The effect of modifying alumina with sulfate and phosphate on the catalytic properties of Mo/Al2O3 in HDS reaction

Effects of Citric Acid Addition Method on the Activity of NiMo/γ-Al2O3 Catalysts in Simultaneous Hydrodesulfurization and Hydrodenitrogenation Reactions

“…There were also significant changes in product distribution because BP yield was favored over CHB (Figure b), indicating a stronger inhibition of HYD route. Hence, even though quinoline inhibits both DDS and HYD routes, the HYD sites are preferentially poisoned by the nitrogen compound, as already previously reported in the literature. ,− …”

Kinetic and thermodynamics of the removal of Zn2+ and Cu2+ from aqueous solution by sulphate and phosphate-modified Bentonite clay

“…However, modification with phosphate and sulphate anions decreased the specific surface area of pristine Bentonite clay. This has also been observed by Kim and Woo [18], Unuabonah [25], and Li et al [14]. It is possible the aggregation of clay particles in the presence of sulphate and phosphate (as observed from the better flocculation of the clay mineral in solution) could have decreased the specific surface area of the adsorbents as suggested by Liu and González [26].…”

“…Thus, phosphate anion may be strongly adsorbed onto Bentonite clay via an inner-sphere mechanism (through its less-hindered site) and also by formation of Al-phosphate surface precipitates [15,18,42]. This is supported with a proposed reaction scheme as shown in Fig.…”

“…Preadsorbed phosphates and sulphate anions onto soils and several other surfaces have been 0304-3894/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jhazmat.2010.08.100 studied before now [14][15][16][17][18][19]. However, there are no reports on the adsorption dynamics of phosphate and sulphate-modified Bentonite clay in the removal of Zn 2+ and Cu 2+ from aqueous solution.…”

Enhanced Activity of Heterogeneous Pd(II) Catalysts on Acid-Functionalized Metal–Organic Frameworks

“…Single-site heterogeneous catalysts (SSHCs) supported on solid substrates have helped develop strategies for designing efficient catalysts by facilitating the determination of the location of active sites and the mechanism of catalytic cycles. − Because SSHCs largely improve atom economy and energy efficiency, some SSHCs have already been synthesized on an industrial scale and commercialized. − Recently, SSHCs supported on acidic oxides have received significant attention as a result of their unique catalyst–support interactions provided by the presence of strong Brønsted and Lewis acidic sites on the support’s surface. − For example, organometallic catalysts anchored on sulfated oxides yield “cationic” metal centers which exhibit higher activities in olefin polymerization and olefin hydrogenation compared to the organometallic catalyst or oxide analogue alone. , Various metal oxides, including zirconia, − iron oxide, alumina, , and titania, , have been acidified by sulfation or phosphation to support SSHCs.…”