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TiOx/Pd interfacial catalysts with controllable geometrical/electronic effects for industrial H2O2 production |
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| Authors: | Fengyu Zhang Chenglin Miao Qian Wang Mingyu Gao Dianqing Li Junting Feng |
| Affiliation: | 1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China
Contribution: Data curation (lead), Investigation (lead), Writing - original draft (lead), Writing - review & editing (lead);2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China Contribution: Data curation (supporting), Formal analysis (lead), Writing - original draft (supporting);3. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China Contribution: Methodology (supporting), Supervision (equal), Writing - review & editing (equal);4. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China Contribution: Data curation (supporting), Supervision (supporting), Writing - review & editing (supporting);5. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, China Contribution: Funding acquisition (supporting), Software (supporting), Supervision (supporting);6. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China |
| Abstract: | Aiming at controllable modulating metal−support interactions to achieve an optimal trade-off of geometric/electronic effect in supported catalysts, we developed a reliable approach based on the typical 2D material layered double hydroxide (LDHs). A series of TiOx/Pd/MgTiAl-MMO-X catalysts with adjustable interfacial effect were acquired by loading PdCl42− precursor and further preciously adjusting the topological reduction temperature, based on the regulatory effect of Mg–O–Ti–O–Al–O structure in the support on the reducibility and mobility of Ti4+. The catalysts with semi-continuous and accessible TiOx/Pd interface, confirmed by AC-HAADF-STEM, CO chemisorption, XPS, exhibit much higher H2O2 yield than the catalyst with over-encapsulation structure. The TiOx/Pd/MgTiAl-MMO-450 catalysts possessed optimal geometric and electronic structure exhibited the highest activity with TOF of 9.75 s−1, excellent H2O2 yield of 11.4 g/L, as well as good stability. |
| Keywords: | coverage degree hydrogen peroxide interface structure layered double hydroxide tunable metal–support interaction |