Catalytic Performance and Characterization of Highly Efficient Composite Ni(Cl_x)/CeO₂/η‐Al₂O₃/FeCrAl Wire Mesh Catalysts for Preferential CO Methanation

Abstract

Structured composite Ni(Cl x )/CeO 2 /η-Al 2 O 3 /FeCrAl catalysts are developed for the reaction of preferential methanation of carbon monoxide in the presence of carbon dioxide. The use of a FeCrAl alloy wire mesh as a support for Ni(Cl)/CeO 2 allows preparation of a heat-conducting catalyst that is similar in performance and physical-chemical properties to the highly efficient catalysts in the form of micro pellets, as confirmed by catalytic tests and XRD, XPS, TEM, SEM, EDX characterization techniques. Catalytic tests are carried out in hydrogen-rich mixture which contains (vol. %): 1 CO, 65 H 2 , 10 H 2 O, 20 CO 2 , He -balance; weight hourly space velocity is 29,000 cm 3 g cat À 1 h À 1 . The structured catalyst with highly dispersed nickel and optimal chlorine content provides CO removal to a level of < 10 ppm in the temperature interval of 230-300°C. XRD, TEM, SEM and EDX analysis confirm the presence of Ni nanoparticles and CeOCl species in the catalytic coating. XPS study of samples after reductive pretreatment (simulating CO preferential methanation reaction conditions) in the preparation chamber of the spectrometer reveals the metallic state of Ni and high concentrations of Cl and Ce 3 + on the catalyst surface.[a] Dr.

Accelerating charge transfer for Ni(OH)2 through chlorine-anion decoration in the urea electrooxidation reaction

“…In the high-resolution spectrum of the Cl 2p peak (Fig. 1d) for Cl 32 –Ni(OH) 2 , chlorine anions mainly exist in the form of Ni–Cl bonds, 32 indicating that chlorine anions replace OH − in the hydroxide layers. It is because the concentration of Cl − in saturated NaCl solutions is 123 times higher than that of OH − (about 6.15 mol L −1 vs. 0.05 mol L −1 ), which can replace partial OH − and bond with Ni during the precipitation process.…”

“…Deionized water was used throughout all of the experiments. 16,24,32,40) and Ni(OH) 2 A facile one-step coprecipitation method was employed to synthesize Cl 32 -Ni(OH) 2 catalysts. In a typical preparation process, a certain weight of NaCl (32 g) was dissolved into 80 ml of deionized water in a 250-ml beaker and stirred for 1 h. Then, 2 g of Ni(NO 3 ) 2 Á6H 2 O was added to the solution under vigorous magnetic stirring and kept stirring for another 5 h. After that, 300 mL NH 3 ÁH 2 O was added to the mixed solution drop-wise.…”

Ni, Co Hydroxide Modified by Partial Substitution of OH– with Cl– for Boosting Ultra‐Fast Redox Kinetics up to 500 mV s−1 in Supercapacitors

“…The Cl content from the X‐ray photoelectron spectroscopy (XPS) is ≈6 at% (Figure 1f and Figure S5, Supporting Information). By deconvolution the XPS Cl 2p peak (Figure 1g), Cl atom mainly exists in the form of Ni/CoClCl bond, [ 29 ] indicating Cl – replaces OH – in the hydroxide layers (denoted as Ni/Co–OH). It is because the concentration of Cl – in saturated NaCl solutions is 123 times higher than that of OH – (about 6.15 mol L –1 vs 0.05 mol L –1 ), which can replace some of OH – and contact with Ni or Co during co‐precipitation.…”

Achieving high-capacity aqueous supercapacitors via anion-doped construction of dual redox centers in NixCo1−xSeO3

“…4c and d). 42,43 In 4e). It can be concluded that the binding of metal atoms in the hydroxide layer is more stable when N, Cl ions are located on both sides above and below the Ni atom.…”

“…In addition, Cl ion substitution also changes the electronic configuration of Ni and Co, which enhances the electrical conductivity and redox activity. 43 According to the above results, the reactive formula of the NCSeO-NCl-NiCC electrode can be speculated as follows: 40…”