Synthesis of amorphous mesoporous aluminophosphate materials with high thermal stability using a citric acid route

Abstract

Amorphous mesoporous aluminophosphate materials synthesized from precursors of Al(NO3)3/H3PO4/NH4OH in the presence of citric acid, exhibit high specific surface areas, narrow pore size distributions and excellent thermal stabilities.

Photocatalytic H2 and O2 evolution over tungsten oxide dispersed on silica

“…WO 3 /SiO 2 with different WO 3 contents were prepared with a sol-gel method in the presence of citric acid, which has been proved previously an effective method for the synthesis of thermally stable mesoporous aluminophosphate materials or mesoporous silica-based materials [23,24]. The detailed process is as following.…”

Synthesis and pore formation study of amorphous mesoporous aluminophosphates in the presence of citric acid

“…The porous silica network can form during heating despite the existence of CA [26]. In our preliminary work, an amorphous mesoporous aluminophosphate (AlPO) with high thermal stability was obtained in the presence of citric acid [27]. To our knowledge, CA can coordinate with Al 3+ species to form relative stable Al-CA complexes under appropriate conditions [28].…”

Aluminum Phosphate Catalyzed Free Solvent Preparation of β-enamino Esters

“…In a 100 mL three-neck round bottom flask, A lCl 3 .6H 2 O (7.5 mmo l), and 4 mL of H 3 PO 4 (37 %) are introduced dropwise with stirring at room temperature [28][29][30][31][32][33][34][35]. A fter 30 min, 2.3 mL of ammon ia solution (24 %) was added dropwise to precipitate aluminu m phosphate at a pH of 9.0.…”

“…A lu min u m phosphate is of great interest in environmental, technological fields [20][21][22][23][24][25][26][27] and catalytic reactions [21][22][23][24][25][26][27]. It can be easily p repared by means o f a so l-gel p roto co l [28][29][30][31][32][33][34][35]. The prepared AlPO 4 Materials have high density of Brönsted acid sites making them part icularly suitab le as heterogeneous catalysts for d ifferent organ ic synthesis reactions [34][35].…”