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Non-thermal plasma activation promotes CO2 conversion over Ni catalysts supported on BETA zeolite via multiple reaction mechanisms.

A systematic study of Ni supported on metal-organic frameworks (MOFs) catalyst (i.e., 15Ni/UiO-66) for catalytic CO 2 hydrogenation under nonthermal plasma (NTP) conditions was presented. The catalyst outperformed other catalysts based on conventional supports such as ZrO 2 , representing highest CO 2 conversion and CH 4 selectivity at about 85 and 99%, respectively. We found that the turnover frequency of the NTP catalysis system (1.8 ± 0.02 s −1) has a nearly twofold improvement compared with the thermal catalysis (1.0 ± 0.06 s −1). After 20 hr test, XPS and HRTEM characterizations confirmed the stability of the 15Ni/UiO-66 catalyst in the NTPactivated catalysis. The activation barrier for the NTP-activated catalysis was calculated as~32 kJ mol −1 , being lower than the activation energy of the thermal catalysis (~70 kJ mol −1). In situ DRIFTS characterization confirmed the formation of multiple carbonates and formates on catalyst surface activated by NTP, surpassing the control catalysts (e.g., 15Ni/α-Al 2 O 3 and 15Ni/ZrO 2).

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Bimetallic Pt-Ni catalysts can promote catalytic dry reforming of methane (DRM) with the improved activity and deactivtaion resistance compared to the relevant monometallic catalysts. Further development of the Pt-Ni catalyst...

It is challenging to avoid the formation of defects in zeolite membranes during their preparation.Herein, we present a facile vacuum-assisted deposition (VAD) method as a feasible solution to address this challenge. Defective SAPO-34 membranes supported on tubular porous alumina were healed using bis(triethoxysilyl)ethane (BTESE)-derived organosilica via VAD and these showed an improved performance in the selective CO 2 separation from an equimolar CO 2 /CH 4 mixture. Specifically, by controlling the amount of organosilica deposited, the coating was able to heal the non-selective defects in SAPO-34 membranes without compromising the CO 2 permeance, but increased the CO 2 /CH 4 selectivity notably (by a factor of ca. 2.5 at 25 °C and 200 kPa). An excessive coating of organosilica by VAD resulted in a thick layer on top of the SAPO-34 membrane which led to a significant decrease in the CO 2 permeance. Additionally, a modified membrane was also investigated for the CO 2 /CH 4 gas feed with different CO 2 concentrations from 20-50 mol.% and this showed that a relatively concentrated CO 2 in the system could also be improved in terms of its separation performance.

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