercher JA (2001) In: van Bekkum H, Flanigen EM, Jacobs PA, Jansen JC (eds) Introduction to zeolite science and practice, vol 137. Elsevier, Amsterdam