Multi-channel ceramic catalytic membrane for highly efficient and continuous hydrogenation of p-nitrophenol

Insights into the Catalytic Performance of Multichannel Ceramic Catalytic Membrane in Liquid-Phase p-Nitrophenol Hydrogenation: Role of Storage Method

“…In all cases, p -aminophenol was detected as the only product (data not shown here), in line with our precious works. , As shown in Figure a, the storage method obviously influences the catalytic activity of the Co@CM sample. Interestingly, as Co@CM was stored in ethanol and then directly used for the catalytic test, the obtained Co@CM-E-W shows the most excellent catalytic activity and exceeds the fresh Co@CM sample, which almost achieves complete p -nitrophenol conversion in 20 min (Figure a).…”

“…The adsorption of p -nitrophenol in the catalytic membranes was evaluated via the same operation as the catalytic tests except that no NaBH 4 was added. The results indicate that there is no obvious p -nitrophenol adsorption in the catalytic membranes (Table S1), and the storage method almost has no influence on the adsorption of p -nitrophenol, which may be ascribed to the flow-through operation mode (Scheme S1), in line with our previous work . In addition, the water fluxes of the catalytic membranes were evaluated (Figure S3).…”

“…As a result, a new peak near ∼500 eV corresponding to the sodium salt appears in the XPS survey spectra of the recovered catalytic membranes (Figure S6A). The Co 0 and Co 2+ /CoN x species are detected in all the catalytic membranes (Figure S6B), and the Co 0 species, i.e., the Co nanoparticles, are the catalytic center for the p -nitrophenol hydrogenation. , The lower surface Co 0 content should be ascribed to the coverage of the Co nanoparticles by a carbon layer resulted from the pyrolysis of ZIF-67 in Ar atmosphere . The N 1s spectrum of each catalytic membrane consists of pyridinic-N (398.7 eV) and pyrrolic-N (400.1 eV) (Figure S6C).…”

“…Sheet, tubular, hollow fiber, and nanofiber membrane configurations have been often applied for the fabrication of catalytic membranes . Very recently, in our group, multichannel ceramic membranes were used to prepare catalytic membranes owing to their robust mechanical strength, higher surface area, and easy construction of membrane modules. , The as-prepared Co@CM-550-0.06-1 catalytic membrane exhibited a superior catalytic performance in the p -nitrophenol reduction at lower NaBH 4 / p -nitrophenol molar ratio and higher p -nitrophenol concentration …”