Concentrated Platinum‐Gallium Nanoalloy for Hydrogen Production from the Catalytic Steam Reforming of Ethanol

Abstract

The steam reforming of ethanol (SRE) is a key process for the production of H 2 and other vital hydrocarbons. The present work describes the synthesis of Platinum-Gallium (PtÀ Ga) nanoalloys supported on mesostructured cellular foam (MCF-17) via ultrasound-assisted impregnation method. Ga was substituted with Pt in different wt.% i. e. Pt/MCF-17, Pt 99.9 Ga 0.1 /MCF-17, Pt 99 Ga 1 /MCF-17, and Pt 90 Ga 10 /MCF-17 and was evaluated towards the SRE at a temperature range of 473K-773 K towards hydrogen (H 2 ), acetaldehyde (CH 3 CHO), diethylether (DEE), ethylene (C 2 H 4 ), carbon monoxide (CO), carbon dioxide (CO 2 ), methane (CH 4 ), and ethane (C 2 H 6 ). The SRE activity and H 2 formation rate with Pt 90 Ga 10 /MCF-17 catalyst were observed to be 68.1 % and 3047.2 nmole g À 1 sec À 1 , which is 9.8 and 4.5 times more than the Pt/MCF-17 counterparts. Moreover, as observed from DRIFTS, NH 3 -TPD and XPS studies Ga showed high interaction with Pt in the electron deficit state which resulted in the increased dehydrogenating and acidic properties that resulted in a higher yield of H 2 .

Pt/MnO Interface Induced Defects for High Reverse Water Gas Shift Activity

“…In this process, an electron transfer from partially reduced support to metal nanoparticles is initiated, which can be reflected in red‐shift of the adsorbed CO wavenumber [44] . In our case, NAP‐XPS results indicate no electron transfer since the observed Pt 4 f binding energy coincides with the value expected for bulk platinum [45] . Moreover, the information about electronic interactions between Pt and Mn 2+ was obtained through Ultraviolet Photoelectron Spectroscopy (UPS) measurements which were carried out over MnO and Pt/MnO samples.…”

Hydrogen production from ethanol by steam reforming with recyclable NiCaOx/NaCl catalysts

“…46 The wavenumber at 1066 cm −1 was attributed to the monodentate and bidentate vibrations of ν (CO) of the ethoxy group. 47 The wavenumbers at 1479 cm −1 and 1371 cm −1 were attributed to the δ as (CH 3 ) and δ s (CH 3 ) vibration modes of the ethoxy group, respectively. The related vibration peaks were also observed at 2973 cm −1 , 2900 cm −1 , 2731 cm −1 and 2304 cm −1 .…”

“…The related vibration peaks were also observed at 2973 cm −1 , 2900 cm −1 , 2731 cm −1 and 2304 cm −1 . 47,48 The intensity of the characteristic peaks related to ethanol adsorption increased continuously within 30 min of the reaction, indicating that the NiCaO x /NaCl catalyst had a great adsorption capacity for ethanol molecules. The vibration peak at 2732 cm −1 corresponded to ν (CO) in acetaldehyde.…”

Modulating Mxene‐Derived Ni‐Mom‐Mo2‐mTiC2Tx Structure for Intensified Low‐Temperature Ethanol Reforming

“…Notably, ethane was detected under 5Ni/MTC‐72h, which could be attributed to its weaker catalytic activity on the C─C bond cracking compared with 10Ni/MTC‐72h, thus forming ethane from ethanol/intermediate dehydrogenation and ethylene hydrogenation via Ni‐Mo catalysis (Figures S1 and S2, Supporting Information). [ 37 ] Moreover, the concentration of CH 4 increased with the Ni loadings, which could be attributed to the promotion of methanation under a high Ni addition. The maximum HUE was achieved under the catalysis of 10Ni/MTC, indicating comprehensively optimal ethanol conversion and H 2 selectivity.…”