Enhanced CO₂capture capacities and efficiencies with N-doped nanoporous carbons synthesized from solvent-modulated, pyridinedicarboxylate-containing Zn-MOFs

Supercritical Carbon Dioxide Extraction-Mediated Amendment of a Manganese Oxide Surface Desired to Selectively Transform Nitrogen Oxides and/or Ammonia

“…Meanwhile, the supercritical CO 2 extraction (SC-CO 2 ) technique serves to synthesize a high-performance NO X reduction catalyst. The SC-CO 2 medium was reported to be highly diffusive in and miscible with various synthetic solvents along with low viscosity and a lack of surface tension. , Hence, the extraction of a synthetic solvent from a nanocomposite of a Mn oxide precursor and TiO 2 using an SC-CO 2 medium may minimize the repercussions incurred by surface tension and the capillary motion of solvent molecules confined in micropores of the composite, all of which are infamous in severely collapsing microporous architectures or aggregating metal oxide nanoparticles. − Hence, our hypothesis in this study is that a large quantity of surface Mn sites active for NO X reduction can be highly dispersed on bimodal TiO 2 using SC-CO 2 ( v ). We also postulate that the strengths of surface sites can be tuned by the SC-CO 2 medium in a desired fashion ( iii and iv ) and thus may enable us to selectively reduce NO X or oxidize NH 3 for the preferential production of N 2 over NO 2 and N 2 O ( i – iv ).…”

Catalytic activity and stability of carbon supported V oxides and carbides synthesized via pyrolysis of MIL-47 (V)

“…Pyrolysis of activated MIL-47 (V) was performed according to the procedure we previously employed [25,38,56]. The activated MIL-47 (V) was loaded into a tube furnace (Thermo Scientific Lindberg ® Blue M) and subjected to pyrolysis under an Ar flow of 30 mL min -1 with a ramp rate of 10 °C min -1 to the target temperatures ranging from 600 °C to 1100 °C held for 6 hours.…”

“…However, the loss of active V species during the reactions was unavoidable due possibly to insufficient chemical stability between silicate and V species under the reaction conditions employed (Table S1) [20,[35][36][37]. Carbon is a promising support material because it can provide several advantages such as high surface area [38][39][40], high dispersion of active V species [25,41], high resistance to thermochemical oxidation [42][43][44], and compatibility with a wide range of active V phases [25,45]. In particular, the interaction between active V species and carbon can be promoted via pyrolysis under an inert atmosphere, wherein V precursors are carbothermally reduced by carbon to generate reduced V nanoparticles embedded in holes on the carbon surface [25,38,46].…”

A metal–organic framework modulated to site-isolate Cl˙ pendants via radical inter-conversion for degrading hard-to-ionize aqueous organic wastes

“…14,52,53 The 1 H-NMR spectra of the MOFs subjected to HF digestion were utilized to quantify the amounts of DMF (Y; synthetic solvent) and dodecanoates (N MODULATOR ; deprotonated modulator) relative to BDC or BDC-Cl (6-X; set to 1) using eqn (S3)-(S6) †. 14,62,63 The quantities of deprotonated modulators present in the MOFs were validated to be sparse, as evidenced by their N MODULATOR values of #0.02 (Fig. S5 and Table S2 †).…”

“…52,53 The base units of the MOFs were nally assessed using the results of 1 H-NMR spectroscopy (X and Y) and titration experiments (X), as speci-ed in Table S4. † 14,52,53,62,63 Despite the MOFs having similar DMF compositions (Y), modulated UiO-66-Cl displayed a greater composition of missing organic struts than its unfunctionalized counterpart (X of ∼1.1 for UiO-66; ∼1.4 for UiO-66-Cl). This might result from the Cl SUP /Cl − SUP pendants of modulated UiO-66-Cl incurring additional surface tension or capillary forces during desolvation, despite the use of supercritical CO 2 extraction.…”