Catalyst-modified perovskite hollow fiber membrane for oxidative coupling of methane

The catalytic oxidative cou pling of methane(OCM)to C_(2) hydrocarbons(C_(2)H_(6) and C_(2)H_(4))represents one of the most effective ways to convert natural gas to more useful products,which can be performed effectively using La_(0.6)Sr0.4Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)perovskite hollow fiber membrane microreactor.In this work,the effects of adding a thin BaCe_(0.8)Gd_(0.2)O_(3-δ)(BCG)catalyst film onto the inner LSCF fiber surface as the OCM catalyst and a porous Ba0.5Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(BSCF)perovskite layer onto the outer LSCF surface to improve the oxygen permeation were evaluated.Between 700℃and 1000℃,methane conversion increased in the order of uncoated,BCG and BSCF-coated,and BCG-coated LSCF hollow fiber while Coselectivity and C_(2)-yield increased in the order of BCG and BSCF-coated,uncoated,and BCG-coated LSCF hollow fiber.Oxygen permeation flux at the same temperature range,on the other hand,was enhanced in the order of uncoated,BCG-coated,and BCG and BSCF-coated LSCF hollow fiber.This finding demonstrates the complex interplay between oxygen permeation and OCM performance.The BCG and BSCFcoated hollow fiber was also subjected to thermal cycles between 850℃and 900℃for up to 175 hours during which the fiber showed minor degradation in oxygen permeation fluxes and relatively stable OCM performance.

Bio-oil production from pyrolysis of oil palm biomass and the upgrading technologies:A review

Oil palm biomass(OPB)represents major portion of the lignocellulosic waste in Malaysia that can be converted into bio-oil.This review aims to provide important insights in OPB-derived bio-oil production by first discussing the chemical compositions of different OPB and their effects to the bio-oil yield and quality obtained from pyrolysis process,followed by discussing the addition of plastics and catalysts into the pyrolysis for bio-oil upgrading,and lastly summarizing the existing technoeconomic and environmental studies and the potential use of process integration and intensification in this topic.Polypropene(PP),low density polyethylene(LDPE),and high density polyethylene(HDPE)have been commonly used in co-pyrolysis of OPB,which can effectively increase the heating value of bio-oil up to 80%that of diesel.Likewise,acidic,basic,and neutral catalysts have been applied to increase the amount of hydrocarbon and phenol in the bio-oil,further improving the heating value to be comparable to diesel.The bio-oil production from OPB is currently still limited to demonstration scale despite the favorable environmental compatibility and technoeconomic feasibility shown by studies focused on empty fruit bunch(EFB).Several promising advanced pyrolysis processes that integrate other processes such as anaerobic digestion,hydrogen production process,and heat and power generation units as well as the advanced reactor designs are also overviewed here as future innovation of the bio-oil production from OPB,which may play more significant role as the technology matures.

Super Voice Girls

XX/XX/XX, Primary election of Changsha Section...XX/XX/XX, Primary election of Hangzhou Section...XX/XX/XX, Semi-finalsXX/XX/XX, FinalsYou must be very familiar with the schedule above, if only, you spend some time in front of computers or TV sets. Yes, this is the schedule of a singing competition known as"Chao Nu"-"Super Voice Girls". Attention please, not"Super Girls"here.