Highly-efficient and magnetically-separable ZnO/Co@N-CNTs catalyst for hydrodeoxygenation of lignin and its derived species under mild conditions

Abstract

An efficient bimetallic ZnO/Co@N-CNT catalyst was designed for selective hydrogenation and hydrodeoxygenation of lignin and its derived components in water.

Facile sub-/supercritical water synthesis of nanoflake MoVTeNbOx-mixed metal oxides without post-heat treatment and their catalytic performance

“…In addition, another desorption peak g, also corresponding to strong acidic sites, emerges at 577 C in the curve of S400, which is enlarged greatly in S450. Unlike the former four samples, S450 possesses peak d (326 C) related to medium acidic sites 52,53 instead of peak a. According to the results of XRD and XPS, it could be seen that the amount of the Mo 4 O 11 phase, Mo 6+ and Nb 5+ increased evidently with the increase of synthesis system temperature.…”

“…According to the literature, the desorption peaks centered at 250 C and 624 C in the prole of sample S250, marked as a and b, can be attributed to weak and strong acidic sites, respectively. 52,53 With the increase of synthesis temperature from 250 to 400 C, the area of peak a is continuously enlarged, meanwhile, an obvious shi of peak b to higher temperatures (from 624 C for S250 to 710 C for S450) is observed. In addition, another desorption peak g, also corresponding to strong acidic sites, emerges at 577 C in the curve of S400, which is enlarged greatly in S450.…”

Structural refinement and electrochemical properties of one dimensional (ZnO NRs)1−x(CNs)x functional hybrids for serotonin sensing studies

“…Figure 10 depicts the N 2 adsorption-desorption isotherms of the bare ZnO NRs and representative ZCNT 0.1 and ZRGO 0.04 NCs. From the N 2 adsorption-desorption isotherms, all the samples exhibits the type IV isotherms due to the formation of multilayers and type H3 hysteresis loop [70][71][72] . The specific surface area of the desired bare ZnO NRs, and representative ZCNT 0.1 NCs and ZRGO 0.04 NCs was calculated by using BET method and the observed values are 16.699, 97.895 and 55.078 m 2 /g, respectively (Table S6, SI).…”

Modified Metal–Organic Frameworks as Efficient Catalysts for Lignocellulosic Biomass Conversion

“…In addition, carbonized MOFs contain active metal NPs derived from metal ions in the framework, which are more suitable for heterogeneous catalysis. One area where carbonized MOFs are widely used as catalysts is the HDO of lignin 12,41,82–84 . When pristine MOFs are used, the catalytic reactions must be carried out under mild conditions, i.e ., low temperature and pressure, because of the low thermal and chemical stabilities of the MOFs.…”

“…In multistep reactions, the combined substances act as multifunctional catalysts. Finally, MOFs can be thermally treated in an inert gas or H 2 environment to create catalysts in which metal NPs are well dispersed in porous carbon 9,41–47 . Because organic linkers are transformed into a carbon framework during the thermal treatment, they have improved thermal and chemical stabilities than that of pristine MOF.…”