Hexagonal boron nitride: A metal-free catalyst for deep oxidative desulfurization of fuel oils

A current overview of the oxidative desulfurization of fuels utilizing heat and solar light: from materials design to catalysis for clean energy

“…In contrast to previous works, ball-milling and thermal treatment were recently utilized by Wu and co-workers to construct h-BN. 217 The prepared h-BN exhibited a lower porosity and specific surface area compared to previous reports owing to the absence of a solvent to function as the pore builder during the pyrolysis stage. Even so, 99.4% of DBT was converted to its oxidized form in the ODS test within 180 min at 80 1C.…”

Hydroxylated boron nitride materials: from structures to functional applications

“…The treatment can generate some other defects in HO-BNs. If the temperature reaches 1500°C, the products have to be hydroxylated by the above methods [47][48][49][50][51][52][53] h-BNNSs Sonication-assisted exfoliation It is a facile method to directly exfoliate BN bulk into HO-BNNSs The hydroxyl degree is relatively low For a high hydroxyl degree, some additives have to be introduced, such as, acid, base, salt, etc [31,[55][56][57][58][59][60][61][62][63] Ball-milling-assisted exfoliation Situations similar to ''sonication-assisted exfoliation'' [64][65][66][67][68][69][70][71][72] Hummer's-like routes The use of strong oxidants (i.e., H 2 SO 4 , H 2 O 2 , KMnO 4 , and their mixtures) requires an extra attention Sometimes the oxidization process can lead to the presence of a few by-products of BN dots [73][74][75][76] Multi-step functionalization method It can be divided into two stages: one is from BN to BNNS and then to HO-BNNS, the other is from BN to HO-BN and then to HO-BNNS [82][83][84][85][86][87][88][89][90][91][92] Bottom-up routes It generally requires high temp...…”

“…Bottom-up synthesis routes are also popular for the preparation of hydroxylated BNs. As summarized in Table 1, the resulted products can be divided into two categories: (i) HO-BNs directly obtained via heating temperature in the range of 850-1100°C [47][48][49][50][51]; (ii) h-BNs hydroxylated via post-processing at the temperature of 1500°C [52,53].…”

Preparation of bimetal modified HMS molecular sieve and its desulfurization performance mechanism

“…Common catalysts are H 2 O 2 /organic acid, H 2 O 2 /organic acid ionic liquid, H 2 O 2 /polyoxometalate, metal oxide, and molecular sieve. [ 18–48 ] Oxidative desulfurization technology is to use a strong oxidant under the action of the catalyst thiophene sulfide oxidation for the corresponding sulfone or sulfoxide, and then distillation, solvent extraction or adsorption and other methods to separate the sulfone or sulfoxide, so as to achieve the purpose of desulfurization. For example, the amount of hydrogen peroxide has a great influence on desulfurization.…”