Optimizing the Properties of an Alumina Support of Hydrotreating Catalysts by Introducing Boron and Sulfur at the Stage of Obtaining Pseudoboehmite by Hydrothermal Treatment of the Product Produced by Flash Calcination of Gibbsite

A Review on the Role of Amorphous Aluminum Compounds in Catalysis: Avenues of Investigation and Potential Application in Petrochemistry and Oil Refining

“…Currently, amorphous compounds play an ambiguous role in petrochemistry [4][5][6][7][8][9][10][11][14][15][16][17]19,[26][27][28][29][41][42][43][44][45][46][47][48][49]54,62,[66][67][68][69][70][71][72][73][74][75][76][77][78][79]. They are often considered as an undesirable component of heterogeneous alumina catalysts, since they are inevitably formed during the synthesis methods of aluminum hydroxides (precipitation and alcohol technology) [6,9,11,17,37,45,58,…”

“…A growing body of literature has studied the hydrothermal treatment of amorphous aluminum compounds due to the properties of final products and surface properties of phase compositions, which can be modified toward the crystallization [46,[54][55][56][57][58][59][60][61][62][63][64][65][66]. The main conditions that affect the phase composition of the obtained products are saturated vapor temperature and pressure.…”

“…The mechanism of crystal rise in boehmite under hydrothermal impact depends on the initial pH of the aqueous suspension. Small embryos are formed in the acidic environment, which form a fibrillar structure after coagulation [58]. The particle size of aluminum monohydroxide depends on the rate of nucleation.…”