TY - JOUR
T1 - Acrylic acid synthesis from lactic acid over hydroxyapatite catalysts with various cations and anions
AU - Matsuura, Yumiko
AU - Onda, Ayumu
AU - Ogo, Shuhei
AU - Yanagisawa, Kazumichi
PY - 2014/5/1
Y1 - 2014/5/1
N2 - We prepared substituted hydroxyapatite catalysts, such as Ca 10(PO4)6(OH)2, Sr 10(PO4)6(OH)2, Pb 10(PO4)6(OH)2, Ca 10(VO4)6(OH)2, and Sr 10(VO4)6(OH)2, and carried out conversions of lactic acid over the prepared catalysts. The hydroxyapatite catalysts had stabilities for the reaction media under flowing gas including lactic acid and water at 623 K. The hydroxyapatite catalysts exhibited markedly higher acrylic acid yields than those of P2O5/SiO 2 and MgO catalysts. In the lactic acid conversions, the relatively acidic catalysts, such as P2O5/SiO2, Ca 10(VO4)6(OH)2 and Sr 10(VO4)6(OH)2 catalysts, accelerated the formations of acetaldehyde and propionic acid, whereas the relatively basic catalysts, such as MgO and Pb10(PO4)6(OH) 2 catalysts, gave large amounts of unidentified products. On the other hand, the moderate acid-base catalysts, such as Ca10(PO 4)6(OH)2 and Sr10(PO 4)6(OH)2 catalysts, selectively accelerated the dehydration of lactic acid into acrylic acid.
AB - We prepared substituted hydroxyapatite catalysts, such as Ca 10(PO4)6(OH)2, Sr 10(PO4)6(OH)2, Pb 10(PO4)6(OH)2, Ca 10(VO4)6(OH)2, and Sr 10(VO4)6(OH)2, and carried out conversions of lactic acid over the prepared catalysts. The hydroxyapatite catalysts had stabilities for the reaction media under flowing gas including lactic acid and water at 623 K. The hydroxyapatite catalysts exhibited markedly higher acrylic acid yields than those of P2O5/SiO 2 and MgO catalysts. In the lactic acid conversions, the relatively acidic catalysts, such as P2O5/SiO2, Ca 10(VO4)6(OH)2 and Sr 10(VO4)6(OH)2 catalysts, accelerated the formations of acetaldehyde and propionic acid, whereas the relatively basic catalysts, such as MgO and Pb10(PO4)6(OH) 2 catalysts, gave large amounts of unidentified products. On the other hand, the moderate acid-base catalysts, such as Ca10(PO 4)6(OH)2 and Sr10(PO 4)6(OH)2 catalysts, selectively accelerated the dehydration of lactic acid into acrylic acid.
KW - Acid-base properties
KW - Acrylic acid
KW - Hydroxyapatite
KW - Lactic acid
UR - http://www.scopus.com/inward/record.url?scp=84897621569&partnerID=8YFLogxK
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U2 - 10.1016/j.cattod.2013.10.031
DO - 10.1016/j.cattod.2013.10.031
M3 - Article
AN - SCOPUS:84897621569
SN - 0920-5861
VL - 226
SP - 192
EP - 197
JO - Catalysis Today
JF - Catalysis Today
ER -