Catalytic condensation of formaldehyde and methyl formate over 12-tungstosilicic compounds

Recent developments in dehydration of glycerol toward acrolein over heteropolyacids

“…Completely cation exchanged materials are inactive 125. Salts of HSiW with alkali or earth alkaline metal cations being replaced by only one proton, e.g., LiH 3 SiW 12 O 40 or Mg 0.5 H 3 SiW 12 O 40 , show high activity in the above mentioned reaction 126. Similarly, the ammonium salt of HPW, unlike its parent acid, has high surface area due to its microporous structure; a high activity and product selectivity in the conversion of methanol to hydrocarbons was registered 127.…”

High-Performance Ni3P/meso-SiO2 for Gas-Phase Hydrogenation of Dimethyl Oxalate to Methyl Glycolate

“…1,2 Most notably, the PGA polymer with high mechanical strength and stiffness is biocompatible and biodegradable in nature, which can be used to form biomedical materials (such as medical absorbable suture) and sustained-release materials of ecology (such as bioplastics, expected to substitute the petrochemical-based plastics). 3,4 The PGA market size was valued at USD 4.05 billion in 2019 and is expected to reach an estimated value of USD 8.30 billion by 2027, 5 which is urgently calling for a highly efficient and cost-effective route for MG production. Currently, MG production is mainly dependent on various noncatalytic and catalytic approaches, such as the carboxylation of formaldehyde, condensation of methyl formate with formaldehyde, and hydrolysis of chloroacetic acid, 6−8 which suffer from poor efficiency, low production capacity (relative to huge PGA market demand), and harsh reaction conditions.…”

“…Methyl glycolate (MG) is a valuable monomer and fine chemical intermediate because of its unique molecular structure with α-H, hydroxyl, and ester groups. It has been widely involved in the synthesis of abundant downstream products, including pharmaceuticals (such as iso-harringtonine and its analogues, which can be used as anticancer drugs), fine chemicals, perfumes, and poly­(glycolic acid) (PGA, a new-generation thermoplastic polymer). , Most notably, the PGA polymer with high mechanical strength and stiffness is biocompatible and biodegradable in nature, which can be used to form biomedical materials (such as medical absorbable suture) and sustained-release materials of ecology (such as bioplastics, expected to substitute the petrochemical-based plastics). , The PGA market size was valued at USD 4.05 billion in 2019 and is expected to reach an estimated value of USD 8.30 billion by 2027, which is urgently calling for a highly efficient and cost-effective route for MG production. Currently, MG production is mainly dependent on various noncatalytic and catalytic approaches, such as the carboxylation of formaldehyde, condensation of methyl formate with formaldehyde, and hydrolysis of chloroacetic acid, − which suffer from poor efficiency, low production capacity (relative to huge PGA market demand), and harsh reaction conditions.…”

Ethanol conversion over cesium-doped mono- and bi-cationic aluminum and gallium H3PW12O40 salts

“…In 1982 AlPW 12 O 40 salt was synthesized by Ono [7] by mixing the aqueous solution of H 3 PW 12 O 40 and Al(NO 3 ) 3 . Besides aluminum nitrate other aluminum compounds were used: Al(i-OC 3 H 7 ) 3 [11], carbonate [12], chloride [9], and AlO(CH 3 COO) 4 [13]. Silviani and Burns [14] modified the synthesis of heteropoly salt by using aluminum sulphate and removed SO 4 2− ions in the form of insoluble BaSO 4 by addition of BaCO 3 and final elimination of CO 3 2− ions by heating.…”