Catalytic pyrolysis over transition metal-modified zeolites: A comparative study between catalyst activity and deactivation

Persson, Henry; Duman, Isa; Wang, Shule; Pettersson, Lars J.; Yang, Weihong

doi:10.1016/j.jaap.2018.12.005

Cited by 87 publications

(23 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…reported a maximum aromatic yield of 43.5% in the co‐catalytic conversion of MF and methanol over HZSM‐5. Persson et al . studied the catalytic pyrolysis of sawdust over transition metal‐modified zeolites (HZSM‐5, Fe/ZSM‐5, Ni/ZSM‐5 and FeNi/ZSM‐5) and found that the metal doping increased aromatics, especially monoaromatic hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al 39 reported a maximum aromatic yield of 43.5% in the co-catalytic conversion of MF and methanol over HZSM-5. Persson et al 40 studied the catalytic pyrolysis of sawdust over transition metal-modified zeolites (HZSM-5, Fe/ZSM-5, Ni/ZSM-5 and FeNi/ZSM-5) and found that the metal doping increased aromatics, especially monoaromatic hydrocarbons. Generally, CFP of biomass is a simple and promising technology for the production of PX, but a wide variety of products are produced in CFP.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selective conversion of furans to p‐xylene with surface‐modified zeolites

Zhu

Fan

Wang

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND Owing to the growing consumption of oil and the negative environmental impacts, the production of p‐xylene (PX) from renewable biomass has gained significant attention recently. However, the major challenge for the production of PX from biomass or furans is how to improve the yield and selectivity of PX, along with reducing coke. RESULTS The para selectivity in the catalytic conversion of furans was greatly enhanced owing to the deactivation of external surface and the adjustment of pore entrance. Co‐catalytic conversion of furans and methanol significantly enhanced the production of PX by the Diels–Alder reactions between furans and olefins and the alkylation of benzene/toluene with methanol. The highest PX yield of 17.8 C‐mol% with a p‐xylene/xylene ratio of 94.5% was obtained by the co‐conversion of 2‐methylfuran with methanol over the 15%La/10%Ce/HZ catalyst. CONCLUSION This work proved that furans (2‐methylfuran, 2,5‐dimethylfuran, furfural and furan) were able to be selectively converted into a high‐value chemical (PX) over the 15%La/10%Ce/HZ catalyst. The transformation mainly involved four key reactions: the catalytic cracking of furans, the Diels–Alder reactions, the alkylation of aromatics and the isomerization of xylenes over the surface‐modified zeolite. © 2019 Society of Chemical Industry

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selective conversion of furans to p‐xylene with surface‐modified zeolites

Zhu

Fan

Wang

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…Ni-Fe produced an additive effect. Individually, Fe increased yields of monoaromatics, while Ni increased yields of naphthalenes [82]. When combined, this catalyst generated more monoaromatics and naphthalenes.…”

Section: Metal Doped Hzsm-5mentioning

confidence: 93%

Catalytic Fast Pyrolysis of Lignocellulosic Biomass to Benzene, Toluene, and Xylenes

Gong¹

2022

Recent Perspectives in Pyrolysis Research

View full text Add to dashboard Cite

Catalytic Fast Pyrolysis is a rapid method to depolymerize lignocellulose to its constituent components of hemicellulose, cellulose, and lignin. The pyrolysis reaction in absence of oxygen occurs at a very high heating rate to a targeted temperature of 400 to 600 °C for very short residence time. Vapors which are not condensed and are then contacted with a catalyst that is efficient to deoxygenate and aromatize the pyrolyzed biomass. One class of highly valuable material that is produced is a mixture of benzene, toluene, and xylenes. From this mixture, para-xylene is extracted for further upgrading to polyethylene terephthalate, a commodity polyester which has a demand in excess of 80 million tonnes/year. Addressed within this review is the catalytic fast pyrolysis, catalysts examined, process chemistry, challenges, and investigation of solutions.

show abstract

“…One of the methods for the selective increase of HZSM-5 activity in fast pyrolysis of lignocellulosic biomass consists of the modification of its structure by the addition of various dopants. Persson et al [14] demonstrated that introduction of selected transition metals (i.e., Fe or Ni) to the zeolite structure resulted in a noticeable increase in the contribution of monoaromatic hydrocarbons or naphthalenes in the bio-oil produced from softwood sawdust. Unfortunately, the presence of a metallic phase led to the more intense formation of coke whose amount increased from 3.5% to 7.2% in the case of parent and Fe-modified zeolite, respectively.…”

Section: Formation Of Coke Depositmentioning

confidence: 99%

“…They can also increase the contribution of aromatics, limit water formation, and promote hydrogen transfer and reforming reactions. However, due to the high activity, they might decrease the liquid fraction due to the formation of gases [14]. Moreover, oxides of different chemical character are also often used as catalysts for this process.…”

Section: Introductionmentioning

confidence: 99%

Catalyst Stability—Bottleneck of Efficient Catalytic Pyrolysis

Grams

Ruppert

2021

Catalysts

View full text Add to dashboard Cite

The pyrolysis of lignocellulosic biomass is one of the most promising methods of alternative fuels production. However, due to the low selectivity of this process, the quality of the obtained bio-oil is usually not satisfactory and does not allow for its direct use as an engine fuel. Therefore, there is a need to apply catalysts able to upgrade the composition of the mixture of pyrolysis products. Unfortunately, despite the increase in the efficiency of the thermal decomposition of biomass, the catalysts undergo relatively fast deactivation and their stability can be considered a bottleneck of efficient pyrolysis of lignocellulosic feedstock. Therefore, solving the problem of catalyst stability is extremely important. Taking that into account, we presented, in this review, the most important reasons for catalyst deactivation, including coke formation, sintering, hydrothermal instability, and catalyst poisoning. Moreover, we discussed the progress in the development of methods leading to an increase in the stability of the catalysts of lignocellulosic biomass pyrolysis and strengthening their resistance to deactivation.

show abstract

Catalytic pyrolysis over transition metal-modified zeolites: A comparative study between catalyst activity and deactivation

Cited by 87 publications

References 48 publications

Selective conversion of furans to p‐xylene with surface‐modified zeolites

Selective conversion of furans to p‐xylene with surface‐modified zeolites

Catalytic Fast Pyrolysis of Lignocellulosic Biomass to Benzene, Toluene, and Xylenes

Catalyst Stability—Bottleneck of Efficient Catalytic Pyrolysis

Contact Info

Product

Resources

About