In-Situ Liquid Hydrogenation of m-Chloronitrobenzene over Fe-Modified Pt/Carbon Nanotubes Catalysts

Abstract

Abstract:In-situ liquid-phase hydrogenation of m-chloronitrobenzene (m-CNB) based on aqueous-phase reforming (APR) of ethanol and catalytic hydrogenation was carried out over Fe-modified Pt/carbon nanotubes (CNTs) catalysts. The effects of Pt loading over CNTs and Fe modification on the catalytic performance of Pt/CNTs catalysts were studied. In-tube loading of Pt particles, compared with out-tube loading, considerably improved the catalytic activity. With in-tube loading, Fe-modified Pt/CNTs catalysts further improved the m-CNB in-situ hydrogenation performance. After Fe modification, Pt-Fe/CNTs catalysts formed, inside CNTs, a Pt-Fe alloy and iron oxides, which both improved catalytic hydrogenation performance and significantly enhanced ethanol APR hydrogen producing performance, thereby increasing the m-CNB in-situ hydrogenation reactivity.

Hydrogenation of m-Chloronitrobenzene over Different Morphologies Ni/TiO2 without Addition of Molecular Hydrogen

“…Meanwhile, electron-rich Ti 3+ species can transfer electrons to Ni species [45]. On basis of the peak areas for reduced Ni 0 and oxidized Ni 2+ , Ni/TNT contains more reduced Ni 0 than the other catalysts (Table 1), which might be due to the easier reduced nickel species in the preparation of Ni/TNT and the unique confinement effect of nanotubes [6,46].…”

“…Firstly, Ni/TNT has a larger specific surface area and pore volume, smaller and narrowerdistributed pore sizes than Ni/TNP, Ni/TNS and Ni/TMS. Noticeably, the nanotubular structure of Ni/TNT has a unique nanoscale confinement effect, which endows the catalysts with higher catalytic activity [6,46,47]. Secondly, the in-situ liquid-phase hydrogenation of m-CNB consists of ethanol APR for hydrogen generation ( Figure S2 and Table S1) and m-CNB catalytic hydrogenation.…”

“…As shown in Table 4, Ni/TNT showed no obvious loss of catalytic activity in the fourth cycle. The confinement effect of nanotube can enhance the stability of Ni/TNT by preventing the loss and aggregation of Ni nanoparticles [6].…”

“…Armatic haloamines are important intermediates in the synthesis of various organic compounds, such as dyes, drugs, and pesticides [1]. The reduction reaction of chloronitrobenzene (CNB) for the preparation of chloroaniline (CAN) (Scheme S1) can be divided into iron powder reduction [2], alcali sulphide [3] or hydrazine hydrate reduction [4], electrochemical reduction [5] and catalytic hydrogenation [6][7][8][9][10]. In particular, catalytic hydrogenation featured by environmental friendly, atom economy, high product purity and high yield is the most promising clean technique in the industry.…”

Catalytic Ozonation by Iron Coated Pumice for the Degradation of Natural Organic Matters

“…In Equation (10), ksolution and kinterface are pseudo first-degree rate constants in solution and interface. When the phosphate solution is added, the effect on the interface and solution is given in Equations (11) and (12). The inhibitory effect of phosphates on catalytic ozone has been observed.…”