This study investigates the stability and activity of HZSM-5 doped with metals such as molybdenum, nickel, copper, and iron under hydrothermal conditions used for the direct liquefaction of microalgae. Catalysts have been prepared by ion-exchange techniques, and MoZSM-5 was also prepared by wet incipient impregnation for comparison. Hydrothermal liquefaction is considered a potential route to c...

The formation of carbonaceous deposits (coke) in zeolite pores during catalysis leads to temporary deactivation of catalyst, necessitating regeneration steps, affecting throughput, and resulting in partial permanent loss of catalytic efficiency. Yet, even to date, the coke molecule distribution is quite challenging to study with high spatial resolution from surface to bulk of the catalyst parti...

Hydrolysis of ethyl acetate and starch in water and of cellulose in an ionic liquid by using HY and HZSM-5 solid acid catalysts are compared. In water, HZSM-5 is more active than HY. This trend is reversed in ionic liquid. Reactivity differences are explained based on interactions between solvent and catalyst acid site local environments, which depend on zeolite channel structure and Si/Al rati...

Fischer-Tropsch Synthesis (FTS) using Fe-Co/meso-HZSM-5 catalyst has been investigated. The impregnated iron and cobalt on HZSM-5 could be used as bifunction which combined polimerizing synthesis gas long hydrocarbon cracking for making biofuel (saturated C5–C25 hydrocarbons gasoline, kerosene diesel oil). study emphasized the effect of weight product composition process conversion. HZSM-5, had...

photodegradation of dicamba, an ionizable herbicide, using tio2 supported on hzsm-11 zeolite was investigated. four photocatalysts with different weight percentages (wt%) of tio2 were evaluated: 3%, 10%, 30% and 50%. the effects of the catalyst concentration, the initial ph value and the repeatability of the photocatalytic activity after multiple cycles of reuse were also evaluated. results sho...

The catalytic degradation of chlorinated volatile organic compounds (CVOCs) at low temperatures is a great challenge. In this work, Pt-Co/HZSM-5 ternary catalysts were synthesized and used for the oxidation dichloromethane (DCM). By adding only trace amounts Pt (0.01 wt. %), catalyst exhibits better CO2 yield lower by-product than Co/HZSM-5 catalyst. Besides, it maintained stable activity least...

The promotional effect of Zn was investigated relative to the calcining activation HZSM-5. It found that lignin separated from walnut shell could be liquefied into small molecular ethers such as anisole by modified catalyst. Experimental results showed that, after loading Zn, HZSM-5 catalyst retained its original crystal structure, which exhibited good metal dispersion. Besides, due existence ...

This study investigated on the co-pyrolysis of microalgae Chlorella vulgaris and high-density polyethylene (HDPE) waste mixtures which was performed with three types catalysts, namely limestone (LS), HZSM-5 zeolite, novel bi-functional LS/HZSM-5/LS. Kissinger-Kai (K-K) model-free method coupled Particle Swarm Optimization (PSO) model-fitting using thermogravimetric experimental data. A global s...