Heteroatom doping effect of Pt/rGO catalysts for formaldehyde abatement at ambient temperature
Heteroatom doping effect of Pt/rGO catalysts for formaldehyde abatement at ambient temperature
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DOI：
10.1016/j.chphi.2022.100103
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发表时间：
2022-08
影响因子：
2.2
通讯作者：
Zhao Di;Han-ting Shen;Yaodong Guo;Xiaonan Guo;Bin Kang;Mengfei Guo;Yingxi Wei;Jingbo Jia
中科院分区：
文献类型：
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作者：
Zhao Di;Han-ting Shen;Yaodong Guo;Xiaonan Guo;Bin Kang;Mengfei Guo;Yingxi Wei;Jingbo Jia
研究了掺杂不同杂原子（N、P、S和F原子）对还原氧化石墨烯（rGO）催化剂理化性质及其对甲醛（HCHO）氧化性能的影响。在环境温度下，负载为1wt % Pt （Pt/N-rGO）的氮掺杂rGO样品在50,000 mL/（g× h）的气体小时空速（GHSV）下表现出82%的优异HCHO转化率。此外，连续测试48 h后，Pt/N-rGO催化剂在室温下仍保持了出色的活性和稳定性。一系列表征结果表明，与掺杂其他杂原子的rGO相比，氮掺杂显著增加了rGO的缺陷程度和比表面积，促进了Pt纳米颗粒（NPs）的分散，产生了更多的零价Pt （Pt0）。此外，掺杂杂原子的样品中，Pt NPs的平均粒径从36.4 nm减小到4.4 nm。结合HCHO-DRIFTS的结果表明，Pt/N-rGO样品表面高度分散的Pt NPs有利于氧的活化和甲酸中间产物的进一步转移。
The effect of doping with different heteroatoms (N, P, S, and F atoms) on physicochemical properties of reduced graphene oxide (rGO) catalysts and their performances on formaldehyde (HCHO) oxidation is investigated in this study. Nitrogen-doped rGO with a loading of 1 wt% Pt (Pt/N-rGO) sample exhibits a superior HCHO conversion of 82% at a gas hourly space velocity (GHSV) of 50,000 mL/(g× h)at ambient temperature. In addition, the Pt/N-rGO catalyst remained an outstanding activity and stability at room temperature after testing continuously for 48 h. A series of characterization results showed that nitrogen-doping significantly increased the defect degree and specific surface area of rGO compared with rGOs doped with other heteroatoms, promoted the dispersion of Pt nanoparticles (NPs), and produced more zero-valent Pt (Pt0). In addition, the average particle size of the Pt NPs in the samples doping with heteroatoms decreased from 36.4 nm to 4.4 nm. Combined with the results of HCHO-DRIFTS, the highly dispersed Pt NPs on the surface of Pt/N-rGO sample was conducive to activate oxygens and further transfer the formate intermediate.