LETTER TO THE EDITOR FOR THE ARTICLE "SPHERICAL P-MODIFIED CATALYSTS FOR HETEROGENEOUS CROSS-ALDOL CONDENSATION OF FORMALDEHYDE WITH METHYL ACETATE FOR METHYL ACRYLATE PRODUCTION," C. ZUO, C. LI, T. GE, X. GUO, S. ZHANG, CAN. J. CHEM. ENG. 2017, 95, 2104