Enhancing the Production of Light Olefins from Wheat Straw with Modified HZSM-5 Catalytic Pyrolysis

Abstract

Light olefins are the key and basic feedstock of the organic chemical industry. In this study, the effects of Ce-, Mg-, Fe-, and P-modified HZSM-5 on the formation of light olefins from the ex situ catalytic fast pyrolysis of wheat straw were explored in a fixed-bed reactor. Catalysts containing 1, 3, and 5 wt % modifiers were prepared by the equal volume impregnation method and characterized by surface area and porosity analyzer, X-ray diffractometer, and NH3 temperature-programmed desorption analytical instruments. The promotion effect on the yield of light olefins of modified HZSM-5 follows the decreasing order of Ce, Mg, P, and Fe. Moreover, with the increase in loading amount, the yield of light olefins was increased sharply by Ce/ZSM-5, and it was increased slightly or negligibly by P/ZSM-5 or Mg/ZSM-5, whereas it was decreased by Fe/ZSM-5. Overall, the highest yield of light olefins was achieved for 9.18 C-mol % at 5 wt % Ce loading, which could be due to its high total acid amount and smaller average pore size.

Biomass Catalytic Pyrolysis over Zeolite Catalysts with an Emphasis on Porosity and Acidity: A State-of-the-Art Review

“…Compared with traditional zeolite, its deoxidation capacity has increased by a factor of 2.2. Shao and co-workers proved that the first three HZSM-5 modified by Ce, Mg, P, and Fe have very high olefin selectivity. Especially, 2.5 wt % Ce-doped ZSM-5 zeolite has the highest yield, because of its smaller pores and larger acid amounts.…”

Virtual Special Issue of 7th Sino-Australian Symposium on Advanced Coal and Biomass Utilisation Technologies

“…Shao et al. (10.1021/acs.energyfuels.9b02945) enhance the production of light olefins during ex situ catalytic pyrolysis of wheat straw using modified HZSM-5 catalysts. Zhao et al (10.1021/acs.energyfuels.9b02863) compare the dehydration of six kinds of disaccharides and polysaccharides to produce 5-hydroxymethylfurfural using a sulfonated ionic liquid catalyst in a renewable butanone–water solvent mixture.…”

“…Fletcher (10.1021/acs.energyfuels.9b02826) 8 15 hydrotreat the blends of the lignin-rich fraction of bio-oil and vegetable oil to identify suitable co-processing conditions for the production of liquid transport biofuels. Shao et al (10.1021/acs.energyfuels.9b02945) 16 enhance the production of light olefins during ex situ catalytic pyrolysis of wheat straw using modified HZSM-5 catalysts. Zhao et al (10.1021/acs.energyfuels.9b02863) 17 compare the dehydration of six kinds of disaccharides and polysaccharides to produce 5-hydroxymethylfurfural using a sulfonated ionic liquid catalyst in a renewable butanone−water solvent mixture.…”

Sustainable Production of Emerging Diesel Additive from Butene by Palladium-Catalyzed Alkoxycarbonylation

“…On the other hand, butenes are one of the byproducts of the stream cracking of naphtha. − With the development of coal to olefin, as well as the petroleum refining and chemical integration process, the productivity of butenes has been greatly improved, which is approximately 132 million tons per year by 2017 and grows at approximately 4% annually . Besides, butenes can be produced from the catalytic pyrolysis of biomass. − In view of the potential of pentanoic esters fuel and the rich source of butenes, we herein proposed a direct and 100% atom-economic route to produce linear and branched pentanoic esters via one-step alkoxycarbonylation of 1-butene (route b, Figure ), under considerable mild reaction conditions (lower temperature and gas pressure) if compared with the route a. Carbonylation is an effective strategy for the preparation of oxygenated compounds and carbon chain growth. − Some active Pd/phosphine catalysts for alkoxycarbonylation of olefins has been developed using phosphines as the ligands, − however, these ligands are highly expensive; e.g., the price of the best 1,2-bis(di- t -butylphosphino)- o -xylene is $5600/25 g . Moreover, these alkyl phosphine ligands are highly sensitive to oxygen, which greatly increases the cost during the preparation and preservation processes and thus limits their application potential.…”