Search

A novel and sustainable synthesis of a Pd/CN@MgO catalyst is presented here, offering a bifunctional catalyst with high catalytic activity towards a tandem aldol condensation-hydrogenation reaction of furfural with acetone in a one-pot reactor. The incorporation of biomass based hydrophilic N-containing carbon (CN) in the catalyst provides a subtle but elegant method to control the good water dispersibility, the reaction stability, and the ultrafine dispersion of palladium particles (2.2 nm in average size) in the bifunctional catalyst Pd/CN@MgO. With such improved features, an impressive 99% furfural conversion and 95% selectivity for the hydrogenated products (saturated ketones) was obtained by using Pd/CN@MgO as a novel bifunctional catalyst in the reported tandem reaction. This catalyst design strategy and the high efficiency of the catalyst in the reported system offer potential for the preparation of bi/ multifunctional catalysts and the one-pot synthesis of bioderived intermediates. [ABSTRACT FROM AUTHOR]

Catalytic synthesis of di(methylphenyl)methane (CH3C6H4CH2C6H4CH3, DMPMs) from toluene and formaldehyde were investigated over various solids acids. At 140 °C and toluene/HCHO = 5/1, the conversion of HCHO over zeolite (Hβ, H-mordenite, HX, HY and HZSM-5) is limited, while heteropolyacids (H3PW12O40, H4SiW12O40 and H3PMo12O40) exhibited higher activity and DMPMs selectivity. The best yield of DMPMs reached 81.5% (conversion of HCHO nearly 100%). H3PW12O40 could be recovered by simply drying and the recycle-used catalyst remained its activity and structure in five runs. [ABSTRACT FROM AUTHOR]

Pb, Sb, Bi and Te doped Ni catalysts were prepared and used for methane reforming with CO2 in order to diminish coke deposition. It was found that small amounts of Pb doped Ni catalysts exhibited excellent coke resistance ability with minor loss of the reforming activity. As the added amount of Pb increased from 0 to 0.015 (mole ratio between Pb/Ni), coke formation rate decreased from 166.7 mg-coke/g-cat h (on Ni/SiO2) to 0, while the reforming activity decreased slightly from 73.2% to 63.3% (conversion of CO2) at 800 °C, 60,000 ml(STP)/g-cat·h (CH4 CO2=1:1, no dilution gas in feed). Higher amounts of Pb and Sb, Bi, Te made Ni catalyst deactivated for methane reforming with CO2. [ABSTRACT FROM AUTHOR]

Pb, Sb, Bi and Te doped Ni catalysts were prepared and used for methane reforming with CO2 in order to diminish coke deposition. It was found that small amounts of Pb doped Ni catalysts exhibited excellent coke resistance ability with minor loss of the reforming activity. As the added amount of Pb increased from 0 to 0.015 (mole ratio between Pb/Ni), coke formation rate decreased from 166.7 mg-coke/g-cat h (on Ni/SiO2) to 0, while the reforming activity decreased slightly from 73.2% to 63.3% (conversion of CO2) at 800 °C, 60,000 ml(STP)/g-cat·h (CH4 CO2=1:1, no dilution gas in feed). Higher amounts of Pb and Sb, Bi, Te made Ni catalyst deactivated for methane reforming with CO2. [ABSTRACT FROM AUTHOR]