Combining Mo–Cu/HZSM-5 with a two-stage catalytic pyrolysis system for pine sawdust thermal conversion

Abstract

a b s t r a c tMo-Cu/HZSM-5 catalysts for pine sawdust thermal conversion were prepared using an impregnation method. The Mo-Cu/HZSM-5 catalysts and HZSM-5 were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD) and transmission electron microscopy (TEM). All characterization results indicated that the introduction of CuO is beneficial to the dispersion of MoO 3 in the HZSM-5. Combined with the two-stage catalytic pyrolysis system, the Mo-Cu/HZSM-5 catalysts were used for pine sawdust thermal conversion. The products included gas, bio-oil and bio-char. The gas was analyzed by Gas chromatography (GC). Gas chromatography-mass spectrometry (GC-MS) was used to identify the compounds in bio-oils. The water content, higher heating value (HHV) and viscosity of bio-oils were measured. The HHV and elements of bio-char were determined. The results indicated that Mo(3%)-Cu(3%)/ HZSM-5 treatment yielded the highest amount of C 6 -C 12 hydrocarbons, showed a robust ability to convert methane in the gas to bio-oil, and displayed no significant difference in the properties of bio-char when compared to different treatments in the same pyrolysis conditions.

Application, Deactivation, and Regeneration of Heterogeneous Catalysts in Bio-Oil Upgrading

“…In the ex-situ process, bio-oil catalytic upgrading is completed in a secondary reactor separate from the biomass pyrolysis reactor. This process enables easier catalyst performance optimization and reduces catalyst to biomass ratio [29,30]. Catalysts include zeolite and oxides.…”

Aromatic Hydrocarbon Production from Eucalyptus urophylla Pyrolysis over Several Metal‐Modified ZSM‐5 Catalysts

“…This is because metals can adjust the acidity of ZSM‐5 and promote desirable reactions during pyrolysis, which can potentially increase the yield of the beneficial compounds and reduce coke formation on the catalyst . Among the metals proposed for this purpose are Zn, Mo, Ga, Ni, Co, Cu, Mn, and Fe . Some metal‐modified ZSM‐5 catalysts are currently used commercially for the conversion of light hydrocarbons to aromatics.…”

“…[24] Amongt he metals proposed for this purpose are Zn, Mo, Ga, Ni, Co,C u, Mn, and Fe. [17,[24][25][26][27][28][29] Somem etal-modified ZSM-5catalysts are currently used commercially for the conversion of light hydrocarbons to aromatics. Fore xample,G amodified ZSM-5 has been used for the aromatization of low alkanesi nt he Cyclar process by UOP and BP, [30][31][32] and Zn/ HZSM-5 is used for the production of aromatics from olefinrich hydrocarbons in the Alpha Process by Asahi Kasei Chemicals Corp. [33] Ni is used as ac atalyst for the steam re-forming of methane, [34,35] and Ni-Ga catalysts are active in the productiono fm ethanol.…”

Modification and regeneration of HZSM-5 catalyst in microwave assisted catalytic fast pyrolysis of mushroom waste

“…For the modification of HZSM-5, Huang et al [15] modified HZSM-5 zeolites by CuO and MoO 3 for the thermal conversion of pine sawdust, and they indicated that Mo(3%)-Cu(3%)/HZSM-5 treatment promoted the highest yield of C 6 $ C 12 hydrocarbons. Sheng et al [16] analyzed the effect of stream treatment on HZSM-5 during ethanol dehydration to ethylene, and they detected that the total amount of acid sites of HZSM-5, especially the strong acid sites, decreased after stream treatment, which led to the improvement of catalytic stability.…”