glycerol to acrolein over a variety of aluminumphosphate (AlP) catalysts synthesized by a simple replacement reaction method with a variation in calcination temperature (300-700 °C, AlP-300, AlP-400, AlP-500, AlP-600, and AlP-700, respectively) has been investigated. The textural properties, acidities and coke contents of the samples were also determined. The catalysts were presented in an amorphous state
Steroid derivatives for the treatment of prostatic hypertrophy their
申请人:Sankyo Company, Limited
公开号:US05536714A1
公开(公告)日:1996-07-16
The invention includes compounds of formula (I): ##STR1## in which R.sup.1 is hydrogen, alkyl, aryl-substituted alkyl or aromatic heterocyclic-substituted alkyl; R.sup.2 is aryl-substituted alkyl, aromatic heterocyclic-substituted alkyl or diarylamino; and R.sup.3 is carboxy or a group of formula --CONHSO.sub.2 R.sup.4 wherein R.sup.4 is alkyl; and pharmaceutically acceptable salts and esters of the compounds. The compounds have valuable 5.alpha.-reductase inhibitory activity and can thus be used for the treatment and prophylaxis of, inter alia, prostatic hypertrophy as well as other disorders arising from excess levels of 5.alpha.-dihydro-testosterone.
Tunable luminescence evolution and energy transfer behavior of Na<sub>3</sub>Sc<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>:Ce<sup>3+</sup>/Tb<sup>3+</sup>/Eu<sup>3+</sup> phosphors
excitation, the energytransfers from Tb3+ to Eu3+ in the NSPO host occurred mainly via a dipole–dipole mechanism, and the critical distances of the ion pairs (Rc) was calculated to be 17.94 Å by the quenching concentration method. And that, the emission colors of the NSPO:Tb3+,Eu3+ phosphors could be adjusted from green through yellow to red because of the energytransfer from Tb3+ to Eu3+. Based on its
作者:Bochuan Song、Diana Choi、Yan Xin、Clifford R. Bowers、Helena Hagelin‐Weaver
DOI:10.1002/anie.202012469
日期:2021.2.19
metal–support interactions and correlations to catalytic activity and selectivity. Here, a modified atomic layer deposition technique was developed to achieve ultra‐lowloadings (8–16 ppm) of Pt on shaped ceria nanocrystals. Using octahedra and cubes, which expose exclusively (111) and (100) surfaces, respectively, the effect of CeO2 surface facet on Pt‐CeO2 interactions under reducing conditions was revealed.
A phosphate-derived bismuth catalyst with abundant grain boundaries for efficient reduction of CO<sub>2</sub> to HCOOH
作者:Yulin Xing、Huihuang Chen、Yan Liu、Yelin Sheng、Jie Zeng、Zhigang Geng、Jun Bao
DOI:10.1039/d0cc06756c
日期:——
A phosphate-derived Bi catalyst (PD-Bi) that is rich in grain boundaries achieved high activity and selectivity towards the electroreduction of CO2 to HCOOH simultaneously.