Novel hydrogen chemisorption properties of amorphous ceramic compounds consisting of p-block elements: exploring Lewis acid–base Al–N pair sites formedin situwithin polymer-derived silicon–aluminum–nitrogen-based systems

Abstract

This paper reports the relationship between the H2 chemisorption properties and reversible structural reorientation of the possible active sites around Al formed in situ within polymer-derived ceramics (PDCs) based on an amorphous Si–Al–N system.

The Al(iii)-based polydentate chelate complex catalyzed cycloaddition of carbon dioxide and epoxides: synthetic optimization and mechanistic study

“…S5,† CO 2 -TPD indicated the physical adsorption of the as-synthesized catalyst for CO 2 at 90 °C. 43,44 In addition, no other forms of CO 2 adsorption were found in the range 50–200 °C.…”

Downshift of the Ni d band center over Ni nanoparticles in situ confined within an amorphous silicon nitride matrix

“…The as-received PSZ as a reference (black line in Fig. 1(a)) presents the typical absorption bands of poly(vinylmethyl- co -methyl)silazane; 3379 ( ν N–H), 3048 ( ν C sp 2 –H), 2957 ( ν C sp 3 –H), 2899 ( ν C sp 3 –H), 2120 ( ν Si–H), 1592 ( ν CC), 1403 ( δ C sp 2 –H, vinyl), 1254 ( δ Si-CH 3 ), 1161 ( δ N–H), 886 ( ν Si–N–Si), and 782 cm −1 (Si–C), 21,22 respectively. NiPSZ shows similar absorption bands; however, it should be noted that compared with as-received PSZ , the absorption band intensity relative to ν Si–H (2120 cm −1 ) and δ C sp 2 –H (vinyl group, 3050 cm −1 ) decreases in NiPSZ , as shown in Table S1† and Fig.…”

First-principles study of CO2 hydrogenation to formic acid on single-atom catalysts supported on SiO2

“…[2][3][4][5][6][7][8] In this regard, the hydrogenation of CO 2 to formic acid/formate is one of the most promising conversions because it offers the storage of renewable energy via H 2 in the liquid state and produces a chemical with significant applications in various industries. [9][10][11][12][13] However, the industrial conversion of CO 2 requires high temperatures and pressures, which accelerates catalyst deactivation and causes high energy and economic consumption, hindering its large-scale production. Therefore, designing a catalyst that can achieve CO 2 catalytic conversion under mild conditions is considerably important.…”