Enhanced Catalytic Performance of Fe‐containing HZSM‐5 for Ethane Non‐Oxidative Dehydrogenation via Hydrothermal Post‐Treatment

Abstract

A facile strategy is applied to construct Fe supported ZSM-5 (Fe/HZ5-HTS) via hydrothermal post-treatment and applied to ethane non-oxidative dehydrogenation. Compared with Fe/ HZ5-IWI prepared by incipient wetness impregnation, Fe/HZ5-HTS exhibits superior catalytic activity and long catalyst stability with 6000 minutes time-on-stream. An obvious volcanic curve is observed between the ethylene generation rate and Fe content, and 1.0Fe/HZ5-HTS exhibits the highest ethylene generation rate with 0.166 mmol C 2 H 4 s À 1 g Fe À 1 over different Fe loading, which is twice as much as that of 1.0Fe/HZ5-IWI. According to various characterizations, isolated Fe 3 + species and carburized Fe species are active sites, and the better catalytic performance over 1.0Fe/HZ5-HTS is ascribed to more disperse Fe species and exposing more Fe species in the surface. Besides, the lower ethylene desorption temperature and higher ethane desorption temperature over Fe/HZ5-HTS could suppress the overreaction of the ethylene to generate coke and increase ethane residence reaction time, resulting in less coke deposition and facilitating the catalytic performance.

Fe-Substituted Pt/HZSM-48 for Superior Selectivity of i-C12 in n-Dodecane Hydroisomerization

“…29 For the fully Fe-substituted HZ48-0, a weak absorption peak centered at ∼350 nm (shaded in pale green) is also observed, indicating the existence of a trace amount of oligomeric Fe x O y clusters. 30,31 This may explain the additional minor XRD diffraction peak observed for this sample.…”

Elucidating the Active-Phase Evolution of Fe-Based Catalysts during Isobutane Dehydrogenation with and without CO2 in Feed Gas

“…The formation of Fe 3 C phase and α-Fe phase was also demonstrated by the Fe 2p XPS spectrum at about 706.3 eV (Figure 4b). 24,45 In situ XRD was employed to track the phase evolution of iron species during different reactions. As shown in Figure 5a, characteristic diffraction peaks of Fe 3 O 4 phase appears after 10 min of reaction without the introduction of CO 2 .…”

“…In contrast, Fe 3 C phase (2θ = 42.9° and 43.7°) and α-Fe phase (2θ = 44.7°) appear after dehydrogenation reactions with lower CO 2 /i-C 4 H 10 feed ratios (0/1, 1/5 or 1/3). The formation of Fe 3 C phase and α-Fe phase was also demonstrated by the Fe 2p XPS spectrum at about 706.3 eV (Figure b). , …”

Atomically Dispersed Co2+ Sites Incorporated into a Silicalite-1 Zeolite Framework as a High-Performance and Coking-Resistant Catalyst for Propane Nonoxidative Dehydrogenation to Propylene

“…Zeolites have been studied as excellent supports to stabilize transition-metal active sites for their unique pore structure, high adsorption capacity, and strong acid sites. , Hence, it is worthwhile considering whether Co active sites could be stabilized by combining with Si–O units of the zeolite framework to form Si–O–Co units.…”