Na₂HPO₄-modified NaY nanocrystallites: efficient catalyst for acrylic acid production through lactic acid dehydration

Abstract

An acrylic acid yield of 74.3% and a formation rate of 12.0 mmol gcat−1 h−1 have been achieved at 340 °C by lactic acid dehydration over Na2HPO4-modified NaY nanocrystallites (NaY-n) due to appropriate surface acidity together with the unique structural features of NaY-n.

Synthesis and characterization of mesoporous aluminas with different pore sizes: Application in NiMo supported catalyst for hydrotreating of heavy gas oil

“…4c. All spectra show the presence of sharp bands at 1445 cm −1 corresponding Lewis site (interaction of pyridine with Al 3+ ions) [38]. The band corresponding to Bronsted acid sites (pyridinium ion) at 1540 cm −1 is present in all catalysts except NiMo/Meso-Al-0.2, but it is weak and broad.…”

Deactivation behavior of alkali-metal zeolites in the dehydration of lactic acid to acrylic acid

“…In addition, zeolites modified by alkali-metal salts have been used as catalysts [14][15][16][24][25][26][27]. In this way, high acrylic acid selectivity could be observed, reaching up to 68% in the case of K-modified Y zeolite [15] and up to 72% for a phosphate-loaded Na-Y zeolite [14,28].…”

Highly efficient and robust Mg0.388Al2.408O4 catalyst for gas-phase decarbonylation of lactic acid to acetaldehyde

“…(4) and (5 [18,[52][53][54]. In this section, effect of preparation parameters such as pH values, calcination temperatures and Mg/Al molar ratios on the specific surface, pore volume and pore distribution of the catalysts was investigated with nitrogen adsorption-desorption at 77 K using Autosorb IQ instrument, and the results were depicted in Tables 1-3 and Figs.…”

“…Carbon monoxide is also used to synthesize propionaldehyde and other aldehydes through hydroformylation reaction of ethylene and other alkenes [14][15][16][17]. As a platform molecule, LA is utilized to produce many value added chemicals such as acrylic acid [18][19][20][21][22][23], acetaldehyde [8], 2,3-pentanedione [24,25], propionic acid [26], pyruvic acid [27] and polylactic acid [28]. Except for corn starch, rich and inexpensive biomass materials such as cellulose [29], sugars [30], and sorbitol [31] have also been used to produce LA.…”