http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Rafał Janus (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Rafał Janus,Mariusz Wa˛drzyk,Marek Lewandowski,Piotr Natka nski,Piotr Ła˛tka,Piotr Ku strowski 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
A series of mesoporous silicas with bimodal porosity combining the features of broad-mesoporousSBA-15 and narrow-mesoporous MCM-41 was synthesized by the pseudomorphic transformation ofSBA-15. The pore size of the MCM-41-like fraction was adjusted using different quaternary ammoniumsalts, while the degree of pseudomorphic transformation was tuned by the alkalinity of the mother-silicadissolving agent. The produced silicas were applied as hard templates for the synthesis of carbon replicasby nanocasting. The mechanism of pseudomorphic transformation of mesoporous silica was for thefirsttime investigated non-directly, employing the strategy of inverse carbon nanoreplication followed bycomprehensive study of the textural and structural parameters of replicas with regard to silica matrices. It was found that the conversion of SBA-15 into MCM-41 occurs simultaneously throughout the entireparticle’s body according to the mechanism of homogeneous pseudomorphic transformation. It wasevidenced that the strategy of inverse carbon replication could be successfully employed as an ingenioustool for non-direct investigation of suchlike silica transformations towards hierarchical porous systems. Furthermore, the unique bimodal mesoporosity of the carbons obtained from SBA-15 partiallytransformed into MCM-41 opens a possibility for their application in a variety of purposes, mainly incatalysis and adsorption.
-
Rafał Janus,Mariusz Wa˛drzyk,Piotr Natka nski,Pegie Cool,Piotr Ku strowski 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
Three series of mesoporous adsorbents designed for removal of methyl ethyl ketone vapor (MEK) weresynthesized: MCM-41 was decorated with various amounts of novolac resin (Nov) and polyacrylonitrile(PAN), while SBA-15 was modified with PAN. The composites were thermally activated towards anenhancement of MEK adsorption capacity and tested in afixed bed adsorber. Structural features of parentsilicas were investigated by XRD, while textural parameters of the composites were studied by low-temperature nitrogen adsorption. A surface composition was examined by DRIFT and XPS. It was foundthat decoration of the silica surface with small amounts of PAN improved the monolayer adsorptioncapacity. The MEK breakthrough curves and desorption profiles were employed for calculation of themonolayer capacity and total pore volume (VtotalMEK). The VtotalMEK for the materials with smaller pores(MCM-41) were comparable to those determined by nitrogen adsorption, whereas respective values forthe solids with larger pores (SBA-15) were underestimated. The mechanism of adsorption of MEK ontothe adsorbents was elucidated. The MEK molecules were adsorbed solely in the form of keto tautomer. The enhanced MEK adsorption capacity came from the beneficial textural features of the support and thepresence of a ladder-type PAN structure containing O-groups.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
