Mechanism of deoxygenation in anisole decomposition over single-metal loaded HZSM-5: Experimental study

Abstract

This work investigates the deoxygenation reaction during the decomposition of anisole (methoxy-rich model compound of lignin) over bi-functional catalyst. The bifunctional catalyst consisted of a single metal loaded on an acid support; the active metals, i.e. Ni, Co, Mo and Cu, were loaded at various rates, and the acid support was HZSM-5 zeolite with a Si/Al ratio of 25 (HZ(25)). Experiments were conducted in a bench-scale fluidised bed reactor within the temperature range from 400˚C to 600˚C. Experimental results revealed that the increase in temperature and metal loading promoted the selectivity of BTX fraction. Nevertheless, a simultaneous increase in the yield of carbonaceous deposits was also observed at the expense of liquid fraction, both phenolics compounds (Phs) and aromatic hydrocarbons (AHs). 500˚C was the preferred temperature for BTX production. Ni-loaded HZ(25) catalyst

Deoxygenation in anisole decomposition over bimetallic catalysts supported on HZSM-5

“…Our research group has recently reported the conversion of anisole over non-metal HZSM-5 zeolite [10]. Compared to the results previously reported, both the yield and selectivity of BTX have been enhanced by the addition of the bimetallic sites (on average by 20% and 36% respectively) [10,32]. The improvement is attributed to an increment in the conversion of Phs towards BTX, and indicates that the studied supported bimetallic catalysts may promote the deoxygenation of Phs.…”

“…This work aims to investigate the deoxygenation reaction in the decomposition of anisole over zeolite supported bimetallic catalysts for the production of the BTX fraction (benzene, toluene, and xylene). Our previous study has reported the excellent performance of 1%Ni/HZ (25) and 1%Mo/HZ (25) in the decomposition of anisole [32], besides, our modelling work also revealed that Ni and Mo led to high adsorption energy in anisole adsorption, and Fe resulted in a low energy adsorption [33]. In this study, combinations of Ni, Mo and Fe active metal sites were evaluated.…”

“…Experiments were carried out in the bench scale fluidised bed reactor (Diameter*Height mm = 32mm×600mm); further details of the rig can be found in literature [10,32].…”

“…In this study, combinations of Ni, Mo and Fe active metal sites were evaluated. Based on previous experimental work, severe carbonaceous deposit was observed over Ni and Mo based catalysts [32]. Fe is used in this study to tune the strong adsorption of catalysts and alleviate the severe deposit, so the loading ratio of Fe is kept the same as Ni and Mo.…”

Development of Bifunctional Hydrodeoxygenation Catalyst Rh‐HY for the Generation of Biomass‐Derived High‐Energy‐Density Fuels

“…Phenol is well known to have a difficult‐to‐cleave C aromatic —OH bond and acts as an HDO inhibitor by strongly adsorbing to the catalyst acid sites . Conversely, anisole's methoxy group can provide insights about the preference of first‐step hydrogenation versus C aromatic —O—CH 3 cleavage via the demethoxylation–demethylation route . Figure shows the conversion and selectivity as a function of TOS for 0.8Rh‐HY‐R.…”