Novel mesoporous aluminosilicate supported palladium-rhodium catalysts for diesel upgrading

Supported Ir–Pd nanoalloys: Size–composition correlation and consequences on tetralin hydroconversion properties

“…Nevertheless, no ROCPs were formed on this catalyst, and the hydrogenation activity was found comparable to that of a reference Pd-Pt catalyst. For the selective opening of one-ring or two-ring hydrocarbons, several other combinations of noble metals have been reported: Ir-Pt [6,10,11,35], Pd-Pt [5,14], Os-Ru [5,9] PdRh [13], and Pt-Rh [36]. However, a frequent limitation of the works dealing with bimetallic catalysts is the poor direct investigation of the nanoparticles structure, allowing determining whether they are themselves bimetallic or whether monometallic particles coexist [37][38][39].…”

“…Although less desirable than ring-opening products in terms of cetane number, such compounds could be important intermediates to ring-opening steps in real feedstocks. Indeed, using bifunctional catalysts, several works have obtained significant cetane number enhancements for prehydrotreated light cycle oil feedstocks [10,13,18].…”

“…However, as a conclusion of several studies using decalin, tetralin, or naphthalene as model molecules [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], it remains challenging to obtain both a resistance to poisoning by sulfur, and a high selectivity ratio between C 10 ring-opening products and C <10 cracking products. Moreover, along with ring-opening products, a large proportion of decalin skeletal isomers (or ''ringcontraction products'') is generally formed.…”

Application of Phase Transfer Catalysis in the Esterification of Organic Acids: The Primary Products from Ring Hydrocarbon Oxidation Processes

“…The increasingly stringent regulation was implemented in 2016: the CN tested by ASTM D 976 is not lower than 40, or the aromatics content tested by ASTM D 1319 is not higher than 35%, which are both required in the Standard Specification for Diesel Fuel Oils ASTM D 975-16a. This has resulted in an increased interest and demand for new or improved processes for enhancing the CN of diesel fuels.Current mainstream technologies for the improvement of CN of diesel distillates are severe hydrogenation to open the rings of aromatics and cycloparaffins by using noble metal catalysts [3][4][5][6][7]. However, there are sulfur or nitrogen compounds in the feed of these deep hydro-ring opening processes, which readily pollute these noble metal catalysts [3,5,6].…”

“…Current mainstream technologies for the improvement of CN of diesel distillates are severe hydrogenation to open the rings of aromatics and cycloparaffins by using noble metal catalysts [3][4][5][6][7]. However, there are sulfur or nitrogen compounds in the feed of these deep hydro-ring opening processes, which readily pollute these noble metal catalysts [3,5,6].…”